arch/all-pc/acpica/source/components/resources/rslist.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rslist - Linked list utilities
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 #define __RSLIST_C__
  45
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acresrc.h"
  49
  50 #define _COMPONENT          ACPI_RESOURCES
  51         ACPI_MODULE_NAME    ("rslist")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    AcpiRsConvertAmlToResources
  57  *
  58  * PARAMETERS:  ACPI_WALK_AML_CALLBACK
  59  *              ResourcePtr             - Pointer to the buffer that will
  60  *                                        contain the output structures
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Convert an AML resource to an internal representation of the
  65  *              resource that is aligned and easier to access.
  66  *
  67  ******************************************************************************/
  68
  69 ACPI_STATUS
  70 AcpiRsConvertAmlToResources (
  71     UINT8                   *Aml,
  72     UINT32                  Length,
  73     UINT32                  Offset,
  74     UINT8                   ResourceIndex,
  75     void                    **Context)
  76 {
  77     ACPI_RESOURCE           **ResourcePtr = ACPI_CAST_INDIRECT_PTR (
  78                                 ACPI_RESOURCE, Context);
  79     ACPI_RESOURCE           *Resource;
  80     AML_RESOURCE            *AmlResource;
  81     ACPI_RSCONVERT_INFO     *ConversionTable;
  82     ACPI_STATUS             Status;
  83
  84
  85     ACPI_FUNCTION_TRACE (RsConvertAmlToResources);
  86
  87
  88     /*
  89      * Check that the input buffer and all subsequent pointers into it
  90      * are aligned on a native word boundary. Most important on IA64
  91      */
  92     Resource = *ResourcePtr;
  93     if (ACPI_IS_MISALIGNED (Resource))
  94     {
  95         ACPI_WARNING ((AE_INFO,
  96             "Misaligned resource pointer %p", Resource));
  97     }
  98
  99     /* Get the appropriate conversion info table */
 100
 101     AmlResource = ACPI_CAST_PTR (AML_RESOURCE, Aml);
 102     if (AcpiUtGetResourceType (Aml) == ACPI_RESOURCE_NAME_SERIAL_BUS)
 103     {
 104         if (AmlResource->CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE)
 105         {
 106             ConversionTable = NULL;
 107         }
 108         else
 109         {
 110             /* This is an I2C, SPI, or UART SerialBus descriptor */
 111
 112             ConversionTable =
 113                 AcpiGbl_ConvertResourceSerialBusDispatch[
 114                     AmlResource->CommonSerialBus.Type];
 115         }
 116     }
 117     else
 118     {
 119         ConversionTable =
 120             AcpiGbl_GetResourceDispatch[ResourceIndex];
 121     }
 122
 123     if (!ConversionTable)
 124     {
 125         ACPI_ERROR ((AE_INFO,
 126             "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 127             ResourceIndex));
 128         return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
 129     }
 130
 131      /* Convert the AML byte stream resource to a local resource struct */
 132
 133     Status = AcpiRsConvertAmlToResource (
 134         Resource, AmlResource, ConversionTable);
 135     if (ACPI_FAILURE (Status))
 136     {
 137         ACPI_EXCEPTION ((AE_INFO, Status,
 138             "Could not convert AML resource (Type 0x%X)", *Aml));
 139         return_ACPI_STATUS (Status);
 140     }
 141
 142     ACPI_DEBUG_PRINT ((ACPI_DB_RESOURCES,
 143         "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
 144         AcpiUtGetResourceType (Aml), Length,
 145         Resource->Length));
 146
 147     /* Point to the next structure in the output buffer */
 148
 149     *ResourcePtr = ACPI_NEXT_RESOURCE (Resource);
 150     return_ACPI_STATUS (AE_OK);
 151 }
 152
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    AcpiRsConvertResourcesToAml
 157  *
 158  * PARAMETERS:  Resource            - Pointer to the resource linked list
 159  *              AmlSizeNeeded       - Calculated size of the byte stream
 160  *                                    needed from calling AcpiRsGetAmlLength()
 161  *                                    The size of the OutputBuffer is
 162  *                                    guaranteed to be >= AmlSizeNeeded
