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/*
* runtime-wrappers.c - Runtime Services function call wrappers
*
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
*
* Split off from arch/x86/platform/efi/efi.c
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999-2002 Hewlett-Packard Co.
* Copyright (C) 2005-2008 Intel Co.
* Copyright (C) 2013 SuSE Labs
*
* This file is released under the GPLv2.
*/
#include <linux/efi.h>
#include <linux/spinlock.h> /* spinlock_t */
#include <asm/efi.h>
/*
* As per commit ef68c8f87ed1 ("x86: Serialize EFI time accesses on rtc_lock"),
* the EFI specification requires that callers of the time related runtime
* functions serialize with other CMOS accesses in the kernel, as the EFI time
* functions may choose to also use the legacy CMOS RTC.
*/
__weak DEFINE_SPINLOCK(rtc_lock);
static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
unsigned long flags;
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt(get_time, tm, tc);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
unsigned long flags;
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt(set_time, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
efi_bool_t *pending,
efi_time_t *tm)
{
unsigned long flags;
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
unsigned long flags;
efi_status_t status;
spin_lock_irqsave(&rtc_lock, flags);
status = efi_call_virt(set_wakeup_time, enabled, tm);
spin_unlock_irqrestore(&rtc_lock, flags);
return status;
}
static efi_status_t virt_efi_get_variable(efi_char16_t *name,
efi_guid_t *vendor,
u32 *attr,
unsigned long *data_size,
void *data)
{
return efi_call_virt(get_variable, name, vendor, attr, data_size, data);
}
static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
efi_char16_t *name,
efi_guid_t *vendor)
{
return efi_call_virt(get_next_variable, name_size, name, vendor);
}
static efi_status_t virt_efi_set_variable(efi_char16_t *name,
efi_guid_t *vendor,
u32 attr,
unsigned long data_size,
void *data)
{
return efi_call_virt(set_variable, name, vendor, attr, data_size, data);
}
static efi_status_t virt_efi_query_variable_info(u32 attr,
u64 *storage_space,
u64 *remaining_space,
u64 *max_variable_size)
{
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt(query_variable_info, attr, storage_space,
remaining_space, max_variable_size);
}
static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
return efi_call_virt(get_next_high_mono_count, count);
}
static void virt_efi_reset_system(int reset_type,
efi_status_t status,
unsigned long data_size,
efi_char16_t *data)
{
__efi_call_virt(reset_system, reset_type, status, data_size, data);
}
static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
unsigned long count,
unsigned long sg_list)
{
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt(update_capsule, capsules, count, sg_list);
}
static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
unsigned long count,
u64 *max_size,
int *reset_type)
{
if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
return efi_call_virt(query_capsule_caps, capsules, count, max_size,
reset_type);
}
void efi_native_runtime_setup(void)
{
efi.get_time = virt_efi_get_time;
efi.set_time = virt_efi_set_time;
efi.get_wakeup_time = virt_efi_get_wakeup_time;
efi.set_wakeup_time = virt_efi_set_wakeup_time;
efi.get_variable = virt_efi_get_variable;
efi.get_next_variable = virt_efi_get_next_variable;
efi.set_variable = virt_efi_set_variable;
efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
efi.reset_system = virt_efi_reset_system;
efi.query_variable_info = virt_efi_query_variable_info;
efi.update_capsule = virt_efi_update_capsule;
efi.query_capsule_caps = virt_efi_query_capsule_caps;
}
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