acpi_status
acpi_evaluate_object (
acpi_handle handle,
acpi_string pathname,
struct acpi_object_list *external_params,
struct acpi_buffer *return_buffer)
{
acpi_status status;
acpi_status status2;
struct acpi_parameter_info info;
acpi_size buffer_space_needed;
u32 i;
ACPI_FUNCTION_TRACE ("acpi_evaluate_object");
info.node = handle;
info.parameters = NULL;
info.return_object = NULL;
info.parameter_type = ACPI_PARAM_ARGS;
/*
* If there are parameters to be passed to the object
* (which must be a control method), the external objects
* must be converted to internal objects
*/
if (external_params && external_params->count) {
/*
* Allocate a new parameter block for the internal objects
* Add 1 to count to allow for null terminated internal list
*/
info.parameters = ACPI_MEM_CALLOCATE (
((acpi_size) external_params->count + 1) *
sizeof (void *));
if (!info.parameters) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/*
* Convert each external object in the list to an
* internal object
*/
for (i = 0; i < external_params->count; i++) {
status = acpi_ut_copy_eobject_to_iobject (&external_params->pointer[i],
&info.parameters[i]);
if (ACPI_FAILURE (status)) {
acpi_ut_delete_internal_object_list (info.parameters);
return_ACPI_STATUS (status);
}
}
info.parameters[external_params->count] = NULL;
}
/*
* Three major cases:
* 1) Fully qualified pathname
* 2) No handle, not fully qualified pathname (error)
* 3) Valid handle
*/
if ((pathname) &&
(acpi_ns_valid_root_prefix (pathname[0]))) {
/*
* The path is fully qualified, just evaluate by name
*/
status = acpi_ns_evaluate_by_name (pathname, &info);
}
else if (!handle) {
/*
* A handle is optional iff a fully qualified pathname
* is specified. Since we've already handled fully
* qualified names above, this is an error
*/
if (!pathname) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Both Handle and Pathname are NULL\n"));
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Handle is NULL and Pathname is relative\n"));
}
status = AE_BAD_PARAMETER;
}
else {
/*
* We get here if we have a handle -- and if we have a
* pathname it is relative. The handle will be validated
* in the lower procedures
*/
if (!pathname) {
/*
* The null pathname case means the handle is for
* the actual object to be evaluated
*/
status = acpi_ns_evaluate_by_handle (&info);
}
else {
/*
* Both a Handle and a relative Pathname
*/
status = acpi_ns_evaluate_relative (pathname, &info);
}
}
/*
* If we are expecting a return value, and all went well above,
* copy the return value to an external object.
*/
if (return_buffer) {
if (!info.return_object) {
return_buffer->length = 0;
}
else {
if (ACPI_GET_DESCRIPTOR_TYPE (info.return_object) == ACPI_DESC_TYPE_NAMED) {
/*
* If we received a NS Node as a return object, this means that
* the object we are evaluating has nothing interesting to
* return (such as a mutex, etc.) We return an error because
* these types are essentially unsupported by this interface.
* We don't check up front because this makes it easier to add
* support for various types at a later date if necessary.
*/
status = AE_TYPE;
info.return_object = NULL; /* No need to delete a NS Node */
return_buffer->length = 0;
}
if (ACPI_SUCCESS (status)) {
/*
* Find out how large a buffer is needed
* to contain the returned object
*/
status = acpi_ut_get_object_size (info.return_object,
&buffer_space_needed);
if (ACPI_SUCCESS (status)) {
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer (return_buffer, buffer_space_needed);
if (ACPI_FAILURE (status)) {
/*
* Caller's buffer is too small or a new one can't be allocated
*/
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Needed buffer size %X, %s\n",
(u32) buffer_space_needed,
acpi_format_exception (status)));
}
else {
/*
* We have enough space for the object, build it
*/
status = acpi_ut_copy_iobject_to_eobject (info.return_object,
return_buffer);
}
}
}
}
}
if (info.return_object) {
/*
* Delete the internal return object. NOTE: Interpreter
* must be locked to avoid race condition.
