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714 lines
21 KiB
714 lines
21 KiB
/*******************************************************************************
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*
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* Module Name: dsmthdat - control method arguments and local variables
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acdispat.h>
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#include <acpi/amlcode.h>
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#include <acpi/acnamesp.h>
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#include <acpi/acinterp.h>
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#define _COMPONENT ACPI_DISPATCHER
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ACPI_MODULE_NAME("dsmthdat")
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/* Local prototypes */
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static void
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acpi_ds_method_data_delete_value(u16 opcode,
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u32 index, struct acpi_walk_state *walk_state);
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static acpi_status
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acpi_ds_method_data_set_value(u16 opcode,
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u32 index,
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union acpi_operand_object *object,
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struct acpi_walk_state *walk_state);
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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acpi_object_type
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acpi_ds_method_data_get_type(u16 opcode,
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u32 index, struct acpi_walk_state *walk_state);
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#endif
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_init
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*
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* PARAMETERS: walk_state - Current walk state object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize the data structures that hold the method's arguments
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* and locals. The data struct is an array of namespace nodes for
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* each - this allows ref_of and de_ref_of to work properly for these
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* special data types.
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*
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* NOTES: walk_state fields are initialized to zero by the
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* ACPI_MEM_CALLOCATE().
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*
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* A pseudo-Namespace Node is assigned to each argument and local
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* so that ref_of() can return a pointer to the Node.
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*
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******************************************************************************/
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void acpi_ds_method_data_init(struct acpi_walk_state *walk_state)
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{
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u32 i;
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ACPI_FUNCTION_TRACE("ds_method_data_init");
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/* Init the method arguments */
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for (i = 0; i < ACPI_METHOD_NUM_ARGS; i++) {
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ACPI_MOVE_32_TO_32(&walk_state->arguments[i].name,
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NAMEOF_ARG_NTE);
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walk_state->arguments[i].name.integer |= (i << 24);
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walk_state->arguments[i].descriptor = ACPI_DESC_TYPE_NAMED;
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walk_state->arguments[i].type = ACPI_TYPE_ANY;
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walk_state->arguments[i].flags = ANOBJ_END_OF_PEER_LIST |
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ANOBJ_METHOD_ARG;
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}
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/* Init the method locals */
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for (i = 0; i < ACPI_METHOD_NUM_LOCALS; i++) {
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ACPI_MOVE_32_TO_32(&walk_state->local_variables[i].name,
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NAMEOF_LOCAL_NTE);
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walk_state->local_variables[i].name.integer |= (i << 24);
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walk_state->local_variables[i].descriptor =
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ACPI_DESC_TYPE_NAMED;
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walk_state->local_variables[i].type = ACPI_TYPE_ANY;
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walk_state->local_variables[i].flags = ANOBJ_END_OF_PEER_LIST |
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ANOBJ_METHOD_LOCAL;
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_delete_all
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*
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* PARAMETERS: walk_state - Current walk state object
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete method locals and arguments. Arguments are only
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* deleted if this method was called from another method.
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*
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******************************************************************************/
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void acpi_ds_method_data_delete_all(struct acpi_walk_state *walk_state)
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{
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u32 index;
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ACPI_FUNCTION_TRACE("ds_method_data_delete_all");
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/* Detach the locals */
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for (index = 0; index < ACPI_METHOD_NUM_LOCALS; index++) {
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if (walk_state->local_variables[index].object) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Local%d=%p\n",
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index,
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walk_state->local_variables[index].
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object));
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/* Detach object (if present) and remove a reference */
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acpi_ns_detach_object(&walk_state->
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local_variables[index]);
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}
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}
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/* Detach the arguments */
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for (index = 0; index < ACPI_METHOD_NUM_ARGS; index++) {
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if (walk_state->arguments[index].object) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Deleting Arg%d=%p\n",
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index,
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walk_state->arguments[index].object));
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/* Detach object (if present) and remove a reference */
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acpi_ns_detach_object(&walk_state->arguments[index]);
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}
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_init_args
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*
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* PARAMETERS: *Params - Pointer to a parameter list for the method
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* max_param_count - The arg count for this method
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* walk_state - Current walk state object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize arguments for a method. The parameter list is a list
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* of ACPI operand objects, either null terminated or whose length
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* is defined by max_param_count.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_method_data_init_args(union acpi_operand_object **params,
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u32 max_param_count,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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u32 index = 0;
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ACPI_FUNCTION_TRACE_PTR("ds_method_data_init_args", params);
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if (!params) {
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"No param list passed to method\n"));
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return_ACPI_STATUS(AE_OK);
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}
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/* Copy passed parameters into the new method stack frame */
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while ((index < ACPI_METHOD_NUM_ARGS) &&
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(index < max_param_count) && params[index]) {
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/*
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* A valid parameter.
