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pub const APP_BASE_ADDRESS: usize = 0x80400000; // 载入的app的起始的地址
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pub const APP_SIZE_LIMIT: usize = 0x20000; // app的最大的二进制文件能够使用的大小
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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 = 0x80800000; // 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 use crate::board::*;
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