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core: Reserve physical page 0

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In the kernel's early stages we access physical memory identity-mapped, so it's not very good for us to allocate that frame and then try to use it.
This commit is contained in:
Gabriel 2025-02-15 22:18:49 +01:00
parent 8bfc8a5781
commit 090e4148b8
1 changed files with 3 additions and 0 deletions
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core/src/pmm.zig
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@ -99,5 +99,8 @@ pub fn initializeFrameAllocator(tag: *easyboot.multiboot_tag_mmap_t) !FrameAlloc
const frames_to_lock = try std.math.divCeil(usize, bitmap_size, platform.PAGE_SIZE); const frames_to_lock = try std.math.divCeil(usize, bitmap_size, platform.PAGE_SIZE);
try lockFrames(&allocator, @intFromPtr(bitmap_base_address), frames_to_lock); try lockFrames(&allocator, @intFromPtr(bitmap_base_address), frames_to_lock);
// Avoid causing trouble.
try lockFrame(&allocator, 0);
return allocator; return allocator;
} }