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authorLv Zheng <lv.zheng@intel.com>2013-03-08 13:23:32 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-03-12 03:45:05 +0400
commit88fd0ac831095f52691810a3b832e884766c657e (patch)
tree4fb3b79e8773ecc4f4c012dc09119c9cab92ced4 /drivers/acpi/acpica/nsconvert.c
parent96b44cc684b315dbcf77191809df011067f2e206 (diff)
downloadlinux-88fd0ac831095f52691810a3b832e884766c657e.tar.xz
ACPICA: Return object repair: Add resource template repairs
Fixes several possible problems with resource templates returned by _CRS/_PRS/_DMA predefined names. Lv Zheng. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/nsconvert.c')
-rw-r--r--drivers/acpi/acpica/nsconvert.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsconvert.c b/drivers/acpi/acpica/nsconvert.c
index 84f66994256f..8f79a9d2d50e 100644
--- a/drivers/acpi/acpica/nsconvert.c
+++ b/drivers/acpi/acpica/nsconvert.c
@@ -364,3 +364,80 @@ acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
*return_object = new_object;
return (AE_OK);
}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_convert_to_resource
+ *
+ * PARAMETERS: original_object - Object to be converted
+ * return_object - Where the new converted object is returned
+ *
+ * RETURN: Status. AE_OK if conversion was successful
+ *
+ * DESCRIPTION: Attempt to convert a Integer object to a resource_template
+ * Buffer.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
+ union acpi_operand_object **return_object)
+{
+ union acpi_operand_object *new_object;
+ u8 *buffer;
+
+ /*
+ * We can fix the following cases for an expected resource template:
+ * 1. No return value (interpreter slack mode is disabled)
+ * 2. A "Return (Zero)" statement
+ * 3. A "Return empty buffer" statement
+ *
+ * We will return a buffer containing a single end_tag
+ * resource descriptor.
+ */
+ if (original_object) {
+ switch (original_object->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ /* We can only repair an Integer==0 */
+
+ if (original_object->integer.value) {
+ return (AE_AML_OPERAND_TYPE);
+ }
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ if (original_object->buffer.length) {
+
+ /* Additional checks can be added in the future */
+
+ *return_object = NULL;
+ return (AE_OK);
+ }
+ break;
+
+ case ACPI_TYPE_STRING:
+ default:
+
+ return (AE_AML_OPERAND_TYPE);
+ }
+ }
+
+ /* Create the new buffer object for the resource descriptor */
+
+ new_object = acpi_ut_create_buffer_object(2);
+ if (!new_object) {
+ return (AE_NO_MEMORY);
+ }
+
+ buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
+
+ /* Initialize the Buffer with a single end_tag descriptor */
+
+ buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
+ buffer[1] = 0x00;
+
+ *return_object = new_object;
+ return (AE_OK);
+}