1 /*
2 * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org>
3 *
4 * This file implements the EFI boot stub for the arm64 kernel.
5 * Adapted from ARM version by Mark Salter <msalter@redhat.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12 #include <linux/efi.h>
13 #include <asm/efi.h>
14 #include <asm/sections.h>
15
handle_kernel_image(efi_system_table_t * sys_table,unsigned long * image_addr,unsigned long * image_size,unsigned long * reserve_addr,unsigned long * reserve_size,unsigned long dram_base,efi_loaded_image_t * image)16 efi_status_t __init handle_kernel_image(efi_system_table_t *sys_table,
17 unsigned long *image_addr,
18 unsigned long *image_size,
19 unsigned long *reserve_addr,
20 unsigned long *reserve_size,
21 unsigned long dram_base,
22 efi_loaded_image_t *image)
23 {
24 efi_status_t status;
25 unsigned long kernel_size, kernel_memsize = 0;
26
27 /* Relocate the image, if required. */
28 kernel_size = _edata - _text;
29 if (*image_addr != (dram_base + TEXT_OFFSET)) {
30 kernel_memsize = kernel_size + (_end - _edata);
31 status = efi_low_alloc(sys_table, kernel_memsize + TEXT_OFFSET,
32 SZ_2M, reserve_addr);
33 if (status != EFI_SUCCESS) {
34 pr_efi_err(sys_table, "Failed to relocate kernel\n");
35 return status;
36 }
37 memcpy((void *)*reserve_addr + TEXT_OFFSET, (void *)*image_addr,
38 kernel_size);
39 *image_addr = *reserve_addr + TEXT_OFFSET;
40 *reserve_size = kernel_memsize + TEXT_OFFSET;
41 }
42
43
44 return EFI_SUCCESS;
45 }
46