mirror of https://github.com/vinc/moros.git
36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
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use linked_list_allocator::LockedHeap;
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use x86_64::{
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structures::paging::{
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mapper::MapToError, FrameAllocator, Mapper, Page, PageTableFlags, Size4KiB,
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},
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VirtAddr,
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};
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pub const HEAP_START: usize = 0x_4444_4444_0000;
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pub const HEAP_SIZE: usize = 100 * 1024; // 100 KiB
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#[global_allocator]
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static ALLOCATOR: LockedHeap = LockedHeap::empty();
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pub fn init_heap(mapper: &mut impl Mapper<Size4KiB>, frame_allocator: &mut impl FrameAllocator<Size4KiB>) -> Result<(), MapToError> {
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let page_range = {
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let heap_start = VirtAddr::new(HEAP_START as u64);
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let heap_end = heap_start + HEAP_SIZE - 1u64;
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let heap_start_page = Page::containing_address(heap_start);
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let heap_end_page = Page::containing_address(heap_end);
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Page::range_inclusive(heap_start_page, heap_end_page)
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};
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for page in page_range {
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let frame = frame_allocator.allocate_frame().ok_or(MapToError::FrameAllocationFailed)?;
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let flags = PageTableFlags::PRESENT | PageTableFlags::WRITABLE;
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mapper.map_to(page, frame, flags, frame_allocator)?.flush();
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}
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unsafe {
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ALLOCATOR.lock().init(HEAP_START, HEAP_SIZE);
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}
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Ok(())
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}
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