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Mark all physical memory metadata with memory region info

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Zhang Junyang 2025-03-03 22:13:54 +08:00 committed by Tate, Hongliang Tian
parent 28e7c0ff1f
commit 6ed38f5cb0
3 changed files with 48 additions and 9 deletions
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5
ostd/src/boot/smp.rs
View File

@ -10,7 +10,10 @@ use spin::Once;
use crate::{
arch::boot::smp::{bringup_all_aps, get_num_processors},
cpu,
mm::{frame::Segment, kspace::KernelMeta, paddr_to_vaddr, FrameAllocOptions, PAGE_SIZE},
mm::{
frame::{meta::KernelMeta, Segment},
paddr_to_vaddr, FrameAllocOptions, PAGE_SIZE,
},
task::Task,
};

41
ostd/src/mm/frame/meta.rs
View File

@ -492,6 +492,8 @@ pub(crate) unsafe fn init() -> Segment<MetaPageMeta> {
let _ = ManuallyDrop::new(early_seg);
}
mark_unusable_ranges();
Segment::from_unused(meta_page_range, |_| MetaPageMeta {}).unwrap()
}
@ -535,6 +537,45 @@ fn alloc_meta_frames(tot_nr_frames: usize) -> (usize, Paddr) {
(nr_meta_pages, start_paddr)
}
/// The metadata of physical pages that cannot be allocated for general use.
#[derive(Debug)]
pub struct UnusableMemoryMeta;
impl_frame_meta_for!(UnusableMemoryMeta);
/// The metadata of physical pages that contains the kernel itself.
#[derive(Debug, Default)]
pub struct KernelMeta;
impl_frame_meta_for!(KernelMeta);
macro_rules! mark_ranges {
($region: expr, $typ: expr) => {{
debug_assert!($region.base() % PAGE_SIZE == 0);
debug_assert!($region.len() % PAGE_SIZE == 0);
let seg = Segment::from_unused($region.base()..$region.end(), |_| $typ).unwrap();
let _ = ManuallyDrop::new(seg);
}};
}
fn mark_unusable_ranges() {
let regions = &crate::boot::EARLY_INFO.get().unwrap().memory_regions;
for region in regions.iter() {
use crate::boot::memory_region::MemoryRegionType;
match region.typ() {
MemoryRegionType::BadMemory => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Unknown => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::NonVolatileSleep => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Reserved => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Kernel => mark_ranges!(region, KernelMeta),
MemoryRegionType::Module => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Framebuffer => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Reclaimable => mark_ranges!(region, UnusableMemoryMeta),
MemoryRegionType::Usable => {} // By default it is initialized as usable.
}
}
}
/// Adds a temporary linear mapping for the metadata frames.
///
/// We only assume boot page table to contain 4G linear mapping. Thus if the

11
ostd/src/mm/kspace/mod.rs
View File

@ -48,7 +48,7 @@ use spin::Once;
use super::{
frame::{
meta::{impl_frame_meta_for, mapping, MetaPageMeta},
meta::{mapping, KernelMeta, MetaPageMeta},
Frame, Segment,
},
nr_subpage_per_huge,
@ -214,7 +214,8 @@ pub fn init_kernel_page_table(meta_pages: Segment<MetaPageMeta>) {
};
let mut cursor = kpt.cursor_mut(&from).unwrap();
for frame_paddr in to.step_by(PAGE_SIZE) {
let page = Frame::<KernelMeta>::from_unused(frame_paddr, KernelMeta).unwrap();
// SAFETY: They were initialized at `super::frame::meta::init`.
let page = unsafe { Frame::<KernelMeta>::from_raw(frame_paddr) };
// SAFETY: we are doing mappings for the kernel.
unsafe {
let _old = cursor.map(page.into(), prop);
@ -246,9 +247,3 @@ pub unsafe fn activate_kernel_page_table() {
crate::mm::page_table::boot_pt::dismiss();
}
}
/// The metadata of pages that contains the kernel itself.
#[derive(Debug, Default)]
pub struct KernelMeta;
impl_frame_meta_for!(KernelMeta);