--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: dswstate - Dispatcher parse tree walk management routines
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * 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>
+#include "accommon.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_DISPATCHER
+ACPI_MODULE_NAME("dswstate")
+
+ /* Local prototypes */
+static acpi_status
+acpi_ds_result_stack_push(struct acpi_walk_state *walk_state);
+static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_result_pop
+ *
+ * PARAMETERS: object - Where to return the popped object
+ * walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Pop an object off the top of this walk's result stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_result_pop(union acpi_operand_object **object,
+ struct acpi_walk_state *walk_state)
+{
+ u32 index;
+ union acpi_generic_state *state;
+ acpi_status status;
+
+ ACPI_FUNCTION_NAME(ds_result_pop);
+
+ state = walk_state->results;
+
+ /* Incorrect state of result stack */
+
+ if (state && !walk_state->result_count) {
+ ACPI_ERROR((AE_INFO, "No results on result stack"));
+ return (AE_AML_INTERNAL);
+ }
+
+ if (!state && walk_state->result_count) {
+ ACPI_ERROR((AE_INFO, "No result state for result stack"));
+ return (AE_AML_INTERNAL);
+ }
+
+ /* Empty result stack */
+
+ if (!state) {
+ ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
+ walk_state));
+ return (AE_AML_NO_RETURN_VALUE);
+ }
+
+ /* Return object of the top element and clean that top element result stack */
+
+ walk_state->result_count--;
+ index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+
+ *object = state->results.obj_desc[index];
+ if (!*object) {
+ ACPI_ERROR((AE_INFO,
+ "No result objects on result stack, State=%p",
+ walk_state));
+ return (AE_AML_NO_RETURN_VALUE);
+ }
+
+ state->results.obj_desc[index] = NULL;
+ if (index == 0) {
+ status = acpi_ds_result_stack_pop(walk_state);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
+ acpi_ut_get_object_type_name(*object),
+ index, walk_state, walk_state->result_count));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_result_push
+ *
+ * PARAMETERS: object - Where to return the popped object
+ * walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Push an object onto the current result stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_result_push(union acpi_operand_object * object,
+ struct acpi_walk_state * walk_state)
+{
+ union acpi_generic_state *state;
+ acpi_status status;
+ u32 index;
+
+ ACPI_FUNCTION_NAME(ds_result_push);
+
+ if (walk_state->result_count > walk_state->result_size) {
+ ACPI_ERROR((AE_INFO, "Result stack is full"));
+ return (AE_AML_INTERNAL);
+ } else if (walk_state->result_count == walk_state->result_size) {
+
+ /* Extend the result stack */
+
+ status = acpi_ds_result_stack_push(walk_state);
+ if (ACPI_FAILURE(status)) {
+ ACPI_ERROR((AE_INFO,
+ "Failed to extend the result stack"));
+ return (status);
+ }
+ }
+
+ if (!(walk_state->result_count < walk_state->result_size)) {
+ ACPI_ERROR((AE_INFO, "No free elements in result stack"));
+ return (AE_AML_INTERNAL);
+ }
+
+ state = walk_state->results;
+ if (!state) {
+ ACPI_ERROR((AE_INFO, "No result stack frame during push"));
+ return (AE_AML_INTERNAL);
+ }
+
+ if (!object) {
+ ACPI_ERROR((AE_INFO,
+ "Null Object! Obj=%p State=%p Num=%u",
+ object, walk_state, walk_state->result_count));
+ return (AE_BAD_PARAMETER);
+ }
+
+ /* Assign the address of object to the top free element of result stack */
+
+ index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+ state->results.obj_desc[index] = object;
+ walk_state->result_count++;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
+ object,
+ acpi_ut_get_object_type_name((union
+ acpi_operand_object *)
+ object), walk_state,
+ walk_state->result_count,
+ walk_state->current_result));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_result_stack_push
+ *
+ * PARAMETERS: walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Push an object onto the walk_state result stack
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state)
+{
+ union acpi_generic_state *state;
+
+ ACPI_FUNCTION_NAME(ds_result_stack_push);
+
+ /* Check for stack overflow */
+
+ if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
+ ACPI_RESULTS_OBJ_NUM_MAX) {
+ ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u",
+ walk_state, walk_state->result_size));
+ return (AE_STACK_OVERFLOW);
+ }
+
+ state = acpi_ut_create_generic_state();
+ if (!state) {
+ return (AE_NO_MEMORY);
+ }
+
+ state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
+ acpi_ut_push_generic_state(&walk_state->results, state);
+
+ /* Increase the length of the result stack by the length of frame */
+
+ walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
+ state, walk_state));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_result_stack_pop
+ *
+ * PARAMETERS: walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Pop an object off of the walk_state result stack
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state)
