2 /******************************************************************************
4 * Module Name: exstorob - AML Interpreter object store support, store to object
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2010, Intel Corp.
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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.
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
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42 * POSSIBILITY OF SUCH DAMAGES.
45 #include <acpi/acpi.h>
49 #define _COMPONENT ACPI_EXECUTER
50 ACPI_MODULE_NAME("exstorob")
52 /*******************************************************************************
54 * FUNCTION: acpi_ex_store_buffer_to_buffer
56 * PARAMETERS: source_desc - Source object to copy
57 * target_desc - Destination object of the copy
61 * DESCRIPTION: Copy a buffer object to another buffer object.
63 ******************************************************************************/
65 acpi_ex_store_buffer_to_buffer(union acpi_operand_object
*source_desc
,
66 union acpi_operand_object
*target_desc
)
71 ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer
, source_desc
);
73 /* If Source and Target are the same, just return */
75 if (source_desc
== target_desc
) {
76 return_ACPI_STATUS(AE_OK
);
79 /* We know that source_desc is a buffer by now */
81 buffer
= ACPI_CAST_PTR(u8
, source_desc
->buffer
.pointer
);
82 length
= source_desc
->buffer
.length
;
85 * If target is a buffer of length zero or is a static buffer,
86 * allocate a new buffer of the proper length
88 if ((target_desc
->buffer
.length
== 0) ||
89 (target_desc
->common
.flags
& AOPOBJ_STATIC_POINTER
)) {
90 target_desc
->buffer
.pointer
= ACPI_ALLOCATE(length
);
91 if (!target_desc
->buffer
.pointer
) {
92 return_ACPI_STATUS(AE_NO_MEMORY
);
95 target_desc
->buffer
.length
= length
;
98 /* Copy source buffer to target buffer */
100 if (length
<= target_desc
->buffer
.length
) {
102 /* Clear existing buffer and copy in the new one */
104 ACPI_MEMSET(target_desc
->buffer
.pointer
, 0,
105 target_desc
->buffer
.length
);
106 ACPI_MEMCPY(target_desc
->buffer
.pointer
, buffer
, length
);
108 #ifdef ACPI_OBSOLETE_BEHAVIOR
110 * NOTE: ACPI versions up to 3.0 specified that the buffer must be
111 * truncated if the string is smaller than the buffer. However, "other"
112 * implementations of ACPI never did this and thus became the defacto
113 * standard. ACPI 3.0_a changes this behavior such that the buffer
114 * is no longer truncated.
119 * If the original source was a string, we must truncate the buffer,
120 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
121 * copy must not truncate the original buffer.
123 if (original_src_type
== ACPI_TYPE_STRING
) {
125 /* Set the new length of the target */
127 target_desc
->buffer
.length
= length
;
131 /* Truncate the source, copy only what will fit */
133 ACPI_MEMCPY(target_desc
->buffer
.pointer
, buffer
,
134 target_desc
->buffer
.length
);
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
137 "Truncating source buffer from %X to %X\n",
138 length
, target_desc
->buffer
.length
));
143 target_desc
->buffer
.flags
= source_desc
->buffer
.flags
;
144 target_desc
->common
.flags
&= ~AOPOBJ_STATIC_POINTER
;
145 return_ACPI_STATUS(AE_OK
);
148 /*******************************************************************************
150 * FUNCTION: acpi_ex_store_string_to_string
152 * PARAMETERS: source_desc - Source object to copy
153 * target_desc - Destination object of the copy
157 * DESCRIPTION: Copy a String object to another String object
159 ******************************************************************************/
162 acpi_ex_store_string_to_string(union acpi_operand_object
*source_desc
,
163 union acpi_operand_object
*target_desc
)
168 ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string
, source_desc
);
170 /* If Source and Target are the same, just return */
172 if (source_desc
== target_desc
) {
173 return_ACPI_STATUS(AE_OK
);
176 /* We know that source_desc is a string by now */
178 buffer
= ACPI_CAST_PTR(u8
, source_desc
->string
.pointer
);
179 length
= source_desc
->string
.length
;
182 * Replace existing string value if it will fit and the string
183 * pointer is not a static pointer (part of an ACPI table)
185 if ((length
< target_desc
->string
.length
) &&
186 (!(target_desc
->common
.flags
& AOPOBJ_STATIC_POINTER
))) {
188 * String will fit in existing non-static buffer.
189 * Clear old string and copy in the new one
191 ACPI_MEMSET(target_desc
->string
.pointer
, 0,
192 (acpi_size
) target_desc
->string
.length
+ 1);
193 ACPI_MEMCPY(target_desc
->string
.pointer
, buffer
, length
);
196 * Free the current buffer, then allocate a new buffer
197 * large enough to hold the value
199 if (target_desc
->string
.pointer
&&
200 (!(target_desc
->common
.flags
& AOPOBJ_STATIC_POINTER
))) {
202 /* Only free if not a pointer into the DSDT */
204 ACPI_FREE(target_desc
->string
.pointer
);
207 target_desc
->string
.pointer
= ACPI_ALLOCATE_ZEROED((acpi_size
)
209 if (!target_desc
->string
.pointer
) {
210 return_ACPI_STATUS(AE_NO_MEMORY
);
213 target_desc
->common
.flags
&= ~AOPOBJ_STATIC_POINTER
;
214 ACPI_MEMCPY(target_desc
->string
.pointer
, buffer
, length
);
217 /* Set the new target length */
219 target_desc
->string
.length
= length
;
220 return_ACPI_STATUS(AE_OK
);