lib/efi_loader/efi_root_node.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Root node for system services
   4  *
   5  *  Copyright (c) 2018 Heinrich Schuchardt
   6  */
   7
   8 #include <common.h>
   9 #include <malloc.h>
  10 #include <efi_loader.h>
  11
  12 const efi_guid_t efi_u_boot_guid = U_BOOT_GUID;
  13
  14 struct efi_root_dp {
  15         struct efi_device_path_vendor vendor;
  16         struct efi_device_path end;
  17 } __packed;
  18
  19 /**
  20  * efi_root_node_register() - create root node
  21  *
  22  * Create the root node on which we install all protocols that are
  23  * not related to a loaded image or a driver.
  24  *
  25  * Return:      status code
  26  */
  27 efi_status_t efi_root_node_register(void)
  28 {
  29         efi_handle_t root;
  30         efi_status_t ret;
  31         struct efi_root_dp *dp;
  32
  33         /* Create handle */
  34         ret = efi_create_handle(&root);
  35         if (ret != EFI_SUCCESS)
  36                 return ret;
  37
  38         /* Install device path protocol */
  39         dp = calloc(1, sizeof(*dp));
  40         if (!dp)
  41                 return EFI_OUT_OF_RESOURCES;
  42
  43         /* Fill vendor node */
  44         dp->vendor.dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
  45         dp->vendor.dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
  46         dp->vendor.dp.length = sizeof(struct efi_device_path_vendor);
  47         dp->vendor.guid = efi_u_boot_guid;
  48
  49         /* Fill end node */
  50         dp->end.type = DEVICE_PATH_TYPE_END;
  51         dp->end.sub_type = DEVICE_PATH_SUB_TYPE_END;
  52         dp->end.length = sizeof(struct efi_device_path);
  53
  54         /* Install device path protocol */
  55         ret = efi_add_protocol(root, &efi_guid_device_path, dp);
  56         if (ret != EFI_SUCCESS)
  57                 goto failure;
  58
  59         /* Install device path to text protocol */
  60         ret = efi_add_protocol(root, &efi_guid_device_path_to_text_protocol,
  61                                (void *)&efi_device_path_to_text);
  62         if (ret != EFI_SUCCESS)
  63                 goto failure;
  64
  65         /* Install device path utilities protocol */
  66         ret = efi_add_protocol(root, &efi_guid_device_path_utilities_protocol,
  67                                (void *)&efi_device_path_utilities);
  68         if (ret != EFI_SUCCESS)
  69                 goto failure;
  70
  71         /* Install Unicode collation protocol */
  72         ret = efi_add_protocol(root, &efi_guid_unicode_collation_protocol,
  73                                (void *)&efi_unicode_collation_protocol);
  74         if (ret != EFI_SUCCESS)
  75                 goto failure;
  76
  77 failure:
  78         return ret;
  79 }