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* Store the argument in the method/walk descriptor.
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* Do not copy the arg in order to implement call by reference
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*/
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status = acpi_ds_method_data_set_value(AML_ARG_OP, index,
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params[index],
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walk_state);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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index++;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "%d args passed to method\n", index));
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_get_node
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*
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* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
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* Index - Which Local or Arg whose type to get
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* walk_state - Current walk state object
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* Node - Where the node is returned.
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*
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* RETURN: Status and node
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*
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* DESCRIPTION: Get the Node associated with a local or arg.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_method_data_get_node(u16 opcode,
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u32 index,
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struct acpi_walk_state *walk_state,
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struct acpi_namespace_node **node)
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{
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ACPI_FUNCTION_TRACE("ds_method_data_get_node");
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/*
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* Method Locals and Arguments are supported
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*/
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switch (opcode) {
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case AML_LOCAL_OP:
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if (index > ACPI_METHOD_MAX_LOCAL) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Local index %d is invalid (max %d)\n",
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index, ACPI_METHOD_MAX_LOCAL));
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return_ACPI_STATUS(AE_AML_INVALID_INDEX);
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}
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/* Return a pointer to the pseudo-node */
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*node = &walk_state->local_variables[index];
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break;
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case AML_ARG_OP:
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if (index > ACPI_METHOD_MAX_ARG) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Arg index %d is invalid (max %d)\n",
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index, ACPI_METHOD_MAX_ARG));
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return_ACPI_STATUS(AE_AML_INVALID_INDEX);
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}
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/* Return a pointer to the pseudo-node */
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*node = &walk_state->arguments[index];
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Opcode %d is invalid\n",
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opcode));
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return_ACPI_STATUS(AE_AML_BAD_OPCODE);
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_set_value
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*
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* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
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* Index - Which Local or Arg to get
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* Object - Object to be inserted into the stack entry
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* walk_state - Current walk state object
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*
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* RETURN: Status
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*
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* DESCRIPTION: Insert an object onto the method stack at entry Opcode:Index.
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* Note: There is no "implicit conversion" for locals.
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*
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******************************************************************************/
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static acpi_status
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acpi_ds_method_data_set_value(u16 opcode,
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u32 index,
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union acpi_operand_object *object,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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ACPI_FUNCTION_TRACE("ds_method_data_set_value");
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"new_obj %p Opcode %X, Refs=%d [%s]\n", object,
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opcode, object->common.reference_count,
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acpi_ut_get_type_name(object->common.type)));
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/* Get the namespace node for the arg/local */
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status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* Increment ref count so object can't be deleted while installed.
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* NOTE: We do not copy the object in order to preserve the call by
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* reference semantics of ACPI Control Method invocation.
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* (See ACPI specification 2.0_c)
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*/
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acpi_ut_add_reference(object);
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/* Install the object */
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node->object = object;
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_get_value
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*
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* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
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* Index - which local_var or argument to get
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* walk_state - Current walk state object
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* dest_desc - Where Arg or Local value is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Retrieve value of selected Arg or Local for this method
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* Used only in acpi_ex_resolve_to_value().
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*
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******************************************************************************/
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acpi_status
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acpi_ds_method_data_get_value(u16 opcode,
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u32 index,
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struct acpi_walk_state *walk_state,
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union acpi_operand_object **dest_desc)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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union acpi_operand_object *object;
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ACPI_FUNCTION_TRACE("ds_method_data_get_value");
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/* Validate the object descriptor */
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if (!dest_desc) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Null object descriptor pointer\n"));
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Get the namespace node for the arg/local */
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status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Get the object from the node */
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object = node->object;
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/* Examine the returned object, it must be valid. */
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if (!object) {
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/*
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* Index points to uninitialized object.
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* This means that either 1) The expected argument was
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* not passed to the method, or 2) A local variable
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* was referenced by the method (via the ASL)
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* before it was initialized. Either case is an error.
