724 lines
19 KiB
C
724 lines
19 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: dswstate - Dispatcher parse tree walk management routines
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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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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#include "acparser.h"
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#include "acdispat.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME("dswstate")
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/* Local prototypes */
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static acpi_status
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acpi_ds_result_stack_push(struct acpi_walk_state *walk_state);
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static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_result_pop
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*
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* PARAMETERS: object - Where to return the popped object
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* walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Pop an object off the top of this walk's result stack
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*
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******************************************************************************/
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acpi_status
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acpi_ds_result_pop(union acpi_operand_object **object,
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struct acpi_walk_state *walk_state)
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{
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u32 index;
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union acpi_generic_state *state;
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acpi_status status;
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ACPI_FUNCTION_NAME(ds_result_pop);
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state = walk_state->results;
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/* Incorrect state of result stack */
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if (state && !walk_state->result_count) {
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ACPI_ERROR((AE_INFO, "No results on result stack"));
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return (AE_AML_INTERNAL);
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}
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if (!state && walk_state->result_count) {
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ACPI_ERROR((AE_INFO, "No result state for result stack"));
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return (AE_AML_INTERNAL);
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}
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/* Empty result stack */
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if (!state) {
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ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
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walk_state));
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return (AE_AML_NO_RETURN_VALUE);
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}
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/* Return object of the top element and clean that top element result stack */
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walk_state->result_count--;
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index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
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*object = state->results.obj_desc[index];
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if (!*object) {
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ACPI_ERROR((AE_INFO,
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"No result objects on result stack, State=%p",
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walk_state));
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return (AE_AML_NO_RETURN_VALUE);
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}
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state->results.obj_desc[index] = NULL;
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if (index == 0) {
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status = acpi_ds_result_stack_pop(walk_state);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
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acpi_ut_get_object_type_name(*object),
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index, walk_state, walk_state->result_count));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_result_push
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*
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* PARAMETERS: object - Where to return the popped object
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* walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Push an object onto the current result stack
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*
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******************************************************************************/
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acpi_status
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acpi_ds_result_push(union acpi_operand_object *object,
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struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *state;
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acpi_status status;
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u32 index;
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ACPI_FUNCTION_NAME(ds_result_push);
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if (walk_state->result_count > walk_state->result_size) {
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ACPI_ERROR((AE_INFO, "Result stack is full"));
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return (AE_AML_INTERNAL);
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} else if (walk_state->result_count == walk_state->result_size) {
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/* Extend the result stack */
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status = acpi_ds_result_stack_push(walk_state);
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if (ACPI_FAILURE(status)) {
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ACPI_ERROR((AE_INFO,
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"Failed to extend the result stack"));
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return (status);
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}
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}
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if (!(walk_state->result_count < walk_state->result_size)) {
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ACPI_ERROR((AE_INFO, "No free elements in result stack"));
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return (AE_AML_INTERNAL);
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}
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state = walk_state->results;
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if (!state) {
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ACPI_ERROR((AE_INFO, "No result stack frame during push"));
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return (AE_AML_INTERNAL);
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}
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if (!object) {
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ACPI_ERROR((AE_INFO,
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"Null Object! Obj=%p State=%p Num=%u",
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object, walk_state, walk_state->result_count));
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return (AE_BAD_PARAMETER);
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}
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/* Assign the address of object to the top free element of result stack */
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index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
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state->results.obj_desc[index] = object;
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walk_state->result_count++;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
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object,
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acpi_ut_get_object_type_name((union
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acpi_operand_object *)
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object), walk_state,
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walk_state->result_count,
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walk_state->current_result));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_result_stack_push
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*
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* PARAMETERS: walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Push an object onto the walk_state result stack
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*
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******************************************************************************/
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static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_NAME(ds_result_stack_push);
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/* Check for stack overflow */
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if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
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ACPI_RESULTS_OBJ_NUM_MAX) {
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ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u",
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walk_state, walk_state->result_size));
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return (AE_STACK_OVERFLOW);
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}
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state = acpi_ut_create_generic_state();
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if (!state) {
