1
2/******************************************************************************
3 *
4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5 * $Revision: 9 $
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999 - 2002, Intel Corp.
14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88
89 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
90 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * PARTICULAR PURPOSE.
92 *
93 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
94 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
95 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
96 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
97 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
98 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
99 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * LIMITED REMEDY.
101 *
102 * 4.3. Licensee shall not export, either directly or indirectly, any of this
103 * software or system incorporating such software without first obtaining any
104 * required license or other approval from the U. S. Department of Commerce or
105 * any other agency or department of the United States Government. In the
106 * event Licensee exports any such software from the United States or
107 * re-exports any such software from a foreign destination, Licensee shall
108 * ensure that the distribution and export/re-export of the software is in
109 * compliance with all laws, regulations, orders, or other restrictions of the
110 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
111 * any of its subsidiaries will export/re-export any technical data, process,
112 * software, or service, directly or indirectly, to any country for which the
113 * United States government or any agency thereof requires an export license,
114 * other governmental approval, or letter of assurance, without first obtaining
115 * such license, approval or letter.
116 *
117 *****************************************************************************/
118
119#define __EXOPARG3_C__
120
121#include "acpi.h"
122#include "acinterp.h"
123#include "acparser.h"
124#include "amlcode.h"
125
126
127#define _COMPONENT ACPI_EXECUTER
128 ACPI_MODULE_NAME ("exoparg3")
129
130
131/*!
132 * Naming convention for AML interpreter execution routines.
133 *
134 * The routines that begin execution of AML opcodes are named with a common
135 * convention based upon the number of arguments, the number of target operands,
136 * and whether or not a value is returned:
137 *
138 * AcpiExOpcode_xA_yT_zR
139 *
140 * Where:
141 *
142 * xA - ARGUMENTS: The number of arguments (input operands) that are
143 * required for this opcode type (1 through 6 args).
144 * yT - TARGETS: The number of targets (output operands) that are required
145 * for this opcode type (0, 1, or 2 targets).
146 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
147 * as the function return (0 or 1).
148 *
149 * The AcpiExOpcode* functions are called via the Dispatcher component with
150 * fully resolved operands.
151!*/
152
153
154/*******************************************************************************
155 *
156 * FUNCTION: AcpiExOpcode_3A_0T_0R
157 *
158 * PARAMETERS: WalkState - Current walk state
159 *
160 * RETURN: Status
161 *
162 * DESCRIPTION: Execute Triadic operator (3 operands)
163 *
164 ******************************************************************************/
165
166ACPI_STATUS
167AcpiExOpcode_3A_0T_0R (
168 ACPI_WALK_STATE *WalkState)
169{
170 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
171 ACPI_SIGNAL_FATAL_INFO *Fatal;
172 ACPI_STATUS Status = AE_OK;
173
174
175 ACPI_FUNCTION_TRACE_STR ("ExOpcode_3A_0T_0R", AcpiPsGetOpcodeName (WalkState->Opcode));
176
177
178 switch (WalkState->Opcode)
179 {
180
181 case AML_FATAL_OP: /* Fatal (FatalType FatalCode FatalArg) */
182
183 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
184 "FatalOp: Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
185 (UINT32) Operand[0]->Integer.Value, (UINT32) Operand[1]->Integer.Value,
186 (UINT32) Operand[2]->Integer.Value));
187
188
189 Fatal = ACPI_MEM_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO));
190 if (Fatal)
191 {
192 Fatal->Type = (UINT32) Operand[0]->Integer.Value;
193 Fatal->Code = (UINT32) Operand[1]->Integer.Value;
194 Fatal->Argument = (UINT32) Operand[2]->Integer.Value;
195 }
196
197 /*
198 * Always signal the OS!
199 */
200 AcpiOsSignal (ACPI_SIGNAL_FATAL, Fatal);
201
202 /* Might return while OS is shutting down, just continue */
203
204 ACPI_MEM_FREE (Fatal);
205 break;
206
207
208 default:
209
210 ACPI_REPORT_ERROR (("AcpiExOpcode_3A_0T_0R: Unknown opcode %X\n",
211 WalkState->Opcode));
212 Status = AE_AML_BAD_OPCODE;
213 goto Cleanup;
214 }
215
216
217Cleanup:
218
219 return_ACPI_STATUS (Status);
220}
221
222
223/*******************************************************************************
224 *
225 * FUNCTION: AcpiExOpcode_3A_1T_1R
226 *
227 * PARAMETERS: WalkState - Current walk state
228 *
229 * RETURN: Status
230 *
231 * DESCRIPTION: Execute Triadic operator (3 operands)
232 *
233 ******************************************************************************/
234
235ACPI_STATUS
236AcpiExOpcode_3A_1T_1R (
237 ACPI_WALK_STATE *WalkState)
238{
239 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
240 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
241 char *Buffer;
242 ACPI_STATUS Status = AE_OK;
243 UINT32 Index;
244 UINT32 Length;
245
246
247 ACPI_FUNCTION_TRACE_STR ("ExOpcode_3A_1T_1R", AcpiPsGetOpcodeName (WalkState->Opcode));
248
249
250 switch (WalkState->Opcode)
251 {
252 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
253
254 /*
255 * Create the return object. The Source operand is guaranteed to be
256 * either a String or a Buffer, so just use its type.
