michaelkuc6/blog_os
1
0
Fork 0
mirror of https://github.com/phil-opp/blog_os.git synced 2025-12-16 22:37:49 +00:00
Code Issues Projects Releases Wiki Activity

Merge branch 'post-11' into post-12

Browse Source
This commit is contained in:
Philipp Oppermann
2025-03-27 15:23:12 +01:00
parent 3fedddde32 a26d6c1b54
commit 4057d8db22
1 changed files with 6 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/memory.rs
View File

@@ -1,7 +1,7 @@
use bootloader::bootinfo::{MemoryMap, MemoryRegionType};
use x86_64::{
structures::paging::{FrameAllocator, OffsetPageTable, PageTable, PhysFrame, Size4KiB},
PhysAddr, VirtAddr,
structures::paging::{FrameAllocator, OffsetPageTable, PageTable, PhysFrame, Size4KiB},
};
/// Initialize a new OffsetPageTable.
@@ -11,8 +11,10 @@ use x86_64::{
/// `physical_memory_offset`. Also, this function must be only called once
/// to avoid aliasing `&mut` references (which is undefined behavior).
pub unsafe fn init(physical_memory_offset: VirtAddr) -> OffsetPageTable<'static> {
let level_4_table = active_level_4_table(physical_memory_offset);
OffsetPageTable::new(level_4_table, physical_memory_offset)
unsafe {
let level_4_table = active_level_4_table(physical_memory_offset);
OffsetPageTable::new(level_4_table, physical_memory_offset)
}
}
/// Returns a mutable reference to the active level 4 table.
@@ -30,7 +32,7 @@ unsafe fn active_level_4_table(physical_memory_offset: VirtAddr) -> &'static mut
let virt = physical_memory_offset + phys.as_u64();
let page_table_ptr: *mut PageTable = virt.as_mut_ptr();
&mut *page_table_ptr // unsafe
unsafe { &mut *page_table_ptr }
}
/// A FrameAllocator that always returns `None`.