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Update paging code for x86_64 v0.11.0

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Philipp Oppermann
2020-05-20 14:29:36 +02:00
parent a2f07828e4
commit 491889a237
1 changed files with 8 additions and 10 deletions
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18
src/memory.rs
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@@ -2,7 +2,6 @@ use bootloader::bootinfo::{MemoryMap, MemoryRegionType};
use x86_64::{ use x86_64::{
structures::paging::{ structures::paging::{
FrameAllocator, Mapper, OffsetPageTable, Page, PageTable, PhysFrame, Size4KiB, FrameAllocator, Mapper, OffsetPageTable, Page, PageTable, PhysFrame, Size4KiB,
UnusedPhysFrame,
}, },
PhysAddr, VirtAddr, PhysAddr, VirtAddr,
}; };
@@ -45,11 +44,12 @@ pub fn create_example_mapping(
use x86_64::structures::paging::PageTableFlags as Flags; use x86_64::structures::paging::PageTableFlags as Flags;
let frame = PhysFrame::containing_address(PhysAddr::new(0xb8000)); let frame = PhysFrame::containing_address(PhysAddr::new(0xb8000));
// FIXME: ONLY FOR TEMPORARY TESTING
let unused_frame = unsafe { UnusedPhysFrame::new(frame) };
let flags = Flags::PRESENT | Flags::WRITABLE; let flags = Flags::PRESENT | Flags::WRITABLE;
let map_to_result = mapper.map_to(page, unused_frame, flags, frame_allocator); let map_to_result = unsafe {
// FIXME: this is not safe, we do it only for testing
mapper.map_to(page, frame, flags, frame_allocator)
};
map_to_result.expect("map_to failed").flush(); map_to_result.expect("map_to failed").flush();
} }
@@ -57,7 +57,7 @@ pub fn create_example_mapping(
pub struct EmptyFrameAllocator; pub struct EmptyFrameAllocator;
unsafe impl FrameAllocator<Size4KiB> for EmptyFrameAllocator { unsafe impl FrameAllocator<Size4KiB> for EmptyFrameAllocator {
fn allocate_frame(&mut self) -> Option<UnusedPhysFrame> { fn allocate_frame(&mut self) -> Option<PhysFrame> {
None None
} }
} }
@@ -82,7 +82,7 @@ impl BootInfoFrameAllocator {
} }
/// Returns an iterator over the usable frames specified in the memory map. /// Returns an iterator over the usable frames specified in the memory map.
fn usable_frames(&self) -> impl Iterator<Item = UnusedPhysFrame> { fn usable_frames(&self) -> impl Iterator<Item = PhysFrame> {
// get usable regions from memory map // get usable regions from memory map
let regions = self.memory_map.iter(); let regions = self.memory_map.iter();
let usable_regions = regions.filter(|r| r.region_type == MemoryRegionType::Usable); let usable_regions = regions.filter(|r| r.region_type == MemoryRegionType::Usable);
@@ -91,14 +91,12 @@ impl BootInfoFrameAllocator {
// transform to an iterator of frame start addresses // transform to an iterator of frame start addresses
let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096)); let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096));
// create `PhysFrame` types from the start addresses // create `PhysFrame` types from the start addresses
let frames = frame_addresses.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr))); frame_addresses.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr)))
// we know that the frames are really unused
frames.map(|f| unsafe { UnusedPhysFrame::new(f) })
} }
} }
unsafe impl FrameAllocator<Size4KiB> for BootInfoFrameAllocator { unsafe impl FrameAllocator<Size4KiB> for BootInfoFrameAllocator {
fn allocate_frame(&mut self) -> Option<UnusedPhysFrame> { fn allocate_frame(&mut self) -> Option<PhysFrame> {
let frame = self.usable_frames().nth(self.next); let frame = self.usable_frames().nth(self.next);
self.next += 1; self.next += 1;
frame frame