Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include "efistub.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * efi_allocate_pages_aligned() - Allocate memory pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * @size:	minimum number of bytes to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * @addr:	On return the address of the first allocated page. The first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *		allocated page has alignment EFI_ALLOC_ALIGN which is an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *		architecture dependent multiple of the page size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * @max:	the address that the last allocated memory page shall not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *		exceed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * @align:	minimum alignment of the base of the allocation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * not exceed the address given by @max.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * Return:	status code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 					unsigned long max, unsigned long align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	efi_physical_addr_t alloc_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	int slack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	if (align < EFI_ALLOC_ALIGN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		align = EFI_ALLOC_ALIGN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	alloc_addr = ALIGN_DOWN(max + 1, align) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	size = round_up(size, EFI_ALLOC_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	slack = align / EFI_PAGE_SIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			     EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			     &alloc_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	if (status != EFI_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	*addr = ALIGN((unsigned long)alloc_addr, align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (slack > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		if (l) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 			efi_bs_call(free_pages, alloc_addr, slack - l + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			slack = l - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		if (slack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			efi_bs_call(free_pages, *addr + size, slack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }