1
2 /******************************************************************************
3 *
4 * Module Name: exstorob - AML Interpreter object store support, store to object
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 "accommon.h"
47 #include "acinterp.h"
48
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME("exstorob")
51
52 /*******************************************************************************
53 *
54 * FUNCTION: acpi_ex_store_buffer_to_buffer
55 *
56 * PARAMETERS: source_desc - Source object to copy
57 * target_desc - Destination object of the copy
58 *
59 * RETURN: Status
60 *
61 * DESCRIPTION: Copy a buffer object to another buffer object.
62 *
63 ******************************************************************************/
64 acpi_status
acpi_ex_store_buffer_to_buffer(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)65 acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
66 union acpi_operand_object *target_desc)
67 {
68 u32 length;
69 u8 *buffer;
70
71 ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
72
73 /* We know that source_desc is a buffer by now */
74
75 buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
76 length = source_desc->buffer.length;
77
78 /*
79 * If target is a buffer of length zero or is a static buffer,
80 * allocate a new buffer of the proper length
81 */
82 if ((target_desc->buffer.length == 0) ||
83 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
84 target_desc->buffer.pointer = ACPI_ALLOCATE(length);
85 if (!target_desc->buffer.pointer) {
86 return_ACPI_STATUS(AE_NO_MEMORY);
87 }
88
89 target_desc->buffer.length = length;
90 }
91
92 /* Copy source buffer to target buffer */
93
94 if (length <= target_desc->buffer.length) {
95
96 /* Clear existing buffer and copy in the new one */
97
98 ACPI_MEMSET(target_desc->buffer.pointer, 0,
99 target_desc->buffer.length);
100 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length);
101
102 #ifdef ACPI_OBSOLETE_BEHAVIOR
103 /*
104 * NOTE: ACPI versions up to 3.0 specified that the buffer must be
105 * truncated if the string is smaller than the buffer. However, "other"
106 * implementations of ACPI never did this and thus became the defacto
107 * standard. ACPI 3.0_a changes this behavior such that the buffer
108 * is no longer truncated.
109 */
110
111 /*
112 * OBSOLETE BEHAVIOR:
113 * If the original source was a string, we must truncate the buffer,
114 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
115 * copy must not truncate the original buffer.
116 */
117 if (original_src_type == ACPI_TYPE_STRING) {
118
119 /* Set the new length of the target */
120
121 target_desc->buffer.length = length;
122 }
123 #endif
124 } else {
125 /* Truncate the source, copy only what will fit */
126
127 ACPI_MEMCPY(target_desc->buffer.pointer, buffer,
128 target_desc->buffer.length);
129
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
131 "Truncating source buffer from %X to %X\n",
132 length, target_desc->buffer.length));
133 }
134
135 /* Copy flags */
136
137 target_desc->buffer.flags = source_desc->buffer.flags;
138 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
139 return_ACPI_STATUS(AE_OK);
140 }
141
142 /*******************************************************************************
143 *
144 * FUNCTION: acpi_ex_store_string_to_string
145 *
146 * PARAMETERS: source_desc - Source object to copy
147 * target_desc - Destination object of the copy
148 *
149 * RETURN: Status
150 *
151 * DESCRIPTION: Copy a String object to another String object
152 *
153 ******************************************************************************/
154
155 acpi_status
acpi_ex_store_string_to_string(union acpi_operand_object * source_desc,union acpi_operand_object * target_desc)156 acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
157 union acpi_operand_object *target_desc)
158 {
159 u32 length;
160 u8 *buffer;
161
162 ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
163
164 /* We know that source_desc is a string by now */
165
166 buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
167 length = source_desc->string.length;
168
169 /*
170 * Replace existing string value if it will fit and the string
171 * pointer is not a static pointer (part of an ACPI table)
172 */
173 if ((length < target_desc->string.length) &&
174 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
175 /*
176 * String will fit in existing non-static buffer.
177 * Clear old string and copy in the new one
178 */
179 ACPI_MEMSET(target_desc->string.pointer, 0,
180 (acpi_size) target_desc->string.length + 1);
181 ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
182 } else {
183 /*
184 * Free the current buffer, then allocate a new buffer
185 * large enough to hold the value
186 */
187 if (target_desc->string.pointer &&
188 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
189
190 /* Only free if not a pointer into the DSDT */
191
192 ACPI_FREE(target_desc->string.pointer);
193 }
194
195 target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size)
196 length + 1);
197 if (!target_desc->string.pointer) {
198 return_ACPI_STATUS(AE_NO_MEMORY);
199 }
200
201 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
202 ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
203 }
204
205 /* Set the new target length */
206
207 target_desc->string.length = length;
208 return_ACPI_STATUS(AE_OK);
209 }
210