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*/
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/* If slack enabled, init the local_x/arg_x to an Integer of value zero */
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if (acpi_gbl_enable_interpreter_slack) {
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object =
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acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
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if (!object) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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object->integer.value = 0;
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node->object = object;
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}
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/* Otherwise, return the error */
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else
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switch (opcode) {
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case AML_ARG_OP:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Uninitialized Arg[%d] at node %p\n",
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index, node));
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return_ACPI_STATUS(AE_AML_UNINITIALIZED_ARG);
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case AML_LOCAL_OP:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Uninitialized Local[%d] at node %p\n",
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index, node));
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return_ACPI_STATUS(AE_AML_UNINITIALIZED_LOCAL);
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default:
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ACPI_REPORT_ERROR(("Not Arg/Local opcode: %X\n",
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opcode));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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}
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/*
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* The Index points to an initialized and valid object.
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* Return an additional reference to the object
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*/
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*dest_desc = object;
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acpi_ut_add_reference(object);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_method_data_delete_value
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*
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* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
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* Index - which local_var or argument to delete
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* walk_state - Current walk state object
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*
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* RETURN: None
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*
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* DESCRIPTION: Delete the entry at Opcode:Index. Inserts
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* a null into the stack slot after the object is deleted.
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*
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******************************************************************************/
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static void
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acpi_ds_method_data_delete_value(u16 opcode,
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u32 index, struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
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union acpi_operand_object *object;
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ACPI_FUNCTION_TRACE("ds_method_data_delete_value");
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/* Get the namespace node for the arg/local */
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status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
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if (ACPI_FAILURE(status)) {
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return_VOID;
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}
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/* Get the associated object */
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object = acpi_ns_get_attached_object(node);
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/*
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* Undefine the Arg or Local by setting its descriptor
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* pointer to NULL. Locals/Args can contain both
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* ACPI_OPERAND_OBJECTS and ACPI_NAMESPACE_NODEs
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*/
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node->object = NULL;
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if ((object) &&
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(ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_OPERAND)) {
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/*
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* There is a valid object.
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* Decrement the reference count by one to balance the
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* increment when the object was stored.
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*/
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acpi_ut_remove_reference(object);
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ds_store_object_to_local
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*
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* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
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* Index - Which Local or Arg to set
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* obj_desc - Value to be stored
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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: Store a value in an Arg or Local. The obj_desc is installed
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* as the new value for the Arg or Local and the reference count
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* for obj_desc is incremented.
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*
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******************************************************************************/
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acpi_status
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acpi_ds_store_object_to_local(u16 opcode,
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u32 index,
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union acpi_operand_object *obj_desc,
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struct acpi_walk_state *walk_state)
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{
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acpi_status status;
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struct acpi_namespace_node *node;
|
|
union acpi_operand_object *current_obj_desc;
|
|
union acpi_operand_object *new_obj_desc;
|
|
|
|
ACPI_FUNCTION_TRACE("ds_store_object_to_local");
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Opcode=%X Index=%d Obj=%p\n",
|
|
opcode, index, obj_desc));
|
|
|
|
/* Parameter validation */
|
|
|
|
if (!obj_desc) {
|
|
return_ACPI_STATUS(AE_BAD_PARAMETER);
|
|
}
|
|
|
|
/* Get the namespace node for the arg/local */
|
|
|
|
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
current_obj_desc = acpi_ns_get_attached_object(node);
|
|
if (current_obj_desc == obj_desc) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p already installed!\n",
|
|
obj_desc));
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/*
|
|
* If the reference count on the object is more than one, we must
|
|
* take a copy of the object before we store. A reference count
|
|
* of exactly 1 means that the object was just created during the
|
|
* evaluation of an expression, and we can safely use it since it
|
|
* is not used anywhere else.
|
|
*/
|
|
new_obj_desc = obj_desc;
|
|
if (obj_desc->common.reference_count > 1) {
|
|
status =
|
|
acpi_ut_copy_iobject_to_iobject(obj_desc, &new_obj_desc,
|
|
walk_state);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there is an object already in this slot, we either
|
|
* have to delete it, or if this is an argument and there
|
|
* is an object reference stored there, we have to do
|
|
* an indirect store!
|
|
*/
|
|
if (current_obj_desc) {
|
|
/*
|
|
* Check for an indirect store if an argument
|
|
* contains an object reference (stored as an Node).