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return (AE_NO_MEMORY);
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}
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state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
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acpi_ut_push_generic_state(&walk_state->results, state);
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/* Increase the length of the result stack by the length of frame */
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walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
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state, walk_state));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_result_stack_pop
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*
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* PARAMETERS: walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Pop an object off of the walk_state result stack
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*
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******************************************************************************/
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static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state)
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{
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union acpi_generic_state *state;
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ACPI_FUNCTION_NAME(ds_result_stack_pop);
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/* Check for stack underflow */
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if (walk_state->results == NULL) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Result stack underflow - State=%p\n",
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walk_state));
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return (AE_AML_NO_OPERAND);
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}
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if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
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ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
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return (AE_AML_INTERNAL);
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}
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state = acpi_ut_pop_generic_state(&walk_state->results);
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acpi_ut_delete_generic_state(state);
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/* Decrease the length of result stack by the length of frame */
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walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Result=%p RemainingResults=%X State=%p\n",
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state, walk_state->result_count, walk_state));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_obj_stack_push
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*
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* PARAMETERS: object - Object to push
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* walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Push an object onto this walk's object/operand stack
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*
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******************************************************************************/
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acpi_status
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acpi_ds_obj_stack_push(void *object, struct acpi_walk_state *walk_state)
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{
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ACPI_FUNCTION_NAME(ds_obj_stack_push);
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/* Check for stack overflow */
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if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
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ACPI_ERROR((AE_INFO,
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"Object stack overflow! Obj=%p State=%p #Ops=%u",
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object, walk_state, walk_state->num_operands));
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return (AE_STACK_OVERFLOW);
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}
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/* Put the object onto the stack */
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walk_state->operands[walk_state->operand_index] = object;
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walk_state->num_operands++;
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/* For the usual order of filling the operand stack */
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walk_state->operand_index++;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
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object,
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acpi_ut_get_object_type_name((union
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acpi_operand_object *)
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object), walk_state,
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walk_state->num_operands));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_obj_stack_pop
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*
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* PARAMETERS: pop_count - Number of objects/entries to pop
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* walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
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* deleted by this routine.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state *walk_state)
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{
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u32 i;
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ACPI_FUNCTION_NAME(ds_obj_stack_pop);
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for (i = 0; i < pop_count; i++) {
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/* Check for stack underflow */
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if (walk_state->num_operands == 0) {
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ACPI_ERROR((AE_INFO,
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"Object stack underflow! Count=%X State=%p #Ops=%u",
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pop_count, walk_state,
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walk_state->num_operands));
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return (AE_STACK_UNDERFLOW);
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}
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/* Just set the stack entry to null */
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walk_state->num_operands--;
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walk_state->operands[walk_state->num_operands] = NULL;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
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pop_count, walk_state, walk_state->num_operands));
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_obj_stack_pop_and_delete
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*
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* PARAMETERS: pop_count - Number of objects/entries to pop
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* walk_state - Current Walk state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Pop this walk's object stack and delete each object that is
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* popped off.
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*
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******************************************************************************/
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void
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acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
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struct acpi_walk_state *walk_state)
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{
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s32 i;
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union acpi_operand_object *obj_desc;
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ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
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if (pop_count == 0) {
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return;
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}
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for (i = (s32)pop_count - 1; i >= 0; i--) {
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if (walk_state->num_operands == 0) {
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return;
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}
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/* Pop the stack and delete an object if present in this stack entry */
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walk_state->num_operands--;
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obj_desc = walk_state->operands[i];
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if (obj_desc) {
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acpi_ut_remove_reference(walk_state->operands[i]);
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walk_state->operands[i] = NULL;
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
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pop_count, walk_state, walk_state->num_operands));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_get_current_walk_state
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*
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||
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* PARAMETERS: thread - Get current active state for this Thread
|
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*
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* RETURN: Pointer to the current walk state
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*
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||
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* DESCRIPTION: Get the walk state that is at the head of the list (the "current"
|
||
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* walk state.)
