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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 | /* | |
75a44ce0 | 9 | * Copyright (C) 2000 - 2008, 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> |
50df4d8b | 46 | #include <acpi/accommon.h> |
1da177e4 LT |
47 | #include <acpi/acinterp.h> |
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 LT |
72 | |
73 | /* We know that source_desc is a buffer by now */ | |
74 | ||
c51a4de8 | 75 | buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); |
1da177e4 LT |
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) || | |
4be44fcd | 83 | (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { |
8313524a | 84 | target_desc->buffer.pointer = ACPI_ALLOCATE(length); |
1da177e4 | 85 | if (!target_desc->buffer.pointer) { |
4be44fcd | 86 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
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) { | |
52fc0b02 | 95 | |
1da177e4 LT |
96 | /* Clear existing buffer and copy in the new one */ |
97 | ||
4be44fcd LB |
98 | ACPI_MEMSET(target_desc->buffer.pointer, 0, |
99 | target_desc->buffer.length); | |
100 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); | |
1da177e4 LT |
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 | |
958dd242 | 107 | * standard. ACPI 3.0_a changes this behavior such that the buffer |
1da177e4 LT |
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) { | |
52fc0b02 | 118 | |
1da177e4 LT |
119 | /* Set the new length of the target */ |
120 | ||
121 | target_desc->buffer.length = length; | |
122 | } | |
123 | #endif | |
4be44fcd | 124 | } else { |
1da177e4 LT |
125 | /* Truncate the source, copy only what will fit */ |
126 | ||
4be44fcd LB |
127 | ACPI_MEMCPY(target_desc->buffer.pointer, buffer, |
128 | target_desc->buffer.length); | |
1da177e4 | 129 | |
4be44fcd LB |
130 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
131 | "Truncating source buffer from %X to %X\n", | |
132 | length, target_desc->buffer.length)); | |
1da177e4 LT |
133 | } |
134 | ||
135 | /* Copy flags */ | |
136 | ||
137 | target_desc->buffer.flags = source_desc->buffer.flags; | |
138 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 139 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
140 | } |
141 | ||
1da177e4 LT |
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 | |
4be44fcd LB |
156 | acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, |
157 | union acpi_operand_object *target_desc) | |
1da177e4 | 158 | { |
4be44fcd LB |
159 | u32 length; |
160 | u8 *buffer; | |
1da177e4 | 161 | |
b229cf92 | 162 | ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); |
1da177e4 LT |
163 | |
164 | /* We know that source_desc is a string by now */ | |
165 | ||
c51a4de8 | 166 | buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); |
1da177e4 LT |
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) && | |
4be44fcd | 174 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
1da177e4 LT |
175 | /* |
176 | * String will fit in existing non-static buffer. | |
177 | * Clear old string and copy in the new one | |
178 | */ | |
4be44fcd LB |
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 { | |
1da177e4 LT |
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 && | |
4be44fcd | 188 | (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { |
52fc0b02 | 189 | |
1da177e4 LT |
190 | /* Only free if not a pointer into the DSDT */ |
191 | ||
8313524a | 192 | ACPI_FREE(target_desc->string.pointer); |
1da177e4 LT |
193 | } |
194 | ||
8313524a BM |
195 | target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) |
196 | length + 1); | |
1da177e4 | 197 | if (!target_desc->string.pointer) { |
4be44fcd | 198 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
199 | } |
200 | ||
201 | target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; | |
4be44fcd | 202 | ACPI_MEMCPY(target_desc->string.pointer, buffer, length); |
1da177e4 LT |
203 | } |
204 | ||
205 | /* Set the new target length */ | |
206 | ||
207 | target_desc->string.length = length; | |
4be44fcd | 208 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 209 | } |