boot/freeldr/freeldr/arch/i386/ntoskrnl.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            boot/freeldr/freeldr/arch/i386/ntoskrnl.c
   5  * PURPOSE:         NTOS glue routines for the MINIHAL library
   6  * PROGRAMMERS:     Hervé Poussineau  <hpoussin@reactos.org>
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12
  13 /* For KeStallExecutionProcessor */
  14 #if defined(_M_IX86) || defined(_M_AMD64)
  15 #include <arch/pc/pcbios.h>
  16 #endif
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 VOID
  21 NTAPI
  22 KeInitializeEvent(
  23     IN PRKEVENT Event,
  24     IN EVENT_TYPE Type,
  25     IN BOOLEAN State)
  26 {
  27     memset(Event, 0, sizeof(*Event));
  28 }
  29
  30 VOID
  31 FASTCALL
  32 KiAcquireSpinLock(
  33     IN PKSPIN_LOCK SpinLock)
  34 {
  35 }
  36
  37 VOID
  38 FASTCALL
  39 KiReleaseSpinLock(
  40     IN PKSPIN_LOCK SpinLock)
  41 {
  42 }
  43
  44 VOID
  45 NTAPI
  46 KeSetTimeIncrement(
  47     IN ULONG MaxIncrement,
  48     IN ULONG MinIncrement)
  49 {
  50 }
  51
  52 VOID
  53 FASTCALL
  54 IoAssignDriveLetters(
  55     IN struct _LOADER_PARAMETER_BLOCK *LoaderBlock,
  56     IN PSTRING NtDeviceName,
  57     OUT PUCHAR NtSystemPath,
  58     OUT PSTRING NtSystemPathString)
  59 {
  60 }
  61
  62 NTSTATUS
  63 FASTCALL
  64 IoSetPartitionInformation(
  65     IN PDEVICE_OBJECT DeviceObject,
  66     IN ULONG SectorSize,
  67     IN ULONG PartitionNumber,
  68     IN ULONG PartitionType)
  69 {
  70     return STATUS_NOT_IMPLEMENTED;
  71 }
  72
  73 /*
  74  * NTSTATUS
  75  * FASTCALL
  76  * IoReadPartitionTable(
  77  *     IN PDEVICE_OBJECT DeviceObject,
  78  *     IN ULONG SectorSize,
  79  *     IN BOOLEAN ReturnRecognizedPartitions,
  80  *     OUT PDRIVE_LAYOUT_INFORMATION *PartitionBuffer);
  81  *
  82  * See boot/freeldr/freeldr/disk/partition.c
  83  */
  84
  85 NTSTATUS
  86 FASTCALL
  87 IoWritePartitionTable(
  88     IN PDEVICE_OBJECT DeviceObject,
  89     IN ULONG SectorSize,
  90     IN ULONG SectorsPerTrack,
  91     IN ULONG NumberOfHeads,
  92     IN PDRIVE_LAYOUT_INFORMATION PartitionBuffer)
  93 {
  94     return STATUS_NOT_IMPLEMENTED;
  95 }
  96
  97 VOID
  98 NTAPI
  99 KeStallExecutionProcessor(
 100     IN ULONG MicroSeconds)
 101 {
 102 #if defined(_M_IX86) || defined(_M_AMD64)
 103     REGS Regs;
 104     ULONG usec_this;
 105
 106     // Int 15h AH=86h
 107     // BIOS - WAIT (AT,PS)
 108     //
 109     // AH = 86h
 110     // CX:DX = interval in microseconds
 111     // Return:
 112     // CF clear if successful (wait interval elapsed)
 113     // CF set on error or AH=83h wait already in progress
 114     // AH = status (see #00496)
 115
 116     // Note: The resolution of the wait period is 977 microseconds on
 117     // many systems because many BIOSes use the 1/1024 second fast
 118     // interrupt from the AT real-time clock chip which is available on INT 70;
 119     // because newer BIOSes may have much more precise timers available, it is
 120     // not possible to use this function accurately for very short delays unless
 121     // the precise behavior of the BIOS is known (or found through testing)
 122
 123     while (MicroSeconds)
 124     {
 125         usec_this = MicroSeconds;
 126
 127         if (usec_this > 4000000)
 128         {
 129             usec_this = 4000000;
 130         }
 131
 132         Regs.b.ah = 0x86;
 133         Regs.w.cx = usec_this >> 16;
 134         Regs.w.dx = usec_this & 0xffff;
 135         Int386(0x15, &Regs, &Regs);
 136
 137         MicroSeconds -= usec_this;
 138     }
 139 #else
 140     #error unimplemented
 141 #endif
 142 }