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 const char *str[] = { "cold", "warm", "shutdown", "platform" }; 13 int efi_mode, cap_reset_mode; 14 15 if (!efi_enabled(EFI_RUNTIME_SERVICES)) 16 return; 17 18 switch (reboot_mode) { 19 case REBOOT_WARM: 20 case REBOOT_SOFT: 21 efi_mode = EFI_RESET_WARM; 22 break; 23 default: 24 efi_mode = EFI_RESET_COLD; 25 break; 26 } 27 28 /* 29 * If a quirk forced an EFI reset mode, always use that. 30 */ 31 if (efi_reboot_quirk_mode != -1) 32 efi_mode = efi_reboot_quirk_mode; 33 34 if (efi_capsule_pending(&cap_reset_mode)) { 35 if (efi_mode != cap_reset_mode) 36 printk(KERN_CRIT "efi: %s reset requested but pending " 37 "capsule update requires %s reset... Performing " 38 "%s reset.\n", str[efi_mode], str[cap_reset_mode], 39 str[cap_reset_mode]); 40 efi_mode = cap_reset_mode; 41 } 42 43 efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL); 44 } 45 46 bool __weak efi_poweroff_required(void) 47 { 48 return false; 49 } 50 51 static void efi_power_off(void) 52 { 53 efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL); 54 } 55 56 static int __init efi_shutdown_init(void) 57 { 58 if (!efi_enabled(EFI_RUNTIME_SERVICES)) 59 return -ENODEV; 60 61 if (efi_poweroff_required()) 62 pm_power_off = efi_power_off; 63 64 return 0; 65 } 66 late_initcall(efi_shutdown_init); 67