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 #include <arch.h>
  23 #include <rtl.h>
  24 #include <debug.h>
  25 #include <mm.h>
  26 #include <portio.h>
  27
  28 #include "../../reactos/registry.h"
  29 #include "hardware.h"
  30
  31 BOOLEAN AcpiPresent = FALSE;
  32
  33 static BOOL
  34 FindAcpiBios(VOID)
  35 {
  36   PUCHAR Ptr;
  37
  38   /* Find the 'Root System Descriptor Table Pointer' */
  39   Ptr = (PUCHAR)0xE0000;
  40   while ((ULONG)Ptr < 0x100000)
  41     {
  42       if (!memcmp(Ptr, "RSD PTR ", 8))
  43         {
  44           DbgPrint((DPRINT_HWDETECT, "ACPI supported\n"));
  45
  46           return TRUE;
  47         }
  48
  49       Ptr = (PUCHAR)((ULONG)Ptr + 0x10);
  50     }
  51
  52   DbgPrint((DPRINT_HWDETECT, "ACPI not supported\n"));
  53
  54   return FALSE;
  55 }
  56
  57
  58 VOID
  59 DetectAcpiBios(FRLDRHKEY SystemKey, ULONG *BusNumber)
  60 {
  61   char Buffer[80];
  62   FRLDRHKEY BiosKey;
  63   LONG Error;
  64
  65   if (FindAcpiBios())
  66     {
  67       AcpiPresent = TRUE;
  68       /* Create new bus key */
  69       sprintf(Buffer,
  70               "MultifunctionAdapter\\%u", *BusNumber);
  71       Error = RegCreateKey(SystemKey,
  72                            Buffer,
  73                            &BiosKey);
  74       if (Error != ERROR_SUCCESS)
  75         {
  76           DbgPrint((DPRINT_HWDETECT, "RegCreateKey() failed (Error %u)\n", (int)Error));
  77           return;
  78         }
  79
  80 #if 0
  81       /* Set 'Component Information' */
  82       SetComponentInformation(BiosKey,
  83                               0x0,
  84                               0x0,
  85                               0xFFFFFFFF);
  86 #endif
  87
  88       /* Increment bus number */
  89       (*BusNumber)++;
  90
  91       /* Set 'Identifier' value */
  92       Error = RegSetValue(BiosKey,
  93                           "Identifier",
  94                           REG_SZ,
  95                           (PUCHAR)"ACPI BIOS",
  96                           10);
  97       if (Error != ERROR_SUCCESS)
  98         {
  99           DbgPrint((DPRINT_HWDETECT, "RegSetValue() failed (Error %u)\n", (int)Error));
 100           return;
 101         }
 102
 103     }
 104 }
 105
 106 /* EOF */