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||
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*
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******************************************************************************/
|
||
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|
||
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struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
|
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*thread)
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{
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ACPI_FUNCTION_NAME(ds_get_current_walk_state);
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if (!thread) {
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return (NULL);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n",
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thread->walk_state_list));
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||
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return (thread->walk_state_list);
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}
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|
||
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/*******************************************************************************
|
||
|
*
|
||
|
* FUNCTION: acpi_ds_push_walk_state
|
||
|
*
|
||
|
* PARAMETERS: walk_state - State to push
|
||
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* thread - Thread state object
|
||
|
*
|
||
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* RETURN: None
|
||
|
*
|
||
|
* DESCRIPTION: Place the Thread state at the head of the state list
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
void
|
||
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acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
|
||
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struct acpi_thread_state *thread)
|
||
|
{
|
||
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ACPI_FUNCTION_TRACE(ds_push_walk_state);
|
||
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|
||
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walk_state->next = thread->walk_state_list;
|
||
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thread->walk_state_list = walk_state;
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||
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|
||
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return_VOID;
|
||
|
}
|
||
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|
||
|
/*******************************************************************************
|
||
|
*
|
||
|
* FUNCTION: acpi_ds_pop_walk_state
|
||
|
*
|
||
|
* PARAMETERS: thread - Current thread state
|
||
|
*
|
||
|
* RETURN: A walk_state object popped from the thread's stack
|
||
|
*
|
||
|
* DESCRIPTION: Remove and return the walkstate object that is at the head of
|
||
|
* the walk stack for the given walk list. NULL indicates that
|
||
|
* the list is empty.
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread)
|
||
|
{
|
||
|
struct acpi_walk_state *walk_state;
|
||
|
|
||
|
ACPI_FUNCTION_TRACE(ds_pop_walk_state);
|
||
|
|
||
|
walk_state = thread->walk_state_list;
|
||
|
|
||
|
if (walk_state) {
|
||
|
|
||
|
/* Next walk state becomes the current walk state */
|
||
|
|
||
|
thread->walk_state_list = walk_state->next;
|
||
|
|
||
|
/*
|
||
|
* Don't clear the NEXT field, this serves as an indicator
|
||
|
* that there is a parent WALK STATE
|
||
|
* Do Not: walk_state->Next = NULL;
|
||
|
*/
|
||
|
}
|
||
|
|
||
|
return_PTR(walk_state);
|
||
|
}
|
||
|
|
||
|
/*******************************************************************************
|
||
|
*
|
||
|
* FUNCTION: acpi_ds_create_walk_state
|
||
|
*
|
||
|
* PARAMETERS: owner_id - ID for object creation
|
||
|
* origin - Starting point for this walk
|
||
|
* method_desc - Method object
|
||
|
* thread - Current thread state
|
||
|
*
|
||
|
* RETURN: Pointer to the new walk state.
|
||
|
*
|
||
|
* DESCRIPTION: Allocate and initialize a new walk state. The current walk
|
||
|
* state is set to this new state.
