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path: root/drivers/acpi/resources/rslist.c
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Diffstat (limited to 'drivers/acpi/resources/rslist.c')
-rw-r--r--drivers/acpi/resources/rslist.c102
1 files changed, 45 insertions, 57 deletions
diff --git a/drivers/acpi/resources/rslist.c b/drivers/acpi/resources/rslist.c
index 1434e786477e..29423ce030ca 100644
--- a/drivers/acpi/resources/rslist.c
+++ b/drivers/acpi/resources/rslist.c
@@ -51,76 +51,62 @@ ACPI_MODULE_NAME("rslist")
*
* FUNCTION: acpi_rs_convert_aml_to_resources
*
- * PARAMETERS: Aml - Pointer to the resource byte stream
- * aml_length - Length of Aml
- * output_buffer - Pointer to the buffer that will
- * contain the output structures
+ * PARAMETERS: acpi_walk_aml_callback
+ * resource_ptr - Pointer to the buffer that will
+ * contain the output structures
*
* RETURN: Status
*
- * DESCRIPTION: Takes the resource byte stream and parses it, creating a
- * linked list of resources in the caller's output buffer
+ * DESCRIPTION: Convert an AML resource to an internal representation of the
+ * resource that is aligned and easier to access.
*
******************************************************************************/
acpi_status
-acpi_rs_convert_aml_to_resources(u8 * aml, u32 aml_length, u8 * output_buffer)
+acpi_rs_convert_aml_to_resources(u8 * aml,
+ u32 length,
+ u32 offset, u8 resource_index, void **context)
{
- struct acpi_resource *resource = (void *)output_buffer;
+ struct acpi_resource **resource_ptr =
+ ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
+ struct acpi_resource *resource;
acpi_status status;
- u8 resource_index;
- u8 *end_aml;
-
- ACPI_FUNCTION_TRACE("rs_convert_aml_to_resources");
-
- end_aml = aml + aml_length;
-
- /* Loop until end-of-buffer or an end_tag is found */
-
- while (aml < end_aml) {
- /* Validate the Resource Type and Resource Length */
-
- status = acpi_ut_validate_resource(aml, &resource_index);
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
- }
- /* Convert the AML byte stream resource to a local resource struct */
-
- status =
- acpi_rs_convert_aml_to_resource(resource,
- ACPI_CAST_PTR(union
- aml_resource,
- aml),
- acpi_gbl_get_resource_dispatch
- [resource_index]);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Could not convert AML resource (Type %X)",
- *aml));
- return_ACPI_STATUS(status);
- }
+ ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
- /* Normal exit on completion of an end_tag resource descriptor */
-
- if (acpi_ut_get_resource_type(aml) ==
- ACPI_RESOURCE_NAME_END_TAG) {
- return_ACPI_STATUS(AE_OK);
- }
-
- /* Point to the next input AML resource */
-
- aml += acpi_ut_get_descriptor_length(aml);
-
- /* Point to the next structure in the output buffer */
+ /*
+ * Check that the input buffer and all subsequent pointers into it
+ * are aligned on a native word boundary. Most important on IA64
+ */
+ resource = *resource_ptr;
+ if (ACPI_IS_MISALIGNED(resource)) {
+ ACPI_WARNING((AE_INFO,
+ "Misaligned resource pointer %p", resource));
+ }
- resource =
- ACPI_ADD_PTR(struct acpi_resource, resource,
- resource->length);
+ /* Convert the AML byte stream resource to a local resource struct */
+
+ status =
+ acpi_rs_convert_aml_to_resource(resource,
+ ACPI_CAST_PTR(union aml_resource,
+ aml),
+ acpi_gbl_get_resource_dispatch
+ [resource_index]);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Could not convert AML resource (Type %X)",
+ *aml));
+ return_ACPI_STATUS(status);
}
- /* Did not find an end_tag resource descriptor */
+ ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
+ "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
+ acpi_ut_get_resource_type(aml), length,
+ resource->length));
- return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
+ /* Point to the next structure in the output buffer */
+
+ *resource_ptr = ACPI_ADD_PTR(void, resource, resource->length);
+ return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
@@ -150,11 +136,12 @@ acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
u8 *end_aml = output_buffer + aml_size_needed;
acpi_status status;
- ACPI_FUNCTION_TRACE("rs_convert_resources_to_aml");
+ ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
/* Walk the resource descriptor list, convert each descriptor */
while (aml < end_aml) {
+
/* Validate the (internal) Resource Type */
if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
@@ -191,6 +178,7 @@ acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
/* Check for end-of-list, normal exit */
if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
+
/* An End Tag indicates the end of the input Resource Template */
return_ACPI_STATUS(AE_OK);