+{
+ union acpi_generic_state *state;
+
+ ACPI_FUNCTION_NAME(ds_result_stack_pop);
+
+ /* Check for stack underflow */
+
+ if (walk_state->results == NULL) {
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Result stack underflow - State=%p\n",
+ walk_state));
+ return (AE_AML_NO_OPERAND);
+ }
+
+ if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
+ ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
+ return (AE_AML_INTERNAL);
+ }
+
+ state = acpi_ut_pop_generic_state(&walk_state->results);
+ acpi_ut_delete_generic_state(state);
+
+ /* Decrease the length of result stack by the length of frame */
+
+ walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Result=%p RemainingResults=%X State=%p\n",
+ state, walk_state->result_count, walk_state));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_obj_stack_push
+ *
+ * PARAMETERS: object - Object to push
+ * walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Push an object onto this walk's object/operand stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_obj_stack_push(void *object, struct acpi_walk_state * walk_state)
+{
+ ACPI_FUNCTION_NAME(ds_obj_stack_push);
+
+ /* Check for stack overflow */
+
+ if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
+ ACPI_ERROR((AE_INFO,
+ "Object stack overflow! Obj=%p State=%p #Ops=%u",
+ object, walk_state, walk_state->num_operands));
+ return (AE_STACK_OVERFLOW);
+ }
+
+ /* Put the object onto the stack */
+
+ walk_state->operands[walk_state->operand_index] = object;
+ walk_state->num_operands++;
+
+ /* For the usual order of filling the operand stack */
+
+ walk_state->operand_index++;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
+ object,
+ acpi_ut_get_object_type_name((union
+ acpi_operand_object *)
+ object), walk_state,
+ walk_state->num_operands));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_obj_stack_pop
+ *
+ * PARAMETERS: pop_count - Number of objects/entries to pop
+ * walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
+ * deleted by this routine.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state * walk_state)
+{
+ u32 i;
+
+ ACPI_FUNCTION_NAME(ds_obj_stack_pop);
+
+ for (i = 0; i < pop_count; i++) {
+
+ /* Check for stack underflow */
+
+ if (walk_state->num_operands == 0) {
+ ACPI_ERROR((AE_INFO,
+ "Object stack underflow! Count=%X State=%p #Ops=%u",
+ pop_count, walk_state,
+ walk_state->num_operands));
+ return (AE_STACK_UNDERFLOW);
+ }
+
+ /* Just set the stack entry to null */
+
+ walk_state->num_operands--;
+ walk_state->operands[walk_state->num_operands] = NULL;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
+ pop_count, walk_state, walk_state->num_operands));
+
+ return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_obj_stack_pop_and_delete
+ *
+ * PARAMETERS: pop_count - Number of objects/entries to pop
+ * walk_state - Current Walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Pop this walk's object stack and delete each object that is
+ * popped off.
+ *
+ ******************************************************************************/
+
+void
+acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
+ struct acpi_walk_state *walk_state)
+{
+ s32 i;
+ union acpi_operand_object *obj_desc;
+
+ ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
+
+ if (pop_count == 0) {
+ return;
+ }
+
+ for (i = (s32) pop_count - 1; i >= 0; i--) {
+ if (walk_state->num_operands == 0) {
+ return;
+ }
+
+ /* Pop the stack and delete an object if present in this stack entry */
+
+ walk_state->num_operands--;
+ obj_desc = walk_state->operands[i];
+ if (obj_desc) {
+ acpi_ut_remove_reference(walk_state->operands[i]);
+ walk_state->operands[i] = NULL;
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
+ pop_count, walk_state, walk_state->num_operands));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_get_current_walk_state
+ *
+ * PARAMETERS: thread - Get current active state for this Thread
+ *
+ * RETURN: Pointer to the current walk state
+ *
+ * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
+ * walk state.)
+ *
+ ******************************************************************************/
+
+struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
+ *thread)
+{
+ ACPI_FUNCTION_NAME(ds_get_current_walk_state);
+
+ if (!thread) {
+ return (NULL);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n",
+ thread->walk_state_list));
+
+ return (thread->walk_state_list);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ds_push_walk_state
+ *
+ * PARAMETERS: walk_state - State to push
+ * thread - Thread state object
+ *
+ * RETURN: None
+ *
+ * DESCRIPTION: Place the Thread state at the head of the state list
+ *
+ ******************************************************************************/
+
+void
+acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
+ struct acpi_thread_state *thread)
+{
+ ACPI_FUNCTION_TRACE(ds_push_walk_state);
+
+ walk_state->next = thread->walk_state_list;
+ thread->walk_state_list = walk_state;
+
+ return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff