void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
{
const char *next_external_char;
u32 i;
ACPI_FUNCTION_ENTRY();
next_external_char = info->external_name;
info->num_carats = 0;
info->num_segments = 0;
info->fully_qualified = FALSE;
/*
* For the internal name, the required length is 4 bytes per segment, plus
* 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
* (which is not really needed, but no there's harm in putting it there)
*
* strlen() + 1 covers the first name_seg, which has no path separator
*/
if (acpi_ns_valid_root_prefix(*next_external_char)) {
info->fully_qualified = TRUE;
next_external_char++;
/* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
while (acpi_ns_valid_root_prefix(*next_external_char)) {
next_external_char++;
}
} else {
/* Handle Carat prefixes */
while (*next_external_char == '^') {
info->num_carats++;
next_external_char++;
}
}
/*
* Determine the number of ACPI name "segments" by counting the number of
* path separators within the string. Start with one segment since the
* segment count is [(# separators) + 1], and zero separators is ok.
*/
if (*next_external_char) {
info->num_segments = 1;
for (i = 0; next_external_char[i]; i++) {
if (acpi_ns_valid_path_separator(next_external_char[i])) {
info->num_segments++;
}
}
}
info->length = (ACPI_NAME_SIZE * info->num_segments) +
4 + info->num_carats;
info->next_external_char = next_external_char;
}
/******************************************************************************
*
* FUNCTION: acpi_get_handle
*
* PARAMETERS: Parent - Object to search under (search scope).
* Pathname - Pointer to an asciiz string containing the
* name
* ret_handle - Where the return handle is returned
*
* RETURN: Status
*
* DESCRIPTION: This routine will search for a caller specified name in the
* name space. The caller can restrict the search region by
* specifying a non NULL parent. The parent value is itself a
* namespace handle.
*
******************************************************************************/
acpi_status
acpi_get_handle(acpi_handle parent,
acpi_string pathname, acpi_handle * ret_handle)
{
acpi_status status;
struct acpi_namespace_node *node = NULL;
struct acpi_namespace_node *prefix_node = NULL;
ACPI_FUNCTION_ENTRY();
/* Parameter Validation */
if (!ret_handle || !pathname) {
return (AE_BAD_PARAMETER);
}
/* Convert a parent handle to a prefix node */
if (parent) {
prefix_node = acpi_ns_map_handle_to_node(parent);
if (!prefix_node) {
return (AE_BAD_PARAMETER);
}
}
/*
* Valid cases are:
* 1) Fully qualified pathname
* 2) Parent + Relative pathname
*
* Error for <null Parent + relative path>
*/
if (acpi_ns_valid_root_prefix(pathname[0])) {
/* Pathname is fully qualified (starts with '\') */
/* Special case for root-only, since we can't search for it */
if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
*ret_handle =
acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
return (AE_OK);
}
} else if (!prefix_node) {
/* Relative path with null prefix is disallowed */
return (AE_BAD_PARAMETER);
}
/* Find the Node and convert to a handle */
status =
acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_SUCCESS(status)) {
*ret_handle = acpi_ns_convert_entry_to_handle(node);
}
return (status);
}
acpi_status
acpi_ns_get_internal_name_length (
acpi_namestring_info *info)
{
NATIVE_CHAR *next_external_char;
u32 i;
FUNCTION_ENTRY ();
next_external_char = info->external_name;
info->num_carats = 0;
info->num_segments = 0;
info->fully_qualified = FALSE;
/*
* For the internal name, the required length is 4 bytes
* per segment, plus 1 each for Root_prefix, Multi_name_prefix_op,
* segment count, trailing null (which is not really needed,
* but no there's harm in putting it there)
*
* strlen() + 1 covers the first Name_seg, which has no
* path separator
*/
if (acpi_ns_valid_root_prefix (next_external_char[0])) {
info->fully_qualified = TRUE;
next_external_char++;
}
else {
/*
* Handle Carat prefixes
*/
while (*next_external_char == '^') {
info->num_carats++;
next_external_char++;
}
}
/*
* Determine the number of ACPI name "segments" by counting
* the number of path separators within the string. Start
* with one segment since the segment count is (# separators)
* + 1, and zero separators is ok.
*/
if (*next_external_char) {
info->num_segments = 1;
for (i = 0; next_external_char[i]; i++) {
if (acpi_ns_valid_path_separator (next_external_char[i])) {
info->num_segments++;
}
}
}
info->length = (ACPI_NAME_SIZE * info->num_segments) +
4 + info->num_carats;
info->next_external_char = next_external_char;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_evaluate_object
*
* PARAMETERS: Handle - Object handle (optional)
* Pathname - Object pathname (optional)
* external_params - List of parameters to pass to method,
* terminated by NULL. May be NULL
* if no parameters are being passed.
* return_buffer - Where to put method's return value (if
* any). If NULL, no value is returned.
*
* RETURN: Status
*
* DESCRIPTION: Find and evaluate the given object, passing the given
* parameters if necessary. One of "Handle" or "Pathname" must
* be valid (non-null)
*
******************************************************************************/
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;
struct acpi_evaluate_info *info;
acpi_size buffer_space_needed;
u32 i;
ACPI_FUNCTION_TRACE(acpi_evaluate_object);
/* Allocate and initialize the evaluation information block */
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
if (!info) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
info->pathname = pathname;
info->parameter_type = ACPI_PARAM_ARGS;
/* Convert and validate the device handle */
info->prefix_node = acpi_ns_map_handle_to_node(handle);
if (!info->prefix_node) {
status = AE_BAD_PARAMETER;
goto cleanup;
}
/*
* If there are parameters to be passed to a control method, the external
* objects must all 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_ALLOCATE_ZEROED(((acpi_size)
external_params->
count +
1) * sizeof(void *));
if (!info->parameters) {
status = AE_NO_MEMORY;
goto cleanup;
}
/* 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)) {
goto cleanup;
}
}
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 */
info->prefix_node = NULL;
status = acpi_ns_evaluate(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_INFO,
"Both Handle and Pathname are NULL"));
} else {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Null Handle with relative pathname [%s]",
pathname));
}
status = AE_BAD_PARAMETER;
} else {
/* We have a namespace a node and a possible relative path */
status = acpi_ns_evaluate(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)) {
/* Get the size of 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.
*/
acpi_ex_enter_interpreter();
/* Remove one reference on the return object (should delete it) */
acpi_ut_remove_reference(info->return_object);
acpi_ex_exit_interpreter();
}
cleanup:
/* 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);
}
ACPI_FREE(info);
return_ACPI_STATUS(status);
}
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);
}