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diff --git a/drivers/acpi/executer/exoparg3.c b/drivers/acpi/executer/exoparg3.c
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1
2/******************************************************************************
3 *
4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2008, Intel Corp.
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 walk_state->result_obj = NULL;
264 }
265
266 /* Set the return object and exit */
267
268 else {
269 walk_state->result_obj = return_desc;
270 }
271 return_ACPI_STATUS(status);
272}
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