1 files changed, 161 insertions, 0 deletions

diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
new file mode 100644
index 000000000000..10daa4bbb258
--- /dev/null
+++ b/drivers/firmware/efi/runtime-wrappers.c
@@ -0,0 +1,161 @@
+/*
+ * 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;
+}