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id,
|
||
|
union acpi_parse_object
|
||
|
*origin,
|
||
|
union acpi_operand_object
|
||
|
*method_desc,
|
||
|
struct acpi_thread_state
|
||
|
*thread)
|
||
|
{
|
||
|
struct acpi_walk_state *walk_state;
|
||
|
|
||
|
ACPI_FUNCTION_TRACE(ds_create_walk_state);
|
||
|
|
||
|
walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state));
|
||
|
if (!walk_state) {
|
||
|
return_PTR(NULL);
|
||
|
}
|
||
|
|
||
|
walk_state->descriptor_type = ACPI_DESC_TYPE_WALK;
|
||
|
walk_state->method_desc = method_desc;
|
||
|
walk_state->owner_id = owner_id;
|
||
|
walk_state->origin = origin;
|
||
|
walk_state->thread = thread;
|
||
|
|
||
|
walk_state->parser_state.start_op = origin;
|
||
|
|
||
|
/* Init the method args/local */
|
||
|
|
||
|
#if (!defined (ACPI_NO_METHOD_EXECUTION) && !defined (ACPI_CONSTANT_EVAL_ONLY))
|
||
|
acpi_ds_method_data_init(walk_state);
|
||
|
#endif
|
||
|
|
||
|
/* Put the new state at the head of the walk list */
|
||
|
|
||
|
if (thread) {
|
||
|
acpi_ds_push_walk_state(walk_state, thread);
|
||
|
}
|
||
|
|
||
|
return_PTR(walk_state);
|
||
|
}
|
||
|
|
||
|
/*******************************************************************************
|
||
|
*
|
||
|
* FUNCTION: acpi_ds_init_aml_walk
|
||
|
*
|
||
|
* PARAMETERS: walk_state - New state to be initialized
|
||
|
* op - Current parse op
|
||
|
* method_node - Control method NS node, if any
|
||
|
* aml_start - Start of AML
|
||
|
* aml_length - Length of AML
|
||
|
* info - Method info block (params, etc.)
|
||
|
* pass_number - 1, 2, or 3
|
||
|
*
|
||
|
* RETURN: Status
|
||
|
*
|
||
|
* DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
acpi_status
|
||
|
acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state,
|
||
|
union acpi_parse_object *op,
|
||
|
struct acpi_namespace_node *method_node,
|
||
|
u8 * aml_start,
|
||
|
u32 aml_length,
|
||
|
struct acpi_evaluate_info *info, u8 pass_number)
|
||
|
{
|
||
|
acpi_status status;
|
||
|
struct acpi_parse_state *parser_state = &walk_state->parser_state;
|
||
|
union acpi_parse_object *extra_op;
|
||
|
|
||
|
ACPI_FUNCTION_TRACE(ds_init_aml_walk);
|
||
|
|
||
|
walk_state->parser_state.aml =
|
||
|
walk_state->parser_state.aml_start = aml_start;
|
||
|
walk_state->parser_state.aml_end =
|
||
|
walk_state->parser_state.pkg_end = aml_start + aml_length;
|
||
|
|
||
|
/* The next_op of the next_walk will be the beginning of the method */
|
||
|
|
||
|
walk_state->next_op = NULL;
|
||
|
walk_state->pass_number = pass_number;
|
||
|
|
||
|
if (info) {
|
||
|
walk_state->params = info->parameters;
|
||
|
walk_state->caller_return_desc = &info->return_object;
|
||
|
}
|
||
|
|
||
|
status = acpi_ps_init_scope(&walk_state->parser_state, op);
|
||
|
if (ACPI_FAILURE(status)) {
|
||
|
return_ACPI_STATUS(status);
|
||
|
}
|
||
|
|
||
|
if (method_node) {
|
||
|
walk_state->parser_state.start_node = method_node;
|
||
|
walk_state->walk_type = ACPI_WALK_METHOD;
|
||
|
walk_state->method_node = method_node;
|
||
|
walk_state->method_desc =
|
||
|
acpi_ns_get_attached_object(method_node);
|
||
|
|
||
|
/* Push start scope on scope stack and make it current */
|
||
|
|
||
|
status =
|
||
|
acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD,
|
||
|
walk_state);
|
||
|
if (ACPI_FAILURE(status)) {
|
||
|
return_ACPI_STATUS(status);
|
||
|
}
|
||
|
|
||
|
/* Init the method arguments */
|
||
|
|
||
|
status = acpi_ds_method_data_init_args(walk_state->params,
|
||
|
ACPI_METHOD_NUM_ARGS,
|
||
|
walk_state);
|
||
|
if (ACPI_FAILURE(status)) {
|
||
|
return_ACPI_STATUS(status);
|
||
|
}
|
||
|
} else {
|
||
|
/*
|
||
|
* Setup the current scope.
