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 <debug.h>
  23
  24 BOOLEAN AcpiPresent = FALSE;
  25
  26 static BOOLEAN
  27 FindAcpiBios(VOID)
  28 {
  29     PUCHAR Ptr;
  30
  31     /* Find the 'Root System Descriptor Table Pointer' */
  32     Ptr = (PUCHAR)0xE0000;
  33     while ((ULONG)Ptr < 0x100000)
  34     {
  35         if (!memcmp(Ptr, "RSD PTR ", 8))
  36         {
  37             DbgPrint((DPRINT_HWDETECT, "ACPI supported\n"));
  38
  39             return TRUE;
  40         }
  41
  42         Ptr = (PUCHAR)((ULONG)Ptr + 0x10);
  43     }
  44
  45     DbgPrint((DPRINT_HWDETECT, "ACPI not supported\n"));
  46
  47     return FALSE;
  48 }
  49
  50
  51 VOID
  52 DetectAcpiBios(PCONFIGURATION_COMPONENT_DATA SystemKey, ULONG *BusNumber)
  53 {
  54     PCONFIGURATION_COMPONENT_DATA BiosKey;
  55     CM_PARTIAL_RESOURCE_LIST PartialResourceList;
  56
  57     if (FindAcpiBios())
  58     {
  59         AcpiPresent = TRUE;
  60
  61         /* Create new bus key */
  62         FldrCreateComponentKey(SystemKey,
  63                                L"MultifunctionAdapter",
  64                                *BusNumber,
  65                                AdapterClass,
  66                                MultiFunctionAdapter,
  67                                &BiosKey);
  68
  69         /* Set 'Component Information' */
  70         FldrSetComponentInformation(BiosKey,
  71                                     0x0,
  72                                     0x0,
  73                                     0xFFFFFFFF);
  74
  75         /* Set 'Configuration Data' value */
  76         memset(&PartialResourceList, 0, sizeof(CM_PARTIAL_RESOURCE_LIST));
  77         PartialResourceList.Version = 0;
  78         PartialResourceList.Revision = 0;
  79         PartialResourceList.Count = 0;
  80         FldrSetConfigurationData(BiosKey,
  81                                  &PartialResourceList,
  82                                  sizeof(CM_PARTIAL_RESOURCE_LIST) -
  83                                  sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR));
  84
  85         /* Increment bus number */
  86         (*BusNumber)++;
  87
  88         /* Set 'Identifier' value */
  89         FldrSetIdentifier(BiosKey, L"ACPI BIOS");
  90     }
  91
  92     /* FIXME: Add congiguration data */
  93 }
  94
  95 /* EOF */