89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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i386init.c
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Abstract:
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This module contains code to manipulate i386 hardware structures used
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only by the kernel.
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Author:
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Bryan Willman 22 Feb 90
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Revision History:
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--*/
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#include "ki.h"
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VOID
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KiInitializeMachineType (
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VOID
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);
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#pragma alloc_text(INIT,KiInitializeMachineType)
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KIRQL KiProfileIrql = PROFILE_LEVEL;
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ULONG KeI386MachineType = 0;
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BOOLEAN KeI386NpxPresent;
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BOOLEAN KeI386FxsrPresent;
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ULONG KeI386ForceNpxEmulation;
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ULONG KiMXCsrMask;
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ULONG KeI386CpuType;
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ULONG KeI386CpuStep;
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PVOID Ki387RoundModeTable; // R3 emulators RoundingMode vector table
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ULONG KiBootFeatureBits;
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ULONG KiInBiosCall = FALSE;
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ULONG FlagState = 0; // bios calls shouldn't automatically turn interrupts back on.
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KTRAP_FRAME KiBiosFrame;
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#if DBG
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UCHAR MsgDpcTrashedEsp[] = "\n*** DPC routine %lx trashed ESP\n";
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UCHAR MsgDpcTimeout[] = "\n*** DPC routine > 1 sec --- This is not a break in KeUpdateSystemTime\n";
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UCHAR MsgISRTimeout[] = "\n*** ISR at %lx took over .5 second\n";
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ULONG KiDPCTimeout = 110;
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ULONG KiISRTimeout = 55;
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ULONG KiSpinlockTimeout = 55;
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#endif
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UCHAR MsgISROverflow[] = "\n*** ISR at %lx appears to have an interrupt storm\n";
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USHORT KiISROverflow = 30000;
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VOID
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KiInitializeMachineType (
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VOID
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)
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/*++
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Routine Description:
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This function initializes machine type, i.e. MCA, ABIOS, ISA
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or EISA.
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N.B. This is a temporary routine. machine type:
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Byte 0 - Machine Type, ISA, EISA or MCA
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Byte 1 - CPU type, i386 or i486
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Byte 2 - Cpu Step, A or B ... etc.
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Highest bit indicates if NPX is present.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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KeI386MachineType = KeLoaderBlock->u.I386.MachineType & 0x000ff;
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}
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