Compare commits
15 Commits
Author | SHA1 | Date |
---|---|---|
zhangxinyu | a5590116d2 | 11 months ago |
zhangxinyu | 7a2a0ff5bc | 11 months ago |
zhangxinyu | bef8691ce0 | 12 months ago |
zhangxinyu | a0a0167af0 | 12 months ago |
zhangxinyu | 907d13e263 | 12 months ago |
zhangxinyu | abe0c17661 | 12 months ago |
zhangxinyu | 81f38f58c5 | 12 months ago |
zhangxinyu | d1dc7056a5 | 12 months ago |
zhangxinyu | 2f40dbce77 | 12 months ago |
zhangxinyu | 713571b729 | 12 months ago |
zhangxinyu | 082d65446f | 12 months ago |
zhangxinyu | ca37923488 | 12 months ago |
zhangxinyu | b5bd4bfee7 | 12 months ago |
zhangxinyu | a8bf43b113 | 12 months ago |
zhangxinyu | dedb7e59a3 | 12 months ago |
@ -0,0 +1,18 @@
|
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[package]
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name = "os"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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# 设置release模式下保存调试信息
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[profile.release]
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debug=true
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[dependencies]
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riscv = { git = "https://github.com/rcore-os/riscv", features = ["inline-asm"] }
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lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
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||||
sbi-rt = { version = "0.0.2", features = ["legacy"] }
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buddy_system_allocator = "0.6"
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bitflags = "1.2.1"
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xmas-elf = "0.7.0"
|
@ -0,0 +1,50 @@
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TARGET := riscv64gc-unknown-none-elf
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KERNEL_ENTRY := 0x80200000
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MODE := release
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KERNEL_ELF := target/$(TARGET)/$(MODE)/os
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KERNEL_BIN := $(KERNEL_ELF).bin
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SYMBOL_MAP := target/system.map
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QEMU_CMD_PATH := ../../tools/qemu-system-riscv64
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OBJDUMP := rust-objdump --arch-name=riscv64
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OBJCOPY := rust-objcopy --binary-architecture=riscv64
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RUST_FLAGS := -Clink-arg=-Tsrc/linker.ld # 使用我们自己的链接脚本
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RUST_FLAGS += -Cforce-frame-pointers=yes # 强制编译器生成帧指针
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RUST_FLAGS:=$(strip ${RUST_FLAGS})
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# 编译elf文件
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build_elf: clean
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CARGO_BUILD_RUSTFLAGS="$(RUST_FLAGS)" \
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cargo build --$(MODE) --target=$(TARGET)
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# 导出一个符号表, 供我们查看
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$(SYMBOL_MAP):build_elf
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nm $(KERNEL_ELF) | sort > $(SYMBOL_MAP)
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# 丢弃内核可执行elf文件中的元数据得到内核镜像
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$(KERNEL_BIN): build_elf
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@$(OBJCOPY) $(KERNEL_ELF) --strip-all -O binary $@
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debug:build_elf $(KERNEL_BIN) $(SYMBOL_MAP) kill
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$(QEMU_CMD_PATH) \
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-machine virt \
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-display none \
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-daemonize \
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-bios ../../bootloader/rustsbi-qemu.bin \
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-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY) \
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-s -S
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run:build_elf $(KERNEL_BIN) $(SYMBOL_MAP) kill
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$(QEMU_CMD_PATH) \
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-machine virt \
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-nographic \
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-bios ../../bootloader/rustsbi-qemu.bin \
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-device loader,file=$(KERNEL_BIN),addr=$(KERNEL_ENTRY)
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clean:
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# rm -rf ./target* && rm -rf ./src/link_app.S
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kill:
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-pkill -9 qemu
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|
@ -0,0 +1,83 @@
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use std::fs::{read_dir, File};
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use std::io::{Result, Write};
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fn main() {
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// 主要功能是把用户的应用程序加载到内核中
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println!("cargo:rerun-if-changed=../user/src/");
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println!("cargo:rerun-if-changed={}", TARGET_PATH);
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insert_app_data().unwrap();
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}
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static TARGET_PATH: &str = "../user/target/riscv64gc-unknown-none-elf/release/";
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fn insert_app_data() -> Result<()> {
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let mut f = File::create("src/link_app.S").unwrap();
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let mut apps: Vec<_> = read_dir("../user/src/bin")
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.unwrap()
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.into_iter()
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.map(|dir_entry| {
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let mut name_with_ext = dir_entry.unwrap().file_name().into_string().unwrap();
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name_with_ext.drain(name_with_ext.find('.').unwrap()..name_with_ext.len());
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name_with_ext
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})
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.collect();
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apps.sort();
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///
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/// .align 3 表示接下来的数据或代码 使用2^3 8字节对齐
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/// .section .data 下面属于data段
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/// .global _num_app 定义一个全局符号 _num_app
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/// _num_app: _num_app的位置的数据
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/// .quad 5 用来当做matedata 8字节的整数 表示有5个元素
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/// .quad app_0_start 依次存储每个app的开始的位置
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/// .quad app_1_start
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/// .quad app_2_start
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/// .quad app_3_start
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/// .quad app_4_start
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/// .quad app_4_end
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writeln!(
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f,
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r#"
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.align 3
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.section .data
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.global _num_app
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_num_app:
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.quad {}"#,
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apps.len()
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)?;
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for i in 0..apps.len() {
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writeln!(f, r#" .quad app_{}_start"#, i)?;
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}
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writeln!(f, r#" .quad app_{}_end"#, apps.len() - 1)?;
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// app的名字列表
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writeln!(
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f,
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r#"
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.global _app_names
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_app_names:"#
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)?;
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for app in apps.iter() {
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writeln!(f, r#" .string "{}""#, app)?;
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}
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for (idx, app) in apps.iter().enumerate() {
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println!("app_{}: {}", idx, app);
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writeln!(
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f,
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r#"
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.section .data
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.global app_{0}_start
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.global app_{0}_end
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.align 3
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app_{0}_start:
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.incbin "{2}{1}"
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app_{0}_end:"#,
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idx, app, TARGET_PATH
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)?;
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}
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Ok(())
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}
|
@ -0,0 +1,3 @@
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//! Constants used in rCore for qemu
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pub const CLOCK_FREQ: usize = 12500000;
|
@ -0,0 +1,13 @@
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pub const MAX_APP_NUM: usize = 10; // 支持最大的用户应用数量
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pub const KERNEL_HEAP_SIZE: usize = 0x30_0000; // 内核的堆大小 3M
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pub const PAGE_SIZE_BITS: usize = 0xc; // 页内偏移的位宽(也就是每页的大小)
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pub const PAGE_SIZE: usize = 0x1000; // 每个页 的字节大小为 4kb
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pub const MEMORY_END: usize = 0x81000000; // 设置我们当前操作系统最大只能用到 0x80800000-0x80000000大小的内存也就是8M
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pub const USER_STACK_SIZE: usize = 4096 * 2; // 每个应用用户态的栈大小为8kb
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pub const KERNEL_STACK_SIZE: usize = 4096 * 2; // 每个应用的内核栈
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pub const TRAMPOLINE: usize = usize::MAX - PAGE_SIZE + 1; // __alltraps对齐到了这里, (内核空间和用户空间这里虚拟地址都用这个)虚拟地址最高页 存放跳板, 跳板那一页, 被映射到 strampoline段(trap) 实际的物理地址, 即陷入时 cpu需要跳转的地址
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pub const TRAP_CONTEXT: usize = TRAMPOLINE - PAGE_SIZE; // 用户 trap context开始的位置 在 每个用户程序 它本身地址空间 的次高页
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pub use crate::board::*;
|
@ -0,0 +1,15 @@
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.section .text.entry
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.globl _start // 声明_start是全局符号
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_start:
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la sp, boot_stack_top_bound
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call rust_main
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||||
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||||
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||||
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// 声明栈空间 后续 .bss.stack 会被link脚本链接到 .bss段
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.section .bss.stack
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.globl boot_stack_lower_bound // 栈低地址公开为全局符号
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||||
.globl boot_stack_top_bound // 栈高地址公开为全局符号
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boot_stack_lower_bound:
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.space 4096 * 16
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boot_stack_top_bound:
|
@ -0,0 +1,2 @@
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pub mod panic;
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pub mod console;
|
@ -0,0 +1,33 @@
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use crate::sbi::console_put_char;
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||||
use core::fmt::{self, Write};
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||||
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struct Stdout;
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|
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impl Write for Stdout{
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fn write_str(&mut self, s: &str) -> fmt::Result {
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||||
for c in s.chars() {
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||||
console_put_char(c as usize);
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||||
}
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||||
Ok(())
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||||
}
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||||
}
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||||
|
||||
// 用函数包装一下, 表示传进来的参数满足Arguments trait, 然后供宏调用
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||||
pub fn print(args: fmt::Arguments) {
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||||
Stdout.write_fmt(args).unwrap();
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||||
}
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||||
#[macro_export] // 导入这个文件即可使用这些宏
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||||
macro_rules! print {
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||||
($fmt: literal $(, $($arg: tt)+)?) => {
|
||||
$crate::console::print(format_args!($fmt $(, $($arg)+)?));
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||||
}
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||||
}
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||||
|
||||
#[macro_export]
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||||
macro_rules! println {
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||||
($fmt: literal $(, $($arg: tt)+)?) => {
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||||
$crate::console::print(format_args!(concat!($fmt, "\n") $(, $($arg)+)?));
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||||
}
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||||
}
|
@ -0,0 +1,18 @@
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use core::panic::PanicInfo;
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use crate::println;
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||||
use crate::sbi::shutdown;
|
||||
|
||||
#[panic_handler]
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||||
