1 | /****************************************************************************** |
2 | * |
3 | * Module Name: exstorob - AML object store support, store to object |
4 | * |
5 | *****************************************************************************/ |
6 | |
7 | /* |
8 | * Copyright (C) 2000 - 2016, Intel Corp. |
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 | |
44 | #include "acpi.h" |
45 | #include "accommon.h" |
46 | #include "acinterp.h" |
47 | |
48 | |
49 | #define _COMPONENT ACPI_EXECUTER |
50 | ACPI_MODULE_NAME ("exstorob" ) |
51 | |
52 | |
53 | /******************************************************************************* |
54 | * |
55 | * FUNCTION: AcpiExStoreBufferToBuffer |
56 | * |
57 | * PARAMETERS: SourceDesc - Source object to copy |
58 | * TargetDesc - Destination object of the copy |
59 | * |
60 | * RETURN: Status |
61 | * |
62 | * DESCRIPTION: Copy a buffer object to another buffer object. |
63 | * |
64 | ******************************************************************************/ |
65 | |
66 | ACPI_STATUS |
67 | AcpiExStoreBufferToBuffer ( |
68 | ACPI_OPERAND_OBJECT *SourceDesc, |
69 | ACPI_OPERAND_OBJECT *TargetDesc) |
70 | { |
71 | UINT32 Length; |
72 | UINT8 *Buffer; |
73 | |
74 | |
75 | ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc); |
76 | |
77 | |
78 | /* If Source and Target are the same, just return */ |
79 | |
80 | if (SourceDesc == TargetDesc) |
81 | { |
82 | return_ACPI_STATUS (AE_OK); |
83 | } |
84 | |
85 | /* We know that SourceDesc is a buffer by now */ |
86 | |
87 | Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer); |
88 | Length = SourceDesc->Buffer.Length; |
89 | |
90 | /* |
91 | * If target is a buffer of length zero or is a static buffer, |
92 | * allocate a new buffer of the proper length |
93 | */ |
94 | if ((TargetDesc->Buffer.Length == 0) || |
95 | (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)) |
96 | { |
97 | TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length); |
98 | if (!TargetDesc->Buffer.Pointer) |
99 | { |
100 | return_ACPI_STATUS (AE_NO_MEMORY); |
101 | } |
102 | |
103 | TargetDesc->Buffer.Length = Length; |
104 | } |
105 | |
106 | /* Copy source buffer to target buffer */ |
107 | |
108 | if (Length <= TargetDesc->Buffer.Length) |
109 | { |
110 | /* Clear existing buffer and copy in the new one */ |
111 | |
112 | memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length); |
113 | memcpy (TargetDesc->Buffer.Pointer, Buffer, Length); |
114 | |
115 | #ifdef ACPI_OBSOLETE_BEHAVIOR |
116 | /* |
117 | * NOTE: ACPI versions up to 3.0 specified that the buffer must be |
118 | * truncated if the string is smaller than the buffer. However, "other" |
119 | * implementations of ACPI never did this and thus became the defacto |
120 | * standard. ACPI 3.0A changes this behavior such that the buffer |
121 | * is no longer truncated. |
122 | */ |
123 | |
124 | /* |
125 | * OBSOLETE BEHAVIOR: |
126 | * If the original source was a string, we must truncate the buffer, |
127 | * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer |
128 | * copy must not truncate the original buffer. |
129 | */ |
130 | if (OriginalSrcType == ACPI_TYPE_STRING) |
131 | { |
132 | /* Set the new length of the target */ |
133 | |
134 | TargetDesc->Buffer.Length = Length; |
135 | } |
136 | #endif |
137 | } |
138 | else |
139 | { |
140 | /* Truncate the source, copy only what will fit */ |
141 | |
142 | memcpy (TargetDesc->Buffer.Pointer, Buffer, |
143 | TargetDesc->Buffer.Length); |
144 | |
145 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, |
146 | "Truncating source buffer from %X to %X\n" , |
147 | Length, TargetDesc->Buffer.Length)); |
148 | } |
149 | |
150 | /* Copy flags */ |
151 | |
152 | TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags; |
153 | TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; |
154 | return_ACPI_STATUS (AE_OK); |
155 | } |
156 | |
157 | |
158 | /******************************************************************************* |
159 | * |
160 | * FUNCTION: AcpiExStoreStringToString |
161 | * |
162 | * PARAMETERS: SourceDesc - Source object to copy |
163 | * TargetDesc - Destination object of the copy |
164 | * |
165 | * RETURN: Status |
166 | * |
167 | * DESCRIPTION: Copy a String object to another String object |
168 | * |
169 | ******************************************************************************/ |
170 | |
171 | ACPI_STATUS |
172 | AcpiExStoreStringToString ( |
173 | ACPI_OPERAND_OBJECT *SourceDesc, |
174 | ACPI_OPERAND_OBJECT *TargetDesc) |
175 | { |
176 | UINT32 Length; |
177 | UINT8 *Buffer; |
178 | |
179 | |
180 | ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc); |
181 | |
182 | |
183 | /* If Source and Target are the same, just return */ |
184 | |
185 | if (SourceDesc == TargetDesc) |
186 | { |
187 | return_ACPI_STATUS (AE_OK); |
188 | } |
189 | |
190 | /* We know that SourceDesc is a string by now */ |
191 | |
192 | Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer); |
193 | Length = SourceDesc->String.Length; |
194 | |
195 | /* |
196 | * Replace existing string value if it will fit and the string |
197 | * pointer is not a static pointer (part of an ACPI table) |
198 | */ |
199 | if ((Length < TargetDesc->String.Length) && |
200 | (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) |
201 | { |
202 | /* |
203 | * String will fit in existing non-static buffer. |
204 | * Clear old string and copy in the new one |
205 | */ |
206 | memset (TargetDesc->String.Pointer, 0, |
207 | (ACPI_SIZE) TargetDesc->String.Length + 1); |
208 | memcpy (TargetDesc->String.Pointer, Buffer, Length); |
209 | } |
210 | else |
211 | { |
212 | /* |
213 | * Free the current buffer, then allocate a new buffer |
214 | * large enough to hold the value |
215 | */ |
216 | if (TargetDesc->String.Pointer && |
217 | (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) |
218 | { |
219 | /* Only free if not a pointer into the DSDT */ |
220 | |
221 | ACPI_FREE (TargetDesc->String.Pointer); |
222 | } |
223 | |
224 | TargetDesc->String.Pointer = |
225 | ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1); |
226 | |
227 | if (!TargetDesc->String.Pointer) |
228 | { |
229 | return_ACPI_STATUS (AE_NO_MEMORY); |
230 | } |
231 | |
232 | TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; |
233 | memcpy (TargetDesc->String.Pointer, Buffer, Length); |
234 | } |
235 | |
236 | /* Set the new target length */ |
237 | |
238 | TargetDesc->String.Length = Length; |
239 | return_ACPI_STATUS (AE_OK); |
240 | } |
241 | |