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