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Refactor kernel virtual memory allocation for kernel stack and I/O memory

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This commit is contained in:
Wang Siyuan
2024-09-24 19:02:26 +00:00
committed by Tate, Hongliang Tian
parent 29eb37c07c
commit 998869d57e
11 changed files with 495 additions and 257 deletions
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26
ostd/src/task/kernel_stack.rs
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@ -2,8 +2,9 @@
use crate::{
mm::{
kspace::kva::Kva,
kspace::kvirt_area::{KVirtArea, Tracked},
page::{allocator, meta::KernelStackMeta},
page_prop::{CachePolicy, PageFlags, PageProperty, PrivilegedPageFlags},
PAGE_SIZE,
},
prelude::*,
@ -26,25 +27,30 @@ pub const DEFAULT_STACK_SIZE_IN_PAGES: u32 = 128;
pub static KERNEL_STACK_SIZE: usize = STACK_SIZE_IN_PAGES as usize * PAGE_SIZE;
#[derive(Debug)]
#[allow(dead_code)]
pub struct KernelStack {
kva: Kva,
kvirt_area: KVirtArea<Tracked>,
end_vaddr: Vaddr,
has_guard_page: bool,
}
impl KernelStack {
/// Generates a kernel stack with a guard page.
/// An additional page is allocated and be regarded as a guard page, which should not be accessed.
/// Generates a kernel stack with guard pages.
/// 4 additional pages are allocated and regarded as guard pages, which should not be accessed.
pub fn new_with_guard_page() -> Result<Self> {
let mut new_kva = Kva::new(KERNEL_STACK_SIZE + 4 * PAGE_SIZE);
let mapped_start = new_kva.range().start + 2 * PAGE_SIZE;
let mut new_kvirt_area = KVirtArea::<Tracked>::new(KERNEL_STACK_SIZE + 4 * PAGE_SIZE);
let mapped_start = new_kvirt_area.range().start + 2 * PAGE_SIZE;
let mapped_end = mapped_start + KERNEL_STACK_SIZE;
let pages = allocator::alloc(KERNEL_STACK_SIZE, |_| KernelStackMeta::default()).unwrap();
unsafe {
new_kva.map_pages(mapped_start..mapped_end, pages);
}
let prop = PageProperty {
flags: PageFlags::RW,
cache: CachePolicy::Writeback,
priv_flags: PrivilegedPageFlags::empty(),
};
new_kvirt_area.map_pages(mapped_start..mapped_end, pages.iter().cloned(), prop);
Ok(Self {
kva: new_kva,
kvirt_area: new_kvirt_area,
end_vaddr: mapped_end,
has_guard_page: true,
})