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Unsafe operations in unsafe functions require an unsafe block since Rust 2024

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Philipp Oppermann
2025-03-27 15:21:45 +01:00
parent 889ceba24a
commit 3a988748de
1 changed files with 6 additions and 4 deletions
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10
src/memory.rs
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@@ -1,9 +1,9 @@
use bootloader::bootinfo::{MemoryMap, MemoryRegionType}; use bootloader::bootinfo::{MemoryMap, MemoryRegionType};
use x86_64::{ use x86_64::{
PhysAddr, VirtAddr,
structures::paging::{ structures::paging::{
FrameAllocator, Mapper, OffsetPageTable, Page, PageTable, PhysFrame, Size4KiB, FrameAllocator, Mapper, OffsetPageTable, Page, PageTable, PhysFrame, Size4KiB,
}, },
PhysAddr, VirtAddr,
}; };
/// Initialize a new OffsetPageTable. /// Initialize a new OffsetPageTable.
@@ -13,8 +13,10 @@ use x86_64::{
/// `physical_memory_offset`. Also, this function must be only called once /// `physical_memory_offset`. Also, this function must be only called once
/// to avoid aliasing `&mut` references (which is undefined behavior). /// to avoid aliasing `&mut` references (which is undefined behavior).
pub unsafe fn init(physical_memory_offset: VirtAddr) -> OffsetPageTable<'static> { pub unsafe fn init(physical_memory_offset: VirtAddr) -> OffsetPageTable<'static> {
let level_4_table = active_level_4_table(physical_memory_offset); unsafe {
OffsetPageTable::new(level_4_table, physical_memory_offset) 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. /// Returns a mutable reference to the active level 4 table.
@@ -32,7 +34,7 @@ unsafe fn active_level_4_table(physical_memory_offset: VirtAddr) -> &'static mut
let virt = physical_memory_offset + phys.as_u64(); let virt = physical_memory_offset + phys.as_u64();
let page_table_ptr: *mut PageTable = virt.as_mut_ptr(); let page_table_ptr: *mut PageTable = virt.as_mut_ptr();
&mut *page_table_ptr // unsafe unsafe { &mut *page_table_ptr }
} }
/// Creates an example mapping for the given page to frame `0xb8000`. /// Creates an example mapping for the given page to frame `0xb8000`.