reactos/boot/freeldr/freeldr/arch/i386/hwacpi.c

   1 /*
   2  *  FreeLoader
   3  *
   4  *  Copyright (C) 2004  Eric Kohl
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <freeldr.h>
  22
  23 #define NDEBUG
  24 #include <debug.h>
  25
  26 BOOLEAN AcpiPresent = FALSE;
  27
  28 static BOOL
  29 FindAcpiBios(VOID)
  30 {
  31   PUCHAR Ptr;
  32
  33   /* Find the 'Root System Descriptor Table Pointer' */
  34   Ptr = (PUCHAR)0xE0000;
  35   while ((ULONG)Ptr < 0x100000)
  36     {
  37       if (!memcmp(Ptr, "RSD PTR ", 8))
  38         {
  39           DbgPrint((DPRINT_HWDETECT, "ACPI supported\n"));
  40
  41           return TRUE;
  42         }
  43
  44       Ptr = (PUCHAR)((ULONG)Ptr + 0x10);
  45     }
  46
  47   DbgPrint((DPRINT_HWDETECT, "ACPI not supported\n"));
  48
  49   return FALSE;
  50 }
  51
  52
  53 VOID
  54 DetectAcpiBios(FRLDRHKEY SystemKey, ULONG *BusNumber)
  55 {
  56   WCHAR Buffer[80];
  57   FRLDRHKEY BiosKey;
  58   LONG Error;
  59
  60   if (FindAcpiBios())
  61     {
  62       AcpiPresent = TRUE;
  63       /* Create new bus key */
  64       swprintf(Buffer,
  65               L"MultifunctionAdapter\\%u", *BusNumber);
  66       Error = RegCreateKey(SystemKey,
  67                            Buffer,
  68                            &BiosKey);
  69       if (Error != ERROR_SUCCESS)
  70         {
  71           DbgPrint((DPRINT_HWDETECT, "RegCreateKey() failed (Error %u)\n", (int)Error));
  72           return;
  73         }
  74
  75 #if 0
  76       /* Set 'Component Information' */
  77       SetComponentInformation(BiosKey,
  78                               0x0,
  79                               0x0,
  80                               0xFFFFFFFF);
  81 #endif
  82
  83       /* Increment bus number */
  84       (*BusNumber)++;
  85
  86       /* Set 'Identifier' value */
  87       Error = RegSetValue(BiosKey,
  88                           L"Identifier",
  89                           REG_SZ,
  90                           (PCHAR)L"ACPI BIOS",
  91                           10 * sizeof(WCHAR));
  92       if (Error != ERROR_SUCCESS)
  93         {
  94           DbgPrint((DPRINT_HWDETECT, "RegSetValue() failed (Error %u)\n", (int)Error));
  95           return;
  96         }
  97
  98     }
  99 }
 100
 101 /* EOF */