257 */
258 ReturnDesc = AcpiUtCreateInternalObject (Operand[0]->Common.Type);
259 if (!ReturnDesc)
260 {
261 Status = AE_NO_MEMORY;
262 goto Cleanup;
263 }
264
265 /* Get the Integer values from the objects */
266
267 Index = (UINT32) Operand[1]->Integer.Value;
268 Length = (UINT32) Operand[2]->Integer.Value;
269
270 /*
271 * If the index is beyond the length of the String/Buffer, or if the
272 * requested length is zero, return a zero-length String/Buffer
273 */
274 if ((Index < Operand[0]->String.Length) &&
275 (Length > 0))
276 {
277 /* Truncate request if larger than the actual String/Buffer */
278
279 if ((Index + Length) >
280 Operand[0]->String.Length)
281 {
282 Length = Operand[0]->String.Length - Index;
283 }
284
285 /* Allocate a new buffer for the String/Buffer */
286
287 Buffer = ACPI_MEM_CALLOCATE (Length + 1);
288 if (!Buffer)
289 {
290 Status = AE_NO_MEMORY;
291 goto Cleanup;
292 }
293
294 /* Copy the portion requested */
295
296 ACPI_MEMCPY (Buffer, Operand[0]->String.Pointer + Index,
297 Length);
298
299 /* Set the length of the new String/Buffer */
300
301 ReturnDesc->String.Pointer = Buffer;
302 ReturnDesc->String.Length = Length;
303 }
304 break;
305
306
307 default:
308
309 ACPI_REPORT_ERROR (("AcpiExOpcode_3A_0T_0R: Unknown opcode %X\n",
310 WalkState->Opcode));
311 Status = AE_AML_BAD_OPCODE;
312 goto Cleanup;
313 }
314
315 /* Store the result in the target */
316
317 Status = AcpiExStore (ReturnDesc, Operand[3], WalkState);
318
319Cleanup:
320
321 /* Delete return object on error */
322
323 if (ACPI_FAILURE (Status))
324 {
325 AcpiUtRemoveReference (ReturnDesc);
326 }
327
328 /* Set the return object and exit */
329
330 WalkState->ResultObj = ReturnDesc;
331 return_ACPI_STATUS (Status);
332}
333
334
2/******************************************************************************
3 *
4 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5 * $Revision: 9 $
6 *
7 *****************************************************************************/
8
9/******************************************************************************
10 *
11 * 1. Copyright Notice
12 *
13 * Some or all of this work - Copyright (c) 1999 - 2002, Intel Corp.
14 * All rights reserved.
15 *
16 * 2. License
17 *
18 * 2.1. This is your license from Intel Corp. under its intellectual property
19 * rights. You may have additional license terms from the party that provided
20 * you this software, covering your right to use that party's intellectual
21 * property rights.
22 *
23 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
24 * copy of the source code appearing in this file ("Covered Code") an
25 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
26 * base code distributed originally by Intel ("Original Intel Code") to copy,
27 * make derivatives, distribute, use and display any portion of the Covered
28 * Code in any form, with the right to sublicense such rights; and
29 *
30 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
31 * license (with the right to sublicense), under only those claims of Intel
32 * patents that are infringed by the Original Intel Code, to make, use, sell,
33 * offer to sell, and import the Covered Code and derivative works thereof
34 * solely to the minimum extent necessary to exercise the above copyright
35 * license, and in no event shall the patent license extend to any additions
36 * to or modifications of the Original Intel Code. No other license or right
37 * is granted directly or by implication, estoppel or otherwise;
38 *
39 * The above copyright and patent license is granted only if the following
40 * conditions are met:
41 *
42 * 3. Conditions
43 *
44 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
45 * Redistribution of source code of any substantial portion of the Covered
46 * Code or modification with rights to further distribute source must include
47 * the above Copyright Notice, the above License, this list of Conditions,
48 * and the following Disclaimer and Export Compliance provision. In addition,
49 * Licensee must cause all Covered Code to which Licensee contributes to
50 * contain a file documenting the changes Licensee made to create that Covered
51 * Code and the date of any change. Licensee must include in that file the
52 * documentation of any changes made by any predecessor Licensee. Licensee
53 * must include a prominent statement that the modification is derived,
54 * directly or indirectly, from Original Intel Code.
