lib/efi_selftest/efi_selftest_rtc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * efi_selftest_rtc
   4  *
   5  * Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
   6  *
   7  * Test the real time clock runtime services.
   8  */
   9
  10 #include <efi_selftest.h>
  11
  12 #define EFI_ST_NO_RTC "Could not read real time clock\n"
  13 #define EFI_ST_NO_RTC_SET "Could not set real time clock\n"
  14
  15 static struct efi_runtime_services *runtime;
  16
  17 /*
  18  * Setup unit test.
  19  *
  20  * @handle:     handle of the loaded image
  21  * @systable:   system table
  22  * @return:     EFI_ST_SUCCESS for success
  23  */
  24 static int setup(const efi_handle_t handle,
  25                  const struct efi_system_table *systable)
  26 {
  27         runtime = systable->runtime;
  28         return EFI_ST_SUCCESS;
  29 }
  30
  31 /*
  32  * Execute unit test.
  33  *
  34  * Read and display current time.
  35  * Set a new value and read it back.
  36  * Set the real time clock back the current time.
  37  *
  38  * @return:     EFI_ST_SUCCESS for success
  39  */
  40 static int execute(void)
  41 {
  42         efi_status_t ret;
  43         struct efi_time tm_old;
  44 #ifdef CONFIG_EFI_SET_TIME
  45         struct efi_time tm, tm_new = {
  46                 .year = 2017,
  47                 .month = 5,
  48                 .day = 19,
  49                 .hour = 13,
  50                 .minute = 47,
  51                 .second = 53,
  52         };
  53 #endif
  54
  55         /* Display current time */
  56         ret = runtime->get_time(&tm_old, NULL);
  57         if (ret != EFI_SUCCESS) {
  58                 efi_st_error(EFI_ST_NO_RTC);
  59                 return EFI_ST_FAILURE;
  60         }
  61         efi_st_printf("Time according to real time clock: "
  62                       "%.4u-%.2u-%.2u %.2u:%.2u:%.2u\n",
  63                       tm_old.year, tm_old.month, tm_old.day,
  64                       tm_old.hour, tm_old.minute, tm_old.second);
  65 #ifdef CONFIG_EFI_SET_TIME
  66         ret = runtime->set_time(&tm_new);
  67         if (ret != EFI_SUCCESS) {
  68                 efi_st_error(EFI_ST_NO_RTC_SET);
  69                 return EFI_ST_FAILURE;
  70         }
  71         ret = runtime->get_time(&tm, NULL);
  72         if (ret != EFI_SUCCESS) {
  73                 efi_st_error(EFI_ST_NO_RTC);
  74                 return EFI_ST_FAILURE;
  75         }
  76         if (tm.year != tm_new.year ||
  77             tm.month != tm_new.month ||
  78             tm.day != tm_new.day ||
  79             tm.hour !=  tm_new.hour ||
  80             tm.minute != tm_new.minute ||
  81             tm.second < tm_new.second ||
  82             tm.second > tm_new.second + 2) {
  83                 efi_st_error(EFI_ST_NO_RTC_SET);
  84                 return EFI_ST_FAILURE;
  85         }
  86         /* Set time back to old value */
  87         ret = runtime->set_time(&tm_old);
  88         if (ret != EFI_SUCCESS) {
  89                 efi_st_error(EFI_ST_NO_RTC_SET);
  90                 return EFI_ST_FAILURE;
  91         }
  92 #endif
  93
  94         return EFI_ST_SUCCESS;
  95 }
  96
  97 EFI_UNIT_TEST(rtc) = {
  98         .name = "real time clock",
  99         .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
 100         .setup = setup,
 101         .execute = execute,
 102 };