src/add-ons/kernel/bus_managers/acpi/SmallResourceData.cpp

   1 /*
   2  * Copyright 2009, Haiku, Inc. All Rights Reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Clemens Zeidler, haiku@clemens-zeidler.de
   7  */
   8
   9 #include "SmallResourceData.h"
  10
  11 #include <stdlib.h>
  12
  13 //#define TRACE_SMALLRESOURCEDATA
  14 #ifdef TRACE_SMALLRESOURCEDATA
  15 #       define TRACE(x...) dprintf("Small Resource Data: "x)
  16 #else
  17 #       define TRACE(x...)
  18 #endif
  19
  20
  21 void
  22 io_port::Print()
  23 {
  24         dprintf("io_port:\n");
  25         int i = (deviceAddresses16Bit ? 1 : 0);
  26         dprintf("deviceAddresses16Bit %i\n", i);
  27         dprintf("minimumBase %i\n", minimumBase);
  28         dprintf("maximumBase %i\n", maximumBase);
  29         dprintf("minimumBaseAlignment %i\n", minimumBaseAlignment);
  30         dprintf("contigiuousIOPorts %i\n", contigiuousIOPorts);
  31 }
  32
  33
  34 SmallResourceData::SmallResourceData(acpi_device_module_info* acpi,
  35         acpi_device acpiCookie, const char* method)
  36 {
  37         acpi_data buffer;
  38         buffer.pointer = NULL;
  39         buffer.length = ACPI_ALLOCATE_BUFFER;
  40
  41         fStatus = acpi->evaluate_method(acpiCookie, method, NULL, &buffer);
  42
  43         if (fStatus != B_OK)
  44                 return;
  45
  46         fBuffer = (acpi_object_type*)buffer.pointer;
  47
  48         if (fBuffer[0].object_type != ACPI_TYPE_BUFFER) {
  49                 fStatus = B_ERROR;
  50                 return;
  51         }
  52
  53         fResourcePointer = (int8*)fBuffer[0].data.buffer.buffer;
  54         fBufferSize = fBuffer[0].data.buffer.length;
  55         fRemainingBufferSize = fBufferSize;
  56
  57         // ToDo: Check checksum of the endtag. The sum of all databytes + checksum
  58         // is zero. See section 6.4.2.8.
  59 }
  60
  61
  62 SmallResourceData::~SmallResourceData()
  63 {
  64         if (InitCheck() == B_OK)
  65                 free(fBuffer);
  66 }
  67
  68
  69 status_t
  70 SmallResourceData::InitCheck()
  71 {
  72         return fStatus;
  73 }
  74
  75
  76 int8
  77 SmallResourceData::GetType()
  78 {
  79         return *fResourcePointer;
  80 }
  81
  82
  83 status_t
  84 SmallResourceData::ReadIOPort(io_port* ioPort)
  85 {
  86         const size_t packageSize = 8;
  87
  88         if (fRemainingBufferSize < packageSize)
  89                 return B_ERROR;
  90         if (fResourcePointer[0] != kIOPort)
  91                 return B_ERROR;
  92
  93         ioPort->deviceAddresses16Bit = (fResourcePointer[1] == 1);
  94
  95         int16 tmp;
  96         tmp = fResourcePointer[3];
  97         tmp = tmp << 8;
  98         tmp |= fResourcePointer[2];
  99         ioPort->minimumBase = tmp;
 100
 101         tmp = fResourcePointer[5];
 102         tmp = tmp << 8;
 103         tmp |= fResourcePointer[4];
 104         ioPort->maximumBase = tmp;
 105
 106         ioPort->minimumBaseAlignment = fResourcePointer[6];
 107         ioPort->contigiuousIOPorts = fResourcePointer[7];
 108
 109         fResourcePointer += packageSize;
 110         fRemainingBufferSize -= packageSize;
 111         TRACE("SmallResourceData: remaining buffer size %i\n",
 112                 int(fRemainingBufferSize));
 113         return B_OK;
 114 }