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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exstorob - AML Interpreter object store support, store to object | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
b4e104ea | 9 | * Copyright (C) 2000 - 2011, Intel Corp. |
1da177e4 LT |
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 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acinterp.h" | |
1da177e4 | 48 | |
1da177e4 | 49 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 50 | ACPI_MODULE_NAME("exstorob") |
1da177e4 LT |
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 | ******************************************************************************/ | |
1da177e4 | 64 | acpi_status |
4be44fcd LB |
65 | acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, |
66 | union acpi_operand_object *target_desc) | |
1da177e4 | 67 | { |
4be44fcd LB |
68 | u32 length; |
69 | u8 *buffer; | |
1da177e4 | 70 | |
b229cf92 | 71 | ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc); |
1da177e4 | 72 | |
b0de22bd LM |
73 | /* If Source and Target are the same, just return */ |
74 | ||
75 | if (source_desc == target_desc) { | |
76 | return_ACPI_STATUS(AE_OK); | |
77 | } | |
78 | ||
1da177e4 LT |
79 | /* We know that source_desc is a buffer by now */ |
80 | ||
c51a4de8 | 81 | buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); |
1da177e4 LT |
82 | length = source_desc->buffer.length; |
83 | ||
84 | /* | |
85 | * If target is a buffer of length zero or is a static buffer, | |
86 | * allocate a new buffer of the proper length | |
87 | */ | |
88 | if ((target_desc->buffer.length == 0) || | |
4be44fcd | 89 | (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { |
8313524a | 90 | target_desc->buffer.pointer = ACPI_ALLOCATE(length); |
1da177e4 | 91 | if (!target_desc->buffer.pointer) { |
4be44fcd | 92 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
93 | } |
94 | ||
95 | target_desc->buffer.length = length; | |
96 | } | |
97 | ||
98 | /* Copy source buffer to target buffer */ | |
99 | ||
100 | if (length <= target_desc->buffer.length) { | |
52fc0b02 | 101 | |
1da177e4 LT |
102 | /* Clear existing buffer and copy in the new one */ |
103 | ||
4be44fcd LB |
104 | ACPI_MEMSET(target_desc->buffer.pointer, 0, |
105 | target_desc->buffer.length); | |
106 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); | |
1da177e4 LT |
107 | |
108 | #ifdef ACPI_OBSOLETE_BEHAVIOR | |
109 | /* | |
110 | * NOTE: ACPI versions up to 3.0 specified that the buffer must be | |
111 | * truncated if the string is smaller than the buffer. However, "other" | |
112 | * implementations of ACPI never did this and thus became the defacto | |
958dd242 | 113 | * standard. ACPI 3.0_a changes this behavior such that the buffer |
1da177e4 LT |
114 | * is no longer truncated. |
115 | */ | |
116 | ||
117 | /* | |
118 | * OBSOLETE BEHAVIOR: | |
119 | * If the original source was a string, we must truncate the buffer, | |
120 | * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer | |
121 | * copy must not truncate the original buffer. | |
122 | */ | |
123 | if (original_src_type == ACPI_TYPE_STRING) { | |
52fc0b02 | 124 | |
1da177e4 LT |
125 | /* Set the new length of the target */ |
126 | ||
127 | target_desc->buffer.length = length; | |
128 | } | |
129 | #endif | |
4be44fcd | 130 | } else { |
1da177e4 LT |
131 | /* Truncate the source, copy only what will fit */ |
132 | ||
4be44fcd LB |
133 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, |
134 | target_desc->buffer.length); | |
1da177e4 | 135 | |
4be44fcd LB |
136 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
137 | "Truncating source buffer from %X to %X\n", | |
138 | length, target_desc->buffer.length)); | |
1da177e4 LT |
139 | } |
140 | ||
141 | /* Copy flags */ | |
142 | ||
143 | target_desc->buffer.flags = source_desc->buffer.flags; | |
144 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 145 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
146 | } |
147 | ||
1da177e4 LT |
148 | /******************************************************************************* |
149 | * | |
150 | * FUNCTION: acpi_ex_store_string_to_string | |
151 | * | |
152 | * PARAMETERS: source_desc - Source object to copy | |
153 | * target_desc - Destination object of the copy | |
154 | * | |
155 | * RETURN: Status | |
156 | * | |
157 | * DESCRIPTION: Copy a String object to another String object | |
158 | * | |
159 | ******************************************************************************/ | |
160 | ||
161 | acpi_status | |
4be44fcd LB |
162 | acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, |
163 | union acpi_operand_object *target_desc) | |
1da177e4 | 164 | { |
4be44fcd LB |
165 | u32 length; |
166 | u8 *buffer; | |
1da177e4 | 167 | |
b229cf92 | 168 | ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); |
1da177e4 | 169 | |
b0de22bd LM |
170 | /* If Source and Target are the same, just return */ |
171 | ||
172 | if (source_desc == target_desc) { | |
173 | return_ACPI_STATUS(AE_OK); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* We know that source_desc is a string by now */ |
177 | ||
c51a4de8 | 178 | buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); |
1da177e4 LT |
179 | length = source_desc->string.length; |
180 | ||
181 | /* | |
182 | * Replace existing string value if it will fit and the string | |
183 | * pointer is not a static pointer (part of an ACPI table) | |
184 | */ | |
185 | if ((length < target_desc->string.length) && | |
4be44fcd | 186 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
1da177e4 LT |
187 | /* |
188 | * String will fit in existing non-static buffer. | |
189 | * Clear old string and copy in the new one | |
190 | */ | |
4be44fcd LB |
191 | ACPI_MEMSET(target_desc->string.pointer, 0, |
192 | (acpi_size) target_desc->string.length + 1); | |
193 | ACPI_MEMCPY(target_desc->string.pointer, buffer, length); | |
194 | } else { | |
1da177e4 LT |
195 | /* |
196 | * Free the current buffer, then allocate a new buffer | |
197 | * large enough to hold the value | |
198 | */ | |
199 | if (target_desc->string.pointer && | |
4be44fcd | 200 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
52fc0b02 | 201 | |
1da177e4 LT |
202 | /* Only free if not a pointer into the DSDT */ |
203 | ||
8313524a | 204 | ACPI_FREE(target_desc->string.pointer); |
1da177e4 LT |
205 | } |
206 | ||
8313524a BM |
207 | target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) |
208 | length + 1); | |
1da177e4 | 209 | if (!target_desc->string.pointer) { |
4be44fcd | 210 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
211 | } |
212 | ||
213 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 214 | ACPI_MEMCPY(target_desc->string.pointer, buffer, length); |
1da177e4 LT |
215 | } |
216 | ||
217 | /* Set the new target length */ | |
218 | ||
219 | target_desc->string.length = length; | |
4be44fcd | 220 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 221 | } |