|
||
|
* Find a Named Op that has a namespace node associated with it.
|
||
|
* search upwards from this Op. Current scope is the first
|
||
|
* Op with a namespace node.
|
||
|
*/
|
||
|
extra_op = parser_state->start_op;
|
||
|
while (extra_op && !extra_op->common.node) {
|
||
|
extra_op = extra_op->common.parent;
|
||
|
}
|
||
|
|
||
|
if (!extra_op) {
|
||
|
parser_state->start_node = NULL;
|
||
|
} else {
|
||
|
parser_state->start_node = extra_op->common.node;
|
||
|
}
|
||
|
|
||
|
if (parser_state->start_node) {
|
||
|
|
||
|
/* Push start scope on scope stack and make it current */
|
||
|
|
||
|
status =
|
||
|
acpi_ds_scope_stack_push(parser_state->start_node,
|
||
|
parser_state->start_node->
|
||
|
type, walk_state);
|
||
|
if (ACPI_FAILURE(status)) {
|
||
|
return_ACPI_STATUS(status);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
status = acpi_ds_init_callbacks(walk_state, pass_number);
|
||
|
return_ACPI_STATUS(status);
|
||
|
}
|
||
|
|
||
|
/*******************************************************************************
|
||
|
*
|
||
|
* FUNCTION: acpi_ds_delete_walk_state
|
||
|
*
|
||
|
* PARAMETERS: walk_state - State to delete
|
||
|
*
|
||
|
* RETURN: Status
|
||
|
*
|
||
|
* DESCRIPTION: Delete a walk state including all internal data structures
|
||
|
*
|
||
|
******************************************************************************/
|
||
|
|
||
|
void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
|
||
|
{
|
||
|
union acpi_generic_state *state;
|
||
|
|
||
|
ACPI_FUNCTION_TRACE_PTR(ds_delete_walk_state, walk_state);
|
||
|
|
||
|
if (!walk_state) {
|
||
|
return_VOID;
|
||
|
}
|
||
|
|
||
|
if (walk_state->descriptor_type != ACPI_DESC_TYPE_WALK) {
|
||
|
ACPI_ERROR((AE_INFO, "%p is not a valid walk state",
|
||
|
walk_state));
|
||
|
return_VOID;
|
||
|
}
|
||
|
|
||
|
/* There should not be any open scopes */
|
||
|
|
||
|
if (walk_state->parser_state.scope) {
|
||
|
ACPI_ERROR((AE_INFO, "%p walk still has a scope list",
|
||
|
walk_state));
|
||
|
acpi_ps_cleanup_scope(&walk_state->parser_state);
|
||
|
}
|
||
|
|
||
|
/* Always must free any linked control states */
|
||
|
|
||
|
while (walk_state->control_state) {
|
||
|
state = walk_state->control_state;
|
||
|
walk_state->control_state = state->common.next;
|
||
|
|
||
|
acpi_ut_delete_generic_state(state);
|
||
|
}
|
||
|
|
||
|
/* Always must free any linked parse states */
|
||
|
|
||
|
while (walk_state->scope_info) {
|
||
|
state = walk_state->scope_info;
|
||
|
walk_state->scope_info = state->common.next;
|
||
|
|
||
|
acpi_ut_delete_generic_state(state);
|
||
|
}
|
||
|
|
||
|
/* Always must free any stacked result states */
|
||
|
|
||
|
while (walk_state->results) {
|
||
|
state = walk_state->results;
|
||
|
walk_state->results = state->common.next;
|
||
|
|
||
|
acpi_ut_delete_generic_state(state);
|
||
|
}
|
||
|
|
||
|
ACPI_FREE(walk_state);
|
||
|
return_VOID;
|
||
|
}
|