intrin_i.h File Reference

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Macros
#define	Ke386GetGlobalDescriptorTable   __sgdt
#define	Ke386SetGlobalDescriptorTable   __lgdt
#define	Ke386GetLocalDescriptorTable   __sldt

Functions
FORCEINLINE PKGDTENTRY	KiGetGdtEntry (_In_ PVOID pGdt, _In_ USHORT Selector)
FORCEINLINE VOID	KiSetGdtDescriptorBase (_Inout_ PKGDTENTRY Entry, _In_ ULONG32 Base)
FORCEINLINE VOID	KiSetGdtDescriptorLimit (_Inout_ PKGDTENTRY Entry, _In_ ULONG Limit)
FORCEINLINE VOID	KiSetGdtEntryEx (_Inout_ PKGDTENTRY Entry, _In_ ULONG32 Base, _In_ ULONG Limit, _In_ UCHAR Type, _In_ UCHAR Dpl, _In_ BOOLEAN Granularity, _In_ UCHAR SegMode)
FORCEINLINE VOID	KiSetGdtEntry (_Inout_ PKGDTENTRY Entry, _In_ ULONG32 Base, _In_ ULONG Limit, _In_ UCHAR Type, _In_ UCHAR Dpl, _In_ UCHAR SegMode)

Macro Definition Documentation

Ke386GetGlobalDescriptorTable

#define Ke386GetGlobalDescriptorTable   __sgdt

Definition at line 452 of file intrin_i.h.

Ke386GetLocalDescriptorTable

#define Ke386GetLocalDescriptorTable   __sldt

Definition at line 454 of file intrin_i.h.

Ke386SetGlobalDescriptorTable

#define Ke386SetGlobalDescriptorTable   __lgdt

Definition at line 453 of file intrin_i.h.

Function Documentation

KiGetGdtEntry()

FORCEINLINE PKGDTENTRY KiGetGdtEntry	(	_In_ PVOID	pGdt,
		_In_ USHORT	Selector
	)

Definition at line 10 of file intrin_i.h.

{
    return (PKGDTENTRY)((ULONG_PTR)pGdt + (Selector & ~RPL_MASK));
}

KiSetGdtDescriptorBase()

FORCEINLINE VOID KiSetGdtDescriptorBase	(	_Inout_ PKGDTENTRY	Entry,
		_In_ ULONG32	Base
	)

Definition at line 19 of file intrin_i.h.

{
    Entry->BaseLow = (USHORT)(Base & 0xffff);
    Entry->HighWord.Bytes.BaseMid = (UCHAR)((Base >> 16) & 0xff);
    Entry->HighWord.Bytes.BaseHi  = (UCHAR)((Base >> 24) & 0xff);
    // Entry->BaseUpper = (ULONG)(Base >> 32);
}

KiSetGdtDescriptorLimit()

FORCEINLINE VOID KiSetGdtDescriptorLimit	(	_Inout_ PKGDTENTRY	Entry,
		_In_ ULONG	Limit
	)

Definition at line 31 of file intrin_i.h.

{
    if (Limit < 0x100000)
    {
        Entry->HighWord.Bits.Granularity = 0;
    }
    else
    {
        Limit >>= 12;
        Entry->HighWord.Bits.Granularity = 1;
    }
    Entry->LimitLow = (USHORT)(Limit & 0xffff);
    Entry->HighWord.Bits.LimitHi = ((Limit >> 16) & 0x0f);
}

KiSetGdtEntry()

FORCEINLINE VOID KiSetGdtEntry	(	_Inout_ PKGDTENTRY	Entry,
		_In_ ULONG32	Base,
		_In_ ULONG	Limit,
		_In_ UCHAR	Type,
		_In_ UCHAR	Dpl,
		_In_ UCHAR	SegMode
	)

Definition at line 73 of file intrin_i.h.

{
    KiSetGdtEntryEx(Entry, Base, Limit, Type, Dpl, FALSE, SegMode);
}

Referenced by WinLdrSetProcessorContext().

KiSetGdtEntryEx()

FORCEINLINE VOID KiSetGdtEntryEx	(	_Inout_ PKGDTENTRY	Entry,
		_In_ ULONG32	Base,
		_In_ ULONG	Limit,
		_In_ UCHAR	Type,
		_In_ UCHAR	Dpl,
		_In_ BOOLEAN	Granularity,
		_In_ UCHAR	SegMode
	)

Definition at line 50 of file intrin_i.h.

{
    KiSetGdtDescriptorBase(Entry, Base);
    KiSetGdtDescriptorLimit(Entry, Limit);
    Entry->HighWord.Bits.Type = (Type & 0x1f);
    Entry->HighWord.Bits.Dpl  = (Dpl & 0x3);
    Entry->HighWord.Bits.Pres = (Type != 0); // Present, must be 1 when the GDT entry is valid.
    Entry->HighWord.Bits.Sys  = 0;           // System
    Entry->HighWord.Bits.Reserved_0  = 0;    // LongMode = !!(SegMode & 1);
    Entry->HighWord.Bits.Default_Big = !!(SegMode & 2);
    Entry->HighWord.Bits.Granularity |= !!Granularity; // The flag may have been already set by KiSetGdtDescriptorLimit().
    // Entry->MustBeZero = 0;
}

Referenced by KiSetGdtEntry(), and WinLdrSetProcessorContext().