drivers/acpi/executer/exstorob.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exstorob - AML Interpreter object store support, store to object
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2004, 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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acinterp.h>
  48
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51          ACPI_MODULE_NAME    ("exstorob")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_store_buffer_to_buffer
  57  *
  58  * PARAMETERS:  source_desc         - Source object to copy
  59  *              target_desc         - Destination object of the copy
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Copy a buffer object to another buffer object.
  64  *
  65  ******************************************************************************/
  66
  67 acpi_status
  68 acpi_ex_store_buffer_to_buffer (
  69         union acpi_operand_object       *source_desc,
  70         union acpi_operand_object       *target_desc)
  71 {
  72         u32                             length;
  73         u8                              *buffer;
  74
  75
  76         ACPI_FUNCTION_TRACE_PTR ("ex_store_buffer_to_buffer", source_desc);
  77
  78
  79         /*
  80          * We know that source_desc is a buffer by now
  81          */
  82         buffer = (u8 *) source_desc->buffer.pointer;
  83         length = source_desc->buffer.length;
  84
  85         /*
  86          * If target is a buffer of length zero or is a static buffer,
  87          * allocate a new buffer of the proper length
  88          */
  89         if ((target_desc->buffer.length == 0) ||
  90                 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
  91                 target_desc->buffer.pointer = ACPI_MEM_ALLOCATE (length);
  92                 if (!target_desc->buffer.pointer) {
  93                         return_ACPI_STATUS (AE_NO_MEMORY);
  94                 }
  95
  96                 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
  97                 target_desc->buffer.length = length;
  98         }
  99
 100         /*
 101          * Buffer is a static allocation,
 102          * only place what will fit in the buffer.
 103          */
 104         if (length <= target_desc->buffer.length) {
 105                 /* Clear existing buffer and copy in the new one */
 106
 107                 ACPI_MEMSET (target_desc->buffer.pointer, 0, target_desc->buffer.length);
 108                 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, length);
 109         }
 110         else {
 111                 /*
 112                  * Truncate the source, copy only what will fit
 113                  */
 114                 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, target_desc->buffer.length);
 115
 116                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 117                         "Truncating src buffer from %X to %X\n",
 118                         length, target_desc->buffer.length));
 119         }
 120
 121         /* Copy flags */
 122
 123         target_desc->buffer.flags = source_desc->buffer.flags;
 124         return_ACPI_STATUS (AE_OK);
 125 }
 126
 127
 128 /*******************************************************************************
 129  *
 130  * FUNCTION:    acpi_ex_store_string_to_string
 131  *
 132  * PARAMETERS:  source_desc         - Source object to copy
 133  *              target_desc         - Destination object of the copy
 134  *
 135  * RETURN:      Status
 136  *
 137  * DESCRIPTION: Copy a String object to another String object
 138  *
 139  ******************************************************************************/
 140
 141 acpi_status
 142 acpi_ex_store_string_to_string (
 143         union acpi_operand_object       *source_desc,
 144         union acpi_operand_object       *target_desc)
 145 {
 146         u32                             length;
 147         u8                              *buffer;
 148
 149
 150         ACPI_FUNCTION_TRACE_PTR ("ex_store_string_to_string", source_desc);
 151
 152
 153         /*
 154          * We know that source_desc is a string by now.
 155          */
 156         buffer = (u8 *) source_desc->string.pointer;
 157         length = source_desc->string.length;
 158
 159         /*
 160          * Replace existing string value if it will fit and the string
 161          * pointer is not a static pointer (part of an ACPI table)
 162          */
 163         if ((length < target_desc->string.length) &&
 164            (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
 165                 /*
 166                  * String will fit in existing non-static buffer.
 167                  * Clear old string and copy in the new one
 168                  */
 169                 ACPI_MEMSET (target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1);
 170                 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
 171         }
 172         else {
 173                 /*
 174                  * Free the current buffer, then allocate a new buffer
 175                  * large enough to hold the value
 176                  */
 177                 if (target_desc->string.pointer &&
 178                    (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
 179                         /*
 180                          * Only free if not a pointer into the DSDT
 181                          */
 182                         ACPI_MEM_FREE (target_desc->string.pointer);
 183                 }
 184
 185                 target_desc->string.pointer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1);
 186                 if (!target_desc->string.pointer) {
 187                         return_ACPI_STATUS (AE_NO_MEMORY);
 188                 }
 189
 190                 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 191                 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
 192         }
 193
 194         /* Set the new target length */
 195
 196         target_desc->string.length = length;
 197         return_ACPI_STATUS (AE_OK);
 198 }
 199
 200