1022ee6c5SArd Biesheuvel /* 2022ee6c5SArd Biesheuvel * runtime-wrappers.c - Runtime Services function call wrappers 3022ee6c5SArd Biesheuvel * 4022ee6c5SArd Biesheuvel * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 5022ee6c5SArd Biesheuvel * 6022ee6c5SArd Biesheuvel * Split off from arch/x86/platform/efi/efi.c 7022ee6c5SArd Biesheuvel * 8022ee6c5SArd Biesheuvel * Copyright (C) 1999 VA Linux Systems 9022ee6c5SArd Biesheuvel * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 10022ee6c5SArd Biesheuvel * Copyright (C) 1999-2002 Hewlett-Packard Co. 11022ee6c5SArd Biesheuvel * Copyright (C) 2005-2008 Intel Co. 12022ee6c5SArd Biesheuvel * Copyright (C) 2013 SuSE Labs 13022ee6c5SArd Biesheuvel * 14022ee6c5SArd Biesheuvel * This file is released under the GPLv2. 15022ee6c5SArd Biesheuvel */ 16022ee6c5SArd Biesheuvel 17022ee6c5SArd Biesheuvel #include <linux/efi.h> 18022ee6c5SArd Biesheuvel #include <linux/spinlock.h> /* spinlock_t */ 19022ee6c5SArd Biesheuvel #include <asm/efi.h> 20022ee6c5SArd Biesheuvel 21022ee6c5SArd Biesheuvel /* 22022ee6c5SArd Biesheuvel * As per commit ef68c8f87ed1 ("x86: Serialize EFI time accesses on rtc_lock"), 23022ee6c5SArd Biesheuvel * the EFI specification requires that callers of the time related runtime 24022ee6c5SArd Biesheuvel * functions serialize with other CMOS accesses in the kernel, as the EFI time 25022ee6c5SArd Biesheuvel * functions may choose to also use the legacy CMOS RTC. 26022ee6c5SArd Biesheuvel */ 27022ee6c5SArd Biesheuvel __weak DEFINE_SPINLOCK(rtc_lock); 28022ee6c5SArd Biesheuvel 29022ee6c5SArd Biesheuvel static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) 30022ee6c5SArd Biesheuvel { 31022ee6c5SArd Biesheuvel unsigned long flags; 32022ee6c5SArd Biesheuvel efi_status_t status; 33022ee6c5SArd Biesheuvel 34022ee6c5SArd Biesheuvel spin_lock_irqsave(&rtc_lock, flags); 35022ee6c5SArd Biesheuvel status = efi_call_virt(get_time, tm, tc); 36022ee6c5SArd Biesheuvel spin_unlock_irqrestore(&rtc_lock, flags); 37022ee6c5SArd Biesheuvel return status; 38022ee6c5SArd Biesheuvel } 39022ee6c5SArd Biesheuvel 40022ee6c5SArd Biesheuvel static efi_status_t virt_efi_set_time(efi_time_t *tm) 41022ee6c5SArd Biesheuvel { 42022ee6c5SArd Biesheuvel unsigned long flags; 43022ee6c5SArd Biesheuvel efi_status_t status; 44022ee6c5SArd Biesheuvel 45022ee6c5SArd Biesheuvel spin_lock_irqsave(&rtc_lock, flags); 46022ee6c5SArd Biesheuvel status = efi_call_virt(set_time, tm); 47022ee6c5SArd Biesheuvel spin_unlock_irqrestore(&rtc_lock, flags); 48022ee6c5SArd Biesheuvel return status; 49022ee6c5SArd Biesheuvel } 50022ee6c5SArd Biesheuvel 51022ee6c5SArd Biesheuvel static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, 52022ee6c5SArd Biesheuvel efi_bool_t *pending, 53022ee6c5SArd Biesheuvel efi_time_t *tm) 54022ee6c5SArd Biesheuvel { 55022ee6c5SArd Biesheuvel unsigned long flags; 56022ee6c5SArd Biesheuvel efi_status_t status; 57022ee6c5SArd Biesheuvel 58022ee6c5SArd Biesheuvel spin_lock_irqsave(&rtc_lock, flags); 59022ee6c5SArd Biesheuvel status = efi_call_virt(get_wakeup_time, enabled, pending, tm); 60022ee6c5SArd Biesheuvel spin_unlock_irqrestore(&rtc_lock, flags); 61022ee6c5SArd Biesheuvel return status; 62022ee6c5SArd Biesheuvel } 63022ee6c5SArd Biesheuvel 64022ee6c5SArd Biesheuvel static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) 65022ee6c5SArd Biesheuvel { 66022ee6c5SArd Biesheuvel unsigned long flags; 67022ee6c5SArd Biesheuvel efi_status_t status; 68022ee6c5SArd Biesheuvel 69022ee6c5SArd Biesheuvel spin_lock_irqsave(&rtc_lock, flags); 70022ee6c5SArd Biesheuvel status = efi_call_virt(set_wakeup_time, enabled, tm); 71022ee6c5SArd Biesheuvel spin_unlock_irqrestore(&rtc_lock, flags); 72022ee6c5SArd Biesheuvel return status; 73022ee6c5SArd Biesheuvel } 74022ee6c5SArd Biesheuvel 75022ee6c5SArd Biesheuvel static efi_status_t virt_efi_get_variable(efi_char16_t *name, 76022ee6c5SArd Biesheuvel efi_guid_t *vendor, 77022ee6c5SArd Biesheuvel u32 *attr, 78022ee6c5SArd Biesheuvel unsigned long *data_size, 79022ee6c5SArd Biesheuvel void *data) 80022ee6c5SArd Biesheuvel { 81022ee6c5SArd Biesheuvel return efi_call_virt(get_variable, name, vendor, attr, data_size, data); 82022ee6c5SArd Biesheuvel } 83022ee6c5SArd