46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
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/*++
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Copyright (c) 1996-2000 Microsoft Corporation
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Module Name:
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eflags.h
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Abstract:
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Bit positions for the various flag bits inside EFLAGS
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Author:
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Barry Bond (barrybo) creation-date 25-January-2000
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Revision History:
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--*/
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#ifndef _EFLAGS_INCLUDED
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#define _EFLAGS_INCLUDED
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#define FLAG_CF (1<<0) // carry
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// bit 1 is always 1
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#define FLAG_PF (1<<2) // parity
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// bit 3 is always 0
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#define FLAG_AUX (1<<4) // aux carry
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// bit 5 is always 0
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#define FLAG_ZF (1<<6) // zero
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#define FLAG_SF (1<<7) // sign
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#define FLAG_TF (1<<8) // trap
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#define FLAG_IF (1<<9) // interrupt enable
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#define FLAG_DF (1<<10) // direction
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#define FLAG_OF (1<<11) // overflow
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#define FLAG_IOPL (3<<12) // IOPL = 3
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#define FLAG_NT (1<<14) // nested task
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// bit 15 is 0
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#define FLAG_RF (1<<16) // resume flag
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#define FLAG_VM (1<<17) // virtual mode
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#define FLAG_AC (1<<18) // alignment check
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#define FLAG_ID (1<<21) // ID bit (CPUID present if this can be toggled)
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#endif //_EFLAGS_INCLUDED
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