1 // SPDX-License-Identifier: GPL-2.0 2 3 //! Allocator support. 4 5 use super::{flags::*, Flags}; 6 use core::alloc::{GlobalAlloc, Layout}; 7 use core::ptr; 8 9 struct KernelAllocator; 10 11 /// Calls `krealloc` with a proper size to all 12 /// 13 /// # Safety 14 /// 15 /// - `ptr` can be either null or a pointer wh 16 /// - `new_layout` must have a non-zero size. 17 pub(crate) unsafe fn krealloc_aligned(ptr: *mu 18 // Customized layouts from `Layout::from_s 19 let layout = new_layout.pad_to_align(); 20 21 // Note that `layout.size()` (after paddin 22 // which together with the slab guarantees 23 // object (see comments in `kmalloc()` for 24 let size = layout.size(); 25 26 // SAFETY: 27 // - `ptr` is either null or a pointer ret 28 // function safety requirement. 29 // - `size` is greater than 0 since it's f 30 // to the function safety requirement) 31 unsafe { bindings::krealloc(ptr as *const 32 } 33 34 unsafe impl GlobalAlloc for KernelAllocator { 35 unsafe fn alloc(&self, layout: Layout) -> 36 // SAFETY: `ptr::null_mut()` is null a 37 // requirement. 38 unsafe { krealloc_aligned(ptr::null_mu 39 } 40 41 unsafe fn dealloc(&self, ptr: *mut u8, _la 42 unsafe { 43 bindings::kfree(ptr as *const core 44 } 45 } 46 47 unsafe fn realloc(&self, ptr: *mut u8, lay 48 // SAFETY: 49 // - `new_size`, when rounded up to th 50 // overflow `isize` by the function 51 // - `layout.align()` is a proper alig 52 let layout = unsafe { Layout::from_siz 53 54 // SAFETY: 55 // - `ptr` is either null or a pointer 56 // requirement. 57 // - the size of `layout` is not zero 58 // requirement. 59 unsafe { krealloc_aligned(ptr, layout, 60 } 61 62 unsafe fn alloc_zeroed(&self, layout: Layo 63 // SAFETY: `ptr::null_mut()` is null a 64 // requirement. 65 unsafe { krealloc_aligned(ptr::null_mu 66 } 67 } 68 69 #[global_allocator] 70 static ALLOCATOR: KernelAllocator = KernelAllo 71 72 // See <https://github.com/rust-lang/rust/pull 73 #[no_mangle] 74 static __rust_no_alloc_shim_is_unstable: u8 =
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