fn panic(info: &PanicInfo) -> ! {
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||||
if let Some(location) = info.location() {
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||||
println!(
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||||
"Panicked at {}:{} {}",
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||||
location.file(),
|
||||
location.line(),
|
||||
info.message().unwrap()
|
||||
);
|
||||
} else {
|
||||
println!("Panicked: {}", info.message().unwrap());
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||||
}
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||||
shutdown();
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}
|
@ -0,0 +1,53 @@
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OUTPUT_ARCH(riscv) /* 目标平台 */
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||||
ENTRY(_start) /* 设置程序入口点为entry.asm中定义的全局符号 */
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||||
BASE_ADDRESS = 0x80200000; /* 一个常量, 我们的kernel将来加载到这个物理地址 */
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|
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SECTIONS
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{
|
||||
. = BASE_ADDRESS; /* 我们对 . 进行赋值, 调整接下来的段的开始位置放在我们定义的常量出 */
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/* skernel = .;*/
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||||
|
||||
stext = .; /* .text段的开始位置 */
|
||||
.text : { /* 表示生成一个为 .text的段, 花括号内按照防止顺序表示将输入文件中的哪些段放在 当前.text段中 */
|
||||
*(.text.entry) /* entry.asm中, 我们自己定义的.text.entry段, 被放在顶部*/
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. = ALIGN(4K); /*4k对齐*/
|
||||
strampoline = .;
|
||||
/* strampoline 段, 将来会被 memory set 导入, 当做跳板最高页vpn的实际物理帧 ppn*/
|
||||
*(.text.trampoline);
|
||||
*(.text .text.*)
|
||||
}
|
||||
|
||||
. = ALIGN(4K);
|
||||
etext = .;
|
||||
srodata = .;
|
||||
.rodata : {
|
||||
*(.rodata .rodata.*)
|
||||
*(.srodata .srodata.*)
|
||||
}
|
||||
|
||||
. = ALIGN(4K);
|
||||
erodata = .;
|
||||
sdata = .;
|
||||
.data : {
|
||||
*(.data .data.*)
|
||||
*(.sdata .sdata.*)
|
||||
}
|
||||
|
||||
. = ALIGN(4K);
|
||||
edata = .;
|
||||
sbss_with_stack = .;
|
||||
.bss : {
|
||||
*(.bss.stack) /* 全局符号 sbss 和 ebss 分别指向 .bss 段除 .bss.stack 以外的起始和终止地址(.bss.stack是我们在entry.asm中定义的栈) */
|
||||
sbss = .;
|
||||
*(.bss .bss.*)
|
||||
*(.sbss .sbss.*)
|
||||
}
|
||||
|
||||
. = ALIGN(4K);
|
||||
ebss = .;
|
||||
ekernel = .;
|
||||
|
||||
/DISCARD/ : {
|
||||
*(.eh_frame)
|
||||
}
|
||||
}
|
@ -0,0 +1,85 @@
|
||||
use alloc::vec::Vec;
|
||||
use core::arch::asm;
|
||||
use lazy_static::lazy_static;
|
||||
|
||||
use crate::config::*;
|
||||
use crate::*;
|
||||
use crate::trap::TrapContext;
|
||||
|
||||
static KERNEL_STACK: [[u8; KERNEL_STACK_SIZE]; MAX_APP_NUM] = [[0; KERNEL_STACK_SIZE]; MAX_APP_NUM]; // 这一章, 每个用户应用对应一个内核栈 [每个应用自己的内核栈; 总应用数]
|
||||
static USER_STACK: [[u8; USER_STACK_SIZE]; MAX_APP_NUM] = [[0; USER_STACK_SIZE]; MAX_APP_NUM]; // 这一行每个用户应用对应一个应用栈
|
||||
|
||||
extern "C" {
|
||||
fn _num_app();
|
||||
fn _app_names();
|
||||
}
|
||||
|
||||
// 得到用户app的数量
|
||||
pub fn get_num_app() -> usize{
|
||||
unsafe{
|
||||
(_num_app as usize as *const usize).read_volatile()
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get_app_data(app_id: usize) -> &'static [u8] {
|
||||
extern "C" {
|
||||
fn _num_app();
|
||||
}
|
||||
let num_app_ptr = _num_app as usize as *const usize;
|
||||
let num_app = get_num_app();
|
||||
let app_start = unsafe { core::slice::from_raw_parts(num_app_ptr.add(1), num_app + 1) };
|
||||
assert!(app_id < num_app);
|
||||
unsafe {
|
||||
core::slice::from_raw_parts(
|
||||
app_start[app_id] as *const u8,
|
||||
app_start[app_id + 1] - app_start[app_id],
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
lazy_static!{
|
||||
static ref APP_NAMES:Vec<&'static str> = {
|
||||
// app总数
|
||||
let num_app = get_num_app();
|
||||
|
||||
// 名字开始的位置
|
||||
let mut start = _app_names as usize as *const u8;
|
||||
|
||||
// 找到每个用户名
|
||||
let mut app_names = Vec::new();
|
||||
unsafe {
|
||||
for _ in 0..num_app {
|
||||
let mut end = start;
|
||||
while end.read_volatile() != b'\0'{
|
||||
end = end.add(1)
|
||||
}
|
||||
|
||||
// 从start 到 end长度的切片
|
||||
let slice = core::slice::from_raw_parts(start, end as usize - start as usize);
|
||||
|
||||
let str = core::str::from_utf8(slice).unwrap();
|
||||
app_names.push(str);
|
||||
start = end.add(1)
|
||||
};
|
||||
}
|
||||
app_names
|
||||
};
|
||||
}
|
||||
|
||||
|
||||
/// 根据app的名字 找到app的下标, 然后找到app的二进制elf数据
|
||||
pub fn get_app_data_by_name(name: &str) -> Option<&'static [u8]> {
|
||||
let num_app = get_num_app();
|
||||
(0..num_app)
|
||||
.find(|&i| APP_NAMES[i] == name)
|
||||
.map(get_app_data)
|
||||
}
|
||||
|
||||
/// 输出所有的app的名字
|
||||
pub fn list_apps() {
|
||||
println!("/**** APPS ****");
|
||||
for app in APP_NAMES.iter() {
|
||||
println!("{}", app);
|
||||
}
|
||||
println!("**************/");
|
||||
}
|
@ -0,0 +1,88 @@
|
||||
#![feature(panic_info_message)]
|
||||
#![feature(alloc_error_handler)]
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
extern crate alloc;
|
||||
|
||||
use core::arch::global_asm;
|
||||
use sbi::{console_put_char, shutdown};
|
||||
use lang_items::console;
|
||||
|
||||
pub mod lang_items;
|
||||
pub mod sbi;
|
||||
pub mod sync;
|
||||
pub mod trap;
|
||||
pub mod syscall;
|
||||
pub mod loader;
|
||||
pub mod config;
|
||||
pub mod task;
|
||||
pub mod timer;
|
||||
pub mod mm;
|
||||
|
||||
#[path = "boards/qemu.rs"]
|
||||
mod board;
|
||||
|
||||
static OS_LOGO:&'static str = r#"
|
||||
|
||||
___ ___ ___
|
||||
/ /\ __ / /\ / /\
|
||||
/ /::| | |\ / /::\ / /::\
|
||||
/ /:|:| | |:| / /:/\:\ /__/:/\:\
|
||||
/ /:/|:|__ | |:| / /:/ \:\ _\_ \:\ \:\
|
||||
/__/:/_|::::\ |__|:|__ /__/:/ \__\:\ /__/\ \:\ \:\
|
||||
\__\/ /~~/:/ / /::::\ \ \:\ / /:/ \ \:\ \:\_\/
|
||||
/ /:/ / /:/~~~~ \ \:\ /:/ \ \:\_\:\
|
||||
/ /:/ /__/:/ \ \:\/:/ \ \:\/:/
|
||||
/__/:/ \__\/ \ \::/ \ \::/
|
||||
\__\/ \__\/ \__\/
|
||||
|
||||
"#;
|
||||
|
||||
|
||||
|
||||
// 汇编脚本引入, 调整内核的内存布局之后, 会跳入到 rust_main中执行
|
||||
global_asm!(include_str!("entry.asm"));
|
||||
|
||||
// 引入用户的二进制文件
|
||||
global_asm!(include_str!("link_app.S"));
|
||||
|
||||
extern "C" {
|
||||
fn stext();
|
||||
fn etext();
|
||||
fn sbss();
|
||||
fn ebss();
|
||||
fn boot_stack_top_bound();
|
||||
fn boot_stack_lower_bound();
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub fn rust_main(){
|
||||
init_bss();
|
||||
|
||||
println!("stext: {:#x}, etext: {:#x}", stext as usize, etext as usize);
|
||||
println!("sbss: {:#x}, ebss: {:#x}", sbss as usize, ebss as usize);
|
||||
println!("boot_stack_top_bound: {:#x}, boot_stack_lower_bound: {:#x}", boot_stack_top_bound as usize, boot_stack_lower_bound as usize);
|
||||
|
||||
// 初始化动态内存分配器, 使我们能在内核中使用动态大小数据类型
|
||||
mm::init();
|
||||
|
||||
|
||||
trap::init();
|
||||
trap::enable_timer_interrupt(); // 允许定时器中断
|
||||
timer::set_next_trigger(); // 在进入用户态之前, 设置一个时钟中断, 防止第一个用户任务死循环
|
||||
task::add_initproc();
|
||||
|
||||
println!("{}", OS_LOGO);
|
||||
loader::list_apps();
|
||||
task::run_tasks();
|
||||
panic!("Disable run here")
|
||||
}
|
||||
|
||||
/// ## 初始化bss段
|
||||
///
|
||||
fn init_bss() {
|
||||
unsafe {
|
||||
(sbss as usize..ebss as usize).for_each(|p| (p as *mut u8).write_unaligned(0))
|
||||
}
|
||||
}
|
@ -0,0 +1,207 @@
|
||||
use crate::config::{PAGE_SIZE, PAGE_SIZE_BITS};
|
||||
use crate::mm::page_table::PageTableEntry;
|
||||
|
||||
const PA_WIDTH_SV39: usize = 56; // 真实物理地址 的字节宽度 44(物理页宽) + 12(4kb的宽度)
|
||||
const VA_WIDTH_SV39: usize = 39; // 虚拟地址的宽度 9 + 9 + 9 + 12
|
||||
const PPN_WIDTH_SV39: usize = PA_WIDTH_SV39 - PAGE_SIZE_BITS; // 物理页 的宽度, 也就是 物理地址宽度-每页宽度=物理页宽度
|
||||
const VPN_WIDTH_SV39: usize = VA_WIDTH_SV39 - PAGE_SIZE_BITS; // 虚拟页的宽度 27
|
||||
|
||||
|
||||
// 物理地址 56bit 44 12
|
||||
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
|
||||
pub struct PhysAddr(pub usize);
|
||||
|
||||
// 虚拟地址 39bit 9 9 9 12
|
||||
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
|
||||
pub struct VirtAddr(pub usize);
|
||||
|
||||
// 物理页 44bit
|
||||
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
|
||||
pub struct PhysPageNum(pub usize);
|
||||
|
||||
// 虚拟页 29bit 布局为 9 9 9
|
||||
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
|
||||
pub struct VirtPageNum(pub usize);
|
||||
|
||||
|
||||
// 把usize 转为真实地址(只保留 PA_WIDTH_SV39 位字节)
|
||||
impl From<usize> for PhysAddr {
|
||||
fn from(v: usize) -> Self {
|
||||
Self(v & ( (1 << PA_WIDTH_SV39) - 1 ))
|
||||
}
|
||||
}
|
||||
|
||||
// 把usize类型的物理页号 转为物理页结构体 (只保留物理页的宽度)
|
||||
impl From<usize> for PhysPageNum {
|
||||
fn from(v: usize) -> Self {
|
||||
Self(v & ( (1 << PPN_WIDTH_SV39) - 1 ))
|
||||
}
|
||||
}
|
||||
|
||||
// 把物理地址转为 usize, 直接返回即可
|
||||
impl From<PhysAddr> for usize {
|
||||
fn from(v: PhysAddr) -> Self {
|
||||
v.0
|
||||
}
|
||||
}
|
||||
|
||||
// 把物理页结构体转为 usize类型的物理页 直接返回即可
|
||||
impl From<PhysPageNum> for usize {
|
||||
fn from(v: PhysPageNum) -> Self {
|
||||
v.0
|
||||
}
|
||||
}
|
||||
|
||||
// 把PhysAddr 转为 PhysPageNum
|
||||
impl From<PhysAddr> for PhysPageNum {
|
||||
fn from(v: PhysAddr) -> Self {
|
||||
assert_eq!(v.page_offset(), 0);
|
||||
v.floor()
|
||||
}
|
||||
}
|
||||
|
||||
// 把物理页转为物理地址(左移页宽即可)
|
||||
impl From<PhysPageNum> for PhysAddr {
|
||||
fn from(v: PhysPageNum) -> Self { Self(v.0 << PAGE_SIZE_BITS) }
|
||||
}
|
||||
|
||||
impl PhysAddr {
|
||||
// 从当前物理地址得到页内偏移(只保留12个bit即可)
|
||||
pub fn page_offset(&self) -> usize {
|
||||
self.0 & (PAGE_SIZE - 1)
|
||||
}
|
||||
|
||||
// 舍去小数位, 把物理地址, 转为 物理页号 向下取整
|
||||
pub fn floor(&self) -> PhysPageNum {
|
||||
PhysPageNum(self.0 / PAGE_SIZE)
|
||||
}
|
||||
|
||||
// 有小数统一 +1, 物理地址转为物理页号 向上取整
|
||||
pub fn ceil(&self) -> PhysPageNum {
|
||||
PhysPageNum((self.0 + PAGE_SIZE - 1) / PAGE_SIZE)
|
||||
}
|
||||
|
||||
// 把当前虚拟地址映射为指定类型T
|
||||
pub fn get_mut<T>(&self) -> &'static mut T {
|
||||
unsafe { (self.0 as *mut T).as_mut().unwrap() }
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
impl PhysPageNum {
|
||||
// // 从当前物理页保存的数据中得到所有的 PTE
|
||||
pub fn get_pte_array(&self) -> &'static mut [PageTableEntry] {
|
||||
// 物理页号 转为物理地址
|
||||
let pa: PhysAddr = (*self).into();
|
||||
// 从物理页地址读出一页 512个8字节(4k)的数据
|
||||
unsafe { core::slice::from_raw_parts_mut(pa.0 as *mut PageTableEntry, 512) }
|
||||
}
|
||||
|
||||
// 从当前物理页得到 引用类型的 byte array
|
||||
pub fn get_bytes_array(&self) -> &'static mut [u8] {
|
||||
let pa: PhysAddr = (*self).into();
|
||||
unsafe { core::slice::from_raw_parts_mut(pa.0 as *mut u8, 4096) }
|
||||
}
|
||||
|
||||
// 把物理页转为物理地址之后, 再转为T, 强转
|
||||
pub fn get_mut<T>(&self) -> &'static mut T {
|
||||
let pa: PhysAddr = (*self).into();
|
||||
unsafe { (pa.0 as *mut T).as_mut().unwrap() }
|
||||
}
|
||||
}
|
||||
|
||||
impl VirtAddr{
|
||||
// 舍去小数位, 把虚拟地址转为物理页号 向下取整
|
||||
pub fn floor(&self) -> VirtPageNum {
|
||||
VirtPageNum(self.0 / PAGE_SIZE)
|
||||
}
|
||||
|
||||
// 有小数统一+1 虚拟地址转为虚拟页号 向上取整
|
||||
pub fn ceil(&self) -> VirtPageNum {
|
||||
VirtPageNum((self.0 - 1 + PAGE_SIZE) / PAGE_SIZE)
|
||||
}
|
||||
|
||||
// 虚拟地址得到业内偏移 只保留12个bit即可
|
||||
pub fn page_offset(&self) -> usize {
|
||||
self.0 & (PAGE_SIZE - 1)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 把usize 转为 虚拟地址, 只保留39位
|
||||
impl From<usize> for VirtAddr {
|
||||
fn from(value: usize) -> Self {
|
||||
Self(value & ((1 << VA_WIDTH_SV39) - 1))
|
||||
}
|
||||
}
|
||||
|
||||
// 把虚拟地址, 转为usize
|
||||
impl From<VirtAddr> for usize {
|
||||
fn from(v: VirtAddr) -> Self {
|
||||
if v.0 >= (1 << (VA_WIDTH_SV39 - 1)) {
|
||||
// 将高位全部设置为1, 虚拟地址就是这样的, 64~39 位, 随着38位变化
|
||||
v.0 | (!((1 << VA_WIDTH_SV39) - 1))
|
||||
} else {
|
||||
v.0
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 把usize类型的页号 转为 虚拟页号结构体, 只保留27位即可
|
||||
impl From<usize> for VirtPageNum {
|
||||
fn from(v: usize) -> Self {
|
||||
Self(v & ((1 << VPN_WIDTH_SV39) - 1))
|
||||
}
|
||||
}
|
||||
|
||||
// 虚拟地址 转为虚拟页号 向下取整
|
||||
impl From<VirtAddr> for VirtPageNum {
|
||||
fn from(v: VirtAddr) -> Self {
|
||||
assert_eq!(v.page_offset(), 0);
|
||||
v.floor()
|
||||
}
|
||||
}
|
||||
|
||||
// 虚拟页号 转为虚拟地址 左移即可
|
||||
impl From<VirtPageNum> for VirtAddr {
|
||||
fn from(v: VirtPageNum) -> Self {
|
||||
// 左移12位
|
||||
Self(v.0 << PAGE_SIZE_BITS)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
impl VirtPageNum{
|
||||
// 从虚拟页号中 抽离 9 9 9 的布局
|
||||
pub fn indexes(&self) -> [usize; 3] {
|
||||
let mut vpn = self.0;
|
||||
let mut idx = [0usize; 3];
|
||||
for i in (0..3).rev() {
|
||||
idx[i] = vpn & 511;
|
||||
vpn >>= 9;
|
||||
}
|
||||
idx
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 代表一个range类型, 表示一段 虚拟地址 的区间
|
||||
#[derive(Copy, Clone)]
|
||||
pub struct VPNRange {
|
||||
pub l: VirtPageNum,
|
||||
pub r: VirtPageNum
|
||||
}
|
||||
|
||||
impl Iterator for VPNRange {
|
||||
type Item = VirtPageNum;
|
||||
|
||||
fn next(&mut self) -> Option<Self::Item> {
|
||||
if self.l == self.r {
|
||||
None
|
||||
} else {
|
||||
let current_vpn = self.l;
|
||||
self.l = (self.l.0 + 1).into();
|
||||
Some(current_vpn)
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,120 @@
|
||||
use alloc::vec::Vec;
|
||||
use lazy_static::lazy_static;
|
||||
use crate::mm::address::{PhysPageNum, PhysAddr};
|
||||
use crate::config::MEMORY_END;
|
||||
use crate::println;
|
||||
use crate::sync::UPSafeCell;
|
||||
|
||||
extern "C" {
|
||||
fn ekernel();
|
||||
}
|
||||
|
||||
// 物理页帧的结构体, 他和物理页号不同, 它是管理整个物理页内的数据, 而物理页号被页表管理
|
||||
// 这个结构体只是利用rust drop管理变量的方式
|
||||
// 我们使用这个结构体, 来利用rust变量生命周期, 自动管理该页, 数据清零或者还回物理页帧管理器
|
||||
// 这个结构可以省去(因为他很多时候使用PhysPageNum 也可以完成), 但是为了防止后续课程还有其他地方使用, 就不省了,
|
||||
pub struct FrameTracker {
|
||||
pub ppn: PhysPageNum,
|
||||
}
|
||||
|
||||
impl FrameTracker {
|
||||
pub fn new(ppn: PhysPageNum) -> Self {
|
||||
// 页数据初始化
|
||||
let bytes_array = ppn.get_bytes_array();
|
||||
for i in bytes_array {
|
||||
*i = 0;
|
||||
}
|
||||
Self { ppn }
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for FrameTracker {
|
||||
// 生命周期结束, 自动把页还给 物理页帧管理器
|
||||
fn drop(&mut self) {
|
||||
frame_dealloc(self.ppn);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 物理页帧管理器, 它管理了 ekernel(操作系统使用的内存结束位置) 到 MEMORY_END(最大的可用的物理内存地址)所有的内存, 这部分内存是给用户用的
|
||||
// current, end 这个区间表示此前从未被分配过的页
|
||||
// recycled 表示之前被分配过, 但是已经被回收可以再利用的页
|
||||
pub struct StackFrameAllocator {
|
||||
current: PhysPageNum,
|
||||
end: PhysPageNum,
|
||||
recycled: Vec<PhysPageNum>,
|
||||
}
|
||||
|
||||
impl StackFrameAllocator {
|
||||
fn from(l: PhysPageNum, r: PhysPageNum) -> Self {
|
||||
Self {
|
||||
current: l,
|
||||
end: r,
|
||||
recycled: Vec::new(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl StackFrameAllocator {
|
||||
// 从分配器中, 找到一个空闲页(它可能之前从未分配过, 或者之前被分配但是已经被回收的完好页)
|
||||
fn alloc(&mut self) -> Option<PhysPageNum> {
|
||||
if let Some(ppn) = self.recycled.pop() {
|
||||
Some(ppn)
|
||||
} else if self.current == self.end {
|
||||
None
|
||||
} else {
|
||||
let current_ppn = self.current;
|
||||
let next_ppn = (self.current.0 + 1).into();
|
||||
self.current = next_ppn;
|
||||
Some(current_ppn)
|
||||
}
|
||||
}
|
||||
|
||||
// 回收一个页, 为了防止二次回收, 我们这里直接panic
|
||||
fn dealloc(&mut self, ppn: PhysPageNum) {
|
||||
// 防止被二次回收
|
||||
if ppn >= self.current || self.recycled.iter().any(|&v| v == ppn) {
|
||||
panic!("Frame ppn={:#x} has not been allocated!", ppn.0);
|
||||
}
|
||||
// 校验完毕, 把这个页, 还给管理器
|
||||
self.recycled.push(ppn);
|
||||
}
|
||||
}
|
||||
|
||||
lazy_static! {
|
||||
static ref FRAME_ALLOCATOR: UPSafeCell<StackFrameAllocator> = unsafe {
|
||||
// 这里我们只要完整的页, 舍去开头和结尾一些碎片
|
||||
UPSafeCell::new(StackFrameAllocator::from(PhysAddr::from(ekernel as usize).ceil(), PhysAddr::from(MEMORY_END).floor()))
|
||||
};
|
||||
}
|
||||
|
||||
/// 分配一个页
|
||||
pub fn frame_alloc() -> Option<FrameTracker> {
|
||||
FRAME_ALLOCATOR
|
||||
.exclusive_access()
|
||||
.alloc()
|
||||
.map(FrameTracker::new)
|
||||
}
|
||||
|
||||
/// 回收指定的页
|
||||
fn frame_dealloc(ppn: PhysPageNum) {
|
||||
FRAME_ALLOCATOR.exclusive_access().dealloc(ppn);
|
||||
}
|
||||
|
||||
|
||||
pub fn frame_allocator_test() {
|
||||
