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         struct efi_root_dp *dp;
  32
  33         /* Create device path protocol */
  34         dp = calloc(1, sizeof(*dp));
  35         if (!dp)
  36                 return EFI_OUT_OF_RESOURCES;
  37
  38         /* Fill vendor node */
  39         dp->vendor.dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
  40         dp->vendor.dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
  41         dp->vendor.dp.length = sizeof(struct efi_device_path_vendor);
  42         dp->vendor.guid = efi_u_boot_guid;
  43
  44         /* Fill end node */
  45         dp->end.type = DEVICE_PATH_TYPE_END;
  46         dp->end.sub_type = DEVICE_PATH_SUB_TYPE_END;
  47         dp->end.length = sizeof(struct efi_device_path);
  48
  49         /* Create root node and install protocols */
  50         return EFI_CALL(efi_install_multiple_protocol_interfaces(&efi_root,
  51                        /* Device path protocol */
  52                        &efi_guid_device_path, dp,
  53                        /* Device path to text protocol */
  54                        &efi_guid_device_path_to_text_protocol,
  55                        (void *)&efi_device_path_to_text,
  56                        /* Device path utilities protocol */
  57                        &efi_guid_device_path_utilities_protocol,
  58                        (void *)&efi_device_path_utilities,
  59                        /* Unicode collation protocol */
  60                        &efi_guid_unicode_collation_protocol,
  61                        (void *)&efi_unicode_collation_protocol,
  62 #if CONFIG_IS_ENABLED(EFI_LOADER_HII)
  63                        /* HII string protocol */
  64                        &efi_guid_hii_string_protocol,
  65                        (void *)&efi_hii_string,
  66                        /* HII database protocol */
  67                        &efi_guid_hii_database_protocol,
  68                        (void *)&efi_hii_database,
  69                        /* HII configuration routing protocol */
  70                        &efi_guid_hii_config_routing_protocol,
  71                        (void *)&efi_hii_config_routing,
  72 #endif
  73                        NULL));
  74 }