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authorBob Moore <robert.moore@intel.com>2011-11-16 14:51:01 +0800
committerLen Brown <len.brown@intel.com>2012-01-17 03:36:31 -0500
commit0e243178047c0219b3367dd44f81040826b7ea83 (patch)
treedcf5bbcbfae157a072a94ced21e949fd7de7ba90 /drivers/acpi/acpica
parenta91cdde20a870bd773d605c764ed211539bf3020 (diff)
ACPI 5.0: New interface, acpi_buffer_to_resource
This interface converts an AML buffer to an internal ACPI_RESOURCE. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
-rw-r--r--drivers/acpi/acpica/rscreate.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c
index f61285d5edc..06264e8b58d 100644
--- a/drivers/acpi/acpica/rscreate.c
+++ b/drivers/acpi/acpica/rscreate.c
@@ -51,6 +51,70 @@ ACPI_MODULE_NAME("rscreate")
/*******************************************************************************
*
+ * FUNCTION: acpi_buffer_to_resource
+ *
+ * PARAMETERS: aml_buffer - Pointer to the resource byte stream
+ * aml_buffer_length - Length of the aml_buffer
+ * resource_ptr - Where the converted resource is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Convert a raw AML buffer to a resource list
+ *
+ ******************************************************************************/
+acpi_status
+acpi_buffer_to_resource(u8 *aml_buffer,
+ u16 aml_buffer_length,
+ struct acpi_resource **resource_ptr)
+{
+ acpi_status status;
+ acpi_size list_size_needed;
+ void *resource;
+ void *current_resource_ptr;
+
+ /*
+ * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag
+ * is not required here.
+ */
+
+ /* Get the required length for the converted resource */
+
+ status = acpi_rs_get_list_length(aml_buffer, aml_buffer_length,
+ &list_size_needed);
+ if (status == AE_AML_NO_RESOURCE_END_TAG) {
+ status = AE_OK;
+ }
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ /* Allocate a buffer for the converted resource */
+
+ resource = ACPI_ALLOCATE_ZEROED(list_size_needed);
+ current_resource_ptr = resource;
+ if (!resource) {
+ return (AE_NO_MEMORY);
+ }
+
+ /* Perform the AML-to-Resource conversion */
+
+ status = acpi_ut_walk_aml_resources(aml_buffer, aml_buffer_length,
+ acpi_rs_convert_aml_to_resources,
+ &current_resource_ptr);
+ if (status == AE_AML_NO_RESOURCE_END_TAG) {
+ status = AE_OK;
+ }
+ if (ACPI_FAILURE(status)) {
+ ACPI_FREE(resource);
+ } else {
+ *resource_ptr = resource;
+ }
+
+ return (status);
+}
+
+/*******************************************************************************
+ *
* FUNCTION: acpi_rs_create_resource_list
*
* PARAMETERS: aml_buffer - Pointer to the resource byte stream