ACPICA: Add support to externally execute _OSI method

The current implemenation of _OSI within ACPICA only allows other
control methods to execute _OSI. This change allows the host
OS to execute _OSI via the AcpiEvaluateObject interface. _OSI
is a special method -- it does not exist in the AML code, it is
implemented within ACPICA.

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>

2 files changed, 21 insertions, 0 deletions

diff --git a/drivers/acpi/parser/psparse.c b/drivers/acpi/parser/psparse.c
index dfd3d9028018..5156203883d7 100644
--- a/drivers/acpi/parser/psparse.c
+++ b/drivers/acpi/parser/psparse.c
@@ -447,6 +447,10 @@ acpi_status acpi_ps_parse_aml(struct acpi_walk_state *walk_state)
                           walk_state, walk_state->parser_state.aml,
                           walk_state->parser_state.aml_size));
 
+        if (!walk_state->parser_state.aml) {
+                return_ACPI_STATUS(AE_NULL_OBJECT);
+        }
+
         /* Create and initialize a new thread state */
 
         thread = acpi_ut_create_thread_state();
diff --git a/drivers/acpi/parser/psxface.c b/drivers/acpi/parser/psxface.c
index 270469aae842..4985ce58c024 100644
--- a/drivers/acpi/parser/psxface.c
+++ b/drivers/acpi/parser/psxface.c
@@ -45,6 +45,7 @@
 #include <acpi/acparser.h>
 #include <acpi/acdispat.h>
 #include <acpi/acinterp.h>
+#include <acpi/amlcode.h>
 
 #define _COMPONENT          ACPI_PARSER
 ACPI_MODULE_NAME("psxface")
@@ -278,6 +279,22 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
                 goto cleanup;
         }
 
+        /* Invoke an internal method if necessary */
+
+        if (info->obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
+                status = info->obj_desc->method.implementation(walk_state);
+                info->return_object = walk_state->return_desc;
+
+                /* Cleanup states */
+
+                acpi_ds_scope_stack_clear(walk_state);
+                acpi_ps_cleanup_scope(&walk_state->parser_state);
+                acpi_ds_terminate_control_method(walk_state->method_desc,
+                                                 walk_state);
+                acpi_ds_delete_walk_state(walk_state);
+                goto cleanup;
+        }
+
         /* Parse the AML */
 
         status = acpi_ps_parse_aml(walk_state);