let mut v: Vec<FrameTracker> = Vec::new();
|
||||
for i in 0..5 {
|
||||
let frame = frame_alloc().unwrap();
|
||||
println!("frame_allocator_test {:?}", frame.ppn.0);
|
||||
v.push(frame);
|
||||
}
|
||||
v.clear();
|
||||
for i in 0..5 {
|
||||
let frame = frame_alloc().unwrap();
|
||||
println!("frame_allocator_test {:?}", frame.ppn.0);
|
||||
v.push(frame);
|
||||
}
|
||||
drop(v);
|
||||
println!("frame_allocator_test passed!");
|
||||
}
|
@ -0,0 +1,67 @@
|
||||
|
||||
use alloc::boxed::Box;
|
||||
use alloc::vec;
|
||||
use buddy_system_allocator::LockedHeap;
|
||||
use crate::config::KERNEL_HEAP_SIZE;
|
||||
use crate::println;
|
||||
|
||||
|
||||
// 动态内存分配器
|
||||
#[global_allocator]
|
||||
static HEAP_ALLOCATOR: LockedHeap = LockedHeap::empty();
|
||||
|
||||
// 内存分配失败时, 会调用此错误处理函数
|
||||
|
||||
// 堆的空间
|
||||
static mut HEAP_SPACE: [u8; KERNEL_HEAP_SIZE] = [0; KERNEL_HEAP_SIZE];
|
||||
|
||||
|
||||
// 为内存分配器, 绑定一个空间用来实现动态内存分配
|
||||
pub fn init_heap() {
|
||||
unsafe {
|
||||
HEAP_ALLOCATOR
|
||||
.lock()
|
||||
.init(HEAP_SPACE.as_ptr() as usize, KERNEL_HEAP_SIZE);
|
||||
}
|
||||
// heap_test()
|
||||
}
|
||||
|
||||
pub fn heap_test() {
|
||||
use alloc::boxed::Box;
|
||||
use alloc::vec::Vec;
|
||||
extern "C" {
|
||||
fn sbss();
|
||||
fn ebss();
|
||||
}
|
||||
let bss_range = sbss as usize..ebss as usize;
|
||||
println!("bss_range {:?}", bss_range);
|
||||
|
||||
let a = Box::new(5);
|
||||
println!("a: {:?} ptr: {:p}", a, a.as_ref());
|
||||
let b = Box::new(6);
|
||||
println!("b: {:?} ptr: {:p}", b, b.as_ref());
|
||||
|
||||
|
||||
unsafe {
|
||||
println!("HEAP_SPACE: {:?}", HEAP_SPACE.as_ptr())
|
||||
}
|
||||
|
||||
let mut v = vec![];
|
||||
for i in 0..500{
|
||||
v.push(i);
|
||||
}
|
||||
|
||||
for i in 0..500{
|
||||
v.pop();
|
||||
}
|
||||
|
||||
println!("{:?}", v);
|
||||
|
||||
// 通过输出打印, 发现 a 和b 均被分配在了 HEAP_SPACE 中, 且 HEAP_SPACE 被分配在了 bss段中, 这个段由我们 linker.ld 进行手动布局
|
||||
// 目前整个bss段的大小都是3M, 说明当前bss段中只有这一个 数据
|
||||
}
|
||||
|
||||
#[alloc_error_handler]
|
||||
pub fn handle_alloc_error(layout: core::alloc::Layout) -> ! {
|
||||
panic!("Heap allocation error, layout = {:?}", layout);
|
||||
}
|
@ -0,0 +1,503 @@
|
||||
use alloc::collections::BTreeMap;
|
||||
use alloc::sync::Arc;
|
||||
use alloc::vec::Vec;
|
||||
use core::arch::asm;
|
||||
use bitflags::bitflags;
|
||||
use lazy_static::lazy_static;
|
||||
use riscv::register::satp;
|
||||
use xmas_elf;
|
||||
use crate::sync::UPSafeCell;
|
||||
use crate::config::{MEMORY_END, PAGE_SIZE, TRAMPOLINE, TRAP_CONTEXT, USER_STACK_SIZE};
|
||||
use crate::mm::address::{PhysAddr, PhysPageNum, VirtAddr, VirtPageNum, VPNRange};
|
||||
use crate::mm::frame_allocator::{frame_alloc, FrameTracker};
|
||||
use crate::mm::page_table::{PageTable, PTEFlags};
|
||||
use crate::println;
|
||||
|
||||
// 引入外部符号进来, 下面映射地址空间的逻辑段会用到
|
||||
extern "C" {
|
||||
fn stext();
|
||||
fn etext();
|
||||
fn srodata();
|
||||
fn erodata();
|
||||
fn sdata();
|
||||
fn edata();
|
||||
fn sbss_with_stack();
|
||||
fn ebss();
|
||||
fn ekernel();
|
||||
fn strampoline(); // 这个符号 在linker.ld 中定义
|
||||
}
|
||||
lazy_static! {
|
||||
/// a memory set instance through lazy_static! managing kernel space
|
||||
pub static ref KERNEL_SPACE: Arc<UPSafeCell<MemorySet>> =
|
||||
Arc::new(unsafe { UPSafeCell::new(MemorySet::new_kernel()) });
|
||||
}
|
||||
|
||||
// 某逻辑段的映射方式
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub enum MapType {
|
||||
Identical, // 恒等映射
|
||||
Framed, // 逻辑映射
|
||||
}
|
||||
|
||||
|
||||
// 这个段的权限, 它是页表项标志位 PTEFlags 的一个子集, 仅仅保留4个标志位就足够了
|
||||
bitflags! {
|
||||
/// map permission corresponding to that in pte: `R W X U`
|
||||
pub struct MapPermission: u8 {
|
||||
const R = 1 << 1;
|
||||
const W = 1 << 2;
|
||||
const X = 1 << 3;
|
||||
const U = 1 << 4;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 代表一个逻辑段
|
||||
pub struct MapArea {
|
||||
vpn_range: VPNRange, // 逻辑段的虚拟页起始位置 和 结束位置
|
||||
data_frames: BTreeMap<VirtPageNum, FrameTracker>, // 这个逻辑段 虚拟页 对应的具体的物理帧, 这里使用rust 进行管理其物理帧的释放, 自动drop进行还给物理页帧管理器
|
||||
map_type: MapType,
|
||||
map_perm: MapPermission,
|
||||
}
|
||||
|
||||
impl MapArea {
|
||||
// 从虚拟地址起始和结束, 创建一个逻辑段结构体
|
||||
pub fn from(start_va: VirtAddr, end_va: VirtAddr, map_type: MapType, map_perm: MapPermission,) -> Self {
|
||||
// 截取抛弃内存碎片
|
||||
let start_vpn: VirtPageNum = start_va.floor();
|
||||
let end_vpn: VirtPageNum = end_va.ceil();
|
||||
|
||||
Self {
|
||||
vpn_range: VPNRange {l:start_vpn, r: end_vpn},
|
||||
data_frames: BTreeMap::new(),
|
||||
map_type,
|
||||
map_perm,
|
||||
}
|
||||
}
|
||||
// 根据当前逻辑段的信息, 创建另一个一样的逻辑段
|
||||
pub fn from_another(another: &Self) -> Self {
|
||||
Self {
|
||||
vpn_range: VPNRange{l:another.vpn_range.l, r:another.vpn_range.r},
|
||||
data_frames: BTreeMap::new(),
|
||||
map_type: another.map_type,
|
||||
map_perm: another.map_perm,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl MapArea {
|
||||
// 把一个虚拟页号 创建一个对应的物理页帧 映射到page_table中, 并把创建的物理页帧生命周期 绑定到 self上
|
||||
pub fn map_one(&mut self, page_table: &mut PageTable, vpn: VirtPageNum) {
|
||||
let ppn: PhysPageNum;
|
||||
match self.map_type {
|
||||
// 恒等映射
|
||||
MapType::Identical => {
|
||||
ppn = PhysPageNum(vpn.0);
|
||||
}
|
||||
MapType::Framed => {
|
||||
// 随便创建一个 物理页帧
|
||||
let frame = frame_alloc().unwrap();
|
||||
ppn = frame.ppn;
|
||||
// 把随便创建的物理页帧, 绑定到data_frames 中被 self管理生命周期
|
||||
self.data_frames.insert(vpn, frame);
|
||||
}
|
||||
}
|
||||
|
||||
// 根据上面创建的物理页帧映射pte 到三级页表中
|
||||
let pte_flags = PTEFlags::from_bits(self.map_perm.bits).unwrap();
|
||||
page_table.map(vpn, ppn, pte_flags);
|
||||
}
|
||||
|
||||
// 取消映射一个vpn, 并把 self管理的 物理页帧的生命周期结束
|
||||
pub fn unmap_one(&mut self, page_table: &mut PageTable, vpn: VirtPageNum) {
|
||||
if self.map_type == MapType::Framed {
|
||||
// 删除映射关系, 自动调用 drop 把vpn对应的ppn还给全局内存管理器
|
||||
self.data_frames.remove(&vpn);
|
||||
}
|
||||
// 物理帧不存在了 把vpn 对应的pte设置为空
|
||||
page_table.unmap(vpn);
|
||||
}
|
||||
|
||||
// 映射 当前逻辑段中的每一个虚拟页, 到页表中
|
||||
pub fn map(&mut self, page_table: &mut PageTable) {
|
||||
|
||||
for vpn in self.vpn_range {
|
||||
self.map_one(page_table, vpn);
|
||||
}
|
||||
}
|
||||
|
||||
// 在页表中取消映射每一个虚拟页
|
||||
pub fn unmap(&mut self, page_table: &mut PageTable) {
|
||||
for vpn in self.vpn_range {
|
||||
self.unmap_one(page_table, vpn);
|
||||
}
|
||||
}
|
||||
|
||||
// 拷贝外部的数据二进制 到当前的逻辑段中 按照页 为单位
|
||||
pub fn copy_data(&mut self, page_table: &mut PageTable, data: &[u8]) {
|
||||
assert_eq!(self.map_type, MapType::Framed);
|
||||
|
||||
let mut start: usize = 0;
|
||||
|
||||
// 当前逻辑段的起始页位置
|
||||
let mut current_vpn = self.vpn_range.l;
|
||||
// 需要拷贝的字节总大小
|
||||
let len = data.len();
|
||||
loop {
|
||||
// 拷贝 每次最大拷贝1个页
|
||||
let src = &data[start..len.min(start + PAGE_SIZE)];
|
||||
|
||||
// 得到逻辑段每个页的起始位置
|
||||
let dst = &mut page_table
|
||||
.get_pte(current_vpn) // 在页表中, 根据逻辑段中的vpn 得到 54bit的pte (44+10)
|
||||
.unwrap()
|
||||
.ppn() // 根据54bit的pte, 得到44bit 的物理页帧的位置
|
||||
.get_bytes_array()[..src.len()]; // 得到物理页帧那一页的起始的地址 44bit<<12
|
||||
dst.copy_from_slice(src);
|
||||
start += PAGE_SIZE;
|
||||
if start >= len {
|
||||
break;
|
||||
}
|
||||
current_vpn = (current_vpn.0 + 1).into();
|
||||
}
|
||||
}
|
||||
// 当前段, 缩小到新的结束位置, 即把new_end后面的页, 都还给物理页帧管理器, 并取消映射(通过unmap_one方法即可)
|
||||
pub fn shrink_to(&mut self, page_table: &mut PageTable, new_end: VirtPageNum) {
|
||||
let tmp_vpn_range = VPNRange{
|
||||
l: new_end,
|
||||
r: self.vpn_range.r,
|
||||
};
|
||||
for vpn in tmp_vpn_range {
|
||||
self.unmap_one(page_table, vpn)
|
||||
}
|
||||
|
||||
// 注意 当前段的区间 也要调整哦new(self.vpn_range.get_start(), new_end);
|
||||
self.vpn_range.r = new_end;
|
||||
}
|
||||
|
||||
|
||||
// 当前段, 把当前结束的位置, 扩展到新的结束的位置
|
||||
pub fn append_to(&mut self, page_table: &mut PageTable, new_end: VirtPageNum) {
|
||||
let tmp_vpn_range = VPNRange{
|
||||
l: self.vpn_range.r,
|
||||
r: new_end,
|
||||
};
|
||||
|
||||
for vpn in tmp_vpn_range {
|
||||
self.map_one(page_table, vpn)
|
||||
}
|
||||
|
||||
self.vpn_range.r = new_end;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 表示一个地址空间, 它是一个页表和 包含所有段信息的页表组成
|
||||
pub struct MemorySet {
|
||||
pub page_table: PageTable,
|
||||
pub areas: Vec<MapArea>,
|
||||
}
|
||||
|
||||
impl MemorySet {
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
page_table: PageTable::new(),
|
||||
areas: Vec::new(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn from_elf(elf_data: &[u8]) -> (Self, usize, usize) {
|
||||
let mut memory_set = Self::new();
|
||||
// map trampoline
|
||||
// 创建一个地址空间
|
||||
memory_set.map_trampoline();
|
||||
// map program headers of elf, with U flag
|
||||
// 分析外部传进来的 elf文件数据
|
||||
let elf = xmas_elf::ElfFile::new(elf_data).unwrap();
|
||||
let elf_header = elf.header;
|
||||
let magic = elf_header.pt1.magic;
|
||||
assert_eq!(magic, [0x7f, 0x45, 0x4c, 0x46], "invalid elf!");
|
||||
let ph_count = elf_header.pt2.ph_count();
|
||||
// 得到所有的段数量
|
||||
let mut max_end_vpn = VirtPageNum(0);
|
||||
// 循环所有的段
|
||||
for i in 0..ph_count {
|
||||
// 得到当前段
|
||||
let ph = elf.program_header(i).unwrap();
|
||||
// 确定有加载的必要
|
||||
if ph.get_type().unwrap() == xmas_elf::program::Type::Load {
|
||||
// 当前段开始位置
|
||||
let start_va: VirtAddr = (ph.virtual_addr() as usize).into();
|
||||
// 当前段结束位置 (开始位置+大小)
|
||||
let end_va: VirtAddr = ((ph.virtual_addr() + ph.mem_size()) as usize).into();
|
||||
|
||||
// 当前段权限
|
||||
let mut map_perm = MapPermission::U;
|
||||
let ph_flags = ph.flags();
|
||||
if ph_flags.is_read() {
|
||||
map_perm |= MapPermission::R;
|
||||
}
|
||||
if ph_flags.is_write() {
|
||||
map_perm |= MapPermission::W;
|
||||
}
|
||||
if ph_flags.is_execute() {
|
||||
map_perm |= MapPermission::X;
|
||||
}
|
||||
// 创建一个 逻辑段
|
||||
let map_area = MapArea::from(start_va, end_va, MapType::Framed, map_perm);
|
||||
// 每次都更新最后的逻辑段的最后结束最大的逻辑地址
|
||||
max_end_vpn = map_area.vpn_range.r;
|
||||
|
||||
// 当前逻辑段, 添加到地址空间, 并copy数据进去
|
||||
memory_set.push(
|
||||
map_area,
|
||||
Some(&elf.input[ph.offset() as usize..(ph.offset() + ph.file_size()) as usize]),
|
||||
);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
// map user stack with U flags
|
||||
// 将最后一个最大的逻辑段的结束的页, 转为逻辑地址 左移12位 得到39位的VirtAddr
|
||||
let max_end_va: VirtAddr = max_end_vpn.into();
|
||||
// 根据riscv 的规则, 转成一个 合法的地址
|
||||
let mut user_stack_bottom: usize = max_end_va.into();
|
||||
|
||||
// guard page 放置 一页 保护页隔离用户栈
|
||||
user_stack_bottom += PAGE_SIZE;
|
||||
|
||||
// 保护页之后 再增加 用户栈大小,得到栈底和当前的栈顶
|
||||
// 此时 user_stack_top 距离 max_end_vpn 三个页
|
||||
let user_stack_top = user_stack_bottom + USER_STACK_SIZE;
|
||||
|
||||
// 添加 用户逻辑栈段并映射物理地址页, 到当前的地址空间
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
user_stack_bottom.into(),
|
||||
user_stack_top.into(),
|
||||
MapType::Framed,
|
||||
MapPermission::R | MapPermission::W | MapPermission::U,
|
||||
),
|
||||
None,
|
||||
);
|
||||
|
||||
// 用户的堆空间段 只有一个起始位置即可, 因为 user_stack_top上面全是堆的空间(除了最后两页)
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
user_stack_top.into(),
|
||||
user_stack_top.into(),
|
||||
MapType::Framed,
|
||||
MapPermission::R | MapPermission::W | MapPermission::U,
|
||||
),
|
||||
None,
|
||||
);
|
||||
|
||||
// 设置 TrapContext为统一的虚拟地址
|
||||
// 将 虚拟地址的 次高页添加到用户空间, 后面会被内核强行找到物理地址并修改为 trap context
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
TRAP_CONTEXT.into(),
|
||||
TRAMPOLINE.into(),
|
||||
MapType::Framed,
|
||||
MapPermission::R | MapPermission::W,
|
||||
),
|
||||
None,
|
||||
);
|
||||
|
||||
(
|
||||
memory_set, // 地址空间
|
||||
user_stack_top, // 用户栈底和当前的栈顶, 他在地址空间各个逻辑段的上面, 同时
|
||||
elf.header.pt2.entry_point() as usize, // elf文件的入口地址
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
impl MemorySet {
|
||||
// 得到当前地址空间的 页表token
|
||||
pub fn token(&self) -> usize {
|
||||
self.page_table.token()
|
||||
}
|
||||
|
||||
// 从当前地址空间中,根据start 虚拟页 找到逻辑段, 取消映射 一个逻辑段, 并把这个逻辑段 从 areas中删除
|
||||
pub fn remove_area_with_start_vpn(&mut self, start_vpn: VirtPageNum) {
|
||||
if let Some((idx, area)) = self.areas.iter_mut().enumerate().find(|(_, area)| {
|
||||
area.vpn_range.l == start_vpn
|
||||
}) {
|
||||
area.unmap(&mut self.page_table);
|
||||
self.areas.remove(idx);
|
||||
}
|
||||
}
|
||||
|
||||
// 释放当前地址空间的 逻辑页帧areas, 把对应的物理页帧通过RAII 归还给全局物理页帧管理器
|
||||
pub fn recycle_data_pages(&mut self) {
|
||||
//*self = Self::new_bare();
|
||||
self.areas.clear();
|
||||
}
|
||||
|
||||
// 激活当前地址空间
|
||||
pub fn activate(&self) {
|
||||
// let satp = self.page_table.token();
|
||||
// 得到当前地址空间的 页表 的规定格式
|
||||
let satp = self.token();;
|
||||
unsafe {
|
||||
// 设置satp CSR寄存器为我们
|
||||
satp::write(satp);
|
||||
|
||||
// 刷新快表缓存TLB, 这个指令最简单的作用就是清空旧的快表
|
||||
// 更深层次其实是一个内存屏障
|
||||
asm!("sfence.vma");
|
||||
}
|
||||
}
|
||||
|
||||
// 根据 start va 和end va 创建一个 逻辑段类型为逻辑映射, 插入到 当前地址空间
|
||||
pub fn insert_framed_area(&mut self, start_va: VirtAddr, end_va: VirtAddr, permission: MapPermission) {
|
||||
self.push(MapArea::from(start_va, end_va, MapType::Framed, permission), None);
|
||||
}
|
||||
|
||||
// 把一个 逻辑段, 映射到当前页表中
|
||||
fn push(&mut self, mut map_area: MapArea, data: Option<&[u8]>) {
|
||||
map_area.map(&mut self.page_table);
|
||||
if let Some(data) = data {
|
||||
map_area.copy_data(&mut self.page_table, data);
|
||||
}
|
||||
self.areas.push(map_area);
|
||||
}
|
||||
|
||||
/// 创建跳板, 跳板就是 trap.S中的代码段中.text.trampoline, 由 linker.ld手动布局在代码段
|
||||
/// 内核空间和用户空间,他们都会运行这个函数, 插入同样的代码, 把虚拟地址映射为同样的物理地址, 这里内核空间和用户空间执行这段代码的时候, 每个 虚拟地址对应的物理地址是相同的
|
||||
/// 所以 (内核空间的 TRAMPOLINE+指令offset) == (用户空间的 TRAMPOLINE+offset) == (strampoline + offset)
|
||||
/// (内核的 TRAMPOLINE) 和 (用户的 TRAMPOLINE) 和 strampoline 他们都是相等的
|
||||
/// 在 trap.S 切换用户空间之后, 取值执行, 切换空间之前和切换空间之后, 他们对应的虚拟地址空间是相同的, 且都映射到了同一个物理页帧
|
||||
fn map_trampoline(&mut self) {
|
||||
// 直接插入到 把 linker.ld 中的符号strampoline, 映射到最高的虚拟页, 他的物理页帧是 链接脚本中我们手动内存布局的符号
|
||||
// 如果是用户应用, 这个符号的最下面就是 次高页 即 trap context
|
||||
self.page_table.map(
|
||||
VirtAddr::from(TRAMPOLINE).into(),
|
||||
PhysAddr::from(strampoline as usize).into(),
|
||||
PTEFlags::R | PTEFlags::X,
|
||||
);
|
||||
}
|
||||
|
||||
// 创建一个内核用的地址空间
|
||||
pub fn new_kernel() -> Self {
|
||||
let mut memory_set = Self::new();
|
||||
// 跳板创建
|
||||
memory_set.map_trampoline();
|
||||
// map kernel sections
|
||||
println!(".text [{:#x}, {:#x})", stext as usize, etext as usize);
|
||||
println!(".rodata [{:#x}, {:#x})", srodata as usize, erodata as usize);
|
||||
println!(".data [{:#x}, {:#x})", sdata as usize, edata as usize);
|
||||
println!(
|
||||
".bss [{:#x}, {:#x})",
|
||||
sbss_with_stack as usize, ebss as usize
|
||||
);
|
||||
println!("mapping .text section");
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
(stext as usize).into(),
|
||||
(etext as usize).into(),
|
||||
MapType::Identical,
|
||||
MapPermission::R | MapPermission::X,
|
||||
),
|
||||
None,
|
||||
);
|
||||
println!("mapping .rodata section");
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
(srodata as usize).into(),
|
||||
(erodata as usize).into(),
|
||||
MapType::Identical,
|
||||
MapPermission::R,
|
||||
),
|
||||
None,
|
||||
);
|
||||
println!("mapping .data section");
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
(sdata as usize).into(),
|
||||
(edata as usize).into(),
|
||||
MapType::Identical,
|
||||
MapPermission::R | MapPermission::W,
|
||||
),
|
||||
None,
|
||||
);
|
||||
println!("mapping .bss section");
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
(sbss_with_stack as usize).into(),
|
||||
(ebss as usize).into(),
|
||||
MapType::Identical,
|
||||
MapPermission::R | MapPermission::W,
|
||||
),
|
||||
None,
|
||||
);
|
||||
println!("mapping physical memory");
|
||||
memory_set.push(
|
||||
MapArea::from(
|
||||
(ekernel as usize).into(),
|
||||
MEMORY_END.into(),
|
||||
MapType::Identical,
|
||||
MapPermission::R | MapPermission::W,
|
||||
),
|
||||
None,
|
||||
);
|
||||
memory_set
|
||||
}
|
||||
|
||||
|
||||
// 当前地址空间, 缩小 虚拟地址start位置到虚拟地址 new end的位置
|
||||
pub fn shrink_to(&mut self, start: VirtAddr, new_end: VirtAddr) -> bool {
|
||||
// 起始虚拟地址所在的页
|
||||
let start_vpn = start.floor();
|
||||
|
||||
// 找到起始地址所在的段, 传入页表, 把当前段缩小到指定结束位置new_end
|
