65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Allocator support.
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use core::alloc::{GlobalAlloc, Layout};
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use core::ptr;
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use crate::bindings;
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struct KernelAllocator;
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unsafe impl GlobalAlloc for KernelAllocator {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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// `krealloc()` is used instead of `kmalloc()` because the latter is
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// an inline function and cannot be bound to as a result.
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unsafe { bindings::krealloc(ptr::null(), layout.size(), bindings::GFP_KERNEL) as *mut u8 }
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}
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unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
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unsafe {
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bindings::kfree(ptr as *const core::ffi::c_void);
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}
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}
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}
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#[global_allocator]
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static ALLOCATOR: KernelAllocator = KernelAllocator;
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// `rustc` only generates these for some crate types. Even then, we would need
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// to extract the object file that has them from the archive. For the moment,
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// let's generate them ourselves instead.
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//
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// Note that `#[no_mangle]` implies exported too, nowadays.
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#[no_mangle]
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fn __rust_alloc(size: usize, _align: usize) -> *mut u8 {
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unsafe { bindings::krealloc(core::ptr::null(), size, bindings::GFP_KERNEL) as *mut u8 }
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}
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#[no_mangle]
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fn __rust_dealloc(ptr: *mut u8, _size: usize, _align: usize) {
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unsafe { bindings::kfree(ptr as *const core::ffi::c_void) };
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}
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#[no_mangle]
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fn __rust_realloc(ptr: *mut u8, _old_size: usize, _align: usize, new_size: usize) -> *mut u8 {
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unsafe {
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bindings::krealloc(
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ptr as *const core::ffi::c_void,
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new_size,
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bindings::GFP_KERNEL,
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) as *mut u8
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}
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}
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#[no_mangle]
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fn __rust_alloc_zeroed(size: usize, _align: usize) -> *mut u8 {
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unsafe {
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bindings::krealloc(
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core::ptr::null(),
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size,
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bindings::GFP_KERNEL | bindings::__GFP_ZERO,
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) as *mut u8
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}
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}
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