GUID-identified vendor data resources

@@ -410,3 +410,100 @@
 
 	return (AE_OK);
 }
+
+struct acpi_vendor_info {
+	struct acpi_vendor_descriptor	*descriptor;
+	int				found;
+	u8				*data;
+	u32				length;
+};
+
+static acpi_status
+acpi_vendor_resource_match (
+	struct acpi_resource		*resource,
+	void				*context)
+{
+	struct acpi_vendor_info		*info = (struct acpi_vendor_info *) context;
+	struct acpi_resource_vendor	*vendor;
+	struct acpi_vendor_descriptor	*descriptor;
+
+	if (resource->id != ACPI_RSTYPE_VENDOR)
+		return AE_OK;
+
+	vendor = (struct acpi_resource_vendor *) &resource->data;
+	descriptor = (struct acpi_vendor_descriptor *) vendor->reserved;
+	if (vendor->length < sizeof(struct acpi_vendor_descriptor) ||
+	    descriptor->guid_id != info->descriptor->guid_id ||
+	    efi_guidcmp(descriptor->guid, info->descriptor->guid))
+		return AE_OK;
+
+	info->found = 1;
+	info->length = vendor->length - sizeof(struct acpi_vendor_descriptor);
+	if (!info->length)
+		return AE_CTRL_TERMINATE;	/* descriptor, but no payload */
+
+	info->data = acpi_os_allocate(info->length);
+	if (!info->data)
+		return AE_NO_MEMORY;
+
+	memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), info->length);
+	return AE_CTRL_TERMINATE;
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_find_vendor_resource
+ *
+ * PARAMETERS:  device_handle   - a handle to the device object for the
+ *                                device we are querying
+ *              id		- a pointer to descriptor for desired
+ *				  vendor resource
+ *              data		- (out) a pointer to a pointer where payload
+ *                                data is returned
+ *              length		- (out) a pointer to the length of payload
+ *				  data
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: This function evaluates the object's _CRS method and
+ *		searches the result for a large vendor-defined resource
+ *		identified by the supplied GUID and subtype.  If such
+ *		a resource is found, a pointer to the payload data is
+ *		returned, along with the length of the payload data.
+ *
+ *		The caller is responsible for deallocating the buffer
+ *		returned in "data" with acpi_os_free().
+ *
+ *		If the function fails, "data" and "length" are
+ *		unchanged.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_find_vendor_resource (
+	acpi_handle			device_handle,
+	struct acpi_vendor_descriptor	*id,
+	u8				**data,
+	u32				*length)
+{
+	struct acpi_vendor_info		info;
+	acpi_status			status;
+
+
+	ACPI_FUNCTION_TRACE ("acpi_find_vendor_resource");
+
+
+	info.descriptor = id;
+	info.found = 0;
+	info.data = 0;
+
+	status = acpi_walk_resources(device_handle, METHOD_NAME__CRS,
+		acpi_vendor_resource_match, &info);
+	if (ACPI_FAILURE(status) || !info.found)
+		return_ACPI_STATUS (AE_NOT_FOUND);
+
+	*data = info.data;
+	*length = info.length;
+	return_ACPI_STATUS (AE_OK);
+}

@@ -412,6 +412,18 @@
 	struct acpi_resource            *resource,
 	struct acpi_resource_address64 *out);
 
+struct acpi_vendor_descriptor {
+	u8				guid_id;
+	efi_guid_t			guid;
+};
+
+acpi_status
+acpi_find_vendor_resource (
+	acpi_handle			obj,
+	struct acpi_vendor_descriptor	*id,
+	u8				**data,
+	u32				*length);
+
 /*
  * Hardware (ACPI device) interfaces
  */

@@ -52,6 +52,7 @@
 #ifdef __KERNEL__
 
 #include <linux/config.h>
+#include <linux/efi.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/ctype.h>