41 lines
1.3 KiB
Rust
41 lines
1.3 KiB
Rust
use core::alloc::{GlobalAlloc, Layout};
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use core::ptr::{self, NonNull};
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use linked_list_allocator::Heap;
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use spin::Mutex;
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use crate::paging::{ActivePageTable, TableKind};
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static HEAP: Mutex<Option<Heap>> = Mutex::new(None);
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pub struct Allocator;
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impl Allocator {
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pub unsafe fn init(offset: usize, size: usize) {
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*HEAP.lock() = Some(Heap::new(offset, size));
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}
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}
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unsafe impl GlobalAlloc for Allocator {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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while let Some(ref mut heap) = *HEAP.lock() {
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match heap.allocate_first_fit(layout) {
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Err(()) => {
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let size = heap.size();
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super::map_heap(&mut ActivePageTable::new(TableKind::Kernel), crate::KERNEL_HEAP_OFFSET + size, crate::KERNEL_HEAP_SIZE);
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heap.extend(crate::KERNEL_HEAP_SIZE);
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},
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other => return other.ok().map_or(ptr::null_mut(), |allocation| allocation.as_ptr()),
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}
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}
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panic!("__rust_allocate: heap not initialized");
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}
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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if let Some(ref mut heap) = *HEAP.lock() {
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heap.deallocate(NonNull::new_unchecked(ptr), layout)
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} else {
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panic!("__rust_deallocate: heap not initialized");
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}
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}
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}
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