*/
status2 = acpi_ex_enter_interpreter ();
if (ACPI_SUCCESS (status2)) {
/*
* Delete the internal return object. (Or at least
* decrement the reference count by one)
*/
acpi_ut_remove_reference (info.return_object);
acpi_ex_exit_interpreter ();
}
}
/*
* Free the input parameter list (if we created one),
*/
if (info.parameters) {
/* Free the allocated parameter block */
acpi_ut_delete_internal_object_list (info.parameters);
}
return_ACPI_STATUS (status);
}
ACPI_STATUS
acpi_evaluate_object (
ACPI_HANDLE handle,
ACPI_STRING pathname,
ACPI_OBJECT_LIST *param_objects,
ACPI_BUFFER *return_buffer)
{
ACPI_STATUS status;
ACPI_OPERAND_OBJECT **param_ptr = NULL;
ACPI_OPERAND_OBJECT *return_obj = NULL;
ACPI_OPERAND_OBJECT *object_ptr = NULL;
u32 buffer_space_needed;
u32 user_buffer_length;
u32 count;
u32 i;
u32 param_length;
u32 object_length;
/*
* If there are parameters to be passed to the object
* (which must be a control method), the external objects
* must be converted to internal objects
*/
if (param_objects && param_objects->count) {
/*
* Allocate a new parameter block for the internal objects
* Add 1 to count to allow for null terminated internal list
*/
count = param_objects->count;
param_length = (count + 1) * sizeof (void *);
object_length = count * sizeof (ACPI_OPERAND_OBJECT);
param_ptr = acpi_cm_callocate (param_length + /* Parameter List part */
object_length); /* Actual objects */
if (!param_ptr) {
return (AE_NO_MEMORY);
}
object_ptr = (ACPI_OPERAND_OBJECT *) ((u8 *) param_ptr +
param_length);
/*
* Init the param array of pointers and NULL terminate
* the list
*/
for (i = 0; i < count; i++) {
param_ptr[i] = &object_ptr[i];
acpi_cm_init_static_object (&object_ptr[i]);
}
param_ptr[count] = NULL;
/*
* Convert each external object in the list to an
* internal object
*/
for (i = 0; i < count; i++) {
status =
acpi_cm_build_internal_object (¶m_objects->pointer[i],
param_ptr[i]);
if (ACPI_FAILURE (status)) {
acpi_cm_delete_internal_object_list (param_ptr);
return (status);
}
}
}
/*
* Three major cases:
* 1) Fully qualified pathname
* 2) No handle, not fully qualified pathname (error)
* 3) Valid handle
*/
if ((pathname) &&
(acpi_ns_valid_root_prefix (pathname[0])))
{
/*
* The path is fully qualified, just evaluate by name
*/
status = acpi_ns_evaluate_by_name (pathname, param_ptr, &return_obj);
}
else if (!handle) {
/*
* A handle is optional iff a fully qualified pathname
* is specified. Since we've already handled fully
* qualified names above, this is an error
*/
status = AE_BAD_PARAMETER;
}
else {
/*
* We get here if we have a handle -- and if we have a
* pathname it is relative. The handle will be validated
* in the lower procedures
*/
if (!pathname) {
/*
* The null pathname case means the handle is for
* the actual object to be evaluated
*/
status = acpi_ns_evaluate_by_handle (handle, param_ptr, &return_obj);
}
else {
/*
* Both a Handle and a relative Pathname
*/
status = acpi_ns_evaluate_relative (handle, pathname, param_ptr,
&return_obj);
}
}
/*
* If we are expecting a return value, and all went well above,
* copy the return value to an external object.
*/
if (return_buffer) {
user_buffer_length = return_buffer->length;
return_buffer->length = 0;
if (return_obj) {
if (VALID_DESCRIPTOR_TYPE (return_obj, ACPI_DESC_TYPE_NAMED)) {
/*
* If we got an Node as a return object,
* this means the object we are evaluating
* has nothing interesting to return (such
* as a mutex, etc.) We return an error
* because these types are essentially
* unsupported by this interface. We
* don't check up front because this makes
* it easier to add support for various
* types at a later date if necessary.
*/
status = AE_TYPE;
return_obj = NULL; /* No need to delete an Node */
}
if (ACPI_SUCCESS (status)) {
/*
* Find out how large a buffer is needed
* to contain the returned object
*/
status = acpi_cm_get_object_size (return_obj,
&buffer_space_needed);
if (ACPI_SUCCESS (status)) {
/*
* Check if there is enough room in the
* caller's buffer
*/
if (user_buffer_length < buffer_space_needed) {
/*
* Caller's buffer is too small, can't
* give him partial results fail the call
* but return the buffer size needed
*/
return_buffer->length = buffer_space_needed;
status = AE_BUFFER_OVERFLOW;
}
else {
/*
* We have enough space for the object, build it
*/
status = acpi_cm_build_external_object (return_obj,
return_buffer);
return_buffer->length = buffer_space_needed;
}
}
}
}
}
/* Delete the return and parameter objects */
if (return_obj) {
/*
* Delete the internal return object. (Or at least
* decrement the reference count by one)
*/
acpi_cm_remove_reference (return_obj);
}
/*
* Free the input parameter list (if we created one),
*/
if (param_ptr) {
/* Free the allocated parameter block */
acpi_cm_delete_internal_object_list (param_ptr);
}
return (status);
}