||||
if let Some(area) = self.areas.iter_mut().find(|area| area.vpn_range.l == start_vpn) {
|
||||
area.shrink_to(&mut self.page_table, new_end.ceil());
|
||||
true
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
// 增加当前的地址空间 扩展为 start到 新的结束的位置
|
||||
pub fn append_to(&mut self, start: VirtAddr, new_end: VirtAddr) -> bool {
|
||||
// 同上, 找到逻辑段之后, 只不过这里是 扩展
|
||||
if let Some(area) = self.areas.iter_mut().find(|area| area.vpn_range.l == start.floor()) {
|
||||
area.append_to(&mut self.page_table, new_end.ceil());
|
||||
true
|
||||
} else {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
// clone 当前的 地址空间 并返回一个新的, 注意虽然地址空间是相同的, 但是 他们的物理地址并不相同
|
||||
pub fn from_existed_user(user_space: &Self) -> Self {
|
||||
// 一个空的地址空间
|
||||
let mut memory_set = Self::new();
|
||||
// 映射跳板
|
||||
memory_set.map_trampoline();
|
||||
|
||||
// copy data sections/trap_context/user_stack
|
||||
// 拷贝数据
|
||||
for area in user_space.areas.iter() {
|
||||
// 根据 当前逻辑段的信息, 创建一个新的数据段
|
||||
let new_area = MapArea::from_another(area);
|
||||
|
||||
// 把逻辑段信息 添加到当前地址空间(顺便也映射ppn)
|
||||
memory_set.push(new_area, None);
|
||||
|
||||
// copy data from another space
|
||||
// 把 当前逻辑段从开始到结束, ppn的数据, copy 到 新的 ppn
|
||||
for vpn in area.vpn_range {
|
||||
let src_ppn = user_space.page_table.get_pte(vpn).unwrap().ppn();
|
||||
let dst_ppn = memory_set.page_table.get_pte(vpn).unwrap().ppn();
|
||||
dst_ppn
|
||||
.get_bytes_array()
|
||||
.copy_from_slice(src_ppn.get_bytes_array());
|
||||
}
|
||||
}
|
||||
memory_set
|
||||
}
|
||||
|
||||
|
||||
}
|
@ -0,0 +1,59 @@
|
||||
use crate::mm::address::VirtAddr;
|
||||
use crate::mm::memory_set::KERNEL_SPACE;
|
||||
use crate::{etext, println, stext};
|
||||
|
||||
pub mod heap_allocator;
|
||||
pub mod address;
|
||||
pub mod frame_allocator;
|
||||
pub mod page_table;
|
||||
pub mod memory_set;
|
||||
|
||||
|
||||
|
||||
pub fn init(){
|
||||
// 开启 内核的内存分配器
|
||||
heap_allocator::init_heap();
|
||||
// 初始化并测试 物理页帧管理器
|
||||
frame_allocator::frame_allocator_test();
|
||||
// 激活内核的地址空间
|
||||
KERNEL_SPACE.exclusive_access().activate();
|
||||
|
||||
remap_test();
|
||||
}
|
||||
|
||||
|
||||
pub fn remap_test() {
|
||||
extern "C" {
|
||||
fn stext();
|
||||
fn etext();
|
||||
fn srodata();
|
||||
fn erodata();
|
||||
fn sdata();
|
||||
fn edata();
|
||||
fn sbss_with_stack();
|
||||
fn ebss();
|
||||
fn ekernel();
|
||||
fn strampoline(); // 这个符号 在linker.ld 中定义
|
||||
}
|
||||
|
||||
let mut kernel_space = KERNEL_SPACE.exclusive_access();
|
||||
let mid_text: VirtAddr = ((stext as usize + etext as usize) / 2).into();
|
||||
let mid_rodata: VirtAddr = ((srodata as usize + erodata as usize) / 2).into();
|
||||
let mid_data: VirtAddr = ((sdata as usize + edata as usize) / 2).into();
|
||||
assert!(!kernel_space
|
||||
.page_table
|
||||
.get_pte(mid_text.floor())
|
||||
.unwrap()
|
||||
.writable(),);
|
||||
assert!(!kernel_space
|
||||
.page_table
|
||||
.get_pte(mid_rodata.floor())
|
||||
.unwrap()
|
||||
.writable(),);
|
||||
assert!(!kernel_space
|
||||
.page_table
|
||||
.get_pte(mid_data.floor())
|
||||
.unwrap()
|
||||
.executable(),);
|
||||
println!("remap_test passed!");
|
||||
}
|
@ -0,0 +1,273 @@
|
||||
use alloc::string::String;
|
||||
use alloc::vec;
|
||||
use alloc::vec::Vec;
|
||||
use bitflags::*;
|
||||
use crate::config::TRAMPOLINE;
|
||||
use crate::mm::address::{PhysAddr, PhysPageNum, VirtAddr, VirtPageNum};
|
||||
use crate::mm::frame_allocator::{frame_alloc, FrameTracker};
|
||||
use crate::println;
|
||||
|
||||
|
||||
bitflags! {
|
||||
pub struct PTEFlags: u8 {
|
||||
const V = 1 << 0; // 仅当位 V 为 1 时,页表项才是合法的
|
||||
const R = 1 << 1; // 可读标志
|
||||
const W = 1 << 2; // 可写标志
|
||||
const X = 1 << 3; // 可执行标志
|
||||
const U = 1 << 4; // 是否允许U级访问
|
||||
const G = 1 << 5; //
|
||||
const A = 1 << 6; // 从上次清零之后, 该页是否被访问过
|
||||
const D = 1 << 7; // 从上次清零之后, 该页是否被修改过
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(C)]
|
||||
/// pte结构体
|
||||
///
|
||||
/// 对应的64个字节的布局为
|
||||
///
|
||||
/// 10bit(保留) | 44bit(物理页号) | 10bit(标志位)
|
||||
pub struct PageTableEntry {
|
||||
pub bits: usize,
|
||||
}
|
||||
|
||||
|
||||
impl PageTableEntry {
|
||||
// 从一个物理页号和一个flag 创建出来一个 PTE
|
||||
// 物理也好 左移10位 加上 flag 即可
|
||||
pub fn from(ppn: PhysPageNum, flags: PTEFlags) -> Self {
|
||||
PageTableEntry {
|
||||
bits: ppn.0 << 10 | flags.bits as usize,
|
||||
}
|
||||
}
|
||||
|
||||
// 生成一个全0的PTE, V也是0, 它是不合法的
|
||||
pub fn new() -> Self {
|
||||
PageTableEntry { bits: 0 }
|
||||
}
|
||||
|
||||
// 从PTE中的到 物理页的地址, 右移bit flag的宽度 再只保留44位即可得到 usize类型的物理页号, 随后调用into进行转换
|
||||
pub fn ppn(&self) -> PhysPageNum {
|
||||
(self.bits >> 10 & ((1usize << 44) - 1)).into()
|
||||
}
|
||||
// 从PTE中得到bit flag
|
||||
pub fn flags(&self) -> PTEFlags {
|
||||
PTEFlags::from_bits(self.bits as u8).unwrap()
|
||||
}
|
||||
|
||||
// 判断是否合法, 只保留 V标志的位置, 再判断是否为0
|
||||
pub fn is_valid(&self) -> bool {
|
||||
(self.flags() & PTEFlags::V) != PTEFlags::empty()
|
||||
}
|
||||
// 判断是否可读
|
||||
pub fn readable(&self) -> bool {
|
||||
(self.flags() & PTEFlags::R) != PTEFlags::empty()
|
||||
}
|
||||
// 判断是否可写
|
||||
pub fn writable(&self) -> bool {
|
||||
(self.flags() & PTEFlags::W) != PTEFlags::empty()
|
||||
}
|
||||
// 判断是否可执行
|
||||
pub fn executable(&self) -> bool {
|
||||
(self.flags() & PTEFlags::X) != PTEFlags::empty()
|
||||
}
|
||||
}
|
||||
|
||||
// 页表
|
||||
pub struct PageTable {
|
||||
root_ppn: PhysPageNum,
|
||||
// 这里保存, 保存了 被映射出来的每级页表的物理帧, 页表被删除时, 页表所占用的物理帧 也被rust释放执行drop还给物理页帧管理器, FrameTracker 实现了 Drop trait
|
||||
frames: Vec<FrameTracker>,
|
||||
}
|
||||
|
||||
impl PageTable {
|
||||
// 创建根节点页表
|
||||
pub fn new() -> Self {
|
||||
let frame = frame_alloc().unwrap();
|
||||
PageTable {
|
||||
root_ppn: frame.ppn,
|
||||
frames: vec![frame],
|
||||
}
|
||||
}
|
||||
|
||||
// 从stap寄存器保存的特定格式的token, 转为根节点页表
|
||||
pub fn from_token(satp: usize) -> Self {
|
||||
Self {
|
||||
// 只保留44位 bit, 这44位bit, 就是 页表所在的物理页帧
|
||||
root_ppn: PhysPageNum::from(satp & ((1usize << 44) - 1)),
|
||||
frames: Vec::new(),
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
impl PageTable {
|
||||
// 得到该页表被设置到 stap 需要的格式
|
||||
// 注意, 这个只能是根节点才会用得到
|
||||
pub fn token(&self) -> usize {
|
||||
// 8 表示MODE, SV39分页机制开启
|
||||
// 4bit 16bit 44bit 构成页表的 stap CSR的格式要求
|
||||
8usize << 60 | self.root_ppn.0
|
||||
}
|
||||
|
||||
// 寻找 指定页号, 如果不存在中间节点, 则创建出来, 知道找到三级页表的 指定下标 的 pte的指针
|
||||
fn find_pte_create(&mut self, vpn: VirtPageNum) -> Option<&mut PageTableEntry> {
|
||||
let idxs = vpn.indexes();
|
||||
let mut ppn = self.root_ppn;
|
||||
let mut result: Option<&mut PageTableEntry> = None;
|
||||
for (i, idx) in idxs.iter().enumerate() {
|
||||
// 得到一级页表的pte
|
||||
let pte = &mut ppn.get_pte_array()[*idx];
|
||||
// 到达最后一级, 不管有无数据直接 跳出, 返回 三级页表保存的信息 0或者指向 物理页44bit+权限10bit 的数据
|
||||
if i == 2 {
|
||||
result = Some(pte);
|
||||
break;
|
||||
}
|
||||
// 如果没有中间节点
|
||||
if pte.is_valid() == false {
|
||||
let frame = frame_alloc().unwrap();
|
||||
*pte = PageTableEntry::from(frame.ppn, PTEFlags::V);
|
||||
self.frames.push(frame);
|
||||
}
|
||||
ppn = pte.ppn();
|
||||
}
|
||||
result
|
||||
}
|
||||
|
||||
// 和 find_pte_create 差不多, 只不过这个不创建中间节点, 缺中间节点立马就返回
|
||||
fn find_pte(&self, vpn: VirtPageNum) -> Option<&mut PageTableEntry> {
|
||||
let idxs = vpn.indexes();
|
||||
let mut ppn = self.root_ppn;
|
||||
let mut result: Option<&mut PageTableEntry> = None;
|
||||
for (i, idx) in idxs.iter().enumerate() {
|
||||
let pte = &mut ppn.get_pte_array()[*idx];
|
||||
if i == 2 {
|
||||
result = Some(pte);
|
||||
break;
|
||||
}
|
||||
if pte.is_valid() == false {
|
||||
return None;
|
||||
}
|
||||
ppn = pte.ppn();
|
||||
}
|
||||
result
|
||||
}
|
||||
|
||||
// 把虚拟页 映射到页表中, 并创建一个 物理页, 然后把物理页ppn组成pte的格式, copy到 虚拟页对应的页表项内
|
||||
pub fn map(&mut self, vpn: VirtPageNum, ppn: PhysPageNum, flags: PTEFlags) {
|
||||
// 查找vpn 没有中间节点就创建出来
|
||||
let pte = self.find_pte_create(vpn).unwrap();
|
||||
assert!(!pte.is_valid(), "vpn {:?} is mapped before mapping", vpn.0);
|
||||
*pte = PageTableEntry::from(ppn, flags | PTEFlags::V);
|
||||
}
|
||||
|
||||
// 把虚拟页 取消映射(注意, 取消之后, 外部一定要 把该虚拟页对应的物理页帧 还给全局的物理页帧管理器)
|
||||
pub fn unmap(&mut self, vpn: VirtPageNum) {
|
||||
let pte = self.find_pte(vpn).unwrap();
|
||||
assert!(pte.is_valid(), "vpn {:?} is invalid before unmapping", vpn.0);
|
||||
*pte = PageTableEntry::new();
|
||||
}
|
||||
|
||||
// 根据虚拟页号, 找到页表中对应的pte
|
||||
pub fn get_pte(&self, vpn: VirtPageNum) -> Option<PageTableEntry> {
|
||||
self.find_pte(vpn).map(|pte| *pte)
|
||||
}
|
||||
|
||||
// 根据虚拟地址, 找到页表中对应的地址
|
||||
pub fn get_pa(&self, va:VirtAddr) -> Option<PhysAddr>{
|
||||
// vp对应的vpn
|
||||
let vpn = va.floor();
|
||||
|
||||
// 找到对应vpn对应的pte
|
||||
if let Some(pte) = self.get_pte(vpn) {
|
||||
// 从pte找到 真实的物理页帧
|
||||
let ppn = pte.ppn();
|
||||
|
||||
// 得到ppn的地址
|
||||
let pa: PhysAddr = ppn.into();
|
||||
let pa_usize: usize = pa.into();
|
||||
|
||||
// 虚拟地址对应的页内偏移
|
||||
let va_offset = va.page_offset();
|
||||
Some((pa_usize+va_offset).into())
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 根据token得到用户应用的页表, 并根据ptr 和len 在页表中找到指定的数据
|
||||
pub fn translated_byte_buffer(token: usize, ptr: *const u8, len: usize) -> Vec<&'static mut [u8]> {
|
||||
// 根据寄存器token, 得到用户页表
|
||||
let page_table = PageTable::from_token(token);
|
||||
|
||||
// 用户空间指定数据 的 逻辑起始位置
|
||||
let mut start = ptr as usize;
|
||||
// 用户空间指定数据的 逻辑结束位置
|
||||
let end = start + len;
|
||||
|
||||
// 循环 逻辑的起始和结束位置, 根据页表,在物理页中寻找数据
|
||||
// 可能 start 和end 跨了很多页, 需要找到每一页并偏移
|
||||
let mut v = Vec::new();
|
||||
while start < end {
|
||||
// 逻辑起始位置对应实际的物理页帧
|
||||
let start_va = VirtAddr::from(start);
|
||||
let mut vpn = start_va.floor();
|
||||
let ppn = page_table.get_pte(vpn).unwrap().ppn();
|
||||
|
||||
// 当前start页 的结束页 就是下一个逻辑页 start+1 的位置
|
||||
vpn = (vpn.0+1).into();
|
||||
let mut end_va: VirtAddr = vpn.into();
|
||||
|
||||
// 找到 比较小的结束位置
|
||||
end_va = end_va.min(VirtAddr::from(end));
|
||||
|
||||
// 如果 不是最后一页, 就找到当前物理页的所有4096字节 进行拷贝
|
||||
if end_va.page_offset() == 0 {
|
||||
v.push(&mut ppn.get_bytes_array()[start_va.page_offset()..]);
|
||||
} else {
|
||||
// 如果是最后一页 就 拷贝到最后的位置
|
||||
v.push(&mut ppn.get_bytes_array()[start_va.page_offset()..end_va.page_offset()]);
|
||||
}
|
||||
|
||||
// 状态转移, 循环 拷贝下一个虚拟逻辑页
|
||||
start = end_va.into();
|
||||
}
|
||||
v
|
||||
}
|
||||
|
||||
// 根据token, 转换指定 虚拟地址空间中的指针ptr 为 指定 物理页帧内真实地址的 引用 &T
|
||||
pub fn translated_refmut<T>(token: usize, ptr: *mut T) -> &'static mut T {
|
||||
let page_table = PageTable::from_token(token);
|
||||
let va = ptr as usize;
|
||||
|
||||
page_table
|
||||
.get_pa(VirtAddr::from(va))
|
||||
.unwrap()
|
||||
.get_mut()
|
||||
}
|
||||
|
||||
// 从token中映射虚拟地址页表, 并根据 虚拟地址ptr 逐个累加地址, 在物理页帧真实地址获得ptr后面的每个字符, 遇到 0 截止
|
||||
pub fn translated_str(token: usize, ptr: *const u8) -> String {
|
||||
let page_table = PageTable::from_token(token);
|
||||
let mut string = String::new();
|
||||
let mut va = ptr as usize;
|
||||
loop {
|
||||
let ch: u8 = *(page_table
|
||||
.get_pa(VirtAddr::from(va))
|
||||
.unwrap()
|
||||
.get_mut()
|
||||
);
|
||||
if ch == 0 {
|
||||
break;
|
||||
} else {
|
||||
string.push(ch as char);
|
||||
va += 1;
|
||||
}
|
||||
}
|
||||
string
|
||||
}
|
||||
|
||||
|
||||
|
@ -0,0 +1,45 @@
|
||||
use core::arch::asm;
|
||||
|
||||
// legacy extensions: ignore fid
|
||||
const SBI_SET_TIMER: usize = 0;
|
||||
const SBI_CONSOLE_PUTCHAR: usize = 1;
|
||||
const SBI_CONSOLE_GETCHAR: usize = 2;
|
||||
const SBI_CLEAR_IPI: usize = 3;
|
||||
const SBI_SEND_IPI: usize = 4;
|
||||
const SBI_REMOTE_FENCE_I: usize = 5;
|
||||
const SBI_REMOTE_SFENCE_VMA: usize = 6;
|
||||
const SBI_REMOTE_SFENCE_VMA_ASID: usize = 7;
|
||||
|
||||
// system reset extension
|
||||
const SRST_EXTENSION: usize = 0x53525354;
|
||||
const SBI_SHUTDOWN: usize = 0;
|
||||
|
||||
#[inline(always)]
|
||||
fn sbi_call(eid: usize, fid: usize, arg0: usize, arg1: usize, arg2: usize) -> usize {
|
||||
let mut ret;
|
||||
unsafe {
|
||||
asm!(
|
||||
"ecall",
|
||||
inlateout("x10") arg0 => ret,
|
||||
in("x11") arg1,
|
||||
in("x12") arg2,
|
||||
in("x16") fid,
|
||||
in("x17") eid,
|
||||
);
|
||||
}
|
||||
ret
|
||||
}
|
||||
|
||||
pub fn console_put_char(c: usize) {
|
||||
sbi_call(SBI_CONSOLE_PUTCHAR, 0, c, 0, 0);
|
||||
}
|
||||
|
||||
pub fn shutdown() -> ! {
|
||||
sbi_call(SRST_EXTENSION, SBI_SHUTDOWN, 0, 0, 0);
|
||||
panic!("It should shutdown!")
|
||||
}
|
||||
|
||||
// 设置 mtimecmp 的值
|
||||
pub fn set_timer(timer: usize) {
|
||||
sbi_rt::set_timer(timer as _);
|
||||
}
|
@ -0,0 +1,4 @@
|
||||
//! Synchronization and interior mutability primitives
|
||||
|
||||
mod up;
|
||||
pub use up::UPSafeCell;
|
@ -0,0 +1,31 @@
|
||||
//! Uniprocessor interior mutability primitives
|
||||
|
||||
use core::cell::{RefCell, RefMut};
|
||||
|
||||
/// Wrap a static data structure inside it so that we are
|
||||
/// able to access it without any `unsafe`.
|
||||
///
|
||||
/// We should only use it in uniprocessor.
|
||||
///
|
||||
/// In order to get mutable reference of inner data, call
|
||||
/// `exclusive_access`.
|
||||
pub struct UPSafeCell<T> {
|
||||
/// inner data
|
||||
inner: RefCell<T>,
|
||||
}
|
||||
|
||||
unsafe impl<T> Sync for UPSafeCell<T> {}
|
||||
|
||||
impl<T> UPSafeCell<T> {
|
||||
/// User is responsible to guarantee that inner struct is only used in
|
||||
/// uniprocessor.
|
||||
pub unsafe fn new(value: T) -> Self {
|
||||
Self {
|
||||
inner: RefCell::new(value),
|
||||
}
|
||||
}
|
||||
/// Exclusive access inner data in UPSafeCell. Panic if the data has been borrowed.
|
||||
pub fn exclusive_access(&self) -> RefMut<'_, T> {
|
||||
self.inner.borrow_mut()
|
||||
}
|
||||
}
|
@ -0,0 +1,61 @@
|
||||
//! File and filesystem-related syscalls
|
||||
|
||||
use sbi_rt::legacy::console_getchar;
|
||||
use crate::mm::page_table::translated_byte_buffer;
|
||||
use crate::print;
|
||||
use crate::task::manager::TASK_MANAGER;
|
||||
use crate::task::processor::current_user_token;
|
||||
use crate::task::suspend_current_and_run_next;
|
||||
|
||||
const FD_STDOUT: usize = 1;
|
||||
|
||||
// 从标准输入读取 指定长度的字符到 虚拟地址buffer中, 目前只支持长度为1
|
||||
pub fn sys_read(fd: usize, buf: *const u8, len: usize) -> isize {
|
||||
match fd {
|
||||
FD_STDIN => {
|
||||
assert_eq!(len, 1, "Only support len = 1 in sys_read!");
|
||||
let mut c: usize;
|
||||
loop {
|
||||
// 利用sbi 从键盘获取输入的
|
||||
c = console_getchar();
|
||||
// 如果是0 说明还没有输入
|
||||
if c == 0 {
|
||||
// 切换进程
|
||||
suspend_current_and_run_next();
|
||||
continue;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
// 把读取的字符 写入到应用的地址空间
|
||||
let ch = c as u8;
|
||||
// 由于目前长度只能为1, 这里直接获取第0个slice 写入
|
||||
let mut buffers = translated_byte_buffer(current_user_token(), buf, len);
|
||||
unsafe {
|
||||
buffers[0].as_mut_ptr().write_volatile(ch);
|
||||
}
|
||||
1
|
||||
}
|
||||
_ => {
|
||||
panic!("Unsupported fd in sys_read!");
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// write buf of length `len` to a file with `fd`
|
||||
pub fn sys_write(fd: usize, buf: *const u8, len: usize) -> isize {
|
||||
match fd {
|
||||
FD_STDOUT => {
|
||||
// 根据当前页表 找到物理内存基地址
|
||||
// 这里需要从应用的地址空间里面寻找数据
|
||||
let buffers = translated_byte_buffer(current_user_token(), buf, len);
|
||||
for buffer in buffers {
|
||||
print!("{}", core::str::from_utf8(buffer).unwrap());
|
||||
}
|
||||
len as isize
|
||||
}
|
||||
_ => {
|
||||
panic!("Unsupported fd in sys_write!");
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,35 @@
|
||||
const SYSCALL_READ: usize = 63;
|
||||
const SYSCALL_WRITE: usize = 64;
|
||||
const SYSCALL_EXIT: usize = 93;
|
||||
const SYSCALL_YIELD: usize = 124;
|
||||
const SYSCALL_GET_TIME: usize = 169;
|
||||
const SYSCALL_GETPID: usize = 172;
|
||||
const SYSCALL_SBRK: usize = 214;
|
||||
const SYSCALL_FORK: usize = 220;
|
||||
const SYSCALL_EXEC: usize = 221;
|
||||
const SYSCALL_WAITPID: usize = 260;
|
||||
|
||||
mod fs;
|
||||
mod process;
|
||||
|
||||
use fs::*;
|
||||
use process::*;
|
||||
use crate::println;
|
||||
|
||||
/// 根据syscall_id 进行分发
|
||||
pub fn syscall(syscall_id: usize, args: [usize; 3]) -> isize {
|
||||
|
