exoparg3.c
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上传日期:2013-04-10
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文件大小:6k
- /******************************************************************************
- *
- * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
- * $Revision: 3 $
- *
- *****************************************************************************/
- /*
- * 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 "acinterp.h"
- #include "acparser.h"
- #include "amlcode.h"
- #define _COMPONENT ACPI_EXECUTER
- MODULE_NAME ("exoparg3")
- /*!
- * Naming convention for AML interpreter execution routines.
- *
- * The routines that begin execution of AML opcodes are named with a common
- * convention based upon the number of arguments, the number of target operands,
- * and whether or not a value is returned:
- *
- * AcpiExOpcode_xA_yT_zR
- *
- * Where:
- *
- * xA - ARGUMENTS: The number of arguments (input operands) that are
- * required for this opcode type (1 through 6 args).
- * yT - TARGETS: The number of targets (output operands) that are required
- * for this opcode type (0, 1, or 2 targets).
- * zR - RETURN VALUE: Indicates whether this opcode type returns a value
- * as the function return (0 or 1).
- *
- * The AcpiExOpcode* functions are called via the Dispatcher component with
- * fully resolved operands.
- !*/
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ex_opcode_3A_0T_0R
- *
- * PARAMETERS: Walk_state - Current walk state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Execute Triadic operator (3 operands)
- *
- ******************************************************************************/
- acpi_status
- acpi_ex_opcode_3A_0T_0R (
- acpi_walk_state *walk_state)
- {
- acpi_operand_object **operand = &walk_state->operands[0];
- ACPI_SIGNAL_FATAL_INFO *fatal;
- acpi_status status = AE_OK;
- FUNCTION_TRACE_STR ("Ex_opcode_3A_0T_0R", acpi_ps_get_opcode_name (walk_state->opcode));
- switch (walk_state->opcode) {
- case AML_FATAL_OP: /* Fatal (Fatal_type Fatal_code Fatal_arg) */
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
- "Fatal_op: Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<n",
- (u32) operand[0]->integer.value, (u32) operand[1]->integer.value,
- (u32) operand[2]->integer.value));
- fatal = ACPI_MEM_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO));
- if (fatal) {
- fatal->type = (u32) operand[0]->integer.value;
- fatal->code = (u32) operand[1]->integer.value;
- fatal->argument = (u32) operand[2]->integer.value;
- }
- /*
- * Always signal the OS!
- */
- acpi_os_signal (ACPI_SIGNAL_FATAL, fatal);
- /* Might return while OS is shutting down, just continue */
- ACPI_MEM_FREE (fatal);
- break;
- default:
- REPORT_ERROR (("Acpi_ex_opcode_3A_0T_0R: Unknown opcode %Xn",
- walk_state->opcode));
- status = AE_AML_BAD_OPCODE;
- goto cleanup;
- break;
- }
- cleanup:
- return_ACPI_STATUS (status);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ex_opcode_3A_1T_1R
- *
- * PARAMETERS: Walk_state - Current walk state
- *
- * RETURN: Status
- *
- * DESCRIPTION: Execute Triadic operator (3 operands)
- *
- ******************************************************************************/
- acpi_status
- acpi_ex_opcode_3A_1T_1R (
- acpi_walk_state *walk_state)
- {
- acpi_operand_object **operand = &walk_state->operands[0];
- acpi_operand_object *return_desc = NULL;
- char *buffer;
- acpi_status status = AE_OK;
- u32 index;
- u32 length;
- FUNCTION_TRACE_STR ("Ex_opcode_3A_1T_1R", acpi_ps_get_opcode_name (walk_state->opcode));
- switch (walk_state->opcode) {
- case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
- /*
- * Create the return object. The Source operand is guaranteed to be
- * either a String or a Buffer, so just use its type.
- */
- return_desc = acpi_ut_create_internal_object (operand[0]->common.type);
- if (!return_desc) {
- status = AE_NO_MEMORY;
- goto cleanup;
- }
- /* Get the Integer values from the objects */
- index = (u32) operand[1]->integer.value;
- length = (u32) operand[2]->integer.value;
- /*
- * If the index is beyond the length of the String/Buffer, or if the
- * requested length is zero, return a zero-length String/Buffer
- */
- if ((index < operand[0]->string.length) &&
- (length > 0)) {
- /* Truncate request if larger than the actual String/Buffer */
- if ((index + length) >
- operand[0]->string.length) {
- length = operand[0]->string.length - index;
- }
- /* Allocate a new buffer for the String/Buffer */
- buffer = ACPI_MEM_CALLOCATE (length + 1);
- if (!buffer) {
- return (AE_NO_MEMORY);
- }
- /* Copy the portion requested */
- MEMCPY (buffer, operand[0]->string.pointer + index,
- length);
- /* Set the length of the new String/Buffer */
- return_desc->string.pointer = buffer;
- return_desc->string.length = length;
- }
- break;
- default:
- REPORT_ERROR (("Acpi_ex_opcode_3A_0T_0R: Unknown opcode %Xn",
- walk_state->opcode));
- status = AE_AML_BAD_OPCODE;
- goto cleanup;
- break;
- }
- /* Store the result in the target */
- status = acpi_ex_store (return_desc, operand[3], walk_state);
- cleanup:
- /* Delete return object on error */
- if (ACPI_FAILURE (status)) {
- acpi_ut_remove_reference (return_desc);
- }
- /* Set the return object and exit */
- walk_state->result_obj = return_desc;
- return_ACPI_STATUS (status);
- }