55 *
56 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
57 * Redistribution of source code of any substantial portion of the Covered
58 * Code or modification without rights to further distribute source must
59 * include the following Disclaimer and Export Compliance provision in the
60 * documentation and/or other materials provided with distribution. In
61 * addition, Licensee may not authorize further sublicense of source of any
62 * portion of the Covered Code, and must include terms to the effect that the
63 * license from Licensee to its licensee is limited to the intellectual
64 * property embodied in the software Licensee provides to its licensee, and
65 * not to intellectual property embodied in modifications its licensee may
66 * make.
67 *
68 * 3.3. Redistribution of Executable. Redistribution in executable form of any
69 * substantial portion of the Covered Code or modification must reproduce the
70 * above Copyright Notice, and the following Disclaimer and Export Compliance
71 * provision in the documentation and/or other materials provided with the
72 * distribution.
73 *
74 * 3.4. Intel retains all right, title, and interest in and to the Original
75 * Intel Code.
76 *
77 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
78 * Intel shall be used in advertising or otherwise to promote the sale, use or
79 * other dealings in products derived from or relating to the Covered Code
80 * without prior written authorization from Intel.
81 *
82 * 4. Disclaimer and Export Compliance
83 *
84 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
85 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
86 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
87 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
88
89 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
90 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
91 * PARTICULAR PURPOSE.
92 *
93 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
94 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
95 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
96 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
97 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
98 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
99 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
100 * LIMITED REMEDY.
101 *
102 * 4.3. Licensee shall not export, either directly or indirectly, any of this
103 * software or system incorporating such software without first obtaining any
104 * required license or other approval from the U. S. Department of Commerce or
105 * any other agency or department of the United States Government. In the
106 * event Licensee exports any such software from the United States or
107 * re-exports any such software from a foreign destination, Licensee shall
108 * ensure that the distribution and export/re-export of the software is in
109 * compliance with all laws, regulations, orders, or other restrictions of the
110 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
111 * any of its subsidiaries will export/re-export any technical data, process,
112 * software, or service, directly or indirectly, to any country for which the
113 * United States government or any agency thereof requires an export license,
114 * other governmental approval, or letter of assurance, without first obtaining
115 * such license, approval or letter.
116 *
117 *****************************************************************************/
118
119#define __EXOPARG3_C__
120
121#include "acpi.h"
122#include "acinterp.h"
123#include "acparser.h"
124#include "amlcode.h"
125
126
127#define _COMPONENT ACPI_EXECUTER
128 ACPI_MODULE_NAME ("exoparg3")
129
130
131/*!
132 * Naming convention for AML interpreter execution routines.
133 *
134 * The routines that begin execution of AML opcodes are named with a common
135 * convention based upon the number of arguments, the number of target operands,
136 * and whether or not a value is returned:
137 *
138 * AcpiExOpcode_xA_yT_zR
139 *
140 * Where:
141 *
142 * xA - ARGUMENTS: The number of arguments (input operands) that are
143 * required for this opcode type (1 through 6 args).
144 * yT - TARGETS: The number of targets (output operands) that are required
145 * for this opcode type (0, 1, or 2 targets).
146 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
147 * as the function return (0 or 1).
148 *
149 * The AcpiExOpcode* functions are called via the Dispatcher component with
150 * fully resolved operands.
151!*/
152
153
154/*******************************************************************************
155 *
156 * FUNCTION: AcpiExOpcode_3A_0T_0R
157 *
158 * PARAMETERS: WalkState - Current walk state
159 *
160 * RETURN: Status
161 *
162 * DESCRIPTION: Execute Triadic operator (3 operands)
163 *
164 ******************************************************************************/
165
166ACPI_STATUS
167AcpiExOpcode_3A_0T_0R (
168 ACPI_WALK_STATE *WalkState)
169{
170 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
171 ACPI_SIGNAL_FATAL_INFO *Fatal;
172 ACPI_STATUS Status = AE_OK;
173
174
175 ACPI_FUNCTION_TRACE_STR ("ExOpcode_3A_0T_0R", AcpiPsGetOpcodeName (WalkState->Opcode));
176
177
178 switch (WalkState->Opcode)
179 {
180
181 case AML_FATAL_OP: /* Fatal (FatalType FatalCode FatalArg) */
182
183 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
184 "FatalOp: Type %x Code %x Arg %x <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
185 (UINT32) Operand[0]->Integer.Value, (UINT32) Operand[1]->Integer.Value,
186 (UINT32) Operand[2]->Integer.Value));
187
188
189 Fatal = ACPI_MEM_ALLOCATE (sizeof (ACPI_SIGNAL_FATAL_INFO));
190 if (Fatal)
191 {
192 Fatal->Type = (UINT32) Operand[0]->Integer.Value;
193 Fatal->Code = (UINT32) Operand[1]->Integer.Value;
194 Fatal->Argument = (UINT32) Operand[2]->Integer.Value;
195 }
196
197 /*
198 * Always signal the OS!