||||
match syscall_id {
|
||||
SYSCALL_READ => sys_read(args[0], args[1] as *const u8, args[2]),
|
||||
SYSCALL_WRITE => sys_write(args[0], args[1] as *const u8, args[2]),
|
||||
SYSCALL_EXIT => sys_exit(args[0] as i32),
|
||||
SYSCALL_YIELD => sys_yield(),
|
||||
SYSCALL_GET_TIME => sys_get_time(),
|
||||
SYSCALL_SBRK => sys_sbrk(args[0] as i32),
|
||||
SYSCALL_GETPID => sys_getpid(),
|
||||
SYSCALL_FORK => sys_fork(),
|
||||
SYSCALL_EXEC => sys_exec(args[0] as *const u8),
|
||||
SYSCALL_WAITPID => sys_waitpid(args[0] as isize, args[1] as *mut i32),
|
||||
_ => panic!("Unsupported syscall_id: {}", syscall_id),
|
||||
}
|
||||
}
|
@ -0,0 +1,142 @@
|
||||
//! App management syscalls
|
||||
use alloc::sync::Arc;
|
||||
use crate::loader::get_app_data_by_name;
|
||||
use crate::mm::page_table::{translated_refmut, translated_str};
|
||||
// use crate::batch::run_next_app;
|
||||
use crate::println;
|
||||
use crate::task::{exit_current_and_run_next, suspend_current_and_run_next};
|
||||
use crate::task::manager::add_task;
|
||||
use crate::task::processor::{change_program_brk, current_task, current_user_token};
|
||||
use crate::task::task::TaskStatus;
|
||||
// use crate::task::{change_program_brk, exit_current_and_run_next, suspend_current_and_run_next};
|
||||
use crate::timer::get_time_ms;
|
||||
|
||||
/// 任务退出, 并立即切换任务
|
||||
pub fn sys_exit(exit_code: i32) -> ! {
|
||||
println!("[kernel] Application exited with code {}", exit_code);
|
||||
exit_current_and_run_next(exit_code);
|
||||
panic!("Unreachable in sys_exit!");
|
||||
}
|
||||
|
||||
pub fn sys_yield() -> isize {
|
||||
suspend_current_and_run_next();
|
||||
0
|
||||
}
|
||||
|
||||
pub fn sys_get_time() -> isize {
|
||||
get_time_ms() as isize
|
||||
}
|
||||
|
||||
// 根据传入的 size 对当前堆进行扩容和缩小, 返回值为 失败 或者 申请的空间的起始位置
|
||||
pub fn sys_sbrk(size: i32) -> isize {
|
||||
if let Some(old_brk) = change_program_brk(size) {
|
||||
old_brk as isize
|
||||
} else {
|
||||
-1
|
||||
}
|
||||
}
|
||||
|
||||
pub fn sys_getpid() -> isize {
|
||||
current_task().unwrap().pid.0 as isize
|
||||
}
|
||||
|
||||
pub fn sys_fork() -> isize {
|
||||
// 创建一个会 跳到trap_return的子进程
|
||||
let current_task = current_task().unwrap();
|
||||
let new_task = current_task.fork();
|
||||
let new_pid = new_task.pid.0;
|
||||
|
||||
// 修改子进程 trap_context 中的返回值, 因为父进程在调用sys_call中之后会立即返回
|
||||
let trap_cx = new_task.inner_exclusive_access().get_trap_cx();
|
||||
// 我们之前 进入这个函数的时候, 已经对子进程的 结束陷入的进行返回的地址 +4了
|
||||
// 所以现在只需要改变子进程 陷入之后的返回值即可, 将来子进程会直接从 trap_return运行
|
||||
trap_cx.x[10] = 0;
|
||||
// 添加子任务到全局的 任务管理器
|
||||
add_task(new_task);
|
||||
|
||||
// 返回 子进程的pid 给父进程
|
||||
new_pid as isize
|
||||
}
|
||||
|
||||
// 根据 文件名, 创建替换当前执行的任务
|
||||
pub fn sys_exec(path: *const u8) -> isize {
|
||||
// 当前token
|
||||
let token = current_user_token();
|
||||
// 得到 文件名
|
||||
let path = translated_str(token, path);
|
||||
// 根据文件名对应的二进制数据, 调用exec 替换
|
||||
if let Some(data) = get_app_data_by_name(path.as_str()) {
|
||||
let task = current_task().unwrap();
|
||||
task.exec(data);
|
||||
0
|
||||
} else {
|
||||
// 不存在 返回-1
|
||||
-1
|
||||
}
|
||||
}
|
||||
|
||||
/// pid分为如下几种情况:
|
||||
///
|
||||
/// - -1 表示等待任意进程结束
|
||||
///
|
||||
/// - 1235 表示只等待pid为1234的进程
|
||||
///
|
||||
/// 返回值会返回如下:
|
||||
///
|
||||
/// - -1 表示要等待的进程不是-1(任意进程)是指定进程, 但是指定进程并没有在children中
|
||||
///
|
||||
/// - -2 表示目前还没有僵尸进程
|
||||
///
|
||||
/// - pid 返回被回收的pid
|
||||
///
|
||||
|
||||
pub fn sys_waitpid(pid: isize, exit_code_ptr: *mut i32) -> isize {
|
||||
// 当前进程 这里是父进程
|
||||
let task = current_task().unwrap();
|
||||
// find a child process
|
||||
|
||||
// 如果当前进程内没有对应pid的子进程 则返回-1, 如果传进来的pid是-1, 则表示任何一个子进程都是符合要求的
|
||||
let mut inner = task.inner_exclusive_access();
|
||||
if !inner
|
||||
.children
|
||||
.iter()
|
||||
.any(|p| pid == -1 || pid as usize == p.get_pid())
|
||||
{
|
||||
return -1;
|
||||
// ---- release current PCB
|
||||
}
|
||||
|
||||
// 找到 指定进程且进程为 僵尸进程或者是任意进程
|
||||
let pair = inner.children.iter().enumerate().find(|(_, p)| {
|
||||
// ++++ temporarily access child PCB lock exclusively
|
||||
p.inner_exclusive_access().task_status == TaskStatus::Zombie && (pid == -1 || pid as usize == p.get_pid())
|
||||
// ++++ release child PCB
|
||||
});
|
||||
|
||||
// 如果找到
|
||||
if let Some((idx, _)) = pair {
|
||||
// 从子列表中删除并取出
|
||||
let child = inner.children.remove(idx);
|
||||
// confirm that child will be deallocated after removing from children list
|
||||
// 保证chlid当前是唯一存在的引用, 而不会出现在某个进程的子进程向量中, 更不会出现在处理器监控器或者任务管理器中, child在当前作用于结束后引用计数为0, 彻底删除,
|
||||
// 作用域结束后, 内部的pid 和kernel stack 执行他们自己的drop方法(返还pid给pid管理器, 返还kernel stack的资源还给 KERNEL_SPACE, ), 还有 inner->memory_set->page_table->frames 三级页表本身所占的物理帧
|
||||
|
||||
assert_eq!(Arc::strong_count(&child), 1);
|
||||
let found_pid = child.get_pid();
|
||||
// ++++ temporarily access child TCB exclusively
|
||||
// 找到子进程的退出码
|
||||
let exit_code = child.inner_exclusive_access().exit_code;
|
||||
// ++++ release child PCB
|
||||
|
||||
// 将退出码, 写入到当前进程的地址空间
|
||||
let exit_code_ref = translated_refmut(inner.memory_set.token(), exit_code_ptr);
|
||||
*exit_code_ref = exit_code;
|
||||
|
||||
// 返回回收的子进程的pid
|
||||
found_pid as isize
|
||||
} else {
|
||||
// 如果制定进程不是僵尸进程 返回-2, 上层用户应用调用的 wait pid 会继续等待
|
||||
-2
|
||||
}
|
||||
// ---- release current PCB lock automatically
|
||||
}
|
@ -0,0 +1,44 @@
|
||||
use crate::trap::trap_return;
|
||||
|
||||
// TCB的字段 用来保存cpu 在内核切换人物的时候 寄存器还有栈顶的信息, 这个结构体将来会传到 switch.S 中的汇编中
|
||||
#[derive(Copy, Clone)]
|
||||
#[repr(C)]
|
||||
pub struct TaskContext{
|
||||
ra: usize, // 保存了进行切换完毕之后需要 跳转继续执行的地址
|
||||
sp: usize, // 当前任务的在内核中的内核栈的栈顶, 这个会被switch 保存与恢复
|
||||
s: [usize; 12] // 当前任务内核 有必要 保存的寄存器
|
||||
}
|
||||
|
||||
|
||||
impl TaskContext{
|
||||
// 初始的内容
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
ra: 0,
|
||||
sp: 0,
|
||||
s: [0; 12],
|
||||
}
|
||||
}
|
||||
|
||||
// 从kernel_stack_ptr 创建一个 任务上下文
|
||||
// 并把任务上下文的返回地址设置为 trap.S的返回符号的地方
|
||||
pub fn from(kernel_stack_ptr: usize) -> Self{
|
||||
extern "C" {
|
||||
fn __restore();
|
||||
}
|
||||
Self {
|
||||
ra: __restore as usize, // 新创建的任务, 在switch ret 之后 直接进入 trap返回函数
|
||||
sp: kernel_stack_ptr, // 这里设置 应用内核栈的栈顶了, 后面会被switch 恢复, 所以我们在trap.S中 注释mv sp, a0
|
||||
s: [0; 12],
|
||||
}
|
||||
}
|
||||
|
||||
/// 根据用户当前内核栈做的栈顶 构造一个 任务上下文, 并把 trap_return 设置为 switch切换 ret的返回地址
|
||||
pub fn goto_trap_return(kstack_ptr: usize) -> Self {
|
||||
Self {
|
||||
ra: trap_return as usize, // 这里是 在内核空间的 函数地址 (当然 task context 只有在内核态才是可见的)
|
||||
sp: kstack_ptr,
|
||||
s: [0; 12],
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,46 @@
|
||||
use alloc::collections::VecDeque;
|
||||
use alloc::sync::Arc;
|
||||
use lazy_static::lazy_static;
|
||||
use crate::println;
|
||||
use crate::task::task::TaskControlBlock;
|
||||
use crate::task::UPSafeCell;
|
||||
|
||||
/// 任务管理器 仅负责管理所有任务, 由ch4 TaskManager 拆分的,
|
||||
/// 先入先出的双端队列
|
||||
pub struct TaskManager {
|
||||
ready_queue: VecDeque<Arc<TaskControlBlock>>,
|
||||
}
|
||||
|
||||
impl TaskManager {
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
ready_queue: VecDeque::new(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl TaskManager {
|
||||
// 添加一个任务到 队列中
|
||||
pub fn add(&mut self, task: Arc<TaskControlBlock>) {
|
||||
self.ready_queue.push_back(task);
|
||||
}
|
||||
// 如果有任务, 弹出第一个任务
|
||||
pub fn fetch(&mut self) -> Option<Arc<TaskControlBlock>> {
|
||||
self.ready_queue.pop_front()
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
lazy_static! {
|
||||
// 全局的任务管理器
|
||||
pub static ref TASK_MANAGER: UPSafeCell<TaskManager> = unsafe { UPSafeCell::new(TaskManager::new()) };
|
||||
}
|
||||
/// 给全局任务管理器添加任务
|
||||
pub fn add_task(task: Arc<TaskControlBlock>) {
|
||||
TASK_MANAGER.exclusive_access().add(task);
|
||||
}
|
||||
// 全局任务管理器 弹出任务
|
||||
pub fn pop_task() -> Option<Arc<TaskControlBlock>> {
|
||||
TASK_MANAGER.exclusive_access().fetch()
|
||||
}
|
@ -0,0 +1,130 @@
|
||||
use lazy_static::lazy_static;
|
||||
use alloc::vec::Vec;
|
||||
use crate::config::MAX_APP_NUM;
|
||||
use crate::sync::UPSafeCell;
|
||||
use crate::task::task::{TaskControlBlock, TaskStatus};
|
||||
use crate::loader::{get_num_app, get_app_data};
|
||||
use crate::println;
|
||||
use crate::sbi::shutdown;
|
||||
use crate::task::context::TaskContext;
|
||||
use crate::task::manager::{add_task, TASK_MANAGER};
|
||||
use crate::task::processor::{kernel_time_start, refresh_stop_clock, schedule, take_current_task};
|
||||
use crate::task::switch::__switch;
|
||||
use crate::timer::{get_time_ms, get_time_us};
|
||||
use crate::trap::TrapContext;
|
||||
use alloc::sync::Arc;
|
||||
use crate::loader::get_app_data_by_name;
|
||||
|
||||
mod context;
|
||||
mod switch;
|
||||
pub mod task;
|
||||
mod pid;
|
||||
pub mod manager;
|
||||
pub mod processor;
|
||||
|
||||
pub use processor::{run_tasks};
|
||||
|
||||
pub const IDLE_PID: usize = 0;
|
||||
|
||||
lazy_static! {
|
||||
/// 初始化用户shell的全局进程, 他的pid是0
|
||||
pub static ref INITPROC: Arc<TaskControlBlock> = Arc::new(TaskControlBlock::from(get_app_data_by_name("initproc").unwrap()));
|
||||
}
|
||||
|
||||
/// 添加初始化 Process 到 全局任务管理器
|
||||
pub fn add_initproc() {
|
||||
add_task(INITPROC.clone());
|
||||
}
|
||||
|
||||
// 挂起当前运行下一个, 需要把当前任务 从Process中 take 取出来, 然后再 push回 全局的任务管理器
|
||||
pub fn suspend_current_and_run_next() {
|
||||
|
||||
// 必须有一个程序在运行,
|
||||
let task = take_current_task().unwrap();
|
||||
|
||||
// ---- access current TCB exclusively
|
||||
// 当前正在执行的Process
|
||||
let mut task_inner = task.inner_exclusive_access();
|
||||
let task_cx_ptr = &mut task_inner.task_cx as *mut TaskContext;
|
||||
// Change status to Ready
|
||||
task_inner.task_status = TaskStatus::Ready;
|
||||
|
||||
// 统计内核时间
|
||||
let kernel_time = refresh_stop_clock();
|
||||
task_inner.kernel_time += kernel_time;
|
||||
|
||||
drop(task_inner);
|
||||
// ---- release current PCB
|
||||
|
||||
// 把当前任务 push回全局的任务管理器
|
||||
add_task(task);
|
||||
|
||||
// jump to scheduling cycle
|
||||
schedule(task_cx_ptr);
|
||||
}
|
||||
|
||||
pub fn exit_current_and_run_next(exit_code: i32) {
|
||||
// 从 Process 管理器中 转移所有权的取出当前cpu执行的任务
|
||||
let task = take_current_task().unwrap();
|
||||
|
||||
// 当前pid
|
||||
let pid = task.get_pid();
|
||||
|
||||
// 如果是idle进程
|
||||
if pid == IDLE_PID {
|
||||
println!(
|
||||
"[kernel] Idle process exit with exit_code {} ...",
|
||||
exit_code
|
||||
);
|
||||
if exit_code != 0 {
|
||||
//crate::sbi::shutdown(255); //255 == -1 for err hint
|
||||
shutdown()
|
||||
} else {
|
||||
//crate::sbi::shutdown(0); //0 for success hint
|
||||
shutdown()
|
||||
}
|
||||
}
|
||||
|
||||
// 改变pcb 的状态, 从当前task获取inner, 也就是当前当前pcb需要变化的值
|
||||
let mut inner = task.inner_exclusive_access();
|
||||
// 将状态更改为 僵尸进程, 供后续父进程查找回收资源
|
||||
inner.task_status = TaskStatus::Zombie;
|
||||
// 写入退出码
|
||||
inner.exit_code = exit_code;
|
||||
// 不需要修改父进程, 因为所有进程的父进程这里都为 initproc
|
||||
|
||||
// 把当前进程, 所有的子进程, 都挂载到 initproc进程
|
||||
{
|
||||
let mut initproc_inner = INITPROC.inner_exclusive_access();
|
||||
for child in inner.children.iter() {
|
||||
child.inner_exclusive_access().parent = Some(Arc::downgrade(&INITPROC)); // 父进程 一个弱引用
|
||||
initproc_inner.children.push(child.clone()); // 挂载到initproc进程的childre中, 引用计数 +1, 现在是2
|
||||
}
|
||||
}
|
||||
|
||||
inner.children.clear(); // 子进程引用计数-1 现在又变成1了
|
||||
|
||||
// 统计内核时间
|
||||
let kernel_time = refresh_stop_clock();
|
||||
inner.kernel_time += kernel_time;
|
||||
println!("[kernel] user_time: {}ms, kernel_time: {}ms", inner.user_time /1000, inner.kernel_time / 1000);
|
||||
|
||||
|
||||
// 释放当前地址空间中, 逻辑段清空, areas->MapArea->data_frames->FrameTracker 执行析构, 过程是把areas中的物理页帧 根据 RAII还给操作系统
|
||||
// 注意 页表本身占用的 三级页表的物理帧(page_table->frames), 还没有被释放, 因为我们还需要使用, 这需要父进程管理进行释放
|
||||
inner.memory_set.recycle_data_pages();
|
||||
drop(inner);
|
||||
|
||||
|
||||
// 手动删除tcb, 后面这里永远不会执行了, 我们智能指针需要手动释放(这里需要给引用计数-1)
|
||||
drop(task);
|
||||
|
||||
// 当前task 函数 为什么在 recycle_data_pages 之后还能执行? 函数栈帧为什么还能使用? 是因为我们虽然把 应用程序锁使用的逻辑页帧都取消映射了, 但是关于 task中的 pid 和kernel stack 还没有被释放
|
||||
// task 他在被fork的时候 parent_inner.children.push(task_control_block.clone()); 也clone了自己一份到父进程中, 所以这里删除drop只是删除了当前 Process中管理的引用计数(后续我们不会执行到这里了, 需要手动删除)
|
||||
|
||||
// 这个进程不会被执行了, 我们当前栈帧随便创建一个上下文就好了
|
||||
let mut _unused = TaskContext::new();
|
||||
|
||||
// 输出一下
|
||||
schedule(&mut _unused as *mut _);
|
||||
}
|
@ -0,0 +1,149 @@
|
||||
use alloc::vec::Vec;
|
||||
use lazy_static::lazy_static;
|
||||
use crate::config::{KERNEL_STACK_SIZE, PAGE_SIZE, TRAMPOLINE};
|
||||
use crate::mm::address::VirtAddr;
|
||||
use crate::mm::memory_set::{KERNEL_SPACE, MapPermission};
|
||||
use crate::sync::UPSafeCell;
|
||||
|
||||
// pid分配器
|
||||
pub struct PidAllocator {
|
||||
current: usize, // 当前分配到多少号了
|
||||
recycled: Vec<usize>, // 被回收的pid, 后续可以再次利用
|
||||
}
|
||||
|
||||
// 全局的pid分配器
|
||||
lazy_static! {
|
||||
pub static ref PID_ALLOCATOR: UPSafeCell<PidAllocator> =
|
||||
unsafe { UPSafeCell::new(PidAllocator::new()) };
|
||||
}
|
||||
|
||||
pub fn pid_alloc() -> PidHandle {
|
||||
PID_ALLOCATOR.exclusive_access().alloc()
|
||||
}
|
||||
|
||||
|
||||
impl PidAllocator {
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
current: 0,
|
||||
recycled: Vec::new(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl PidAllocator {
|
||||
// 分配一个pid
|
||||
pub fn alloc(&mut self) -> PidHandle {
|
||||
if let Some(pid) = self.recycled.pop() {
|
||||
PidHandle(pid)
|
||||
} else {
|
||||
let current = self.current;
|
||||
self.current += 1;
|
||||
PidHandle(current)
|
||||
}
|
||||
}
|
||||
|
||||
// 取消分配一个pid
|
||||
pub fn dealloc(&mut self, pid: usize) {
|
||||
assert!(pid < self.current);
|
||||
// 防止二次释放
|
||||
assert!(
|
||||
!self.recycled.iter().any(|tmp_pid| *tmp_pid == pid),
|
||||
"pid {} has been deallocated!",
|
||||
pid
|
||||
);
|
||||
|
||||
self.recycled.push(pid);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 用来表示进程的唯一标识符, RAII思想来进行释放管理
|
||||
pub struct PidHandle(pub usize);
|
||||
|
||||
// pid_handle 被drop时, 同时把pid 还给全局管理器
|
||||
impl Drop for PidHandle {
|
||||
fn drop(&mut self) {
|
||||
PID_ALLOCATOR.exclusive_access().dealloc(self.0);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/// 得到 "用户程序的内核栈" 的在 内核本身地址空间 中的虚拟位置(当然由于恒等映射其实也是实际的物理地址)
|
||||
/// 这个在 跳板的下面的某个位置
|
||||
/// 每个用户除了分配 KERNEL_STACK_SIZE 大小外, 还额外 增加 一个PAGE_SIZE 放在比栈底要高的地址 用来隔离每个用户内核栈
|
||||
/// 根据 pid 在相应的位置, 得到app 内核栈的它处于的位置, 位置, 注意代码实现, 这个是有保护页面的(1 pagesize),
|
||||
/// 在逻辑地址空间存在保护页面(保护页面不会被映射), 但是在物理地址空间,这个保护页会被随时被物理页帧管理器分配走
|
||||
/// 返回的 top是内存的高地址, bottom是内存的低地址
|
||||
pub fn kernel_stack_position(pid: usize) -> (usize, usize) {
|
||||
let top = TRAMPOLINE - pid * (KERNEL_STACK_SIZE + PAGE_SIZE);
|
||||
// 栈底只需要 KERNEL_STACK_SIZE 即可,
|
||||
let bottom = top - KERNEL_STACK_SIZE;
|
||||
(bottom, top)
|
||||
}
|
||||
|
||||
// 新的结构体, 内核栈, 之前我们是根据 app_id 找到的, 现在我们需要改成 统一分配的pid, 根据pid摆放应用内核栈的位置
|
||||
pub struct KernelStack {
|
||||
pid: usize,
|
||||
}
|
||||
|
||||
impl KernelStack {
|
||||
// push 一个 泛型, 到 内核栈中, 直接减去T的大小, 再写入即可
|
||||
pub fn push_on_top<T: Sized>(&self, value: T) -> *mut T {
|
||||
let kernel_stack_top = self.get_top();
|
||||
let kernel_stack_top = self.get_top();
|
||||
let ptr_mut = (kernel_stack_top - core::mem::size_of::<T>()) as *mut T;
|
||||
unsafe {
|
||||
*ptr_mut = value;
|
||||
}
|
||||
ptr_mut
|
||||
}
|
||||
|
||||
// 得到当前内核栈的 栈底(高地址)
|
||||
pub fn get_top(&self) -> usize {
|
||||
let (_, kernel_stack_top) = kernel_stack_position(self.pid);
|
||||
kernel_stack_top
|
||||
}
|
||||
}
|
||||
|
||||
impl KernelStack {
|
||||
// 根据 pid handle 在内核空间(最高页的下面) 某个位置, 创建一个 逻辑段 作为应用的内核栈
|
||||
pub fn from(pid_handle: &PidHandle) -> Self {
|
||||
let pid = pid_handle.0;
|
||||
|
||||
// 根据 pid 创建受保护的用户的任务内核栈, 并得到栈的起始地址和结束地址, 这个在次高页的下面的 某个位置
|
||||
// kernel_stack_bottom = kernel_stack_top - PAGESIZE * 2
|
||||
// kernel_stack_top 是当前栈的栈顶, 同时也是现在没有push操作也是栈底
|
||||
// 这里都是虚拟地址
|
||||
let (kernel_stack_bottom, kernel_stack_top) = kernel_stack_position(pid);
|
||||
|
||||
// 把用户的内核栈逻辑段, 映射并创建出来实际的物理页帧, 到内核地址空间, 供内核态可以进行寻址找到用户应用的内核栈,
|
||||
// 这里使用虚拟映射 而不是恒等映射, 是因为需要动态调整?
