exstorob.c revision 231844 
1
2/******************************************************************************
3 *
4 * Module Name: exstorob - AML Interpreter object store support, store to object
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, Intel Corp.
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#define __EXSTOROB_C__
46
47#include <contrib/dev/acpica/include/acpi.h>
48#include <contrib/dev/acpica/include/accommon.h>
49#include <contrib/dev/acpica/include/acinterp.h>
50
51
52#define _COMPONENT          ACPI_EXECUTER
53        ACPI_MODULE_NAME    ("exstorob")
54
55
56/*******************************************************************************
57 *
58 * FUNCTION:    AcpiExStoreBufferToBuffer
59 *
60 * PARAMETERS:  SourceDesc          - Source object to copy
61 *              TargetDesc          - Destination object of the copy
62 *
63 * RETURN:      Status
64 *
65 * DESCRIPTION: Copy a buffer object to another buffer object.
66 *
67 ******************************************************************************/
68
69ACPI_STATUS
70AcpiExStoreBufferToBuffer (
71    ACPI_OPERAND_OBJECT     *SourceDesc,
72    ACPI_OPERAND_OBJECT     *TargetDesc)
73{
74    UINT32                  Length;
75    UINT8                   *Buffer;
76
77
78    ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
79
80
81    /* If Source and Target are the same, just return */
82
83    if (SourceDesc == TargetDesc)
84    {
85        return_ACPI_STATUS (AE_OK);
86    }
87
88    /* We know that SourceDesc is a buffer by now */
89
90    Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
91    Length = SourceDesc->Buffer.Length;
92
93    /*
94     * If target is a buffer of length zero or is a static buffer,
95     * allocate a new buffer of the proper length
96     */
97    if ((TargetDesc->Buffer.Length == 0) ||
98        (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
99    {
100        TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
101        if (!TargetDesc->Buffer.Pointer)
102        {
103            return_ACPI_STATUS (AE_NO_MEMORY);
104        }
105
106        TargetDesc->Buffer.Length = Length;
107    }
108
109    /* Copy source buffer to target buffer */
110
111    if (Length <= TargetDesc->Buffer.Length)
112    {
113        /* Clear existing buffer and copy in the new one */
114
115        ACPI_MEMSET (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
116        ACPI_MEMCPY (TargetDesc->Buffer.Pointer, Buffer, Length);
117
118#ifdef ACPI_OBSOLETE_BEHAVIOR
119        /*
120         * NOTE: ACPI versions up to 3.0 specified that the buffer must be
121         * truncated if the string is smaller than the buffer.  However, "other"
122         * implementations of ACPI never did this and thus became the defacto
123         * standard. ACPI 3.0A changes this behavior such that the buffer
124         * is no longer truncated.
125         */
126
127        /*
128         * OBSOLETE BEHAVIOR:
129         * If the original source was a string, we must truncate the buffer,
130         * according to the ACPI spec.  Integer-to-Buffer and Buffer-to-Buffer
131         * copy must not truncate the original buffer.
132         */
133        if (OriginalSrcType == ACPI_TYPE_STRING)
134        {
135            /* Set the new length of the target */
136
137            TargetDesc->Buffer.Length = Length;
138        }
139#endif
140    }
141    else
142    {
143        /* Truncate the source, copy only what will fit */
144
145        ACPI_MEMCPY (TargetDesc->Buffer.Pointer, Buffer,
146            TargetDesc->Buffer.Length);
147
148        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
149            "Truncating source buffer from %X to %X\n",
150            Length, TargetDesc->Buffer.Length));
151    }
152
153    /* Copy flags */
154
155    TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
156    TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
157    return_ACPI_STATUS (AE_OK);
158}
159
160
161/*******************************************************************************
162 *
163 * FUNCTION:    AcpiExStoreStringToString
164 *
165 * PARAMETERS:  SourceDesc          - Source object to copy
166 *              TargetDesc          - Destination object of the copy
167 *
168 * RETURN:      Status
169 *
170 * DESCRIPTION: Copy a String object to another String object
171 *
172 ******************************************************************************/
173
174ACPI_STATUS
175AcpiExStoreStringToString (
176    ACPI_OPERAND_OBJECT     *SourceDesc,
177    ACPI_OPERAND_OBJECT     *TargetDesc)
178{
179    UINT32                  Length;
180    UINT8                   *Buffer;
181
182
183    ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
184
185
186    /* If Source and Target are the same, just return */
187
188    if (SourceDesc == TargetDesc)
189    {
190        return_ACPI_STATUS (AE_OK);
191    }
192
193    /* We know that SourceDesc is a string by now */
194
195    Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
196    Length = SourceDesc->String.Length;
197
198    /*
199     * Replace existing string value if it will fit and the string
200     * pointer is not a static pointer (part of an ACPI table)
201     */
202    if ((Length < TargetDesc->String.Length) &&
203       (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
204    {
205        /*
206         * String will fit in existing non-static buffer.
207         * Clear old string and copy in the new one
208         */
209        ACPI_MEMSET (TargetDesc->String.Pointer, 0,
210            (ACPI_SIZE) TargetDesc->String.Length + 1);
211        ACPI_MEMCPY (TargetDesc->String.Pointer, Buffer, Length);
212    }
213    else
214    {
215        /*
216         * Free the current buffer, then allocate a new buffer
217         * large enough to hold the value
218         */
219        if (TargetDesc->String.Pointer &&
220           (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
221        {
222            /* Only free if not a pointer into the DSDT */
223
224            ACPI_FREE (TargetDesc->String.Pointer);
225        }
226
227        TargetDesc->String.Pointer = ACPI_ALLOCATE_ZEROED (
228                                        (ACPI_SIZE) Length + 1);
229        if (!TargetDesc->String.Pointer)
230        {
231            return_ACPI_STATUS (AE_NO_MEMORY);
232        }
233
234        TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
235        ACPI_MEMCPY (TargetDesc->String.Pointer, Buffer, Length);
236    }
237
238    /* Set the new target length */
239
240    TargetDesc->String.Length = Length;
241    return_ACPI_STATUS (AE_OK);
242}
243
244
245