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 <linux/libfdt.h>
  15 #include <asm/sections.h>
  16
  17 static void efi_char16_printk(efi_system_table_t *sys_table_arg,
  18                               efi_char16_t *str);
  19
  20 static efi_status_t efi_open_volume(efi_system_table_t *sys_table,
  21                                     void *__image, void **__fh);
  22 static efi_status_t efi_file_close(void *handle);
  23
  24 static efi_status_t
  25 efi_file_read(void *handle, unsigned long *size, void *addr);
  26
  27 static efi_status_t
  28 efi_file_size(efi_system_table_t *sys_table, void *__fh,
  29               efi_char16_t *filename_16, void **handle, u64 *file_sz);
  30
  31 /* Include shared EFI stub code */
  32 #include "../../../drivers/firmware/efi/efi-stub-helper.c"
  33 #include "../../../drivers/firmware/efi/fdt.c"
  34 #include "../../../drivers/firmware/efi/arm-stub.c"
  35
  36
  37 static efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
  38                                         unsigned long *image_addr,
  39                                         unsigned long *image_size,
  40                                         unsigned long *reserve_addr,
  41                                         unsigned long *reserve_size,
  42                                         unsigned long dram_base,
  43                                         efi_loaded_image_t *image)
  44 {
  45         efi_status_t status;
  46         unsigned long kernel_size, kernel_memsize = 0;
  47
  48         /* Relocate the image, if required. */
  49         kernel_size = _edata - _text;
  50         if (*image_addr != (dram_base + TEXT_OFFSET)) {
  51                 kernel_memsize = kernel_size + (_end - _edata);
  52                 status = efi_relocate_kernel(sys_table, image_addr,
  53                                              kernel_size, kernel_memsize,
  54                                              dram_base + TEXT_OFFSET,
  55                                              PAGE_SIZE);
  56                 if (status != EFI_SUCCESS) {
  57                         pr_efi_err(sys_table, "Failed to relocate kernel\n");
  58                         return status;
  59                 }
  60                 if (*image_addr != (dram_base + TEXT_OFFSET)) {
  61                         pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
  62                         efi_free(sys_table, kernel_memsize, *image_addr);
  63                         return EFI_LOAD_ERROR;
  64                 }
  65                 *image_size = kernel_memsize;
  66         }
  67
  68
  69         return EFI_SUCCESS;
  70 }