|
||||
// 这个只有在内核会用到
|
||||
KERNEL_SPACE
|
||||
.exclusive_access()
|
||||
.insert_framed_area(
|
||||
kernel_stack_bottom.into(),
|
||||
kernel_stack_top.into(),
|
||||
MapPermission::R | MapPermission::W,
|
||||
);
|
||||
KernelStack { pid: pid_handle.0 }
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 当kernel stack 生命周期结束, 对应 new 出来的一个 应用内核栈 逻辑段也随之删除
|
||||
// 注意! 一般这个是在 wait_pid 内用的, 用于父进程回收子进程资源时, 子进程内的字段根据RAII执行
|
||||
impl Drop for KernelStack {
|
||||
fn drop(&mut self) {
|
||||
let (kernel_stack_bottom, _) = kernel_stack_position(self.pid);
|
||||
let kernel_stack_bottom_va: VirtAddr = kernel_stack_bottom.into();
|
||||
KERNEL_SPACE
|
||||
.exclusive_access()
|
||||
.remove_area_with_start_vpn(kernel_stack_bottom_va.into());
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
@ -0,0 +1,187 @@
|
||||
use alloc::sync::Arc;
|
||||
use lazy_static::lazy_static;
|
||||
use crate::println;
|
||||
use crate::task::context::TaskContext;
|
||||
use crate::task::switch::__switch;
|
||||
use crate::task::task::{TaskControlBlock, TaskStatus};
|
||||
use crate::trap::TrapContext;
|
||||
use crate::sync::UPSafeCell;
|
||||
use crate::task::manager::{pop_task, TASK_MANAGER};
|
||||
use crate::timer::{get_time_ms, get_time_us};
|
||||
|
||||
///维护在一个处理器上正在执行的任务, 这在ch4 中是 TaskManager做的, 现在拆分
|
||||
pub struct Processor {
|
||||
/// 当前处理器上正在执行的任务, 他是一个被option 包裹的 智能指针, 保证 TCB 要不在这个结构体中, 要不就是在全局的任务管理器上
|
||||
current: Option<Arc<TaskControlBlock>>,
|
||||
/// 当前处理器上的 idle 控制流的任务上下文, 当任务切换的时候, 先切换到这个
|
||||
/// 这样做的主要目的是使得换入/换出进程和调度执行流在内核层各自执行在不同的内核栈上,
|
||||
/// 分别是进程自身的内核栈和内核初始化时使用的启动栈
|
||||
/// 这样的话, 调度相关的数据不会出现在进程内核栈上,
|
||||
/// 也使得调度机制对于换出进程的Trap执行流是不可见的
|
||||
/// 它在决定换出的时候只需调用schedule而无需操心调度的事情
|
||||
/// 从而各执行流的分工更加明确了, 虽然带来了更大的开销
|
||||
/// 虽然 永远不会执行这个 task context 的任务, 他只保存 内核的启动栈
|
||||
idle_task_cx: TaskContext,
|
||||
pub clock_time: usize, // 处理器时间
|
||||
}
|
||||
|
||||
|
||||
impl Processor {
|
||||
///Create an empty Processor
|
||||
/// 一旦程序开始运行, 就开始在内核栈或者用户栈之间切换, 永远 不会运行到这个, 这个就是保存 内核的启动栈的
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
current: None,
|
||||
idle_task_cx: TaskContext::new(),
|
||||
clock_time: 0
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Processor {
|
||||
// 得到当前 task context 的指针
|
||||
fn get_idle_task_cx_ptr(&mut self) -> *mut TaskContext {
|
||||
&mut self.idle_task_cx as *mut _
|
||||
}
|
||||
/// 取出当前正在执行的任务
|
||||
pub fn take_current(&mut self) -> Option<Arc<TaskControlBlock>> {
|
||||
self.current.take()
|
||||
}
|
||||
|
||||
///当前正在执行的任务的 copy
|
||||
pub fn current(&self) -> Option<Arc<TaskControlBlock>> {
|
||||
self.current.as_ref().map(Arc::clone)
|
||||
}
|
||||
|
||||
// 掐表函数
|
||||
fn refresh_stop_clock(&mut self) -> usize {
|
||||
// 上次停表的时间
|
||||
let start_time = self.clock_time;
|
||||
// 当前时间
|
||||
self.clock_time = get_time_us();
|
||||
// 返回 当前时间 - 上次停表时间 = 时间间距
|
||||
self.clock_time - start_time
|
||||
}
|
||||
|
||||
// 即将进入用户态, 把之前使用的内核时间统计
|
||||
fn user_time_start(&mut self) {
|
||||
let use_clock_time = self.refresh_stop_clock();
|
||||
self.current.as_ref().unwrap().inner_exclusive_access().kernel_time += use_clock_time;
|
||||
}
|
||||
|
||||
fn kernel_time_start(&mut self) {
|
||||
let use_clock_time = self.refresh_stop_clock();
|
||||
self.current.as_ref().unwrap().inner_exclusive_access().user_time += use_clock_time;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
// 全局 描述cpu状态的管理器
|
||||
lazy_static! {
|
||||
pub static ref PROCESSOR: UPSafeCell<Processor> = unsafe { UPSafeCell::new(Processor::new()) };
|
||||
}
|
||||
|
||||
|
||||
// 循环 全局的任务管理器'fetch_task'获取需要运行的下一个进程, 并通过'__switch' 和当前process切换进程,
|
||||
// 这和之前的 run_first_task 差不多
|
||||
pub fn run_tasks() {
|
||||
loop {
|
||||
// 获得当前 进程的管理对象
|
||||
let mut processor = PROCESSOR.exclusive_access();
|
||||
|
||||
// 弹出一个任务
|
||||
if let Some(task) = pop_task() {
|
||||
// 当前运行的进程(第一次运行时,这里是空的 zero, 但是不影响, 因为永远不会执行到第一次运行的任务)
|
||||
let idle_task_cx_ptr = processor.get_idle_task_cx_ptr();
|
||||
|
||||
// 获得下一个需要运行的进程 的task context的指针
|
||||
let mut task_inner = task.inner_exclusive_access();
|
||||
let next_task_cx_ptr = &task_inner.task_cx as *const TaskContext;
|
||||
task_inner.task_status = TaskStatus::Running;
|
||||
|
||||
// 删除内部可变性的引用, 这里需要手动释放
|
||||
drop(task_inner);
|
||||
|
||||
// 修改process的状态, 把下一个需要运行的进程 move到 Process中被管理, 保证引用计数为1
|
||||
processor.current = Some(task);
|
||||
|
||||
// 这里需要手动释放, 同上, 因为switch跳出作用域了, 不会通过作用域自动析构 refcell
|
||||
drop(processor);
|
||||
|
||||
unsafe {
|
||||
__switch(idle_task_cx_ptr, next_task_cx_ptr);
|
||||
|
||||
// 调用 schedule 之后 内部又调用__switch, next task 也就是idle task会走入到这里, 开启新的循环获取新的任务
|
||||
// 其实 idle task 并不会执行, 他只是保存 内核的启动栈 也就是当前函数 的寄存器状态
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// 掐表函数
|
||||
pub fn refresh_stop_clock() -> usize {
|
||||
PROCESSOR.exclusive_access().refresh_stop_clock()
|
||||
}
|
||||
|
||||
// 用户应用 进入用户态开始计时
|
||||
pub fn user_time_start(){
|
||||
PROCESSOR.exclusive_access().user_time_start();
|
||||
}
|
||||
|
||||
// 用户应用 进入内核态开始计时
|
||||
pub fn kernel_time_start(){
|
||||
PROCESSOR.exclusive_access().kernel_time_start();
|
||||
}
|
||||
|
||||
// 取出当前正在执行的任务
|
||||
pub fn take_current_task() -> Option<Arc<TaskControlBlock>> {
|
||||
PROCESSOR.exclusive_access().take_current()
|
||||
}
|
||||
|
||||
// 返回当前正在执行的任务的 copy版本
|
||||
pub fn current_task() -> Option<Arc<TaskControlBlock>> {
|
||||
PROCESSOR.exclusive_access().current()
|
||||
}
|
||||
|
||||
//得到当前正在执行任务的token
|
||||
pub fn current_user_token() -> usize {
|
||||
// 得到当前正在执行的任务
|
||||
let task = current_task().unwrap();
|
||||
// 得到当前正在执行任务的token
|
||||
let token = task.inner_exclusive_access().get_user_token();
|
||||
token
|
||||
}
|
||||
|
||||
// 得到当前 task context 的指针
|
||||
pub fn current_trap_cx() -> &'static mut TrapContext {
|
||||
current_task()
|
||||
.unwrap()
|
||||
.inner_exclusive_access()
|
||||
.get_trap_cx()
|
||||
}
|
||||
|
||||
// 扩张/缩减, 当前运行进程的地址空间中的堆段, 指定字节的数据
|
||||
pub fn change_program_brk(size: i32) -> Option<usize> {
|
||||
current_task().as_ref().unwrap().inner_exclusive_access().change_program_brk(size)
|
||||
}
|
||||
|
||||
|
||||
// 传入当前运行的任务指针, 切换到 idle 任务
|
||||
// 用尽时间片, 或者调用 yield之后会调用这个, 调用这个之后, 会回到 run_task __switch返回的位置, 开启下一轮循环 中执行
|
||||
pub fn schedule(switched_task_cx_ptr: *mut TaskContext) {
|
||||
// 进程管理对象
|
||||
let mut processor = PROCESSOR.exclusive_access();
|
||||
|
||||
// 得到当前进程管理中 task context 指针
|
||||
let idle_task_cx_ptr = processor.get_idle_task_cx_ptr();
|
||||
drop(processor);
|
||||
|
||||
// 切换 汇编会保存当前的寄存器状态到 switched_task_cx_ptr 中, 然后根据 idle_task_cx_ptr 继续执行 __switch 的下一行, 结束当前循环, 开启新的循环
|
||||
unsafe {
|
||||
__switch(switched_task_cx_ptr, idle_task_cx_ptr);
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -0,0 +1,44 @@
|
||||
# os/src/task/switch.S
|
||||
|
||||
.altmacro
|
||||
.macro SAVE_SN n
|
||||
sd s\n, (\n+2)*8(a0) # 将寄存器s(n)的值保存到当前任务的上下文中
|
||||
.endm
|
||||
|
||||
.macro LOAD_SN n
|
||||
ld s\n, (\n+2)*8(a1) # 从下一个任务的上下文中加载寄存器s(n)的值
|
||||
.endm
|
||||
.section .text
|
||||
.globl __switch
|
||||
|
||||
__switch:
|
||||
# 阶段 [1]
|
||||
# __switch(
|
||||
# current_task_cx_ptr: *mut TaskContext,
|
||||
# next_task_cx_ptr: *const TaskContext
|
||||
# )
|
||||
|
||||
# 阶段 [2] 保存当前寄存器状态到 current_task_cx_ptr
|
||||
# save kernel stack of current task
|
||||
sd sp, 8(a0) # 将当前任务的在内核栈顶 保存到当前任务current_task_cx_ptr的上下文中
|
||||
# save ra & s0~s11 of current execution
|
||||
sd ra, 0(a0) # 将当前执行的ra和s0~s11寄存器的值保存到当前任务current_task_cx_ptr的上下文中
|
||||
.set n, 0
|
||||
.rept 12
|
||||
SAVE_SN %n # 保存寄存器s0~s11的值到当前任务的上下文中
|
||||
.set n, n + 1
|
||||
.endr
|
||||
|
||||
# 阶段 [3] 恢复next_task_cx_ptr 的状态
|
||||
# restore ra & s0~s11 of next execution
|
||||
ld ra, 0(a1) # 从下一个任务的上下文中加载ra寄存器的值
|
||||
.set n, 0
|
||||
.rept 12
|
||||
LOAD_SN %n # 从下一个任务的上下文中加载寄存器s0~s11的值
|
||||
.set n, n + 1
|
||||
.endr
|
||||
# restore kernel stack of next task
|
||||
ld sp, 8(a1) # 从下一个任务的上下文中加载内核栈栈顶的值
|
||||
# 阶段 [4]
|
||||
__switch_ret:
|
||||
ret # 返回到下一个任务的执行点
|
@ -0,0 +1,11 @@
|
||||
use core::arch::global_asm;
|
||||
global_asm!(include_str!("switch.S")); // 读入switch.S 到当前代码
|
||||
|
||||
use super::context::TaskContext;
|
||||
extern "C" {
|
||||
// 引入 switch.S 中的切换函数
|
||||
pub fn __switch(
|
||||
current_task_cx_ptr: *mut TaskContext,
|
||||
next_task_cx_ptr: *const TaskContext
|
||||
);
|
||||
}
|
@ -0,0 +1,261 @@
|
||||
use alloc::sync::{Arc, Weak};
|
||||
use alloc::vec::Vec;
|
||||
use core::cell::RefMut;
|
||||
use crate::config::{TRAP_CONTEXT};
|
||||
use crate::mm::address::{PhysPageNum, VirtAddr};
|
||||
use crate::mm::memory_set::{KERNEL_SPACE, MapPermission, MemorySet};
|
||||
use crate::println;
|
||||
use crate::sync::UPSafeCell;
|
||||
use crate::task::context::{TaskContext};
|
||||
use crate::task::pid::{kernel_stack_position, KernelStack, pid_alloc, PidHandle};
|
||||
use crate::trap::{trap_handler, TrapContext};
|
||||
|
||||
// TCB的字段, 用来保存任务的状态
|
||||
#[derive(Copy, Clone, PartialEq)]
|
||||
pub enum TaskStatus {
|
||||
Ready,
|
||||
Running,
|
||||
Zombie,
|
||||
}
|
||||
|
||||
// 把 ch4 的TaskManagerInner 和 TaskControlBlock 整合为 TaskControlBlock, 现在被 TaskManager 关联和管理
|
||||
// 在内核中, 它等价与一个进程
|
||||
pub struct TaskControlBlock {
|
||||
// 初始化后不再变化的元数据
|
||||
pub pid: PidHandle,
|
||||
pub kernel_stack: KernelStack,
|
||||
|
||||
// 初始化后 需要变化的元数据
|
||||
inner: UPSafeCell<TaskControlBlockInner>,
|
||||
}
|
||||
|
||||
pub struct TaskControlBlockInner {
|
||||
pub user_time: usize, // 用户态程序用的时间
|
||||
pub kernel_time: usize, // 内核态程序所用的时间
|
||||
pub trap_cx_ppn: PhysPageNum, // tcb访问 trap context所在的真实的物理页, 它对应逻辑页的次高页
|
||||
pub task_cx: TaskContext,
|
||||
pub task_status: TaskStatus,
|
||||
pub memory_set: MemorySet, // tcb他自己的地址空间
|
||||
pub parent: Option<Weak<TaskControlBlock>>, // 不包含父进程引用计数的弱指针
|
||||
pub children: Vec<Arc<TaskControlBlock>>, // 所有的子进程 arc智能指针, 只有引用计数为0的时候, 绑定的各类资源才能回收
|
||||
pub exit_code: i32, // 该进程退出时的 退出码
|
||||
pub base_size: usize, // 应用地址空间中从0x0开始到用户栈结束一共包含多少字节, 就是用户数据有多大
|
||||
pub heap_bottom: usize, // 堆的起始地址 这个一开始和base_size 是一样的
|
||||
pub program_brk: usize, // 这个一开始和base_size 是一样的, 表示进程当前的堆边界, 即堆的顶部地址, 它指向堆中最后一个已分配内存块的末尾, 下一个内存分配将从该地址开始
|
||||
// base_size(低地址) --- TRAP_CONTEXT(次高页) 的虚拟空间, 可以当做堆来使用
|
||||
}
|
||||
|
||||
impl TaskControlBlock {
|
||||
// 得到具有内部可变性的字段
|
||||
pub fn inner_exclusive_access(&self) -> RefMut<'_, TaskControlBlockInner> {
|
||||
self.inner.exclusive_access()
|
||||
}
|
||||
pub fn get_pid(&self) -> usize {
|
||||
self.pid.0
|
||||
}
|
||||
}
|
||||
|
||||
impl TaskControlBlock {
|
||||
// 根据 elf data 新建一个 TCB, 这个只在初始化 INITPROC 时候用
|
||||
pub fn from(elf_data: &[u8]) -> Self {
|
||||
// memory_set with elf program headers/trampoline/trap context/user stack
|
||||
// 返回 内存空间, 用户栈的栈底和当前栈顶, 和入口地址
|
||||
let (memory_set, user_sp, entry_point) = MemorySet::from_elf(elf_data);
|
||||
// 在当前的地址空间中, 找到 trap_context 逻辑页 所在的真实物理页, 他逻辑地址在次高页, 真实物理地址是我们在 from_elf 申请映射的未知地址
|
||||
// 这个真实的物理地址, 我们后续再陷入的时候会用到, 进行强写数据
|
||||
let trap_cx_ppn = memory_set
|
||||
.page_table
|
||||
.get_pte(VirtAddr::from(TRAP_CONTEXT).into()) // 虚拟地址次高页, 所在对应的物理内存的pte,
|
||||
.unwrap()
|
||||
.ppn(); // pte 内的ppn, 得到实际 虚拟内存次高页 所在的物理页号
|
||||
|
||||
// 从全局pid分配器, 得到一个pid
|
||||
let pid_handle = pid_alloc();
|
||||
|
||||
// 根据pid, 得到内核栈并得到高地址(栈底)
|
||||
let kernel_stack = KernelStack::from(&pid_handle);
|
||||
let kernel_stack_top = kernel_stack.get_top();
|
||||
|
||||
// 构建 任务控制块
|
||||
let task_control_block = Self {
|
||||
pid: pid_handle,
|
||||
kernel_stack: kernel_stack,
|
||||
inner: unsafe {
|
||||
UPSafeCell::new(TaskControlBlockInner{
|
||||
user_time: 0,
|
||||
kernel_time: 0,
|
||||
task_status:TaskStatus::Ready,
|
||||
task_cx: TaskContext::goto_trap_return(kernel_stack_top), // 根据内核栈构造任务切换上下文, 并把 switch任务切换的 ra 设置为 trap_return的函数地址
|
||||
memory_set, // 新增, 当前任务的地址空间
|
||||
parent: None,
|
||||
children: Vec::new(),
|
||||
trap_cx_ppn, // 新增 逻辑次高页的trap context, 对应的这个是真实的物理页, 我们这里保存一份, 省的在memory_set 里面查找了
|
||||
base_size: user_sp, // 用户栈顶以下 是代码中的各种逻辑段+栈段, 应用地址空间中从0x0开始到用户栈结束一共包含多少字节, 所以大小就是截止到user_sp
|
||||
heap_bottom: user_sp, //
|
||||
program_brk: user_sp, //
|
||||
exit_code: 0,
|
||||
})
|
||||
}
|
||||
};
|
||||
|
||||
// prepare TrapContext in user space
|
||||
// 根据 trap_cx_ppn 构建 陷入 trap context 的结构体
|
||||
let trap_cx = task_control_block.inner_exclusive_access().get_trap_cx(); // 根据trap_cx_ppn得到真实的物理页的 trap context的地址
|
||||
*trap_cx = TrapContext::from( // 对 tcb 的 TrapContext 的物理页进行 修改,
|
||||
entry_point, // 在陷入完成后, 准备返回用户态执行的, 用户代码入口地址
|
||||
user_sp, // 用户栈, 这个栈的地址是虚拟地址
|
||||
KERNEL_SPACE.exclusive_access().token(), // 内核 satp 页表的寄存器信息
|
||||
kernel_stack_top, // 用户应用的内核栈顶 在内核空间的位置 (这个是根据appid 计算出来的, 也只能在内核的地址空间中才能根据这个地址 看到相关的栈)
|
||||
trap_handler as usize, // 内核中 trap handler的入口点虚拟地址(恒等映射所以 这里也能找到)
|
||||
);
|
||||
task_control_block
|
||||
// 以上:
|
||||
// 任务控制块和 trap控制块, 分别多了一些字段
|
||||
// trap控制块(这个每次陷入都会被 sscratch 寄存器临时保存):
|
||||
// 多的三个字段 首次写入后, 后续只会读取和恢复,不会被再次写入新值, 这是为了
|
||||
// kernel_satp 内核空间页表所在位置的实际物理地址, 这个值以后会在切换的时候替换到satp寄存器
|
||||
// kernel_sp, 这个保存这个应用 他 根据appid计算出来 所持有的任务内核栈, 在jump context之前 会恢复
|
||||
// trap_handler 这是在内核在陷入的时候, 我们自定义的 trap_handle 的地址, 在陷入保存完寄存器之后, 需要 jmp 到这个函数地址
|
||||
// task 控制块 TCB, 这个是在内核进行 switch时的上下文结构:
|
||||
// memory_set 表示当前任务他的地址空间
|
||||
// trap_cx_ppn 用来保存 上方 trap控制块的 实际的物理页帧, 在用户空间中都被应设在了TRAP_CONTEXT相关的次高位置虚拟地址处, 在内核空间我们这保存一份实际的物理地址, 在内核空间读取这个通过恒等映射就得到任务的 trap context
|
||||
// base_size 用户栈顶距离0x0的距离, 即用户应用已知的大小
|
||||
//
|
||||
}
|
||||
|
||||
// 从当前进程copy 一个子进程, 他和父进程有相同的地址空间, 但是它拥有自己的内核栈 用来存放 trap_context
|
||||
// 子进程后续运行会 条入到 trap_return
|
||||
pub fn fork(self: &Arc<Self>) -> Arc<Self> {
|
||||
// ---- 当前进程的内容
|
||||
let mut parent_inner = self.inner_exclusive_access();
|
||||
|
||||
// 根据当前地址空间, copy 当前进程地址空间的数据到 一个新的地址空间
|
||||
let memory_set = MemorySet::from_existed_user(&parent_inner.memory_set);
|
||||
|
||||
// 找到新的进程地址空间中 TRAP_CONTEXT 的物理页
|
||||
let trap_cx_ppn = memory_set
|
||||
.page_table
|
||||
.get_pte(VirtAddr::from(TRAP_CONTEXT).into())
|
||||
.unwrap()
|
||||
.ppn();
|
||||
|
||||
// 分配一个pid
|
||||
let pid_handle = pid_alloc();
|
||||
