src/image/efi_image.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 FILE_LICENCE ( GPL2_OR_LATER );
  20
  21 #include <errno.h>
  22 #include <gpxe/efi/efi.h>
  23 #include <gpxe/image.h>
  24 #include <gpxe/features.h>
  25
  26 FEATURE ( FEATURE_IMAGE, "EFI", DHCP_EB_FEATURE_EFI, 1 );
  27
  28 struct image_type efi_image_type __image_type ( PROBE_NORMAL );
  29
  30 /**
  31  * Execute EFI image
  32  *
  33  * @v image             EFI image
  34  * @ret rc              Return status code
  35  */
  36 static int efi_image_exec ( struct image *image ) {
  37         EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
  38         EFI_HANDLE handle;
  39         UINTN exit_data_size;
  40         CHAR16 *exit_data;
  41         EFI_STATUS efirc;
  42
  43         /* Attempt loading image */
  44         if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
  45                                        user_to_virt ( image->data, 0 ),
  46                                        image->len, &handle ) ) != 0 ) {
  47                 /* Not an EFI image */
  48                 DBGC ( image, "EFIIMAGE %p could not load: %s\n",
  49                        image, efi_strerror ( efirc ) );
  50                 return -ENOEXEC;
  51         }
  52
  53         /* Start the image */
  54         if ( ( efirc = bs->StartImage ( handle, &exit_data_size,
  55                                         &exit_data ) ) != 0 ) {
  56                 DBGC ( image, "EFIIMAGE %p returned with status %s\n",
  57                        image, efi_strerror ( efirc ) );
  58                 goto done;
  59         }
  60
  61  done:
  62         /* Unload the image.  We can't leave it loaded, because we
  63          * have no "unload" operation.
  64          */
  65         bs->UnloadImage ( handle );
  66
  67         return EFIRC_TO_RC ( efirc );
  68 }
  69
  70 /**
  71  * Load EFI image into memory
  72  *
  73  * @v image             EFI file
  74  * @ret rc              Return status code
  75  */
  76 static int efi_image_load ( struct image *image ) {
  77         EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
  78         EFI_HANDLE handle;
  79         EFI_STATUS efirc;
  80
  81         /* Attempt loading image */
  82         if ( ( efirc = bs->LoadImage ( FALSE, efi_image_handle, NULL,
  83                                        user_to_virt ( image->data, 0 ),
  84                                        image->len, &handle ) ) != 0 ) {
  85                 /* Not an EFI image */
  86                 DBGC ( image, "EFIIMAGE %p could not load: %s\n",
  87                        image, efi_strerror ( efirc ) );
  88                 return -ENOEXEC;
  89         }
  90
  91         /* This is an EFI image */
  92         if ( ! image->type )
  93                 image->type = &efi_image_type;
  94
  95         /* Unload the image.  We can't leave it loaded, because we
  96          * have no "unload" operation.
  97          */
  98         bs->UnloadImage ( handle );
  99
 100         return 0;
 101 }
 102
 103 /** EFI image type */
 104 struct image_type efi_image_type __image_type ( PROBE_NORMAL ) = {
 105         .name = "EFI",
 106         .load = efi_image_load,
 107         .exec = efi_image_exec,
 108 };