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Linux kernel mirror (for testing)
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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#include <acpi/acpi.h>
46#include <acpi/acinterp.h>
47
48#define _COMPONENT ACPI_EXECUTER
49ACPI_MODULE_NAME("exstorob")
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 ******************************************************************************/
63acpi_status
64acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
65 union acpi_operand_object *target_desc)
66{
67 u32 length;
68 u8 *buffer;
69
70 ACPI_FUNCTION_TRACE_PTR("ex_store_buffer_to_buffer", source_desc);
71
72 /* We know that source_desc is a buffer by now */
73
74 buffer = (u8 *) source_desc->buffer.pointer;
75 length = source_desc->buffer.length;
76
77 /*
78 * If target is a buffer of length zero or is a static buffer,
79 * allocate a new buffer of the proper length
80 */
81 if ((target_desc->buffer.length == 0) ||
82 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
83 target_desc->buffer.pointer = ACPI_MEM_ALLOCATE(length);
84 if (!target_desc->buffer.pointer) {
85 return_ACPI_STATUS(AE_NO_MEMORY);
86 }
87
88 target_desc->buffer.length = length;
89 }
90
91 /* Copy source buffer to target buffer */
92
93 if (length <= target_desc->buffer.length) {
94 /* Clear existing buffer and copy in the new one */
95
96 ACPI_MEMSET(target_desc->buffer.pointer, 0,
97 target_desc->buffer.length);
98 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length);
99
100#ifdef ACPI_OBSOLETE_BEHAVIOR
101 /*
102 * NOTE: ACPI versions up to 3.0 specified that the buffer must be
103 * truncated if the string is smaller than the buffer. However, "other"
104 * implementations of ACPI never did this and thus became the defacto
105 * standard. ACPi 3.0_a changes this behavior such that the buffer
106 * is no longer truncated.
107 */
108
109 /*
110 * OBSOLETE BEHAVIOR:
111 * If the original source was a string, we must truncate the buffer,
112 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
113 * copy must not truncate the original buffer.
114 */
115 if (original_src_type == ACPI_TYPE_STRING) {
116 /* Set the new length of the target */
117
118 target_desc->buffer.length = length;
119 }
120#endif
121 } else {
122 /* Truncate the source, copy only what will fit */
123
124 ACPI_MEMCPY(target_desc->buffer.pointer, buffer,
125 target_desc->buffer.length);
126
127 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
128 "Truncating source buffer from %X to %X\n",
129 length, target_desc->buffer.length));
130 }
131
132 /* Copy flags */
133
134 target_desc->buffer.flags = source_desc->buffer.flags;
135 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
136 return_ACPI_STATUS(AE_OK);
137}
138
139/*******************************************************************************
140 *
141 * FUNCTION: acpi_ex_store_string_to_string
142 *
143 * PARAMETERS: source_desc - Source object to copy
144 * target_desc - Destination object of the copy
145 *
146 * RETURN: Status
147 *
148 * DESCRIPTION: Copy a String object to another String object
149 *
150 ******************************************************************************/
151
152acpi_status
153acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
154 union acpi_operand_object *target_desc)
155{
156 u32 length;
157 u8 *buffer;
158
159 ACPI_FUNCTION_TRACE_PTR("ex_store_string_to_string", source_desc);
160
161 /* We know that source_desc is a string by now */
162
163 buffer = (u8 *) source_desc->string.pointer;
164 length = source_desc->string.length;
165
166 /*
167 * Replace existing string value if it will fit and the string
168 * pointer is not a static pointer (part of an ACPI table)
169 */
170 if ((length < target_desc->string.length) &&
171 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
172 /*
173 * String will fit in existing non-static buffer.
174 * Clear old string and copy in the new one
175 */
176 ACPI_MEMSET(target_desc->string.pointer, 0,
177 (acpi_size) target_desc->string.length + 1);
178 ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
179 } else {
180 /*
181 * Free the current buffer, then allocate a new buffer
182 * large enough to hold the value
183 */
184 if (target_desc->string.pointer &&
185 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
186 /* Only free if not a pointer into the DSDT */
187
188 ACPI_MEM_FREE(target_desc->string.pointer);
189 }
190
191 target_desc->string.pointer = ACPI_MEM_CALLOCATE((acpi_size)
192 length + 1);
193 if (!target_desc->string.pointer) {
194 return_ACPI_STATUS(AE_NO_MEMORY);
195 }
196
197 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
198 ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
199 }
200
201 /* Set the new target length */
202
203 target_desc->string.length = length;
204 return_ACPI_STATUS(AE_OK);
205}