Biesheuvel 84022ee6c5SArd Biesheuvel static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, 85022ee6c5SArd Biesheuvel efi_char16_t *name, 86022ee6c5SArd Biesheuvel efi_guid_t *vendor) 87022ee6c5SArd Biesheuvel { 88022ee6c5SArd Biesheuvel return efi_call_virt(get_next_variable, name_size, name, vendor); 89022ee6c5SArd Biesheuvel } 90022ee6c5SArd Biesheuvel 91022ee6c5SArd Biesheuvel static efi_status_t virt_efi_set_variable(efi_char16_t *name, 92022ee6c5SArd Biesheuvel efi_guid_t *vendor, 93022ee6c5SArd Biesheuvel u32 attr, 94022ee6c5SArd Biesheuvel unsigned long data_size, 95022ee6c5SArd Biesheuvel void *data) 96022ee6c5SArd Biesheuvel { 97022ee6c5SArd Biesheuvel return efi_call_virt(set_variable, name, vendor, attr, data_size, data); 98022ee6c5SArd Biesheuvel } 99022ee6c5SArd Biesheuvel 100022ee6c5SArd Biesheuvel static efi_status_t virt_efi_query_variable_info(u32 attr, 101022ee6c5SArd Biesheuvel u64 *storage_space, 102022ee6c5SArd Biesheuvel u64 *remaining_space, 103022ee6c5SArd Biesheuvel u64 *max_variable_size) 104022ee6c5SArd Biesheuvel { 105022ee6c5SArd Biesheuvel if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 106022ee6c5SArd Biesheuvel return EFI_UNSUPPORTED; 107022ee6c5SArd Biesheuvel 108022ee6c5SArd Biesheuvel return efi_call_virt(query_variable_info, attr, storage_space, 109022ee6c5SArd Biesheuvel remaining_space, max_variable_size); 110022ee6c5SArd Biesheuvel } 111022ee6c5SArd Biesheuvel 112022ee6c5SArd Biesheuvel static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) 113022ee6c5SArd Biesheuvel { 114022ee6c5SArd Biesheuvel return efi_call_virt(get_next_high_mono_count, count); 115022ee6c5SArd Biesheuvel } 116022ee6c5SArd Biesheuvel 117022ee6c5SArd Biesheuvel static void virt_efi_reset_system(int reset_type, 118022ee6c5SArd Biesheuvel efi_status_t status, 119022ee6c5SArd Biesheuvel unsigned long data_size, 120022ee6c5SArd Biesheuvel efi_char16_t *data) 121022ee6c5SArd Biesheuvel { 122022ee6c5SArd Biesheuvel __efi_call_virt(reset_system, reset_type, status, data_size, data); 123022ee6c5SArd Biesheuvel } 124022ee6c5SArd Biesheuvel 125022ee6c5SArd Biesheuvel static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, 126022ee6c5SArd Biesheuvel unsigned long count, 127022ee6c5SArd Biesheuvel unsigned long sg_list) 128022ee6c5SArd Biesheuvel { 129022ee6c5SArd Biesheuvel if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 130022ee6c5SArd Biesheuvel return EFI_UNSUPPORTED; 131022ee6c5SArd Biesheuvel 132022ee6c5SArd Biesheuvel return efi_call_virt(update_capsule, capsules, count, sg_list); 133022ee6c5SArd Biesheuvel } 134022ee6c5SArd Biesheuvel 135022ee6c5SArd Biesheuvel static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, 136022ee6c5SArd Biesheuvel unsigned long count, 137022ee6c5SArd Biesheuvel u64 *max_size, 138022ee6c5SArd Biesheuvel int *reset_type) 139022ee6c5SArd Biesheuvel { 140022ee6c5SArd Biesheuvel if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 141022ee6c5SArd Biesheuvel return EFI_UNSUPPORTED; 142022ee6c5SArd Biesheuvel 143022ee6c5SArd Biesheuvel return efi_call_virt(query_capsule_caps, capsules, count, max_size, 144022ee6c5SArd Biesheuvel reset_type); 145022ee6c5SArd Biesheuvel } 146022ee6c5SArd Biesheuvel 147022ee6c5SArd Biesheuvel void efi_native_runtime_setup(void) 148022ee6c5SArd Biesheuvel { 149022ee6c5SArd Biesheuvel efi.get_time = virt_efi_get_time; 150022ee6c5SArd Biesheuvel efi.set_time = virt_efi_set_time; 151022ee6c5SArd Biesheuvel efi.get_wakeup_time = virt_efi_get_wakeup_time; 152022ee6c5SArd Biesheuvel efi.set_wakeup_time = virt_efi_set_wakeup_time; 153022ee6c5SArd Biesheuvel efi.get_variable = virt_efi_get_variable; 154022ee6c5SArd Biesheuvel efi.get_next_variable = virt_efi_get_next_variable; 155022ee6c5SArd Biesheuvel efi.set_variable = virt_efi_set_variable; 156022ee6c5SArd Biesheuvel efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; 157022ee6c5SArd Biesheuvel efi.reset_system = virt_efi_reset_system; 158022ee6c5SArd Biesheuvel efi.query_variable_info = virt_efi_query_variable_info; 159022ee6c5SArd Biesheuvel efi.update_capsule = virt_efi_update_capsule; 160022ee6c5SArd Biesheuvel efi.query_capsule_caps = virt_efi_query_capsule_caps; 161022ee6c5SArd Biesheuvel } 162