1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/utstate.c b/drivers/acpi/acpica/utstate.c
new file mode 100644
index 0000000000..a2484556a6
--- /dev/null
+++ b/drivers/acpi/acpica/utstate.c
@@ -0,0 +1,275 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/*******************************************************************************
+ *
+ * Module Name: utstate - state object support procedures
+ *
+ ******************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_UTILITIES
+ACPI_MODULE_NAME("utstate")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_push_generic_state
+ *
+ * PARAMETERS:  list_head           - Head of the state stack
+ *              state               - State object to push
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Push a state object onto a state stack
+ *
+ ******************************************************************************/
+void
+acpi_ut_push_generic_state(union acpi_generic_state **list_head,
+			   union acpi_generic_state *state)
+{
+	ACPI_FUNCTION_ENTRY();
+
+	/* Push the state object onto the front of the list (stack) */
+
+	state->common.next = *list_head;
+	*list_head = state;
+	return;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_pop_generic_state
+ *
+ * PARAMETERS:  list_head           - Head of the state stack
+ *
+ * RETURN:      The popped state object
+ *
+ * DESCRIPTION: Pop a state object from a state stack
+ *
+ ******************************************************************************/
+
+union acpi_generic_state *acpi_ut_pop_generic_state(union acpi_generic_state
+						    **list_head)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Remove the state object at the head of the list (stack) */
+
+	state = *list_head;
+	if (state) {
+
+		/* Update the list head */
+
+		*list_head = state->common.next;
+	}
+
+	return (state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_create_generic_state
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      The new state object. NULL on failure.
+ *
+ * DESCRIPTION: Create a generic state object. Attempt to obtain one from
+ *              the global state cache;  If none available, create a new one.
+ *
+ ******************************************************************************/
+
+union acpi_generic_state *acpi_ut_create_generic_state(void)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	state = acpi_os_acquire_object(acpi_gbl_state_cache);
+	if (state) {
+
+		/* Initialize */
+		state->common.descriptor_type = ACPI_DESC_TYPE_STATE;
+	}
+
+	return (state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_create_thread_state
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      New Thread State. NULL on failure
+ *
+ * DESCRIPTION: Create a "Thread State" - a flavor of the generic state used
+ *              to track per-thread info during method execution
+ *
+ ******************************************************************************/
+
+struct acpi_thread_state *acpi_ut_create_thread_state(void)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Create the generic state object */
+
+	state = acpi_ut_create_generic_state();
+	if (!state) {
+		return (NULL);
+	}
+
+	/* Init fields specific to the update struct */
+
+	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_THREAD;
+	state->thread.thread_id = acpi_os_get_thread_id();
+
+	/* Check for invalid thread ID - zero is very bad, it will break things */
+
+	if (!state->thread.thread_id) {
+		ACPI_ERROR((AE_INFO, "Invalid zero ID from AcpiOsGetThreadId"));
+		state->thread.thread_id = (acpi_thread_id) 1;
+	}
+
+	return ((struct acpi_thread_state *)state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_create_update_state
+ *
+ * PARAMETERS:  object          - Initial Object to be installed in the state
+ *              action          - Update action to be performed
+ *
+ * RETURN:      New state object, null on failure
+ *
+ * DESCRIPTION: Create an "Update State" - a flavor of the generic state used
+ *              to update reference counts and delete complex objects such
+ *              as packages.
+ *
+ ******************************************************************************/
+
+union acpi_generic_state *acpi_ut_create_update_state(union acpi_operand_object
+						      *object, u16 action)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Create the generic state object */
+
+	state = acpi_ut_create_generic_state();
+	if (!state) {
+		return (NULL);
+	}
+
+	/* Init fields specific to the update struct */
+
+	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_UPDATE;
+	state->update.object = object;
+	state->update.value = action;
+	return (state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_create_pkg_state
+ *
+ * PARAMETERS:  object          - Initial Object to be installed in the state
+ *              action          - Update action to be performed
+ *
+ * RETURN:      New state object, null on failure
+ *
+ * DESCRIPTION: Create a "Package State"
+ *
+ ******************************************************************************/
+
+union acpi_generic_state *acpi_ut_create_pkg_state(void *internal_object,
+						   void *external_object,
+						   u32 index)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Create the generic state object */
+
+	state = acpi_ut_create_generic_state();
+	if (!state) {
+		return (NULL);
+	}
+
+	/* Init fields specific to the update struct */
+
+	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_PACKAGE;
+	state->pkg.source_object = (union acpi_operand_object *)internal_object;
+	state->pkg.dest_object = external_object;
+	state->pkg.index = index;
+	state->pkg.num_packages = 1;
+
+	return (state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_create_control_state
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      New state object, null on failure
+ *
+ * DESCRIPTION: Create a "Control State" - a flavor of the generic state used
+ *              to support nested IF/WHILE constructs in the AML.
+ *
+ ******************************************************************************/
+
+union acpi_generic_state *acpi_ut_create_control_state(void)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/* Create the generic state object */
+
+	state = acpi_ut_create_generic_state();
+	if (!state) {
+		return (NULL);
+	}
+
+	/* Init fields specific to the control struct */
+
+	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_CONTROL;
+	state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING;
+
+	return (state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_delete_generic_state
+ *
+ * PARAMETERS:  state               - The state object to be deleted
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Release a state object to the state cache. NULL state objects
+ *              are ignored.
+ *
+ ******************************************************************************/
+
+void acpi_ut_delete_generic_state(union acpi_generic_state *state)
+{
+	ACPI_FUNCTION_ENTRY();
+
+	/* Ignore null state */
+
+	if (state) {
+		(void)acpi_os_release_object(acpi_gbl_state_cache, state);
+	}
+
+	return;
+}