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>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c
index f61285d5edc3..06264e8b58d9 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