|
|
* We don't allow this automatic dereferencing for
|
|
* locals, since a store to a local should overwrite
|
|
* anything there, including an object reference.
|
|
*
|
|
* If both Arg0 and Local0 contain ref_of (Local4):
|
|
*
|
|
* Store (1, Arg0) - Causes indirect store to local4
|
|
* Store (1, Local0) - Stores 1 in local0, overwriting
|
|
* the reference to local4
|
|
* Store (1, de_refof (Local0)) - Causes indirect store to local4
|
|
*
|
|
* Weird, but true.
|
|
*/
|
|
if (opcode == AML_ARG_OP) {
|
|
/*
|
|
* If we have a valid reference object that came from ref_of(),
|
|
* do the indirect store
|
|
*/
|
|
if ((ACPI_GET_DESCRIPTOR_TYPE(current_obj_desc) ==
|
|
ACPI_DESC_TYPE_OPERAND)
|
|
&& (current_obj_desc->common.type ==
|
|
ACPI_TYPE_LOCAL_REFERENCE)
|
|
&& (current_obj_desc->reference.opcode ==
|
|
AML_REF_OF_OP)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
|
|
"Arg (%p) is an obj_ref(Node), storing in node %p\n",
|
|
new_obj_desc,
|
|
current_obj_desc));
|
|
|
|
/*
|
|
* Store this object to the Node (perform the indirect store)
|
|
* NOTE: No implicit conversion is performed, as per the ACPI
|
|
* specification rules on storing to Locals/Args.
|
|
*/
|
|
status =
|
|
acpi_ex_store_object_to_node(new_obj_desc,
|
|
current_obj_desc->
|
|
reference.
|
|
object,
|
|
walk_state,
|
|
ACPI_NO_IMPLICIT_CONVERSION);
|
|
|
|
/* Remove local reference if we copied the object above */
|
|
|
|
if (new_obj_desc != obj_desc) {
|
|
acpi_ut_remove_reference(new_obj_desc);
|
|
}
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delete the existing object
|
|
* before storing the new one
|
|
*/
|
|
acpi_ds_method_data_delete_value(opcode, index, walk_state);
|
|
}
|
|
|
|
/*
|
|
* Install the Obj descriptor (*new_obj_desc) into
|
|
* the descriptor for the Arg or Local.
|
|
* (increments the object reference count by one)
|
|
*/
|
|
status =
|
|
acpi_ds_method_data_set_value(opcode, index, new_obj_desc,
|
|
walk_state);
|
|
|
|
/* Remove local reference if we copied the object above */
|
|
|
|
if (new_obj_desc != obj_desc) {
|
|
acpi_ut_remove_reference(new_obj_desc);
|
|
}
|
|
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
#ifdef ACPI_OBSOLETE_FUNCTIONS
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ds_method_data_get_type
|
|
*
|
|
* PARAMETERS: Opcode - Either AML_LOCAL_OP or AML_ARG_OP
|
|
* Index - Which Local or Arg whose type to get
|
|
* walk_state - Current walk state object
|
|
*
|
|
* RETURN: Data type of current value of the selected Arg or Local
|
|
*
|
|
* DESCRIPTION: Get the type of the object stored in the Local or Arg
|
|
*
|
|
******************************************************************************/
|
|
|
|
acpi_object_type
|
|
acpi_ds_method_data_get_type(u16 opcode,
|
|
u32 index, struct acpi_walk_state *walk_state)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_namespace_node *node;
|
|
union acpi_operand_object *object;
|
|
|
|
ACPI_FUNCTION_TRACE("ds_method_data_get_type");
|
|
|
|
/* Get the namespace node for the arg/local */
|
|
|
|
status = acpi_ds_method_data_get_node(opcode, index, walk_state, &node);
|
|
if (ACPI_FAILURE(status)) {
|
|
return_VALUE((ACPI_TYPE_NOT_FOUND));
|
|
}
|
|
|
|
/* Get the object */
|
|
|
|
object = acpi_ns_get_attached_object(node);
|
|
if (!object) {
|
|
/* Uninitialized local/arg, return TYPE_ANY */
|
|
|
|
return_VALUE(ACPI_TYPE_ANY);
|
|
}
|
|
|
|
/* Get the object type */
|
|
|
|
return_VALUE(ACPI_GET_OBJECT_TYPE(object));
|
|
}
|
|
#endif
|
|
|