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/******************************************************************************
*
* Module Name: dswexec - Dispatcher method execution callbacks;
* dispatch to interpreter.
* $Revision: 79 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acdebug.h"
#define _COMPONENT ACPI_DISPATCHER
MODULE_NAME ("dswexec")
/*
* Dispatch tables for opcode classes
*/
ACPI_EXECUTE_OP acpi_gbl_op_type_dispatch [] = {
acpi_ex_opcode_1A_0T_0R,
acpi_ex_opcode_1A_0T_1R,
acpi_ex_opcode_1A_1T_0R,
acpi_ex_opcode_1A_1T_1R,
acpi_ex_opcode_2A_0T_0R,
acpi_ex_opcode_2A_0T_1R,
acpi_ex_opcode_2A_1T_1R,
acpi_ex_opcode_2A_2T_1R,
acpi_ex_opcode_3A_0T_0R,
acpi_ex_opcode_3A_1T_1R,
acpi_ex_opcode_6A_0T_1R};
/*****************************************************************************
*
* FUNCTION: Acpi_ds_get_predicate_value
*
* PARAMETERS: Walk_state - Current state of the parse tree walk
*
* RETURN: Status
*
* DESCRIPTION: Get the result of a predicate evaluation
*
****************************************************************************/
acpi_status
acpi_ds_get_predicate_value (
acpi_walk_state *walk_state,
u32 has_result_obj) {
acpi_status status = AE_OK;
acpi_operand_object *obj_desc;
FUNCTION_TRACE_PTR ("Ds_get_predicate_value", walk_state);
walk_state->control_state->common.state = 0;
if (has_result_obj) {
status = acpi_ds_result_pop (&obj_desc, walk_state);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Could not get result from predicate evaluation, %s\n",
acpi_format_exception (status)));
return_ACPI_STATUS (status);
}
}
else {
status = acpi_ds_create_operand (walk_state, walk_state->op, 0);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ex_resolve_to_value (&walk_state->operands [0], walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
obj_desc = walk_state->operands [0];
}
if (!obj_desc) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No predicate Obj_desc=%p State=%p\n",
obj_desc, walk_state));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
/*
* Result of predicate evaluation currently must
* be a number
*/
if (obj_desc->common.type != ACPI_TYPE_INTEGER) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Bad predicate (not a number) Obj_desc=%p State=%p Type=%X\n",
obj_desc, walk_state, obj_desc->common.type));
status = AE_AML_OPERAND_TYPE;
goto cleanup;
}
/* Truncate the predicate to 32-bits if necessary */
acpi_ex_truncate_for32bit_table (obj_desc, walk_state);
/*
* Save the result of the predicate evaluation on
* the control stack
*/
if (obj_desc->integer.value) {
walk_state->control_state->common.value = TRUE;
}
else {
/*
* Predicate is FALSE, we will just toss the
* rest of the package
*/
walk_state->control_state->common.value = FALSE;
status = AE_CTRL_FALSE;
}
cleanup:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Completed a predicate eval=%X Op=%pn",
walk_state->control_state->common.value, walk_state->op));
/* Break to debugger to display result */
DEBUGGER_EXEC (acpi_db_display_result_object (obj_desc, walk_state));
/*
* Delete the predicate result object (we know that
* we don't need it anymore)
*/
acpi_ut_remove_reference (obj_desc);
walk_state->control_state->common.state = CONTROL_NORMAL;
return_ACPI_STATUS (status);
}
/*****************************************************************************
*
* FUNCTION: Acpi_ds_exec_begin_op
*
* PARAMETERS: Walk_state - Current state of the parse tree walk
* Out_op - Return op if a new one is created
*
* RETURN: Status
*
* DESCRIPTION: Descending callback used during the execution of control
* methods. This is where most operators and operands are
* dispatched to the interpreter.
*
****************************************************************************/
acpi_status
acpi_ds_exec_begin_op (
acpi_walk_state *walk_state,
acpi_parse_object **out_op)
{
acpi_parse_object *op;
acpi_status status = AE_OK;
u32 opcode_class;
FUNCTION_TRACE_PTR ("Ds_exec_begin_op", walk_state);
op = walk_state->op;
if (!op) {
status = acpi_ds_load2_begin_op (walk_state, out_op);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
op = *out_op;
walk_state->op = op;
walk_state->op_info = acpi_ps_get_opcode_info (op->opcode);
walk_state->opcode = op->opcode;
}
if (op == walk_state->origin) {
if (out_op) {
*out_op = op;
}
return_ACPI_STATUS (AE_OK);
}
/*
* If the previous opcode was a conditional, this opcode
* must be the beginning of the associated predicate.
