lib/efi_loader/efi_setup.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  EFI setup code
   4  *
   5  *  Copyright (c) 2016-2018 Alexander Graf et al.
   6  */
   7
   8 #include <common.h>
   9 #include <bootm.h>
  10 #include <efi_loader.h>
  11
  12 #define OBJ_LIST_NOT_INITIALIZED 1
  13
  14 static efi_status_t efi_obj_list_initialized = OBJ_LIST_NOT_INITIALIZED;
  15
  16 /*
  17  * Allow unaligned memory access.
  18  *
  19  * This routine is overridden by architectures providing this feature.
  20  */
  21 void __weak allow_unaligned(void)
  22 {
  23 }
  24
  25 /**
  26  * efi_init_platform_lang() - define supported languages
  27  *
  28  * Set the PlatformLangCodes and PlatformLang variables.
  29  *
  30  * Return:      status code
  31  */
  32 static efi_status_t efi_init_platform_lang(void)
  33 {
  34         efi_status_t ret;
  35         efi_uintn_t data_size = 0;
  36         char *lang = CONFIG_EFI_PLATFORM_LANG_CODES;
  37         char *pos;
  38
  39         /*
  40          * Variable PlatformLangCodes defines the language codes that the
  41          * machine can support.
  42          */
  43         ret = EFI_CALL(efi_set_variable(L"PlatformLangCodes",
  44                                         &efi_global_variable_guid,
  45                                         EFI_VARIABLE_BOOTSERVICE_ACCESS |
  46                                         EFI_VARIABLE_RUNTIME_ACCESS,
  47                                         sizeof(CONFIG_EFI_PLATFORM_LANG_CODES),
  48                                         CONFIG_EFI_PLATFORM_LANG_CODES));
  49         if (ret != EFI_SUCCESS)
  50                 goto out;
  51
  52         /*
  53          * Variable PlatformLang defines the language that the machine has been
  54          * configured for.
  55          */
  56         ret = EFI_CALL(efi_get_variable(L"PlatformLang",
  57                                         &efi_global_variable_guid,
  58                                         NULL, &data_size, &pos));
  59         if (ret == EFI_BUFFER_TOO_SMALL) {
  60                 /* The variable is already set. Do not change it. */
  61                 ret = EFI_SUCCESS;
  62                 goto out;
  63         }
  64
  65         /*
  66          * The list of supported languages is semicolon separated. Use the first
  67          * language to initialize PlatformLang.
  68          */
  69         pos = strchr(lang, ';');
  70         if (pos)
  71                 *pos = 0;
  72
  73         ret = EFI_CALL(efi_set_variable(L"PlatformLang",
  74                                         &efi_global_variable_guid,
  75                                         EFI_VARIABLE_NON_VOLATILE |
  76                                         EFI_VARIABLE_BOOTSERVICE_ACCESS |
  77                                         EFI_VARIABLE_RUNTIME_ACCESS,
  78                                         1 + strlen(lang), lang));
  79 out:
  80         if (ret != EFI_SUCCESS)
  81                 printf("EFI: cannot initialize platform language settings\n");
  82         return ret;
  83 }
  84
  85 /**
  86  * efi_init_obj_list() - Initialize and populate EFI object list
  87  *
  88  * Return:      status code
  89  */
  90 efi_status_t efi_init_obj_list(void)
  91 {
  92         u64 os_indications_supported = 0; /* None */
  93         efi_status_t ret = EFI_SUCCESS;
  94
  95         /* Initialize once only */
  96         if (efi_obj_list_initialized != OBJ_LIST_NOT_INITIALIZED)
  97                 return efi_obj_list_initialized;
  98
  99         /* Allow unaligned memory access */
 100         allow_unaligned();
 101
 102         /* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
 103         switch_to_non_secure_mode();
 104
 105         /* Define supported languages */
 106         ret = efi_init_platform_lang();
 107         if (ret != EFI_SUCCESS)
 108                 goto out;
 109
 110         /* Indicate supported features */
 111         ret = EFI_CALL(efi_set_variable(L"OsIndicationsSupported",
 112                                         &efi_global_variable_guid,
 113                                         EFI_VARIABLE_BOOTSERVICE_ACCESS |
 114                                         EFI_VARIABLE_RUNTIME_ACCESS,
 115                                         sizeof(os_indications_supported),
 116                                         &os_indications_supported));
 117         if (ret != EFI_SUCCESS)
 118                 goto out;
 119
 120         /* Initialize system table */
 121         ret = efi_initialize_system_table();
 122         if (ret != EFI_SUCCESS)
 123                 goto out;
 124
 125         /* Initialize root node */
 126         ret = efi_root_node_register();
 127         if (ret != EFI_SUCCESS)
 128                 goto out;
 129
 130         /* Initialize EFI driver uclass */
 131         ret = efi_driver_init();
 132         if (ret != EFI_SUCCESS)
 133                 goto out;
 134
 135         ret = efi_console_register();
 136         if (ret != EFI_SUCCESS)
 137                 goto out;
 138 #ifdef CONFIG_PARTITIONS
 139         ret = efi_disk_register();
 140         if (ret != EFI_SUCCESS)
 141                 goto out;
 142 #endif
 143 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
 144         ret = efi_gop_register();
 145         if (ret != EFI_SUCCESS)
 146                 goto out;
 147 #endif
 148 #ifdef CONFIG_NET
 149         ret = efi_net_register();
 150         if (ret != EFI_SUCCESS)
 151                 goto out;
 152 #endif
 153 #ifdef CONFIG_GENERATE_ACPI_TABLE
 154         ret = efi_acpi_register();
 155         if (ret != EFI_SUCCESS)
 156                 goto out;
 157 #endif
 158 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
 159         ret = efi_smbios_register();
 160         if (ret != EFI_SUCCESS)
 161                 goto out;
 162 #endif
 163         ret = efi_watchdog_register();
 164         if (ret != EFI_SUCCESS)
 165                 goto out;
 166
 167         /* Initialize EFI runtime services */
 168         ret = efi_reset_system_init();
 169         if (ret != EFI_SUCCESS)
 170                 goto out;
 171
 172 out:
 173         efi_obj_list_initialized = ret;
 174         return ret;
 175 }