Source code of Windows XP (NT5)
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;++;; Copyright (c) 1996-97 Microsoft Corporation;; Module Name:;; mp8254.inc;; Abstract:;; This module contains common definitions for the 8254 used; by the timer tick routine and the query peformance counter; routine.;; Author:;; Shivnandan Kaushik;;--
;; Constants used to initialize timer 0;
TIMER1_DATA_PORT0 EQU 40H ; Timer1, channel 0 data portTIMER1_CONTROL_PORT0 EQU 43H ; Timer1, channel 0 control port
COMMAND_8254_COUNTER0 EQU 00H ; Select count 0COMMAND_8254_RW_16BIT EQU 30H ; Read/Write LSB first then MSBCOMMAND_8254_MODE2 EQU 4 ; Use mode 2COMMAND_8254_BCD EQU 0 ; Binary count downCOMMAND_8254_LATCH_READ EQU 0 ; Latch read command
PERFORMANCE_FREQUENCY EQU 1193182 ; frequency of 8254PERFORMANCE_INTERVAL EQU 0ffffH ; Maximum counter value
PERF_USE_8254 EQU 01hPERF_8254_INITIALIZED EQU 40h
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