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Only perform a single TLB flush after identity mapping #265

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merged 2 commits into from
Sep 25, 2022
Merged

Only perform a single TLB flush after identity mapping #265

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14c63aa
Only perform a single TLB flush after identity mapping
hawkw Sep 23, 2022
3bb5b8e
Merge branch 'main' into eliza/flush-all
phil-opp Sep 25, 2022
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13 changes: 11 additions & 2 deletions src/bin/bios.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -117,19 +117,28 @@ fn bootloader_main(
PhysFrame::containing_address(PhysAddr::new(GIGABYTE));
let end_frame = PhysFrame::containing_address(PhysAddr::new(max_phys_addr - 1));
for frame in PhysFrame::range_inclusive(start_frame, end_frame) {
unsafe {
let flusher = unsafe {
bootloader_page_table
.identity_map(
frame,
PageTableFlags::PRESENT | PageTableFlags::WRITABLE,
&mut frame_allocator,
)
.unwrap()
.flush()
};
// skip flushing the entry from the TLB for now, as we will
// flush the entire TLB at the end of the loop.
flusher.ignore();
}
}

// once all the physical memory is mapped, flush the TLB by reloading the
// CR3 register.
//
// we perform a single flush here rather than flushing each individual entry as
// it's mapped using `invlpg`, for efficiency.
x86_64::instructions::tlb::flush_all();

let framebuffer_addr = PhysAddr::new(unsafe { VBEModeInfo_physbaseptr }.into());
let mut error = None;
let framebuffer_info = unsafe {
Expand Down