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zynq-rs/src/ram.rs

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2019-11-11 09:37:06 +08:00
use core::cell::RefCell;
use core::alloc::GlobalAlloc;
use core::ptr::NonNull;
use alloc::alloc::Layout;
use linked_list_allocator::Heap;
use crate::zynq::ddr::DdrRam;
#[global_allocator]
static ALLOCATOR: HeapAlloc = HeapAlloc(RefCell::new(Heap::empty()));
/// LockedHeap doesn't locking properly
struct HeapAlloc(RefCell<Heap>);
/// FIXME: unsound; lock properly
unsafe impl Sync for HeapAlloc {}
unsafe impl GlobalAlloc for HeapAlloc {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
self.0.borrow_mut()
.allocate_first_fit(layout)
.ok()
.map_or(0 as *mut u8, |allocation| allocation.as_ptr())
}
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
self.0.borrow_mut()
.deallocate(NonNull::new_unchecked(ptr), layout)
}
}
pub fn init_alloc(ddr: &mut DdrRam) {
unsafe {
ALLOCATOR.0.borrow_mut()
.init(ddr.ptr::<u8>() as usize, ddr.size());
}
}
#[alloc_error_handler]
fn alloc_error(_: core::alloc::Layout) -> ! {
panic!("alloc_error")
}