1
2 /******************************************************************************
3 *
4 * Module Name: exstorob - AML Interpreter object store support, store to object
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2004, 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
46 #include <acpi/acpi.h>
47 #include <acpi/acinterp.h>
48
49
50 #define _COMPONENT ACPI_EXECUTER
51 ACPI_MODULE_NAME ("exstorob")
52
53
54 /*******************************************************************************
55 *
56 * FUNCTION: acpi_ex_store_buffer_to_buffer
57 *
58 * PARAMETERS: source_desc - Source object to copy
59 * target_desc - Destination object of the copy
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Copy a buffer object to another buffer object.
64 *
65 ******************************************************************************/
66
67 acpi_status
acpi_ex_store_buffer_to_buffer(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)68 acpi_ex_store_buffer_to_buffer (
69 union acpi_operand_object *source_desc,
70 union acpi_operand_object *target_desc)
71 {
72 u32 length;
73 u8 *buffer;
74
75
76 ACPI_FUNCTION_TRACE_PTR ("ex_store_buffer_to_buffer", source_desc);
77
78
79 /*
80 * We know that source_desc is a buffer by now
81 */
82 buffer = (u8 *) source_desc->buffer.pointer;
83 length = source_desc->buffer.length;
84
85 /*
86 * If target is a buffer of length zero or is a static buffer,
87 * allocate a new buffer of the proper length
88 */
89 if ((target_desc->buffer.length == 0) ||
90 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
91 target_desc->buffer.pointer = ACPI_MEM_ALLOCATE (length);
92 if (!target_desc->buffer.pointer) {
93 return_ACPI_STATUS (AE_NO_MEMORY);
94 }
95
96 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
97 target_desc->buffer.length = length;
98 }
99
100 /*
101 * Buffer is a static allocation,
102 * only place what will fit in the buffer.
103 */
104 if (length <= target_desc->buffer.length) {
105 /* Clear existing buffer and copy in the new one */
106
107 ACPI_MEMSET (target_desc->buffer.pointer, 0, target_desc->buffer.length);
108 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, length);
109 }
110 else {
111 /*
112 * Truncate the source, copy only what will fit
113 */
114 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, target_desc->buffer.length);
115
116 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
117 "Truncating src buffer from %X to %X\n",
118 length, target_desc->buffer.length));
119 }
120
121 /* Copy flags */
122
123 target_desc->buffer.flags = source_desc->buffer.flags;
124 return_ACPI_STATUS (AE_OK);
125 }
126
127
128 /*******************************************************************************
129 *
130 * FUNCTION: acpi_ex_store_string_to_string
131 *
132 * PARAMETERS: source_desc - Source object to copy
133 * target_desc - Destination object of the copy
134 *
135 * RETURN: Status
136 *
137 * DESCRIPTION: Copy a String object to another String object
138 *
139 ******************************************************************************/
140
141 acpi_status
acpi_ex_store_string_to_string(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)142 acpi_ex_store_string_to_string (
143 union acpi_operand_object *source_desc,
144 union acpi_operand_object *target_desc)
145 {
146 u32 length;
147 u8 *buffer;
148
149
150 ACPI_FUNCTION_TRACE_PTR ("ex_store_string_to_string", source_desc);
151
152
153 /*
154 * We know that source_desc is a string by now.
155 */
156 buffer = (u8 *) source_desc->string.pointer;
157 length = source_desc->string.length;
158
159 /*
160 * Replace existing string value if it will fit and the string
161 * pointer is not a static pointer (part of an ACPI table)
162 */
163 if ((length < target_desc->string.length) &&
164 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
165 /*
166 * String will fit in existing non-static buffer.
167 * Clear old string and copy in the new one
168 */
169 ACPI_MEMSET (target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1);
170 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
171 }
172 else {
173 /*
174 * Free the current buffer, then allocate a new buffer
175 * large enough to hold the value
176 */
177 if (target_desc->string.pointer &&
178 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
179 /*
180 * Only free if not a pointer into the DSDT
181 */
182 ACPI_MEM_FREE (target_desc->string.pointer);
183 }
184
185 target_desc->string.pointer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1);
186 if (!target_desc->string.pointer) {
187 return_ACPI_STATUS (AE_NO_MEMORY);
188 }
189
190 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
191 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
192 }
193
194 /* Set the new target length */
195
196 target_desc->string.length = length;
197 return_ACPI_STATUS (AE_OK);
198 }
199
200
201