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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: exstorob - AML Interpreter object store support, store to object | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
77848130 | 8 | * Copyright (C) 2000 - 2012, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 | 44 | #include <acpi/acpi.h> |
e2f7a777 LB |
45 | #include "accommon.h" |
46 | #include "acinterp.h" | |
1da177e4 | 47 | |
1da177e4 | 48 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 49 | ACPI_MODULE_NAME("exstorob") |
1da177e4 LT |
50 | |
51 | /******************************************************************************* | |
52 | * | |
53 | * FUNCTION: acpi_ex_store_buffer_to_buffer | |
54 | * | |
55 | * PARAMETERS: source_desc - Source object to copy | |
56 | * target_desc - Destination object of the copy | |
57 | * | |
58 | * RETURN: Status | |
59 | * | |
60 | * DESCRIPTION: Copy a buffer object to another buffer object. | |
61 | * | |
62 | ******************************************************************************/ | |
1da177e4 | 63 | acpi_status |
4be44fcd LB |
64 | acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, |
65 | union acpi_operand_object *target_desc) | |
1da177e4 | 66 | { |
4be44fcd LB |
67 | u32 length; |
68 | u8 *buffer; | |
1da177e4 | 69 | |
b229cf92 | 70 | ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc); |
1da177e4 | 71 | |
b0de22bd LM |
72 | /* If Source and Target are the same, just return */ |
73 | ||
74 | if (source_desc == target_desc) { | |
75 | return_ACPI_STATUS(AE_OK); | |
76 | } | |
77 | ||
1da177e4 LT |
78 | /* We know that source_desc is a buffer by now */ |
79 | ||
c51a4de8 | 80 | buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); |
1da177e4 LT |
81 | length = source_desc->buffer.length; |
82 | ||
83 | /* | |
84 | * If target is a buffer of length zero or is a static buffer, | |
85 | * allocate a new buffer of the proper length | |
86 | */ | |
87 | if ((target_desc->buffer.length == 0) || | |
4be44fcd | 88 | (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { |
8313524a | 89 | target_desc->buffer.pointer = ACPI_ALLOCATE(length); |
1da177e4 | 90 | if (!target_desc->buffer.pointer) { |
4be44fcd | 91 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
92 | } |
93 | ||
94 | target_desc->buffer.length = length; | |
95 | } | |
96 | ||
97 | /* Copy source buffer to target buffer */ | |
98 | ||
99 | if (length <= target_desc->buffer.length) { | |
52fc0b02 | 100 | |
1da177e4 LT |
101 | /* Clear existing buffer and copy in the new one */ |
102 | ||
4be44fcd LB |
103 | ACPI_MEMSET(target_desc->buffer.pointer, 0, |
104 | target_desc->buffer.length); | |
105 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); | |
1da177e4 LT |
106 | |
107 | #ifdef ACPI_OBSOLETE_BEHAVIOR | |
108 | /* | |
109 | * NOTE: ACPI versions up to 3.0 specified that the buffer must be | |
73a3090a | 110 | * truncated if the string is smaller than the buffer. However, "other" |
1da177e4 | 111 | * implementations of ACPI never did this and thus became the defacto |
ba494bee | 112 | * standard. ACPI 3.0A changes this behavior such that the buffer |
1da177e4 LT |
113 | * is no longer truncated. |
114 | */ | |
115 | ||
116 | /* | |
117 | * OBSOLETE BEHAVIOR: | |
118 | * If the original source was a string, we must truncate the buffer, | |
73a3090a | 119 | * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer |
1da177e4 LT |
120 | * copy must not truncate the original buffer. |
121 | */ | |
122 | if (original_src_type == ACPI_TYPE_STRING) { | |
52fc0b02 | 123 | |
1da177e4 LT |
124 | /* Set the new length of the target */ |
125 | ||
126 | target_desc->buffer.length = length; | |
127 | } | |
128 | #endif | |
4be44fcd | 129 | } else { |
1da177e4 LT |
130 | /* Truncate the source, copy only what will fit */ |
131 | ||
4be44fcd LB |
132 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, |
133 | target_desc->buffer.length); | |
1da177e4 | 134 | |
4be44fcd LB |
135 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
136 | "Truncating source buffer from %X to %X\n", | |
137 | length, target_desc->buffer.length)); | |
1da177e4 LT |
138 | } |
139 | ||
140 | /* Copy flags */ | |
141 | ||
142 | target_desc->buffer.flags = source_desc->buffer.flags; | |
143 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 144 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
145 | } |
146 | ||
1da177e4 LT |
147 | /******************************************************************************* |
148 | * | |
149 | * FUNCTION: acpi_ex_store_string_to_string | |
150 | * | |
151 | * PARAMETERS: source_desc - Source object to copy | |
152 | * target_desc - Destination object of the copy | |
153 | * | |
154 | * RETURN: Status | |
155 | * | |
156 | * DESCRIPTION: Copy a String object to another String object | |
157 | * | |
158 | ******************************************************************************/ | |
159 | ||
160 | acpi_status | |
4be44fcd LB |
161 | acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, |
162 | union acpi_operand_object *target_desc) | |
1da177e4 | 163 | { |
4be44fcd LB |
164 | u32 length; |
165 | u8 *buffer; | |
1da177e4 | 166 | |
b229cf92 | 167 | ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); |
1da177e4 | 168 | |
b0de22bd LM |
169 | /* If Source and Target are the same, just return */ |
170 | ||
171 | if (source_desc == target_desc) { | |
172 | return_ACPI_STATUS(AE_OK); | |
173 | } | |
174 | ||
1da177e4 LT |
175 | /* We know that source_desc is a string by now */ |
176 | ||
c51a4de8 | 177 | buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); |
1da177e4 LT |
178 | length = source_desc->string.length; |
179 | ||
180 | /* | |
181 | * Replace existing string value if it will fit and the string | |
182 | * pointer is not a static pointer (part of an ACPI table) | |
183 | */ | |
184 | if ((length < target_desc->string.length) && | |
4be44fcd | 185 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
1da177e4 LT |
186 | /* |
187 | * String will fit in existing non-static buffer. | |
188 | * Clear old string and copy in the new one | |
189 | */ | |
4be44fcd LB |
190 | ACPI_MEMSET(target_desc->string.pointer, 0, |
191 | (acpi_size) target_desc->string.length + 1); | |
192 | ACPI_MEMCPY(target_desc->string.pointer, buffer, length); | |
193 | } else { | |
1da177e4 LT |
194 | /* |
195 | * Free the current buffer, then allocate a new buffer | |
196 | * large enough to hold the value | |
197 | */ | |
198 | if (target_desc->string.pointer && | |
4be44fcd | 199 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
52fc0b02 | 200 | |
1da177e4 LT |
201 | /* Only free if not a pointer into the DSDT */ |
202 | ||
8313524a | 203 | ACPI_FREE(target_desc->string.pointer); |
1da177e4 LT |
204 | } |
205 | ||
8313524a BM |
206 | target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) |
207 | length + 1); | |
1da177e4 | 208 | if (!target_desc->string.pointer) { |
4be44fcd | 209 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
210 | } |
211 | ||
212 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 213 | ACPI_MEMCPY(target_desc->string.pointer, buffer, length); |
1da177e4 LT |
214 | } |
215 | ||
216 | /* Set the new target length */ | |
217 | ||
218 | target_desc->string.length = length; | |
4be44fcd | 219 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 220 | } |