* Save this knowledge in the current scope descriptor
*/
if ((walk_state->control_state) &&
(walk_state->control_state->common.state ==
CONTROL_CONDITIONAL_EXECUTING)) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Exec predicate Op=%p State=%p\n",
op, walk_state));
walk_state->control_state->common.state = CONTROL_PREDICATE_EXECUTING;
/* Save start of predicate */
walk_state->control_state->control.predicate_op = op;
}
opcode_class = walk_state->op_info->class;
/* We want to send namepaths to the load code */
if (op->opcode == AML_INT_NAMEPATH_OP) {
opcode_class = AML_CLASS_NAMED_OBJECT;
}
/*
* Handle the opcode based upon the opcode type
*/
switch (opcode_class) {
case AML_CLASS_CONTROL:
status = acpi_ds_result_stack_push (walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
status = acpi_ds_exec_begin_control_op (walk_state, op);
break;
case AML_CLASS_NAMED_OBJECT:
if (walk_state->walk_type == WALK_METHOD) {
/*
* Found a named object declaration during method
* execution; we must enter this object into the
* namespace. The created object is temporary and
* will be deleted upon completion of the execution
* of this method.
*/
status = acpi_ds_load2_begin_op (walk_state, NULL);
}
if (op->opcode == AML_REGION_OP) {
status = acpi_ds_result_stack_push (walk_state);
}
break;
/* most operators with arguments */
case AML_CLASS_EXECUTE:
case AML_CLASS_CREATE:
/* Start a new result/operand state */
status = acpi_ds_result_stack_push (walk_state);
break;
default:
break;
}
/* Nothing to do here during method execution */
return_ACPI_STATUS (status);
}
/*****************************************************************************
*
* FUNCTION: Acpi_ds_exec_end_op
*
* PARAMETERS: Walk_state - Current state of the parse tree walk
* Op - Op that has been just been completed in the
* walk; Arguments have now been evaluated.
*
* RETURN: Status
*
* DESCRIPTION: Ascending callback used during the execution of control
* methods. The only thing we really need to do here is to
* notice the beginning of IF, ELSE, and WHILE blocks.
*
****************************************************************************/
acpi_status
acpi_ds_exec_end_op (
acpi_walk_state *walk_state)
{
acpi_parse_object *op;
acpi_status status = AE_OK;
u32 op_type;
u32 op_class;
acpi_parse_object *next_op;
acpi_parse_object *first_arg;
u32 i;
FUNCTION_TRACE_PTR ("Ds_exec_end_op", walk_state);
op = walk_state->op;
op_type = walk_state->op_info->type;
op_class = walk_state->op_info->class;
if (op_class == AML_CLASS_UNKNOWN) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown opcode %X\n", op->opcode));
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
}
first_arg = op->value.arg;
/* Init the walk state */
walk_state->num_operands = 0;
walk_state->return_desc = NULL;
walk_state->result_obj = NULL;
/* Call debugger for single step support (DEBUG build only) */
DEBUGGER_EXEC (status = acpi_db_single_step (walk_state, op, op_class));
DEBUGGER_EXEC (if (ACPI_FAILURE (status)) {return_ACPI_STATUS (status);});
switch (op_class) {
/* Decode the Opcode Class */
case AML_CLASS_ARGUMENT: /* constants, literals, etc. do nothing */
break;
/* most operators with arguments */
case AML_CLASS_EXECUTE:
/* Build resolved operand stack */
status = acpi_ds_create_operands (walk_state, first_arg);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/* Done with this result state (Now that operand stack is built) */
status = acpi_ds_result_stack_pop (walk_state);
if (ACPI_FAILURE (status)) {
goto cleanup;
}
/* Resolve all operands */
status = acpi_ex_resolve_operands (walk_state->opcode,
&(walk_state->operands [walk_state->num_operands -1]),
walk_state);
if (ACPI_FAILURE (status)) {
/* TBD: must pop and delete operands */
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "[%s]: Could not resolve operands, %s\n",
acpi_ps_get_opcode_name (walk_state->opcode), acpi_format_exception (status)));
/*
* On error, we must delete all the operands and clear the
* operand stack
*/
for (i = 0; i < walk_state->num_operands; i++) {
acpi_ut_remove_reference (walk_state->operands[i]);
walk_state->operands[i] = NULL;
}
walk_state->num_operands = 0;
goto cleanup;
}
DUMP_OPERANDS (WALK_OPERANDS, IMODE_EXECUTE, acpi_ps_get_opcode_name (walk_state->opcode),
walk_state->num_operands, "after Ex_resolve_operands");
/*
* Dispatch the request to the appropriate interpreter handler
* routine. There is one routine per opcode "type" based upon the
* number of opcode arguments and return type.
