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 = NULL;
  30         struct efi_root_dp *dp;
  31
  32         /* Create device path protocol */
  33         dp = calloc(1, sizeof(*dp));
  34         if (!dp)
  35                 return EFI_OUT_OF_RESOURCES;
  36
  37         /* Fill vendor node */
  38         dp->vendor.dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
  39         dp->vendor.dp.sub_type = DEVICE_PATH_SUB_TYPE_VENDOR;
  40         dp->vendor.dp.length = sizeof(struct efi_device_path_vendor);
  41         dp->vendor.guid = efi_u_boot_guid;
  42
  43         /* Fill end node */
  44         dp->end.type = DEVICE_PATH_TYPE_END;
  45         dp->end.sub_type = DEVICE_PATH_SUB_TYPE_END;
  46         dp->end.length = sizeof(struct efi_device_path);
  47
  48         /* Create root node and install protocols */
  49         return EFI_CALL(efi_install_multiple_protocol_interfaces(&root,
  50                        /* Device path protocol */
  51                        &efi_guid_device_path, dp,
  52                        /* Device path to text protocol */
  53                        &efi_guid_device_path_to_text_protocol,
  54                        (void *)&efi_device_path_to_text,
  55                        /* Device path utilities protocol */
  56                        &efi_guid_device_path_utilities_protocol,
  57                        (void *)&efi_device_path_utilities,
  58                        /* Unicode collation protocol */
  59                        &efi_guid_unicode_collation_protocol,
  60                        (void *)&efi_unicode_collation_protocol,
  61 #if CONFIG_IS_ENABLED(EFI_LOADER_HII)
  62                        /* HII string protocol */
  63                        &efi_guid_hii_string_protocol,
  64                        (void *)&efi_hii_string,
  65                        /* HII database protocol */
  66                        &efi_guid_hii_database_protocol,
  67                        (void *)&efi_hii_database,
  68                        /* HII configuration routing protocol */
  69                        &efi_guid_hii_config_routing_protocol,
  70                        (void *)&efi_hii_config_routing,
  71 #endif
  72                        NULL));
  73 }