 163  *              OutputBuffer        - Pointer to the buffer that will
 164  *                                    contain the byte stream
 165  *
 166  * RETURN:      Status
 167  *
 168  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 169  *              byte stream of resources in the caller's output buffer
 170  *
 171  ******************************************************************************/
 172
 173 ACPI_STATUS
 174 AcpiRsConvertResourcesToAml (
 175     ACPI_RESOURCE           *Resource,
 176     ACPI_SIZE               AmlSizeNeeded,
 177     UINT8                   *OutputBuffer)
 178 {
 179     UINT8                   *Aml = OutputBuffer;
 180     UINT8                   *EndAml = OutputBuffer + AmlSizeNeeded;
 181     ACPI_RSCONVERT_INFO     *ConversionTable;
 182     ACPI_STATUS             Status;
 183
 184
 185     ACPI_FUNCTION_TRACE (RsConvertResourcesToAml);
 186
 187
 188     /* Walk the resource descriptor list, convert each descriptor */
 189
 190     while (Aml < EndAml)
 191     {
 192         /* Validate the (internal) Resource Type */
 193
 194         if (Resource->Type > ACPI_RESOURCE_TYPE_MAX)
 195         {
 196             ACPI_ERROR ((AE_INFO,
 197                 "Invalid descriptor type (0x%X) in resource list",
 198                 Resource->Type));
 199             return_ACPI_STATUS (AE_BAD_DATA);
 200         }
 201
 202         /* Sanity check the length. It must not be zero, or we loop forever */
 203
 204         if (!Resource->Length)
 205         {
 206             ACPI_ERROR ((AE_INFO,
 207                 "Invalid zero length descriptor in resource list\n"));
 208             return_ACPI_STATUS (AE_AML_BAD_RESOURCE_LENGTH);
 209         }
 210
 211         /* Perform the conversion */
 212
 213         if (Resource->Type == ACPI_RESOURCE_TYPE_SERIAL_BUS)
 214         {
 215             if (Resource->Data.CommonSerialBus.Type > AML_RESOURCE_MAX_SERIALBUSTYPE)
 216             {
 217                 ConversionTable = NULL;
 218             }
 219             else
 220             {
 221                 /* This is an I2C, SPI, or UART SerialBus descriptor */
 222
 223                 ConversionTable = AcpiGbl_ConvertResourceSerialBusDispatch[
 224                     Resource->Data.CommonSerialBus.Type];
 225             }
 226         }
 227         else
 228         {
 229             ConversionTable = AcpiGbl_SetResourceDispatch[Resource->Type];
 230         }
 231
 232         if (!ConversionTable)
 233         {
 234             ACPI_ERROR ((AE_INFO,
 235                 "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 236                 Resource->Type));
 237             return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
 238         }
 239
 240         Status = AcpiRsConvertResourceToAml (Resource,
 241                 ACPI_CAST_PTR (AML_RESOURCE, Aml),
 242                 ConversionTable);
 243         if (ACPI_FAILURE (Status))
 244         {
 245             ACPI_EXCEPTION ((AE_INFO, Status,
 246                 "Could not convert resource (type 0x%X) to AML",
 247                 Resource->Type));
 248             return_ACPI_STATUS (Status);
 249         }
 250
 251         /* Perform final sanity check on the new AML resource descriptor */
 252
 253         Status = AcpiUtValidateResource (NULL,
 254                     ACPI_CAST_PTR (AML_RESOURCE, Aml), NULL);
 255         if (ACPI_FAILURE (Status))
 256         {
 257             return_ACPI_STATUS (Status);
 258         }
 259
 260         /* Check for end-of-list, normal exit */
 261
 262         if (Resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
 263         {
 264             /* An End Tag indicates the end of the input Resource Template */
 265
 266             return_ACPI_STATUS (AE_OK);
 267         }
 268
 269         /*
 270          * Extract the total length of the new descriptor and set the
 271          * Aml to point to the next (output) resource descriptor
 272          */
 273         Aml += AcpiUtGetDescriptorLength (Aml);
 274
 275         /* Point to the next input resource descriptor */
 276
 277         Resource = ACPI_NEXT_RESOURCE (Resource);
 278     }
 279
 280     /* Completed buffer, but did not find an EndTag resource descriptor */
 281
 282     return_ACPI_STATUS (AE_AML_NO_RESOURCE_END_TAG);
 283 }