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1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exstorob - AML Interpreter object store support, store to object | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
9 | * Copyright (C) 2000 - 2005, 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 | |
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 | /* We know that source_desc is a buffer by now */ | |
80 | ||
81 | buffer = (u8 *) source_desc->buffer.pointer; | |
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) || | |
89 | (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { | |
90 | target_desc->buffer.pointer = ACPI_MEM_ALLOCATE (length); | |
91 | if (!target_desc->buffer.pointer) { | |
92 | return_ACPI_STATUS (AE_NO_MEMORY); | |
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) { | |
101 | /* Clear existing buffer and copy in the new one */ | |
102 | ||
103 | ACPI_MEMSET (target_desc->buffer.pointer, 0, target_desc->buffer.length); | |
104 | ACPI_MEMCPY (target_desc->buffer.pointer, buffer, length); | |
105 | ||
106 | #ifdef ACPI_OBSOLETE_BEHAVIOR | |
107 | /* | |
108 | * NOTE: ACPI versions up to 3.0 specified that the buffer must be | |
109 | * truncated if the string is smaller than the buffer. However, "other" | |
110 | * implementations of ACPI never did this and thus became the defacto | |
111 | * standard. ACPi 3.0_a changes this behavior such that the buffer | |
112 | * is no longer truncated. | |
113 | */ | |
114 | ||
115 | /* | |
116 | * OBSOLETE BEHAVIOR: | |
117 | * If the original source was a string, we must truncate the buffer, | |
118 | * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer | |
119 | * copy must not truncate the original buffer. | |
120 | */ | |
121 | if (original_src_type == ACPI_TYPE_STRING) { | |
122 | /* Set the new length of the target */ | |
123 | ||
124 | target_desc->buffer.length = length; | |
125 | } | |
126 | #endif | |
127 | } | |
128 | else { | |
129 | /* Truncate the source, copy only what will fit */ | |
130 | ||
131 | ACPI_MEMCPY (target_desc->buffer.pointer, buffer, target_desc->buffer.length); | |
132 | ||
133 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, | |
134 | "Truncating source buffer from %X to %X\n", | |
135 | length, target_desc->buffer.length)); | |
136 | } | |
137 | ||
138 | /* Copy flags */ | |
139 | ||
140 | target_desc->buffer.flags = source_desc->buffer.flags; | |
141 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
142 | return_ACPI_STATUS (AE_OK); | |
143 | } | |
144 | ||
145 | ||
146 | /******************************************************************************* | |
147 | * | |
148 | * FUNCTION: acpi_ex_store_string_to_string | |
149 | * | |
150 | * PARAMETERS: source_desc - Source object to copy | |
151 | * target_desc - Destination object of the copy | |
152 | * | |
153 | * RETURN: Status | |
154 | * | |
155 | * DESCRIPTION: Copy a String object to another String object | |
156 | * | |
157 | ******************************************************************************/ | |
158 | ||
159 | acpi_status | |
160 | acpi_ex_store_string_to_string ( | |
161 | union acpi_operand_object *source_desc, | |
162 | union acpi_operand_object *target_desc) | |
163 | { | |
164 | u32 length; | |
165 | u8 *buffer; | |
166 | ||
167 | ||
168 | ACPI_FUNCTION_TRACE_PTR ("ex_store_string_to_string", source_desc); | |
169 | ||
170 | ||
171 | /* We know that source_desc is a string by now */ | |
172 | ||
173 | buffer = (u8 *) source_desc->string.pointer; | |
174 | length = source_desc->string.length; | |
175 | ||
176 | /* | |
177 | * Replace existing string value if it will fit and the string | |
178 | * pointer is not a static pointer (part of an ACPI table) | |
179 | */ | |
180 | if ((length < target_desc->string.length) && | |
181 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { | |
182 | /* | |
183 | * String will fit in existing non-static buffer. | |
184 | * Clear old string and copy in the new one | |
185 | */ | |
186 | ACPI_MEMSET (target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1); | |
187 | ACPI_MEMCPY (target_desc->string.pointer, buffer, length); | |
188 | } | |
189 | else { | |
190 | /* | |
191 | * Free the current buffer, then allocate a new buffer | |
192 | * large enough to hold the value | |
193 | */ | |
194 | if (target_desc->string.pointer && | |
195 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { | |
196 | /* Only free if not a pointer into the DSDT */ | |
197 | ||
198 | ACPI_MEM_FREE (target_desc->string.pointer); | |
199 | } | |
200 | ||
201 | target_desc->string.pointer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1); | |
202 | if (!target_desc->string.pointer) { | |
203 | return_ACPI_STATUS (AE_NO_MEMORY); | |
204 | } | |
205 | ||
206 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
207 | ACPI_MEMCPY (target_desc->string.pointer, buffer, length); | |
208 | } | |
209 | ||
210 | /* Set the new target length */ | |
211 | ||
212 | target_desc->string.length = length; | |
213 | return_ACPI_STATUS (AE_OK); | |
214 | } | |
215 | ||
216 |