Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / acpi / acpica / exoparg3.c
1
2 /******************************************************************************
3  *
4  * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2010, 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 "accommon.h"
47 #include "acinterp.h"
48 #include "acparser.h"
49 #include "amlcode.h"
50
51 #define _COMPONENT          ACPI_EXECUTER
52 ACPI_MODULE_NAME("exoparg3")
53
54 /*!
55  * Naming convention for AML interpreter execution routines.
56  *
57  * The routines that begin execution of AML opcodes are named with a common
58  * convention based upon the number of arguments, the number of target operands,
59  * and whether or not a value is returned:
60  *
61  *      AcpiExOpcode_xA_yT_zR
62  *
63  * Where:
64  *
65  * xA - ARGUMENTS:    The number of arguments (input operands) that are
66  *                    required for this opcode type (1 through 6 args).
67  * yT - TARGETS:      The number of targets (output operands) that are required
68  *                    for this opcode type (0, 1, or 2 targets).
69  * zR - RETURN VALUE: Indicates whether this opcode type returns a value
70  *                    as the function return (0 or 1).
71  *
72  * The AcpiExOpcode* functions are called via the Dispatcher component with
73  * fully resolved operands.
74 !*/
75 /*******************************************************************************
76  *
77  * FUNCTION:    acpi_ex_opcode_3A_0T_0R
78  *
79  * PARAMETERS:  walk_state          - Current walk state
80  *
81  * RETURN:      Status
82  *
83  * DESCRIPTION: Execute Triadic operator (3 operands)
84  *
85  ******************************************************************************/
86 acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)
87 {
88         union acpi_operand_object **operand = &walk_state->operands[0];
89         struct acpi_signal_fatal_info *fatal;
90         acpi_status status = AE_OK;
91
92         ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,
93                                 acpi_ps_get_opcode_name(walk_state->opcode));
94
95         switch (walk_state->opcode) {
96         case AML_FATAL_OP:      /* Fatal (fatal_type fatal_code fatal_arg) */
97
98                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
99                                   "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
100                                   (u32) operand[0]->integer.value,
101                                   (u32) operand[1]->integer.value,
102                                   (u32) operand[2]->integer.value));
103
104                 fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
105                 if (fatal) {
106                         fatal->type = (u32) operand[0]->integer.value;
107                         fatal->code = (u32) operand[1]->integer.value;
108                         fatal->argument = (u32) operand[2]->integer.value;
109                 }
110
111                 /* Always signal the OS! */
112
113                 status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);
114
115                 /* Might return while OS is shutting down, just continue */
116
117                 ACPI_FREE(fatal);
118                 break;
119
120         default:
121
122                 ACPI_ERROR((AE_INFO, "Unknown AML opcode %X",
123                             walk_state->opcode));
124                 status = AE_AML_BAD_OPCODE;
125                 goto cleanup;
126         }
127
128       cleanup:
129
130         return_ACPI_STATUS(status);
131 }
132
133 /*******************************************************************************
134  *
135  * FUNCTION:    acpi_ex_opcode_3A_1T_1R
136  *
137  * PARAMETERS:  walk_state          - Current walk state
138  *
139  * RETURN:      Status
140  *
141  * DESCRIPTION: Execute Triadic operator (3 operands)
142  *
143  ******************************************************************************/
144
145 acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)
146 {
147         union acpi_operand_object **operand = &walk_state->operands[0];
148         union acpi_operand_object *return_desc = NULL;
149         char *buffer = NULL;
150         acpi_status status = AE_OK;
151         u64 index;
152         acpi_size length;
153
154         ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,
155                                 acpi_ps_get_opcode_name(walk_state->opcode));
156
157         switch (walk_state->opcode) {
158         case AML_MID_OP:        /* Mid (Source[0], Index[1], Length[2], Result[3]) */
159
160                 /*
161                  * Create the return object.  The Source operand is guaranteed to be
162                  * either a String or a Buffer, so just use its type.
163                  */
164                 return_desc = acpi_ut_create_internal_object((operand[0])->
165                                                              common.type);
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 ((operand[0])->common.type) {
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 }