1 // SPDX-License-Identifier: GPL-2.0
9 * efi_allocate_pages_aligned() - Allocate memory pages
10 * @size: minimum number of bytes to allocate
11 * @addr: On return the address of the first allocated page. The first
12 * allocated page has alignment EFI_ALLOC_ALIGN which is an
13 * architecture dependent multiple of the page size.
14 * @max: the address that the last allocated memory page shall not
16 * @align: minimum alignment of the base of the allocation
18 * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
19 * to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will
20 * not exceed the address given by @max.
24 efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
25 unsigned long max, unsigned long align)
27 efi_physical_addr_t alloc_addr;
31 if (align < EFI_ALLOC_ALIGN)
32 align = EFI_ALLOC_ALIGN;
34 alloc_addr = ALIGN_DOWN(max + 1, align) - 1;
35 size = round_up(size, EFI_ALLOC_ALIGN);
36 slack = align / EFI_PAGE_SIZE - 1;
38 status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
39 EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack,
41 if (status != EFI_SUCCESS)
44 *addr = ALIGN((unsigned long)alloc_addr, align);
47 int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;
50 efi_bs_call(free_pages, alloc_addr, slack - l + 1);
54 efi_bs_call(free_pages, *addr + size, slack);