// 根据pid 分配一个 子进程自己的内核栈
|
||||
let kernel_stack = KernelStack::from(&pid_handle);
|
||||
|
||||
// 创建tcb
|
||||
let kernel_stack_top = kernel_stack.get_top();
|
||||
let task_control_block = Arc::new(TaskControlBlock {
|
||||
pid: pid_handle,
|
||||
kernel_stack,
|
||||
inner: unsafe {
|
||||
UPSafeCell::new(TaskControlBlockInner {
|
||||
user_time: 0,
|
||||
kernel_time: 0,
|
||||
trap_cx_ppn,
|
||||
base_size: parent_inner.base_size,
|
||||
task_cx: TaskContext::goto_trap_return(kernel_stack_top),
|
||||
task_status: TaskStatus::Ready,
|
||||
memory_set,
|
||||
parent: Some(Arc::downgrade(self)), // 将父进程的弱引用计数 放到子进程的进程控制块中
|
||||
children: Vec::new(),
|
||||
exit_code: 0,
|
||||
heap_bottom: 0,
|
||||
program_brk: 0,
|
||||
})
|
||||
},
|
||||
});
|
||||
|
||||
|
||||
// add child
|
||||
// 添加子进程信息 到父进程中
|
||||
parent_inner.children.push(task_control_block.clone());
|
||||
|
||||
// 得到 tcb 当中 trap context 的可变引用, 上面复制时还是复制的父进程的
|
||||
// 现在修改其栈顶为我们新创建的 子进程自己的栈顶, 其他字段则是完全和父进程一样
|
||||
let trap_cx = task_control_block.inner_exclusive_access().get_trap_cx();
|
||||
trap_cx.kernel_sp = kernel_stack_top;
|
||||
|
||||
// return
|
||||
task_control_block
|
||||
// ---- release parent PCB automatically
|
||||
// **** release children PCB automatically
|
||||
}
|
||||
// TCB 加载一个新的应用, 从新的elf的 代码和数据替换 原有的旧的 应用地址空间的内容, 并开始执行
|
||||
// pid 和 kernel_stack 不变
|
||||
// 也不需要修改任务上下文环境, 因为只有被暂停的应用才需要再内核中保留一个任务上下文, 修改trap context 即可因
|
||||
pub fn exec(&self, elf_data: &[u8]) {
|
||||
// memory_set with elf program headers/trampoline/trap context/user stack
|
||||
// 根据 elf data 创建一个地址空间
|
||||
let (memory_set, user_sp, entry_point) = MemorySet::from_elf(elf_data);
|
||||
let trap_cx_ppn = memory_set
|
||||
.page_table
|
||||
.get_pte(VirtAddr::from(TRAP_CONTEXT).into())
|
||||
.unwrap()
|
||||
.ppn();
|
||||
|
||||
// **** access inner exclusively
|
||||
let mut inner = self.inner_exclusive_access();
|
||||
// substitute memory_set
|
||||
// 原有地址空间生命周期结束, 全部被回收
|
||||
inner.memory_set = memory_set;
|
||||
// 更新trap ppn
|
||||
inner.trap_cx_ppn = trap_cx_ppn;
|
||||
// 更新应用大小
|
||||
inner.base_size = user_sp;
|
||||
// 得到trap context 真实内存的指针
|
||||
let trap_cx = inner.get_trap_cx();
|
||||
*trap_cx = TrapContext::from(
|
||||
entry_point,
|
||||
user_sp,
|
||||
KERNEL_SPACE.exclusive_access().token(),
|
||||
self.kernel_stack.get_top(),
|
||||
trap_handler as usize,
|
||||
);
|
||||
// 作用域结束 释放inner
|
||||
// **** release inner automatically
|
||||
}
|
||||
}
|
||||
|
||||
impl TaskControlBlockInner{
|
||||
// 根据 trap context 的实际的物理地址, 强转为 TrapContext 结构体
|
||||
pub fn get_trap_cx(&self) -> &'static mut TrapContext {
|
||||
self.trap_cx_ppn.get_mut()
|
||||
}
|
||||
|
||||
pub fn get_user_token(&self) -> usize {
|
||||
self.memory_set.token()
|
||||
}
|
||||
|
||||
// 扩张/缩减, 当前应用的地址空间中的堆段, 指定字节的数据
|
||||
pub fn change_program_brk(&mut self, size: i32) -> Option<usize> {
|
||||
// 堆顶
|
||||
let old_break = self.program_brk;
|
||||
// 申请后新的堆顶
|
||||
let new_brk = self.program_brk as isize + size as isize;
|
||||
|
||||
// 如果新的堆顶 小于 堆底 直接返回(防止过度释放)
|
||||
if new_brk < self.heap_bottom as isize {
|
||||
return None;
|
||||
}
|
||||
|
||||
// 如果是小于0 说明需要释放,缩小堆的大小
|
||||
// 传入两个参数 堆底虚拟地址, 和 新的堆顶地址
|
||||
let result = if size < 0 {
|
||||
self.memory_set
|
||||
.shrink_to(VirtAddr(self.heap_bottom), VirtAddr(new_brk as usize))
|
||||
} else {
|
||||
self.memory_set
|
||||
.append_to(VirtAddr(self.heap_bottom), VirtAddr(new_brk as usize))
|
||||
};
|
||||
println!("size: {}, old_break: {}", size, old_break);
|
||||
// 如果成功就把新的堆顶的地址, 复制到结构提上记录, 并把旧的堆顶返回
|
||||
if result {
|
||||
self.program_brk = new_brk as usize;
|
||||
Some(old_break)
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,29 @@
|
||||
|
||||
use riscv::register::time;
|
||||
use crate::config::CLOCK_FREQ;
|
||||
use crate::sbi::set_timer;
|
||||
|
||||
const TICKS_PER_SEC: usize = 100;
|
||||
const MICRO_PER_SEC: usize = 1_000_000;
|
||||
const MSEC_PER_SEC: usize = 1_000;
|
||||
|
||||
//
|
||||
pub fn get_time() -> usize {
|
||||
time::read()
|
||||
}
|
||||
|
||||
// 读取mtime的值, 然后使用 (当前每秒的频率 / TICKS_PER_SEC 100) = 得到 10ms的数值的增量, 相加得到下一个下10ms 后mtime应该属于的值
|
||||
// 并设置mtimecmp, 这样在10ms后就会发出一个S特权的时钟中断
|
||||
pub fn set_next_trigger() {
|
||||
set_timer(get_time() + CLOCK_FREQ / TICKS_PER_SEC);
|
||||
}
|
||||
|
||||
// 以微秒为单位, 返回当前计数器经过的微秒
|
||||
// 当前 (计时器的值的总数 / 频率) = 计时器中经过了多少秒, (计时器的值的总数 / 频率) * 1_000_000 得到微秒(1秒有1_000_000微秒)
|
||||
pub fn get_time_us() -> usize {
|
||||
time::read() / (CLOCK_FREQ / MICRO_PER_SEC)
|
||||
}
|
||||
|
||||
pub fn get_time_ms() -> usize {
|
||||
time::read() / (CLOCK_FREQ / MSEC_PER_SEC)
|
||||
}
|
@ -0,0 +1,50 @@
|
||||
use riscv::register::sstatus::{self, Sstatus, SPP};
|
||||
|
||||
/// Trap Context
|
||||
#[repr(C)]
|
||||
pub struct TrapContext {
|
||||
/// 保存了 [0..31] 号寄存器, 其中0/2/4 号寄存器我们不保存, 2有特殊用途
|
||||
/// > 其中 [17] 号寄存器保存的是系统调用号
|
||||
///
|
||||
/// > [10]/[11]/[12] 寄存器保存了系统调用时的3个参数
|
||||
///
|
||||
/// > [2] 号寄存器因为我们有特殊用途所以也跳过保存, (保存了用户栈)保存了用户 USER_STACK 的 栈顶
|
||||
///
|
||||
/// > [0] 被硬编码为了0, 不会有变化, 不需要做任何处理
|
||||
///
|
||||
/// > [4] 除非特殊用途使用它, 一般我们也用不到, 不需要做任何处理
|
||||
pub x: [usize; 32],
|
||||
/// CSR sstatus 保存的是在trap发生之前, cpu处在哪一个特权级
|
||||
pub sstatus: Sstatus,
|
||||
/// CSR sepc 保存的是用户态ecall时 所在的那一行的代码
|
||||
pub sepc: usize,
|
||||
/// Addr of Page Table
|
||||
pub kernel_satp: usize, // 内核页的起始物理地址, 首次写入后, 后续只会读取和恢复,不会被再次写入新值
|
||||
/// kernel stack
|
||||
pub kernel_sp: usize, // 当前任务的内核栈顶的虚拟地址
|
||||
/// Addr of trap_handler function
|
||||
pub trap_handler: usize, // 陷入处理函数的地址虚拟地址
|
||||
}
|
||||
|
||||
impl TrapContext {
|
||||
/// 把用户栈的栈顶 保存到 [2]
|
||||
pub fn set_sp(&mut self, sp: usize) {
|
||||
self.x[2] = sp;
|
||||
}
|
||||
|
||||
// 根据entry和sp构造一个 trap_context
|
||||
pub fn from(entry: usize, sp: usize, kernel_satp: usize, kernel_sp: usize, trap_handler: usize,) -> Self {
|
||||
let mut sstatus = sstatus::read(); // 读取CSR sstatus
|
||||
sstatus.set_spp(SPP::User); // 设置特权级为用户模式
|
||||
let mut cx = Self {
|
||||
x: [0; 32],
|
||||
sstatus,
|
||||
sepc: entry, // 设置代码执行的开头, 将来条入到这里执行
|
||||
kernel_satp,
|
||||
kernel_sp,
|
||||
trap_handler,
|
||||
};
|
||||
cx.set_sp(sp); // 设置用户栈的栈顶
|
||||
cx // 返回, 外面会恢复完 x[0; 32] 之后最后 sret 根据entry和sstatus 返回
|
||||
}
|
||||
}
|
@ -0,0 +1,140 @@
|
||||
mod context;
|
||||
|
||||
use core::arch::{asm, global_asm};
|
||||
use riscv::register::{mtvec::TrapMode, scause::{self, Exception, Trap}, sie, stval, stvec};
|
||||
use riscv::register::scause::Interrupt;
|
||||
|
||||
pub use context::TrapContext;
|
||||
use crate::config::{TRAMPOLINE, TRAP_CONTEXT};
|
||||
use crate::println;
|
||||
use crate::syscall::syscall;
|
||||
use crate::task::{exit_current_and_run_next, suspend_current_and_run_next};
|
||||
use crate::timer::set_next_trigger;
|
||||
use crate::task::manager::TASK_MANAGER;
|
||||
use crate::task::processor::{current_task, current_trap_cx, current_user_token, kernel_time_start, user_time_start};
|
||||
|
||||
|
||||
|
||||
// 引入陷入保存寄存器需要的汇编代码
|
||||
global_asm!(include_str!("trap.S"));
|
||||
|
||||
/// 初始化stvec 寄存器, 这个寄存器保存陷入时, 入口函数的地址
|
||||
pub fn init() {
|
||||
set_kernel_trap_entry();
|
||||
}
|
||||
|
||||
// 设置riscv 允许定时器中断
|
||||
pub fn enable_timer_interrupt() {
|
||||
unsafe {
|
||||
sie::set_stimer();
|
||||
}
|
||||
}
|
||||
|
||||
// 这个函数是 trap.S 中__alltraps 保存完所有寄存器在内核栈 之后会进入到这里
|
||||
#[no_mangle]
|
||||
pub fn trap_handler() -> ! {
|
||||
// 已经进入内核, 如果再发生中断我们进行的设置, 目前是直接跳转到一个引发panic 的函数
|
||||
set_kernel_trap_entry();
|
||||
|
||||
// 进入到了内核态, 需要把之前的用户消耗时间统计在用户时间上
|
||||
kernel_time_start();
|
||||
|
||||
// 得到当前用户应用 的 trap context, 需要调用一个函数, 因为用户应用的trap context 不再内核空间, 他是在用户空间的次高地址
|
||||
let cx = current_trap_cx();
|
||||
|
||||
let scause = scause::read(); // trap 发生的原因
|
||||
let stval = stval::read(); // trap的附加信息
|
||||
// 根据发生的原因判断是那种类别
|
||||
match scause.cause() {
|
||||
// 用户态发出的系统调用
|
||||
Trap::Exception(Exception::UserEnvCall) => {
|
||||
cx.sepc += 4; // +4 是因为我们需要返回 ecall指令的下一个指令
|
||||
cx.x[10] = syscall(cx.x[17], [cx.x[10], cx.x[11], cx.x[12]]) as usize;
|
||||
}
|
||||
// 访问不允许的内存
|
||||
Trap::Exception(Exception::StoreFault)
|
||||
| Trap::Exception(Exception::StorePageFault)
|
||||
| Trap::Exception(Exception::LoadFault)
|
||||
| Trap::Exception(Exception::LoadPageFault) => {
|
||||
println!("[kernel] PageFault in application, kernel killed it.");
|
||||
exit_current_and_run_next(-2);
|
||||
}
|
||||
// 非法指令
|
||||
Trap::Exception(Exception::IllegalInstruction) => {
|
||||
println!("[kernel] IllegalInstruction in application, kernel killed it.");
|
||||
exit_current_and_run_next(-3);
|
||||
}
|
||||
Trap::Interrupt(Interrupt::SupervisorTimer) => {
|
||||
// 发生时钟中断之后, 继续设置下一个时钟中断的发起时间
|
||||
set_next_trigger();
|
||||
// 暂停当前任务, 切换新的任务
|
||||
suspend_current_and_run_next();
|
||||
}
|
||||
// 未知错误
|
||||
_ => {
|
||||
panic!(
|
||||
"Unsupported trap {:?}, stval = {:#x}!",
|
||||
scause.cause(),
|
||||
stval
|
||||
);
|
||||
}
|
||||
}
|
||||
// 即将进入用户态, 把内核使用的时间统计在内核时间上
|
||||
user_time_start();
|
||||
trap_return()
|
||||
}
|
||||
|
||||
|
||||
#[no_mangle]
|
||||
/// Unimplement: traps/interrupts/exceptions from kernel mode
|
||||
/// Todo: Chapter 9: I/O device
|
||||
pub fn trap_from_kernel() -> ! {
|
||||
panic!("a trap from kernel!");
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
/// set the new addr of __restore asm function in TRAMPOLINE page,
|
||||
/// set the reg a0 = trap_cx_ptr, reg a1 = phy addr of usr page table,
|
||||
/// finally, jump to new addr of __restore asm function
|
||||
pub fn trap_return() -> ! {
|
||||
// 设置 用户态的中断处理函数
|
||||
set_user_trap_entry();
|
||||
|
||||
let trap_cx_ptr = TRAP_CONTEXT; // 用户空间虚拟地址的次高页, 保存了trap context, 在返回用户空间的时候, 需要恢复trap context中保存的寄存器信息
|
||||
let user_satp = current_user_token(); // 当前用户应用的 页表所在的地址 需要在trap.S中, 等下恢复完寄存器之后 修改的用户应用自己的页表
|
||||
extern "C" {
|
||||
fn __alltraps();
|
||||
fn __restore();
|
||||
}
|
||||
// TRAMPOLINE + (__restore - __alltraps), 得到的就是用户空间中 虚拟地址跳板的位置, 增加一个 (__alltraps低地址 到 __restore高地址的偏移值), 就得到了 strampoline -> __restore 的虚拟地址
|
||||
let restore_va = __restore as usize - __alltraps as usize + TRAMPOLINE;
|
||||
|
||||
|
||||
unsafe {
|
||||
asm!(
|
||||
"fence.i", // 清空 i-cache
|
||||
"jr {restore_va}", // 跳转到 strampoline -> __restore 地址
|
||||
restore_va = in(reg) restore_va,
|
||||
in("a0") trap_cx_ptr, // a0 = virt addr of Trap Context
|
||||
in("a1") user_satp, // a1 = phy addr of usr page table
|
||||
options(noreturn)
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
fn set_kernel_trap_entry() {
|
||||
// 设置内核法中 trap 的处理
|
||||
// 当前我们直接panic
|
||||
unsafe {
|
||||
stvec::write(trap_from_kernel as usize, TrapMode::Direct);
|
||||
}
|
||||
}
|
||||
|
||||
fn set_user_trap_entry() {
|
||||
// 设置 用户态的中断处理函数, 为我们的跳板, 这个跳板在用户空间的虚拟地址最高页, 虚拟地址最高页被映射在了十几物理内存的trap 处理函数所在的段执行__alltraps
|
||||
unsafe {
|
||||
stvec::write(TRAMPOLINE as usize, TrapMode::Direct);
|
||||
}
|
||||
}
|
||||
|
@ -0,0 +1,13 @@
|
||||
[package]
|
||||
name = "user_lib"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
riscv = { git = "https://github.com/rcore-os/riscv", features = ["inline-asm"] }
|
||||
buddy_system_allocator = "0.6"
|
||||
|
||||
[profile.release]
|
||||
debug = true
|
@ -0,0 +1,28 @@
|
||||
MODE := release
|
||||
TARGET := riscv64gc-unknown-none-elf
|
||||
OBJDUMP := rust-objdump --arch-name=riscv64
|
||||
OBJCOPY := rust-objcopy --binary-architecture=riscv64
|
||||
|
||||
RUST_FLAGS := -Clink-arg=-Tsrc/linker.ld # 使用我们自己的链接脚本
|
||||
RUST_FLAGS += -Cforce-frame-pointers=yes # 强制编译器生成帧指针
|
||||
RUST_FLAGS:=$(strip ${RUST_FLAGS})
|
||||
|
||||
APP_DIR := src/bin
|
||||
TARGET_DIR := target/$(TARGET)/$(MODE)
|
||||
APPS := $(wildcard $(APP_DIR)/*.rs)
|
||||
ELFS := $(patsubst $(APP_DIR)/%.rs, $(TARGET_DIR)/%, $(APPS))
|
||||
BINS := $(patsubst $(APP_DIR)/%.rs, $(TARGET_DIR)/%.bin, $(APPS))
|
||||
|
||||
|
||||
# 编译elf文件
|
||||
build_elf: clean
|
||||
CARGO_BUILD_RUSTFLAGS="$(RUST_FLAGS)" \
|
||||
cargo build --$(MODE) --target=$(TARGET)
|
||||
|
||||
|
||||
# 把每个elf文件去掉无关代码
|
||||
build: build_elf
|
||||
|
||||
|
||||
clean:
|
||||
#rm -rf ./target*
|
@ -0,0 +1,28 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use user_lib::*;
|
||||
|
||||
const LEN: usize = 100;
|
||||
|
||||
static mut S: [u64; LEN] = [0u64; LEN];
|
||||
|
||||
#[no_mangle]
|
||||
unsafe fn main() -> i32 {
|
||||
let p = 3u64;
|
||||
let m = 998244353u64;
|
||||
let iter: usize = 300000;
|
||||
let mut cur = 0usize;
|
||||
S[cur] = 1;
|
||||
for i in 1..=iter {
|
||||
let next = if cur + 1 == LEN { 0 } else { cur + 1 };
|
||||
S[next] = S[cur] * p % m;
|
||||
cur = next;
|
||||
if i % 10000 == 0 {
|
||||
println!("power_3 [{}/{}]", i, iter);
|
||||
}
|
||||
}
|
||||
println!("{}^{} = {}(MOD {})", p, iter, S[cur], m);
|
||||
println!("Test power_3 OK!");
|
||||
0
|
||||
}
|
@ -0,0 +1,28 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use user_lib::*;
|
||||
|
||||
const LEN: usize = 100;
|
||||
|
||||
static mut S: [u64; LEN] = [0u64; LEN];
|
||||
|
||||
#[no_mangle]
|
||||
unsafe fn main() -> i32 {
|
||||
let p = 5u64;
|
||||
let m = 998244353u64;
|
||||
let iter: usize = 210000;
|
||||
let mut cur = 0usize;
|
||||
S[cur] = 1;
|
||||
for i in 1..=iter {
|
||||
let next = if cur + 1 == LEN { 0 } else { cur + 1 };
|
||||
S[next] = S[cur] * p % m;
|
||||
cur = next;
|
||||
if i % 10000 == 0 {
|
||||
println!("power_5 [{}/{}]", i, iter);
|
||||
}
|
||||
}
|
||||
println!("{}^{} = {}(MOD {})", p, iter, S[cur], m);
|
||||
println!("Test power_5 OK!");
|
||||
0
|
||||
}
|
@ -0,0 +1,19 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
extern crate alloc;
|
||||
|
||||
use alloc::vec::Vec;
|
||||
use user_lib::*;
|
||||
use user_lib::syscall::*;
|
||||
|
||||
#[no_mangle]
|
||||
fn main() -> i32 {
|
||||
let current_timer = sys_get_time();
|
||||
let wait_for = current_timer + 3000;
|
||||
while sys_get_time() < wait_for {
|
||||
sys_yield();
|
||||
}
|
||||
println!("Test sleep OK!");
|
||||
0
|
||||
}
|
@ -0,0 +1,65 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use core::ptr::slice_from_raw_parts_mut;
|
||||
use user_lib::*;
|
||||
use user_lib::syscall::sys_sbrk;
|
