forked from M-Labs/zynq-rs
43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
use core::cell::RefCell;
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use core::alloc::GlobalAlloc;
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use core::ptr::NonNull;
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use alloc::alloc::Layout;
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use linked_list_allocator::Heap;
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use crate::zynq::ddr::DdrRam;
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#[global_allocator]
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static ALLOCATOR: HeapAlloc = HeapAlloc(RefCell::new(Heap::empty()));
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/// LockedHeap doesn't locking properly
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struct HeapAlloc(RefCell<Heap>);
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/// FIXME: unsound; lock properly
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unsafe impl Sync for HeapAlloc {}
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unsafe impl GlobalAlloc for HeapAlloc {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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self.0.borrow_mut()
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.allocate_first_fit(layout)
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.ok()
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.map_or(0 as *mut u8, |allocation| allocation.as_ptr())
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}
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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self.0.borrow_mut()
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.deallocate(NonNull::new_unchecked(ptr), layout)
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}
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}
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pub fn init_alloc(ddr: &mut DdrRam) {
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unsafe {
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ALLOCATOR.0.borrow_mut()
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.init(ddr.ptr::<u8>() as usize, ddr.size());
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}
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}
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#[alloc_error_handler]
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fn alloc_error(_: core::alloc::Layout) -> ! {
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panic!("alloc_error")
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}
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