94 lines
1.8 KiB
NASM
94 lines
1.8 KiB
NASM
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title "Trap Processing"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; int.asm
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;
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; Abstract:
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;
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; This module implements the code necessary to field and process i386
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; interrupt.
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;
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; Author:
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;
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; Shie-Lin Tzong (shielint) 8-Jan-1990
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;
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; Environment:
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;
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; Kernel mode only.
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;
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; Revision History:
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;
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;--
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.386p
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.xlist
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include ks386.inc
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include i386\kimacro.inc
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include callconv.inc
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.list
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;
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; Interrupt flag bit maks for EFLAGS
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;
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EFLAGS_IF equ 200H
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EFLAGS_SHIFT equ 9
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:FLAT, FS:NOTHING, GS:NOTHING
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; NOTE This routine is never actually called on standard x86 hardware,
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; because passive level doesn't actually exist. It's here to
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; fill out the portable skeleton.
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;
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; The following code is called when a passive release occurs and there is
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; no interrupt to process.
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;
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cPublicProc _KiPassiveRelease ,0
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stdRET _KiPassiveRelease ; cReturn
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stdENDP _KiPassiveRelease
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page ,132
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subttl "Disable Processor Interrupts"
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;++
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;
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; BOOLEAN
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; KeDisableInterrupts(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This routine disables interrupts at the processor level. It does not
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; edit the PICS or adjust IRQL, it is for use in the debugger only.
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;
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; Arguments:
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;
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; None
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;
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; Return Value:
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;
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; (eax) = !0 if interrupts were on, 0 if they were off
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;
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;--
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cPublicProc _KeDisableInterrupts ,0
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cPublicFpo 0, 0
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pushfd
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pop eax
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and eax,EFLAGS_IF ; (eax) = the interrupt bit
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shr eax,EFLAGS_SHIFT ; low bit of (eax) == interrupt bit
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cli
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stdRET _KeDisableInterrupts
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stdENDP _KeDisableInterrupts
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_TEXT ends
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end
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