Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
 
#include <linux/efi.h>
#include <asm/efi.h>
 
#include "efistub.h"
 
/**
 * efi_allocate_pages_aligned() - Allocate memory pages
 * @size:	minimum number of bytes to allocate
 * @addr:	On return the address of the first allocated page. The first
 *		allocated page has alignment EFI_ALLOC_ALIGN which is an
 *		architecture dependent multiple of the page size.
 * @max:	the address that the last allocated memory page shall not
 *		exceed
 * @align:	minimum alignment of the base of the allocation
 *
 * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
 * to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will
 * not exceed the address given by @max.
 *
 * Return:	status code
 */
efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
<------><------><------><------><------>unsigned long max, unsigned long align)
{
<------>efi_physical_addr_t alloc_addr;
<------>efi_status_t status;
<------>int slack;
 
<------>if (align < EFI_ALLOC_ALIGN)
<------><------>align = EFI_ALLOC_ALIGN;
 
<------>alloc_addr = ALIGN_DOWN(max + 1, align) - 1;
<------>size = round_up(size, EFI_ALLOC_ALIGN);
<------>slack = align / EFI_PAGE_SIZE - 1;
 
<------>status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
<------><------><------>     EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack,
<------><------><------>     &alloc_addr);
<------>if (status != EFI_SUCCESS)
<------><------>return status;
 
<------>*addr = ALIGN((unsigned long)alloc_addr, align);
 
<------>if (slack > 0) {
<------><------>int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;
 
<------><------>if (l) {
<------><------><------>efi_bs_call(free_pages, alloc_addr, slack - l + 1);
<------><------><------>slack = l - 1;
<------><------>}
<------><------>if (slack)
<------><------><------>efi_bs_call(free_pages, *addr + size, slack);
<------>}
<------>return EFI_SUCCESS;
}