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Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/acpica/utstate.c | 275 |
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 000000000..a2484556a --- /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; +} |