*/
status = acpi_gbl_op_type_dispatch [op_type] (walk_state);
/* Delete argument objects and clear the operand stack */
for (i = 0; i < walk_state->num_operands; i++) {
/*
* Remove a reference to all operands, including both
* "Arguments" and "Targets".
*/
acpi_ut_remove_reference (walk_state->operands[i]);
walk_state->operands[i] = NULL;
}
walk_state->num_operands = 0;
/*
* If a result object was returned from above, push it on the
* current result stack
*/
if (ACPI_SUCCESS (status) &&
walk_state->result_obj) {
status = acpi_ds_result_push (walk_state->result_obj, walk_state);
}
break;
default:
switch (op_type) {
case AML_TYPE_CONTROL: /* Type 1 opcode, IF/ELSE/WHILE/NOOP */
/* 1 Operand, 0 External_result, 0 Internal_result */
status = acpi_ds_exec_end_control_op (walk_state, op);
acpi_ds_result_stack_pop (walk_state);
break;
case AML_TYPE_METHOD_CALL:
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Method invocation, Op=%p\n", op));
/*
* (AML_METHODCALL) Op->Value->Arg->Node contains
* the method Node pointer
*/
/* Next_op points to the op that holds the method name */
next_op = first_arg;
/* Next_op points to first argument op */
next_op = next_op->next;
/*
* Get the method's arguments and put them on the operand stack
*/
status = acpi_ds_create_operands (walk_state, next_op);
if (ACPI_FAILURE (status)) {
break;
}
/*
* Since the operands will be passed to another
* control method, we must resolve all local
* references here (Local variables, arguments
* to *this* method, etc.)
*/
status = acpi_ds_resolve_operands (walk_state);
if (ACPI_FAILURE (status)) {
break;
}
/*
* Tell the walk loop to preempt this running method and
* execute the new method
*/
status = AE_CTRL_TRANSFER;
/*
* Return now; we don't want to disturb anything,
* especially the operand count!
*/
return_ACPI_STATUS (status);
break;
case AML_TYPE_CREATE_FIELD:
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing Create_field Buffer/Index Op=%p\n", op));
status = acpi_ds_load2_end_op (walk_state);
if (ACPI_FAILURE (status)) {
break;
}
status = acpi_ds_eval_buffer_field_operands (walk_state, op);
break;
case AML_TYPE_NAMED_FIELD:
case AML_TYPE_NAMED_COMPLEX:
case AML_TYPE_NAMED_SIMPLE:
status = acpi_ds_load2_end_op (walk_state);
if (ACPI_FAILURE (status)) {
break;
}
if (op->opcode == AML_REGION_OP) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"Executing Op_region Address/Length Op=%p\n", op));
status = acpi_ds_eval_region_operands (walk_state, op);
if (ACPI_FAILURE (status)) {
break;
}
status = acpi_ds_result_stack_pop (walk_state);
}
break;
case AML_TYPE_UNDEFINED:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Undefined opcode type Op=%p\n", op));
return_ACPI_STATUS (AE_NOT_IMPLEMENTED);
break;
case AML_TYPE_BOGUS:
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Internal opcode=%X type Op=%p\n",
walk_state->opcode, op));
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unimplemented opcode, class=%X type=%X Opcode=%X Op=%p\n",
op_class, op_type, op->opcode, op));
status = AE_NOT_IMPLEMENTED;
break;
}
}
/*
* ACPI 2.0 support for 64-bit integers:
* Truncate numeric result value if we are executing from a 32-bit ACPI table
*/
acpi_ex_truncate_for32bit_table (walk_state->result_obj, walk_state);
/*
* Check if we just completed the evaluation of a
* conditional predicate
*/
if ((walk_state->control_state) &&
(walk_state->control_state->common.state ==
CONTROL_PREDICATE_EXECUTING) &&
(walk_state->control_state->control.predicate_op == op)) {
status = acpi_ds_get_predicate_value (walk_state, (u32) walk_state->result_obj);
walk_state->result_obj = NULL;
}
cleanup:
if (walk_state->result_obj) {
/* Break to debugger to display result */
DEBUGGER_EXEC (acpi_db_display_result_object (walk_state->result_obj, walk_state));
/*
* Delete the result op if and only if:
* Parent will not use the result -- such as any
* non-nested type2 op in a method (parent will be method)
*/
acpi_ds_delete_result_if_not_used (op, walk_state->result_obj, walk_state);
}
/* Always clear the object stack */
/* TBD: [Investigate] Clear stack of return value,
but don't delete it */
walk_state->num_operands = 0;
return_ACPI_STATUS (status);
}
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