acpi/acpica/utstate.c

4  * Module Name: utstate - state object support procedures
18  * PARAMETERS:  list_head           - Head of the state stack
19  *              state               - State object to push
23  * DESCRIPTION: Push a state object onto a state stack
28 			   union acpi_generic_state *state)
32 	/* Push the state object onto the front of the list (stack) */
34 	state->common.next = *list_head;
35 	*list_head = state;
43  * PARAMETERS:  list_head           - Head of the state stack
45  * RETURN:      The popped state object
47  * DESCRIPTION: Pop a state object from a state stack
54 	union acpi_generic_state *state;
58 	/* Remove the state object at the head of the list (stack) */
60 	state = *list_head;
61 	if (state) {
65 		*list_head = state->common.next;
68 	return (state);
77  * RETURN:      The new state object. NULL on failure.
79  * DESCRIPTION: Create a generic state object. Attempt to obtain one from
80  *              the global state cache;  If none available, create a new one.
86 	union acpi_generic_state *state;
90 	state = acpi_os_acquire_object(acpi_gbl_state_cache);
91 	if (state) {
94 		state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
97 	return (state);
108  * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
115 	union acpi_generic_state *state;
119 	/* Create the generic state object */
121 	state = acpi_ut_create_generic_state();
122 	if (!state) {
128 	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
129 	state->thread.thread_id = acpi_os_get_thread_id();
133 	if (!state->thread.thread_id) {
135 		state->thread.thread_id = (acpi_thread_id) 1;
138 	return ((struct acpi_thread_state *)state);
145  * PARAMETERS:  object          - Initial Object to be installed in the state
148  * RETURN:      New state object, null on failure
150  * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
159 	union acpi_generic_state *state;
163 	/* Create the generic state object */
165 	state = acpi_ut_create_generic_state();
166 	if (!state) {
172 	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
173 	state->update.object = object;
174 	state->update.value = action;
175 	return (state);
182  * PARAMETERS:  object          - Initial Object to be installed in the state
185  * RETURN:      New state object, null on failure
195 	union acpi_generic_state *state;
199 	/* Create the generic state object */
201 	state = acpi_ut_create_generic_state();
202 	if (!state) {
208 	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
209 	state->pkg.source_object = (union acpi_operand_object *)internal_object;
210 	state->pkg.dest_object = external_object;
211 	state->pkg.index = index;
212 	state->pkg.num_packages = 1;
214 	return (state);
223  * RETURN:      New state object, null on failure
225  * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
232 	union acpi_generic_state *state;
236 	/* Create the generic state object */
238 	state = acpi_ut_create_generic_state();
239 	if (!state) {
245 	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
246 	state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
248 	return (state);
255  * PARAMETERS:  state               - The state object to be deleted
259  * DESCRIPTION: Release a state object to the state cache. NULL state objects
264 void acpi_ut_delete_generic_state(union acpi_generic_state *state)
268 	/* Ignore null state */
270 	if (state) {
271 		(void)acpi_os_release_object(acpi_gbl_state_cache, state);