72 lines
1.2 KiB
NASM
72 lines
1.2 KiB
NASM
title "NtGetTickCount"
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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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; tickcnt.asm
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;
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; Abstract:
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;
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;
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; This module contains the implementation for the fast NtGetTickCount service
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;
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;
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; Author:
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;
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; Mark Lucovsky (markl) 19-Oct-1996
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;
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; Environment:
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;
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; Kernel mode.
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;
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; Revision History:
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;
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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 callconv.inc ; calling convention macros
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; .list
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extrn _KeTickCount:DWORD
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extrn _ExpTickCountMultiplier:DWORD
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_TEXT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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page ,132
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;++
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;
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; Routine Description:
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;
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; This function returns number of milliseconds since the system
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; booted. This function is designed to support the Win32 GetTicKCount
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; API.
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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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; Returns the number of milliseconds that have transpired since boot
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;
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;--
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cPublicProc _NtGetTickCount, 0
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cPublicFpo 0, 0
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mov eax,dword ptr [_KeTickCount]
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mul dword ptr [_ExpTickCountMultiplier]
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shrd eax,edx,24 ; compute resultant tick count
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stdRET _NtGetTickCount
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stdENDP _NtGetTickCount
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_TEXT ends
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end
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