boot/freeldr/freeldr/arch/i386/hwapm.c

   1 /*
   2  * PROJECT:     FreeLoader
   3  * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
   4  * PURPOSE:     APM BIOS detection routines
   5  * COPYRIGHT:   Copyright 2004 Eric Kohl (eric.kohl@reactos.org)
   6  */
   7
   8 #include <freeldr.h>
   9
  10 #include <debug.h>
  11 DBG_DEFAULT_CHANNEL(HWDETECT);
  12
  13 static BOOLEAN
  14 FindApmBios(VOID)
  15 {
  16     REGS RegsIn, RegsOut;
  17
  18     /* APM BIOS - Installation check */
  19 #if defined(SARCH_PC98)
  20     RegsIn.w.ax = 0x9A00;
  21     RegsIn.w.bx = 0x0000;
  22     Int386(0x1F, &RegsIn, &RegsOut);
  23 #else
  24     RegsIn.w.ax = 0x5300;
  25     RegsIn.w.bx = 0x0000;
  26     Int386(0x15, &RegsIn, &RegsOut);
  27 #endif
  28     if (INT386_SUCCESS(RegsOut) && RegsOut.w.bx == 'PM')
  29     {
  30         TRACE("Found APM BIOS\n");
  31         TRACE("AH: %x\n", RegsOut.b.ah);
  32         TRACE("AL: %x\n", RegsOut.b.al);
  33         TRACE("BH: %x\n", RegsOut.b.bh);
  34         TRACE("BL: %x\n", RegsOut.b.bl);
  35         TRACE("CX: %x\n", RegsOut.w.cx);
  36
  37         return TRUE;
  38     }
  39
  40     TRACE("No APM BIOS found\n");
  41
  42     return FALSE;
  43 }
  44
  45 VOID
  46 DetectApmBios(PCONFIGURATION_COMPONENT_DATA SystemKey, ULONG *BusNumber)
  47 {
  48     PCONFIGURATION_COMPONENT_DATA BiosKey;
  49     PCM_PARTIAL_RESOURCE_LIST PartialResourceList;
  50     ULONG Size;
  51
  52     if (!FindApmBios())
  53         return;
  54
  55     Size = sizeof(CM_PARTIAL_RESOURCE_LIST) -
  56            sizeof(CM_PARTIAL_RESOURCE_DESCRIPTOR);
  57
  58     /* Set 'Configuration Data' value */
  59     PartialResourceList = FrLdrHeapAlloc(Size, TAG_HW_RESOURCE_LIST);
  60     if (PartialResourceList == NULL)
  61     {
  62         ERR("Failed to allocate resource descriptor\n");
  63         return;
  64     }
  65     RtlZeroMemory(PartialResourceList, Size);
  66     PartialResourceList->Version = 0;
  67     PartialResourceList->Revision = 0;
  68     PartialResourceList->Count = 0;
  69
  70     /* FIXME: Add configuration data */
  71
  72     /* Create new bus key */
  73     FldrCreateComponentKey(SystemKey,
  74                            AdapterClass,
  75                            MultiFunctionAdapter,
  76                            0,
  77                            0,
  78                            0xFFFFFFFF,
  79                            "APM",
  80                            PartialResourceList,
  81                            Size,
  82                            &BiosKey);
  83
  84     /* Increment bus number */
  85     (*BusNumber)++;
  86 }
  87
  88 /* EOF */