ACPICA: acpiexec: Add support for AML files containing multiple tables

ACPICA commit 301f16e4037275888f65b88aec7231c1cd64339f

Add support for multi-AML-table files that originate from
either acpixtract or iASL.

Link: https://github.com/acpica/acpica/commit/301f16e4
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/acutils.h

@@ -356,6 +356,10 @@ acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
  * utfileio - file operations
  */
 #ifdef ACPI_APPLICATION
+
+acpi_status
+acpi_ut_read_tables_from_file(FILE * file, struct acpi_table_header **table);
+
 acpi_status
 acpi_ut_read_table_from_file(char *filename, struct acpi_table_header **table);
 #endif

drivers/acpi/acpica/utfileio.c

@@ -291,6 +291,29 @@ acpi_ut_read_table(FILE * fp,
  *
  ******************************************************************************/
 
+acpi_status
+acpi_ut_read_tables_from_file(FILE * file, struct acpi_table_header ** table)
+{
+	struct acpi_table_header table_header;
+	s32 count;
+	long position;
+
+	position = ftell(file);
+	count = fread(&table_header, 1, sizeof(struct acpi_table_header), file);
+	if (count < sizeof(struct acpi_table_header)) {
+		return (AE_CTRL_TERMINATE);
+	}
+
+	/* Allocate a buffer for the table */
+
+	*table = acpi_os_allocate((size_t) table_header.length);
+	fseek(file, position, SEEK_SET);
+
+	count = fread(*table, 1, table_header.length, file);
+
+	return (AE_OK);
+}
+
 acpi_status
 acpi_ut_read_table_from_file(char *filename, struct acpi_table_header ** table)
 {