||||
|
||||
#[no_mangle]
|
||||
fn main() -> i32 {
|
||||
println!("Test sbrk start.");
|
||||
|
||||
// 设置申请颗粒度
|
||||
const PAGE_SIZE: usize = 0x1000;
|
||||
|
||||
// 查看当前堆 end
|
||||
let origin_brk = sys_sbrk(0);
|
||||
println!("origin break point = {:x}", origin_brk);
|
||||
|
||||
// 申请一页
|
||||
let brk = sys_sbrk(PAGE_SIZE as i32);
|
||||
if brk != origin_brk {
|
||||
return -1;
|
||||
}
|
||||
|
||||
// 申请一页之后 查看堆 end
|
||||
let brk = sys_sbrk(0);
|
||||
println!("one page allocated, break point = {:x}", brk);
|
||||
println!("try write to allocated page");
|
||||
|
||||
// 得到 申请的堆 的字节数组, 并写入为1
|
||||
let new_page = unsafe {
|
||||
&mut *slice_from_raw_parts_mut(origin_brk as usize as *const u8 as *mut u8, PAGE_SIZE)
|
||||
};
|
||||
for pos in 0..PAGE_SIZE {
|
||||
new_page[pos] = 1;
|
||||
}
|
||||
println!("write ok");
|
||||
|
||||
// 再申请10页内存 并得到当前 堆end
|
||||
sys_sbrk(PAGE_SIZE as i32 * 10);
|
||||
let brk = sys_sbrk(0);
|
||||
println!("10 page allocated, break point = {:x}", brk);
|
||||
|
||||
// 释放 11页(之前已经申请了 1 + 10页了)
|
||||
sys_sbrk(PAGE_SIZE as i32 * -11);
|
||||
let brk = sys_sbrk(0);
|
||||
println!("11 page DEALLOCATED, break point = {:x}", brk);
|
||||
println!("try DEALLOCATED more one page, should be failed.");
|
||||
|
||||
// 继续释放1页, 非法释放的测试
|
||||
let ret = sys_sbrk(PAGE_SIZE as i32 * -1);
|
||||
if ret != -1 {
|
||||
println!("Test sbrk failed!");
|
||||
return -1;
|
||||
}
|
||||
|
||||
println!("Test sbrk almost OK!");
|
||||
println!("now write to deallocated page, should cause page fault.");
|
||||
for pos in 0..PAGE_SIZE {
|
||||
new_page[pos] = 2;
|
||||
}
|
||||
println!("{:?}", new_page);
|
||||
// 不应该走到这里
|
||||
0
|
||||
}
|
@ -0,0 +1,29 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
|
||||
|
||||
use user_lib::*;
|
||||
use syscall::{sys_fork, };
|
||||
use user_lib::syscall::sys_getpid;
|
||||
|
||||
#[no_mangle]
|
||||
pub fn main() -> i32 {
|
||||
assert_eq!(wait(&mut 0i32), -1);
|
||||
println!("sys_wait without child process test passed!");
|
||||
println!("parent start, pid = {}!", sys_getpid());
|
||||
let pid = sys_fork();
|
||||
if pid == 0 {
|
||||
// child process
|
||||
println!("hello child process!");
|
||||
100
|
||||
} else {
|
||||
// parent process
|
||||
let mut exit_code: i32 = 0;
|
||||
println!("ready waiting on parent process!");
|
||||
assert_eq!(pid, wait(&mut exit_code));
|
||||
assert_eq!(exit_code, 100);
|
||||
println!("child process pid = {}, exit code = {}", pid, exit_code);
|
||||
0
|
||||
}
|
||||
}
|
@ -0,0 +1,36 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use user_lib::*;
|
||||
use syscall::{sys_fork, sys_getpid, sys_yield};
|
||||
use user_lib::syscall::sys_exit;
|
||||
|
||||
const DEPTH: usize = 4;
|
||||
|
||||
fn fork_child(cur: &str, branch: char) {
|
||||
let mut next = [0u8; DEPTH + 1];
|
||||
let l = cur.len();
|
||||
if l >= DEPTH {
|
||||
return;
|
||||
}
|
||||
next[..l].copy_from_slice(cur.as_bytes());
|
||||
next[l] = branch as u8;
|
||||
if sys_fork() == 0 {
|
||||
fork_tree(core::str::from_utf8(&next[..l + 1]).unwrap());
|
||||
sys_yield();
|
||||
sys_exit(0);
|
||||
}
|
||||
}
|
||||
|
||||
fn fork_tree(cur: &str) {
|
||||
println!("pid{}: {}", sys_getpid(), cur);
|
||||
fork_child(cur, '0');
|
||||
fork_child(cur, '1');
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub fn main() -> i32 {
|
||||
fork_tree("");
|
||||
sleep(3000);
|
||||
0
|
||||
}
|
@ -0,0 +1,31 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
|
||||
use user_lib::syscall::{sys_fork, sys_yield, sys_exec};
|
||||
use user_lib::{println, wait};
|
||||
|
||||
#[no_mangle]
|
||||
fn main() -> i32 {
|
||||
if sys_fork() == 0 {
|
||||
// 注意需要手动添加\0 转为 c_str
|
||||
// 启动我们的shell程序
|
||||
sys_exec("user_shell\0");
|
||||
} else {
|
||||
// 所有的进程 最后父进程都会是 initproc进程, 所以我们这里一直等待 子进程是否结束
|
||||
// 持续调用wait 进行等待,
|
||||
loop {
|
||||
let mut exit_code: i32 = 0;
|
||||
let pid = wait(&mut exit_code);
|
||||
//如果 没有进程被回收 则让出cpu, 开始下一轮循环
|
||||
if pid == -1 {
|
||||
sys_yield();
|
||||
continue;
|
||||
}
|
||||
println!(
|
||||
"[initproc] Released a zombie process, pid={}, exit_code={}",
|
||||
pid, exit_code,
|
||||
);
|
||||
}
|
||||
}
|
||||
0
|
||||
}
|
@ -0,0 +1,70 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
#![allow(clippy::needless_range_loop)]
|
||||
|
||||
use user_lib::*;
|
||||
use syscall::{sys_fork, sys_getpid, sys_yield};
|
||||
use user_lib::syscall::{sys_exit, sys_get_time};
|
||||
|
||||
|
||||
static NUM: usize = 30;
|
||||
const N: usize = 10;
|
||||
static P: i32 = 10007;
|
||||
type Arr = [[i32; N]; N];
|
||||
|
||||
fn work(times: isize) {
|
||||
let mut a: Arr = Default::default();
|
||||
let mut b: Arr = Default::default();
|
||||
let mut c: Arr = Default::default();
|
||||
for i in 0..N {
|
||||
for j in 0..N {
|
||||
a[i][j] = 1;
|
||||
b[i][j] = 1;
|
||||
}
|
||||
}
|
||||
sys_yield();
|
||||
println!("pid {} is running ({} times)!.", sys_getpid(), times);
|
||||
for _ in 0..times {
|
||||
for i in 0..N {
|
||||
for j in 0..N {
|
||||
c[i][j] = 0;
|
||||
#[allow(clippy::needless_range_loop)]
|
||||
for k in 0..N {
|
||||
c[i][j] = (c[i][j] + a[i][k] * b[k][j]) % P;
|
||||
}
|
||||
}
|
||||
}
|
||||
for i in 0..N {
|
||||
for j in 0..N {
|
||||
a[i][j] = c[i][j];
|
||||
b[i][j] = c[i][j];
|
||||
}
|
||||
}
|
||||
}
|
||||
println!("pid {} done!.", sys_getpid());
|
||||
sys_exit(0);
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub fn main() -> i32 {
|
||||
for _ in 0..NUM {
|
||||
let pid = sys_fork();
|
||||
if pid == 0 {
|
||||
let current_time = sys_get_time();
|
||||
let times = (current_time as i32 as isize) * (current_time as i32 as isize) % 1000;
|
||||
work(times * 10);
|
||||
}
|
||||
}
|
||||
|
||||
println!("fork ok.");
|
||||
|
||||
let mut exit_code: i32 = 0;
|
||||
for _ in 0..NUM {
|
||||
if wait(&mut exit_code) < 0 {
|
||||
panic!("wait failed.");
|
||||
}
|
||||
}
|
||||
assert!(wait(&mut exit_code) < 0);
|
||||
println!("matrix passed.");
|
||||
0
|
||||
}
|
@ -0,0 +1,72 @@
|
||||
#![no_std]
|
||||
#![no_main]
|
||||
#![allow(clippy::println_empty_string)]
|
||||
|
||||
extern crate alloc;
|
||||
|
||||
const LF: u8 = 0x0au8;
|
||||
const CR: u8 = 0x0du8;
|
||||
const DL: u8 = 0x7fu8;
|
||||
const BS: u8 = 0x08u8;
|
||||
|
||||
use alloc::string::String;
|
||||
use user_lib::{ print, println, waitpid};
|
||||
use user_lib::syscall::{sys_exec, sys_yield, sys_fork, sys_get_time};
|
||||
use user_lib::user_console::getchar;
|
||||
|
||||
|
||||
#[no_mangle]
|
||||
pub fn main() -> i32 {
|
||||
println!("Rust user shell");
|
||||
|
||||
// line变量 维护着当前输入的内容, 它不断发生变化
|
||||
let mut line: String = String::new();
|
||||
print!(">> ");
|
||||
loop {
|
||||
// 循环读取标准输入
|
||||
let c = getchar();
|
||||
|
||||
match c {
|
||||
// 如果是 回车键, 开启一个新的进程, 把 line中的内容 使用exec 执行
|
||||
LF | CR => {
|
||||
println!("");
|
||||
if !line.is_empty() {
|
||||
line.push('\0');
|
||||
let mut st = sys_get_time();
|
||||
|
||||
let pid = sys_fork();
|
||||
if pid == 0 {
|
||||
// child process
|
||||
if sys_exec(line.as_str()) == -1 {
|
||||
// 返回 -1 说明没有存在 line中的程序
|
||||
println!("Error when executing!");
|
||||
return -4;
|
||||
}
|
||||
unreachable!();
|
||||
} else {
|
||||
// 等待上方子进程结束
|
||||
let mut exit_code: i32 = 0;
|
||||
let exit_pid = waitpid(pid as usize, &mut exit_code);
|
||||
assert_eq!(pid, exit_pid);
|
||||
println!("Shell: Process {} exited with code {}, use time: {}ms", pid, exit_code, sys_get_time()-st);
|
||||
}
|
||||
line.clear();
|
||||
}
|
||||
print!(">> ");
|
||||
}
|
||||
// 如果是退格键
|
||||
BS | DL => {
|
||||
if !line.is_empty() {
|
||||
print!("{}", BS as char);
|
||||
print!(" ");
|
||||
print!("{}", BS as char);
|
||||
line.pop();
|
||||
}
|
||||
}
|
||||
_ => {
|
||||
print!("{}", c as char);
|
||||
line.push(c as char);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
@ -0,0 +1,74 @@
|
||||
#![no_std]
|
||||
#![feature(linkage)] // 开启弱链接特性
|
||||
#![feature(panic_info_message)]
|
||||
|
||||
|
||||
pub mod user_lang_items;
|
||||
pub use user_lang_items::*;
|
||||
|
||||
pub mod syscall;
|
||||
use syscall::*;
|
||||
use buddy_system_allocator::LockedHeap;
|
||||
|
||||
const USER_HEAP_SIZE: usize = 16384;
|
||||
static mut HEAP_SPACE: [u8; USER_HEAP_SIZE] = [0; USER_HEAP_SIZE];
|
||||
|
||||
// 用户应用的分配器
|
||||
#[global_allocator]
|
||||
static HEAP: LockedHeap = LockedHeap::empty();
|
||||
|
||||
|
||||
// 只要使用这个包, 那么这里就会作为bin程序的开始
|
||||
#[no_mangle]
|
||||
#[link_section = ".text.entry"] // 链接到指定的段
|
||||
pub extern "C" fn _start() -> ! {
|
||||
unsafe {
|
||||
HEAP.lock()
|
||||
.init(HEAP_SPACE.as_ptr() as usize, USER_HEAP_SIZE);
|
||||
}
|
||||
|
||||
sys_exit(main()); // 这里执行的main程序是我们 bin文件夹里面的main, 而不是下面的, 下面的main程序只有在bin程序没有main函数的时候才会链接
|
||||
// 正常是不会走到这一步的, 因为上面已经退出了程序
|
||||
panic!("unreachable after sys_exit!");
|
||||
}
|
||||
|
||||
#[linkage = "weak"] // 设置我们默认的main函数, 弱链接
|
||||
#[no_mangle]
|
||||
fn main() -> i32 {
|
||||
panic!("Cannot find main!");
|
||||
}
|
||||
|
||||
// sys_waitpid如果传的是-1 则表示任何子进程退出都可以,
|
||||
pub fn wait(exit_code: &mut i32) -> isize {
|
||||
loop {
|
||||
match sys_waitpid(-1, exit_code as *mut _) {
|
||||
// 如果返回-2, 说明还没有僵尸进程, 那就下一轮loop循环继续等待
|
||||
-2 => {
|
||||
sys_yield();
|
||||
}
|
||||
// 如果返回 -1 说明有任意进程结束
|
||||
// -1 or a real pid
|
||||
exit_pid => return exit_pid,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 只检测指定pid的进程是否结束
|
||||
pub fn waitpid(pid: usize, exit_code: &mut i32) -> isize {
|
||||
loop {
|
||||
match sys_waitpid(pid as isize, exit_code as *mut _) {
|
||||
-2 => {
|
||||
sys_yield();
|
||||
}
|
||||
// -1 or a real pid
|
||||
exit_pid => return exit_pid,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn sleep(period_ms: usize) {
|
||||
let start = sys_get_time();
|
||||
while sys_get_time() < start + period_ms as isize {
|
||||
sys_yield();
|
||||
}
|
||||
}
|
@ -0,0 +1,32 @@
|
||||
|
||||
OUTPUT_ARCH(riscv)
|
||||
ENTRY(_start)
|
||||
|
||||
BASE_ADDRESS = 0x10000;
|
||||
|
||||
SECTIONS
|
||||
{
|
||||
. = BASE_ADDRESS;
|
||||
.text : {
|
||||
*(.text.entry)
|
||||
*(.text .text.*)
|
||||
}
|
||||
. = ALIGN(4K);
|
||||
.rodata : {
|
||||
*(.rodata .rodata.*)
|
||||
*(.srodata .srodata.*)
|
||||
}
|
||||
. = ALIGN(4K);
|
||||
.data : {
|
||||
*(.data .data.*)
|
||||
*(.sdata .sdata.*)
|
||||
}
|
||||
.bss : {
|
||||
*(.bss .bss.*)
|
||||
*(.sbss .sbss.*)
|
||||
}
|
||||
/DISCARD/ : {
|
||||
*(.eh_frame)
|
||||
*(.debug*)
|
||||
}
|
||||
}
|
@ -0,0 +1,72 @@
|
||||
use core::arch::asm;
|
||||
|
||||
const SYSCALL_READ: usize = 63;
|
||||
const SYSCALL_WRITE: usize = 64;
|
||||
const SYSCALL_EXIT: usize = 93;
|
||||
const SYSCALL_YIELD: usize = 124;
|
||||
const SYSCALL_GET_TIME: usize = 169;
|
||||
const SYSCALL_SBRK: usize = 214;
|
||||
const SYSCALL_GETPID: usize = 172;
|
||||
const SYSCALL_FORK: usize = 220;
|
||||
const SYSCALL_EXEC: usize = 221;
|
||||
const SYSCALL_WAITPID: usize = 260;
|
||||
|
||||
|
||||
fn syscall(id: usize, args: [usize; 3]) -> isize {
|
||||
let mut ret: isize;
|
||||
unsafe {
|
||||
// a0寄存器同时作为输入参数和输出参数, {in_var} => {out_var}
|
||||
asm!(
|
||||
"ecall",
|
||||
inlateout("x10") args[0] => ret,
|
||||
in("x11") args[1],
|
||||
in("x12") args[2],
|
||||
in("x17") id
|
||||
);
|
||||
}
|
||||
ret
|
||||
}
|
||||
|
||||
|
||||
pub fn sys_write(fd: usize, buffer: &[u8]) -> isize {
|
||||
syscall(SYSCALL_WRITE, [fd, buffer.as_ptr() as usize, buffer.len()])
|
||||
}
|
||||
|
||||
pub fn sys_exit(exit_code: i32) -> isize {
|
||||
syscall(SYSCALL_EXIT, [exit_code as usize, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_yield() {
|
||||
syscall(SYSCALL_YIELD, [0, 0, 0]);
|
||||
}
|
||||
|
||||
pub fn sys_get_time() -> isize {
|
||||
syscall(SYSCALL_GET_TIME, [0, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_sbrk(size: i32) -> isize {
|
||||
syscall(SYSCALL_SBRK, [size as usize, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_getpid() -> isize {
|
||||
syscall(SYSCALL_GETPID, [0, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_fork() -> isize {
|
||||
syscall(SYSCALL_FORK, [0, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_exec(path: &str) -> isize {
|
||||
syscall(SYSCALL_EXEC, [path.as_ptr() as usize, 0, 0])
|
||||
}
|
||||
|
||||
pub fn sys_waitpid(pid: isize, exit_code: *mut i32) -> isize {
|
||||
syscall(SYSCALL_WAITPID, [pid as usize, exit_code as usize, 0])
|
||||
}
|
||||
|
||||
pub fn sys_read(fd: usize, buffer: &mut [u8]) -> isize {
|
||||
syscall(
|
||||
SYSCALL_READ,
|
||||
[fd, buffer.as_mut_ptr() as usize, buffer.len()],
|
||||
)
|
||||
}
|
@ -0,0 +1,2 @@
|
||||
pub mod user_panic;
|
||||
pub mod user_console;
|
@ -0,0 +1,41 @@
|
||||
use core::fmt::{Arguments, Write, Result};
|
||||
use crate::syscall::{sys_read, sys_write};
|
||||
|
||||
struct Stdout;
|
||||
|
||||
const STDIN: usize = 0; // 读取 标准输入的标志
|
||||
const STDOUT: usize = 1;
|
||||
|
||||
impl Write for Stdout {
|
||||
fn write_str(&mut self, s: &str) -> Result {
|
||||
sys_write(STDOUT, s.as_bytes());
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// 每次从标准输入读出一个字符, 这个会阻塞当前进程
|
||||
pub fn getchar() -> u8 {
|
||||
let mut c = [0u8; 1];
|
||||
sys_read(STDIN, &mut c);
|
||||
c[0]
|
||||
}
|
||||
|
||||
|
||||
pub fn print(args: Arguments) {
|
||||
Stdout.write_fmt(args).unwrap();
|
||||
}
|
||||
|
||||
|
||||
#[macro_export]
|
||||
macro_rules! print {
|
||||
($fmt: literal $(, $($arg: tt)+)?) => {
|
||||
$crate::user_console::print(format_args!($fmt $(, $($arg)+)?));
|
||||
}
|
||||
}
|
||||
|
||||
#[macro_export]
|
||||
macro_rules! println {
|
||||
($fmt: literal $(, $($arg: tt)+)?) => {
|
||||
$crate::user_console::print(format_args!(concat!($fmt, "\n") $(, $($arg)+)?));
|
||||
}
|
||||
}
|
@ -0,0 +1,19 @@
|
||||
use core::panic::PanicInfo;
|
||||
use crate::println;
|
||||
|
||||
#[panic_handler]
|
||||
fn panic(info: &PanicInfo) -> ! {
|
||||
if let Some(location) = info.location() {
|
||||
println!(
|
||||
"Panicked at {}:{} {}",
|
||||
location.file(),
|
||||
location.line(),
|
||||
info.message().unwrap()
|
||||
);
|
||||
} else {
|
||||
println!("Panicked: {}", info.message().unwrap());
|
||||
}
|
||||
loop {
|
||||
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue