lib/efi_selftest/efi_selftest_tcg2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * efi_selftest_devicepath
   4  *
   5  * Copyright (c) 2020 Heinrich Schuchardt <xypron.glpk@gmx.de>
   6  *
   7  * Test the EFI_TCG2_PROTOCOL
   8  */
   9
  10 #include <efi_selftest.h>
  11 #include <efi_tcg2.h>
  12
  13 static struct efi_boot_services *boottime;
  14 static const efi_guid_t guid_tcg2 = EFI_TCG2_PROTOCOL_GUID;
  15
  16 /**
  17  * efi_st_tcg2_setup() - setup test
  18  *
  19  * @handle:     handle of the loaded image
  20  * @systable:   system table
  21  * @return:     status code
  22  */
  23 static int efi_st_tcg2_setup(const efi_handle_t img_handle,
  24                              const struct efi_system_table *systable)
  25 {
  26         boottime = systable->boottime;
  27
  28         return EFI_ST_SUCCESS;
  29 }
  30
  31 /**
  32  * efi_st_tcg2_execute() - execute test
  33  *
  34  * Call the GetCapability service of the EFI_TCG2_PROTOCOL.
  35  *
  36  * Return:      status code
  37  */
  38 static int efi_st_tcg2_execute(void)
  39 {
  40         struct efi_tcg2_protocol *tcg2;
  41         struct efi_tcg2_boot_service_capability capability;
  42         efi_status_t ret;
  43
  44         ret = boottime->locate_protocol(&guid_tcg2, NULL, (void **)&tcg2);
  45         if (ret != EFI_SUCCESS) {
  46                 efi_st_error("TCG2 protocol is not available.\n");
  47                 return EFI_ST_FAILURE;
  48         }
  49         capability.size = sizeof(struct efi_tcg2_boot_service_capability) - 1;
  50         ret = tcg2->get_capability(tcg2, &capability);
  51         if (ret != EFI_BUFFER_TOO_SMALL) {
  52                 efi_st_error("tcg2->get_capability on small buffer failed\n");
  53                 return EFI_ST_FAILURE;
  54         }
  55         capability.size = sizeof(struct efi_tcg2_boot_service_capability);
  56         ret = tcg2->get_capability(tcg2, &capability);
  57         if (ret != EFI_SUCCESS) {
  58                 efi_st_error("tcg2->get_capability failed\n");
  59                 return EFI_ST_FAILURE;
  60         }
  61         if (!capability.tpm_present_flag) {
  62                 efi_st_error("TPM not present\n");
  63                 return EFI_ST_FAILURE;
  64         }
  65         efi_st_printf("TPM supports 0x%.8x event logs\n",
  66                       capability.supported_event_logs);
  67         return EFI_ST_SUCCESS;
  68 }
  69
  70 EFI_UNIT_TEST(tcg2) = {
  71         .name = "tcg2",
  72         .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
  73         .execute = efi_st_tcg2_execute,
  74         .setup = efi_st_tcg2_setup,
  75 };