1 2/****************************************************************************** 3 * 4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments 5 * 6 *****************************************************************************/ 7 8/* 9 * Copyright (C) 2000 - 2007, R. Byron Moore 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45#include <acpi/acpi.h> 46#include <acpi/acinterp.h> 47#include <acpi/acparser.h> 48#include <acpi/amlcode.h> 49 50#define _COMPONENT ACPI_EXECUTER 51ACPI_MODULE_NAME("exoparg3") 52 53/*! 54 * Naming convention for AML interpreter execution routines. 55 * 56 * The routines that begin execution of AML opcodes are named with a common 57 * convention based upon the number of arguments, the number of target operands, 58 * and whether or not a value is returned: 59 * 60 * AcpiExOpcode_xA_yT_zR 61 * 62 * Where: 63 * 64 * xA - ARGUMENTS: The number of arguments (input operands) that are 65 * required for this opcode type (1 through 6 args). 66 * yT - TARGETS: The number of targets (output operands) that are required 67 * for this opcode type (0, 1, or 2 targets). 68 * zR - RETURN VALUE: Indicates whether this opcode type returns a value 69 * as the function return (0 or 1). 70 * 71 * The AcpiExOpcode* functions are called via the Dispatcher component with 72 * fully resolved operands. 73!*/ 74/******************************************************************************* 75 * 76 * FUNCTION: acpi_ex_opcode_3A_0T_0R 77 * 78 * PARAMETERS: walk_state - Current walk state 79 * 80 * RETURN: Status 81 * 82 * DESCRIPTION: Execute Triadic operator (3 operands) 83 * 84 ******************************************************************************/ 85acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state) 86{ 87 union acpi_operand_object **operand = &walk_state->operands[0]; 88 struct acpi_signal_fatal_info *fatal; 89 acpi_status status = AE_OK; 90 91 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R, 92 acpi_ps_get_opcode_name(walk_state->opcode)); 93 94 switch (walk_state->opcode) { 95 case AML_FATAL_OP: /* Fatal (fatal_type fatal_code fatal_arg) */ 96 97 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 98 "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n", 99 (u32) operand[0]->integer.value, 100 (u32) operand[1]->integer.value, 101 (u32) operand[2]->integer.value)); 102 103 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info)); 104 if (fatal) { 105 fatal->type = (u32) operand[0]->integer.value; 106 fatal->code = (u32) operand[1]->integer.value; 107 fatal->argument = (u32) operand[2]->integer.value; 108 } 109 110 /* Always signal the OS! */ 111 112 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal); 113 114 /* Might return while OS is shutting down, just continue */ 115 116 ACPI_FREE(fatal); 117 break; 118 119 default: 120 121 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X", 122 walk_state->opcode)); 123 status = AE_AML_BAD_OPCODE; 124 goto cleanup; 125 } 126 127 cleanup: 128 129 return_ACPI_STATUS(status); 130} 131 132/******************************************************************************* 133 * 134 * FUNCTION: acpi_ex_opcode_3A_1T_1R 135 * 136 * PARAMETERS: walk_state - Current walk state 137 * 138 * RETURN: Status 139 * 140 * DESCRIPTION: Execute Triadic operator (3 operands) 141 * 142 ******************************************************************************/ 143 144acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state) 145{ 146 union acpi_operand_object **operand = &walk_state->operands[0]; 147 union acpi_operand_object *return_desc = NULL; 148 char *buffer = NULL; 149 acpi_status status = AE_OK; 150 acpi_integer index; 151 acpi_size length; 152 153 ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R, 154 acpi_ps_get_opcode_name(walk_state->opcode)); 155 156 switch (walk_state->opcode) { 157 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */ 158 159 /* 160 * Create the return object. The Source operand is guaranteed to be 161 * either a String or a Buffer, so just use its type. 162 */ 163 return_desc = 164 acpi_ut_create_internal_object(ACPI_GET_OBJECT_TYPE 165 (operand[0])); 166 if (!return_desc) { 167 status = AE_NO_MEMORY; 168 goto cleanup; 169 } 170 171 /* Get the Integer values from the objects */ 172 173 index = operand[1]->integer.value; 174 length = (acpi_size) operand[2]->integer.value; 175 176 /* 177 * If the index is beyond the length of the String/Buffer, or if the 178 * requested length is zero, return a zero-length String/Buffer 179 */ 180 if (index >= operand[0]->string.length) { 181 length = 0; 182 } 183 184 /* Truncate request if larger than the actual String/Buffer */ 185 186 else if ((index + length) > operand[0]->string.length) { 187 length = (acpi_size) operand[0]->string.length - 188 (acpi_size) index; 189 } 190 191 /* Strings always have a sub-pointer, not so for buffers */ 192 193 switch (ACPI_GET_OBJECT_TYPE(operand[0])) { 194 case ACPI_TYPE_STRING: 195 196 /* Always allocate a new buffer for the String */ 197 198 buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1); 199 if (!buffer) { 200 status = AE_NO_MEMORY; 201 goto cleanup; 202 } 203 break; 204 205 case ACPI_TYPE_BUFFER: 206 207 /* If the requested length is zero, don't allocate a buffer */ 208 209 if (length > 0) { 210 211 /* Allocate a new buffer for the Buffer */ 212 213 buffer = ACPI_ALLOCATE_ZEROED(length); 214 if (!buffer) { 215 status = AE_NO_MEMORY; 216 goto cleanup; 217 } 218 } 219 break; 220 221 default: /* Should not happen */ 222 223 status = AE_AML_OPERAND_TYPE; 224 goto cleanup; 225 } 226 227 if (buffer) { 228 229 /* We have a buffer, copy the portion requested */ 230 231 ACPI_MEMCPY(buffer, operand[0]->string.pointer + index, 232 length); 233 } 234 235 /* Set the length of the new String/Buffer */ 236 237 return_desc->string.pointer = buffer; 238 return_desc->string.length = (u32) length; 239 240 /* Mark buffer initialized */ 241 242 return_desc->buffer.flags |= AOPOBJ_DATA_VALID; 243 break; 244 245 default: 246 247 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X", 248 walk_state->opcode)); 249 status = AE_AML_BAD_OPCODE; 250 goto cleanup; 251 } 252 253 /* Store the result in the target */ 254 255 status = acpi_ex_store(return_desc, operand[3], walk_state); 256 257 cleanup: 258 259 /* Delete return object on error */ 260 261 if (ACPI_FAILURE(status) || walk_state->result_obj) { 262 acpi_ut_remove_reference(return_desc); 263 } 264 265 /* Set the return object and exit */ 266 267 else { 268 walk_state->result_obj = return_desc; 269 } 270 return_ACPI_STATUS(status); 271} 272