199 */
200 AcpiOsSignal (ACPI_SIGNAL_FATAL, Fatal);
201
202 /* Might return while OS is shutting down, just continue */
203
204 ACPI_MEM_FREE (Fatal);
205 break;
206
207
208 default:
209
210 ACPI_REPORT_ERROR (("AcpiExOpcode_3A_0T_0R: Unknown opcode %X\n",
211 WalkState->Opcode));
212 Status = AE_AML_BAD_OPCODE;
213 goto Cleanup;
214 }
215
216
217Cleanup:
218
219 return_ACPI_STATUS (Status);
220}
221
222
223/*******************************************************************************
224 *
225 * FUNCTION: AcpiExOpcode_3A_1T_1R
226 *
227 * PARAMETERS: WalkState - Current walk state
228 *
229 * RETURN: Status
230 *
231 * DESCRIPTION: Execute Triadic operator (3 operands)
232 *
233 ******************************************************************************/
234
235ACPI_STATUS
236AcpiExOpcode_3A_1T_1R (
237 ACPI_WALK_STATE *WalkState)
238{
239 ACPI_OPERAND_OBJECT **Operand = &WalkState->Operands[0];
240 ACPI_OPERAND_OBJECT *ReturnDesc = NULL;
241 char *Buffer;
242 ACPI_STATUS Status = AE_OK;
243 UINT32 Index;
244 UINT32 Length;
245
246
247 ACPI_FUNCTION_TRACE_STR ("ExOpcode_3A_1T_1R", AcpiPsGetOpcodeName (WalkState->Opcode));
248
249
250 switch (WalkState->Opcode)
251 {
252 case AML_MID_OP: /* Mid (Source[0], Index[1], Length[2], Result[3]) */
253
254 /*
255 * Create the return object. The Source operand is guaranteed to be
256 * either a String or a Buffer, so just use its type.
257 */
258 ReturnDesc = AcpiUtCreateInternalObject (Operand[0]->Common.Type);
259 if (!ReturnDesc)
260 {
261 Status = AE_NO_MEMORY;
262 goto Cleanup;
263 }
264
265 /* Get the Integer values from the objects */
266
267 Index = (UINT32) Operand[1]->Integer.Value;
268 Length = (UINT32) Operand[2]->Integer.Value;
269
270 /*
271 * If the index is beyond the length of the String/Buffer, or if the
272 * requested length is zero, return a zero-length String/Buffer
273 */
274 if ((Index < Operand[0]->String.Length) &&
275 (Length > 0))
276 {
277 /* Truncate request if larger than the actual String/Buffer */
278
279 if ((Index + Length) >
280 Operand[0]->String.Length)
281 {
282 Length = Operand[0]->String.Length - Index;
283 }
284
285 /* Allocate a new buffer for the String/Buffer */
286
287 Buffer = ACPI_MEM_CALLOCATE (Length + 1);
288 if (!Buffer)
289 {
290 Status = AE_NO_MEMORY;
291 goto Cleanup;
292 }
293
294 /* Copy the portion requested */
295
296 ACPI_MEMCPY (Buffer, Operand[0]->String.Pointer + Index,
297 Length);
298
299 /* Set the length of the new String/Buffer */
300
301 ReturnDesc->String.Pointer = Buffer;
302 ReturnDesc->String.Length = Length;
303 }
304 break;
305
306
307 default:
308
309 ACPI_REPORT_ERROR (("AcpiExOpcode_3A_0T_0R: Unknown opcode %X\n",
310 WalkState->Opcode));
311 Status = AE_AML_BAD_OPCODE;
312 goto Cleanup;
313 }
314
315 /* Store the result in the target */
316
317 Status = AcpiExStore (ReturnDesc, Operand[3], WalkState);
318
319Cleanup:
320
321 /* Delete return object on error */
322
323 if (ACPI_FAILURE (Status))
324 {
325 AcpiUtRemoveReference (ReturnDesc);
326 }
327
328 /* Set the return object and exit */
329
330 WalkState->ResultObj = ReturnDesc;
331 return_ACPI_STATUS (Status);
332}
333
334