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 efi_handle_t efi_root = NULL;
  15
  16 struct efi_root_dp {
  17         struct efi_device_path_vendor vendor;
  18         struct efi_device_path end;
  19 } __packed;
  20
  21 /**
  22  * efi_root_node_register() - create root node
  23  *
  24  * Create the root node on which we install all protocols that are
  25  * not related to a loaded image or a driver.
  26  *
  27  * Return:      status code
  28  */
  29 efi_status_t efi_root_node_register(void)
  30 {
  31         efi_status_t ret;
  32         struct efi_root_dp *dp;
  33
  34         /* Create device path protocol */
  35         dp = calloc(1, sizeof(*dp));
  36         if (!dp)
  37                 return EFI_OUT_OF_RESOURCES;
  38
  39         /* Fill vendor node */
  40         dp->vendor.dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
  41         dp->vendor.dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
  42         dp->vendor.dp.length = sizeof(struct efi_device_path_vendor);
  43         dp->vendor.guid = efi_u_boot_guid;
  44
  45         /* Fill end node */
  46         dp->end.type = DEVICE_PATH_TYPE_END;
  47         dp->end.sub_type = DEVICE_PATH_SUB_TYPE_END;
  48         dp->end.length = sizeof(struct efi_device_path);
  49
  50         /* Create root node and install protocols */
  51         ret = EFI_CALL(efi_install_multiple_protocol_interfaces
  52                         (&efi_root,
  53                          /* Device path protocol */
  54                          &efi_guid_device_path, dp,
  55                          /* Device path to text protocol */
  56                          &efi_guid_device_path_to_text_protocol,
  57                          (void *)&efi_device_path_to_text,
  58                          /* Device path utilities protocol */
  59                          &efi_guid_device_path_utilities_protocol,
  60                          (void *)&efi_device_path_utilities,
  61                          /* Unicode collation protocol */
  62                          &efi_guid_unicode_collation_protocol,
  63                          (void *)&efi_unicode_collation_protocol,
  64 #if CONFIG_IS_ENABLED(EFI_LOADER_HII)
  65                          /* HII string protocol */
  66                          &efi_guid_hii_string_protocol,
  67                          (void *)&efi_hii_string,
  68                          /* HII database protocol */
  69                          &efi_guid_hii_database_protocol,
  70                          (void *)&efi_hii_database,
  71                          /* HII configuration routing protocol */
  72                          &efi_guid_hii_config_routing_protocol,
  73                          (void *)&efi_hii_config_routing,
  74 #endif
  75                          NULL));
  76         efi_root->type = EFI_OBJECT_TYPE_U_BOOT_FIRMWARE;
  77         return ret;
  78 }