drivers/firmware/efi/reboot.c

   1 /*
   2  * Copyright (C) 2014 Intel Corporation; author Matt Fleming
   3  * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com>
   4  */
   5 #include <linux/efi.h>
   6 #include <linux/reboot.h>
   7
   8 int efi_reboot_quirk_mode = -1;
   9
  10 void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
  11 {
  12         int efi_mode;
  13
  14         if (!efi_enabled(EFI_RUNTIME_SERVICES))
  15                 return;
  16
  17         switch (reboot_mode) {
  18         case REBOOT_WARM:
  19         case REBOOT_SOFT:
  20                 efi_mode = EFI_RESET_WARM;
  21                 break;
  22         default:
  23                 efi_mode = EFI_RESET_COLD;
  24                 break;
  25         }
  26
  27         /*
  28          * If a quirk forced an EFI reset mode, always use that.
  29          */
  30         if (efi_reboot_quirk_mode != -1)
  31                 efi_mode = efi_reboot_quirk_mode;
  32
  33         efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
  34 }
  35
  36 bool __weak efi_poweroff_required(void)
  37 {
  38         return false;
  39 }
  40
  41 static void efi_power_off(void)
  42 {
  43         efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
  44 }
  45
  46 static int __init efi_shutdown_init(void)
  47 {
  48         if (!efi_enabled(EFI_RUNTIME_SERVICES))
  49                 return -ENODEV;
  50
  51         if (efi_poweroff_required())
  52                 pm_power_off = efi_power_off;
  53
  54         return 0;
  55 }
  56 late_initcall(efi_shutdown_init);