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Diffstat (limited to 'drivers/acpi/utilities/utstate.c')
| -rw-r--r-- | drivers/acpi/utilities/utstate.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/drivers/acpi/utilities/utstate.c b/drivers/acpi/utilities/utstate.c new file mode 100644 index 000000000000..c1cb27583be8 --- /dev/null +++ b/drivers/acpi/utilities/utstate.c @@ -0,0 +1,333 @@ +/******************************************************************************* + * + * Module Name: utstate - state object support procedures + * + ******************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, R. Byron Moore + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include <acpi/acpi.h> + +#define _COMPONENT ACPI_UTILITIES +ACPI_MODULE_NAME("utstate") + +/******************************************************************************* + * + * FUNCTION: acpi_ut_create_pkg_state_and_push + * + * PARAMETERS: Object - Object to be added to the new state + * Action - Increment/Decrement + * state_list - List the state will be added to + * + * RETURN: Status + * + * DESCRIPTION: Create a new state and push it + * + ******************************************************************************/ +acpi_status +acpi_ut_create_pkg_state_and_push(void *internal_object, + void *external_object, + u16 index, + union acpi_generic_state ** state_list) +{ + union acpi_generic_state *state; + + ACPI_FUNCTION_ENTRY(); + + state = + acpi_ut_create_pkg_state(internal_object, external_object, index); + if (!state) { + return (AE_NO_MEMORY); + } + + acpi_ut_push_generic_state(state_list, state); + return (AE_OK); +} + +/******************************************************************************* + * + * 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_TRACE("ut_push_generic_state"); + + /* Push the state object onto the front of the list (stack) */ + + state->common.next = *list_head; + *list_head = state; + + return_VOID; +} + +/******************************************************************************* + * + * 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_TRACE("ut_pop_generic_state"); + + /* 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_PTR(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 */ + memset(state, 0, sizeof(union acpi_generic_state)); + state->common.data_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_TRACE("ut_create_thread_state"); + + /* Create the generic state object */ + + state = acpi_ut_create_generic_state(); + if (!state) { + return_PTR(NULL); + } + + /* Init fields specific to the update struct */ + + state->common.data_type = ACPI_DESC_TYPE_STATE_THREAD; + state->thread.thread_id = acpi_os_get_thread_id(); + + return_PTR((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_TRACE_PTR("ut_create_update_state", object); + + /* Create the generic state object */ + + state = acpi_ut_create_generic_state(); + if (!state) { + return_PTR(NULL); + } + + /* Init fields specific to the update struct */ + + state->common.data_type = ACPI_DESC_TYPE_STATE_UPDATE; + state->update.object = object; + state->update.value = action; + + return_PTR(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, + u16 index) +{ + union acpi_generic_state *state; + + ACPI_FUNCTION_TRACE_PTR("ut_create_pkg_state", internal_object); + + /* Create the generic state object */ + + state = acpi_ut_create_generic_state(); + if (!state) { + return_PTR(NULL); + } + + /* Init fields specific to the update struct */ + + state->common.data_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_PTR(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_TRACE("ut_create_control_state"); + + /* Create the generic state object */ + + state = acpi_ut_create_generic_state(); + if (!state) { + return_PTR(NULL); + } + + /* Init fields specific to the control struct */ + + state->common.data_type = ACPI_DESC_TYPE_STATE_CONTROL; + state->common.state = ACPI_CONTROL_CONDITIONAL_EXECUTING; + + return_PTR(state); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ut_delete_generic_state + * + * PARAMETERS: State - The state object to be deleted + * + * RETURN: None + * + * DESCRIPTION: Put a state object back into the global state cache. The object + * is not actually freed at this time. + * + ******************************************************************************/ + +void acpi_ut_delete_generic_state(union acpi_generic_state *state) +{ + ACPI_FUNCTION_TRACE("ut_delete_generic_state"); + + (void)acpi_os_release_object(acpi_gbl_state_cache, state); + return_VOID; +} |
