[PATCH] efi_runtime: add resetsystem runtime service

[Ivan Hu]

Reset system by UEFI runtime service will not be tested on fwts. Still add this
patch to efi_runtime driver to make it more complete on UEFI runtime interfaces.

Signed-off-by: Ivan Hu <ivan.hu at canonical.com>
---
 efi_runtime/efi_runtime.c | 23 +++++++++++++++++++++++
 efi_runtime/efi_runtime.h | 10 ++++++++++
 2 files changed, 33 insertions(+)

diff --git a/efi_runtime/efi_runtime.c b/efi_runtime/efi_runtime.c
index 6570a54..e29430c 100644
--- a/efi_runtime/efi_runtime.c
+++ b/efi_runtime/efi_runtime.c
@@ -561,6 +561,29 @@ static long efi_runtime_get_nexthighmonocount(unsigned long arg)
 	return 0;
 }
 
+static long efi_runtime_reset_system(unsigned long arg)
+{
+	struct efi_resetsystem __user *resetsystem_user;
+	struct efi_resetsystem resetsystem;
+	void *data = NULL;
+
+	resetsystem_user = (struct efi_resetsystem __user *)arg;
+	if (copy_from_user(&resetsystem, resetsystem_user,
+						sizeof(resetsystem)))
+		return -EFAULT;
+	if (resetsystem.data_size != 0) {
+		data = memdup_user((void *)resetsystem.data,
+						resetsystem.data_size);
+		if (IS_ERR(data))
+			return PTR_ERR(data);
+	}
+
+	efi.reset_system(resetsystem.reset_type, resetsystem.status,
+				resetsystem.data_size, (efi_char16_t *)data);
+
+	kfree(data);
+	return 0;
+}
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 1, 0)
 static long efi_runtime_query_variableinfo(unsigned long arg)
diff --git a/efi_runtime/efi_runtime.h b/efi_runtime/efi_runtime.h
index fa67a80..4cf8e51 100644
--- a/efi_runtime/efi_runtime.h
+++ b/efi_runtime/efi_runtime.h
@@ -94,6 +94,13 @@ struct efi_querycapsulecapabilities {
 	efi_status_t		*status;
 } __packed;
 
+struct efi_resetsystem {
+	int			reset_type;
+	efi_status_t		status;
+	unsigned long		data_size;
+	efi_char16_t		*data;
+} __packed;
+
 /* ioctl calls that are permitted to the /dev/efi_runtime interface. */
 #define EFI_RUNTIME_GET_VARIABLE \
 	_IOWR('p', 0x01, struct efi_getvariable)
@@ -122,4 +129,7 @@ struct efi_querycapsulecapabilities {
 #define EFI_RUNTIME_QUERY_CAPSULECAPABILITIES \
 	_IOR('p', 0x0A, struct efi_querycapsulecapabilities)
 
+#define EFI_RUNTIME_RESET_SYSTEM \
+	_IOW('p', 0x0B, struct efi_resetsystem)
+
 #endif /* _EFI_RUNTIME_H_ */
-- 
2.7.4