arch/arm64/kernel/efi-stub.c

   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
  16 /* Include shared EFI stub code */
  17 #include "../../../drivers/firmware/efi/efi-stub-helper.c"
  18 #include "../../../drivers/firmware/efi/fdt.c"
  19 #include "../../../drivers/firmware/efi/arm-stub.c"
  20
  21
  22 efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
  23                                  unsigned long *image_addr,
  24                                  unsigned long *image_size,
  25                                  unsigned long *reserve_addr,
  26                                  unsigned long *reserve_size,
  27                                  unsigned long dram_base,
  28                                  efi_loaded_image_t *image)
  29 {
  30         efi_status_t status;
  31         unsigned long kernel_size, kernel_memsize = 0;
  32
  33         /* Relocate the image, if required. */
  34         kernel_size = _edata - _text;
  35         if (*image_addr != (dram_base + TEXT_OFFSET)) {
  36                 kernel_memsize = kernel_size + (_end - _edata);
  37                 status = efi_relocate_kernel(sys_table, image_addr,
  38                                              kernel_size, kernel_memsize,
  39                                              dram_base + TEXT_OFFSET,
  40                                              PAGE_SIZE);
  41                 if (status != EFI_SUCCESS) {
  42                         pr_efi_err(sys_table, "Failed to relocate kernel\n");
  43                         return status;
  44                 }
  45                 if (*image_addr != (dram_base + TEXT_OFFSET)) {
  46                         pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
  47                         efi_free(sys_table, kernel_memsize, *image_addr);
  48                         return EFI_LOAD_ERROR;
  49                 }
  50                 *image_size = kernel_memsize;
  51         }
  52
  53
  54         return EFI_SUCCESS;
  55 }