1994/0512/pc/clock.c (diff list | history)

1994/0510/sys/src/9/pc/clock.c:22,27 – 1994/0512/sys/src/9/pc/clock.c:22,28 (short | long | prev | next)
change from square wave to retriggered 1/HZ interrupts. (maybe hw problems? XXX). avoid needless splhi/spllo back and forth. rsc Fri Mar 4 12:44:25 2005
1992/0923		/* modes */ Square= 0x36, /* perioic square wave */
1994/0512		Trigger= 0x30, /* interrupt on terminal count */
1992/0923		Freq= 1193182, /* Real clock frequency */
1991/0705		};
1994/0510/sys/src/9/pc/clock.c:47,56 – 1994/0512/sys/src/9/pc/clock.c:48,65
1993/1124		{ Proc *p; int nrun = 0;
1994/0512		int islow = 0;
1994/0510		extern int hwcursor;
1993/1124		USED(arg);
1994/0512		/* * set clock for 1/HZ seconds */ outb(Tmode, Load0|Trigger); outb(T0cntr, (Freq/HZ)); /* low byte */ outb(T0cntr, (Freq/HZ)>>8); /* high byte */
1993/1124		m->ticks++;
1994/0510		uartclock();
1994/0510/sys/src/9/pc/clock.c:75,93 – 1994/0512/sys/src/9/pc/clock.c:84,111
1994/0507		sched(); /* user profiling clock */
1994/0512		islow = 1;
1994/0507		spllo(); /* in case we fault */ (*(ulong*)(USTKTOP-BY2WD)) += TK2MS(1); splhi(); }
1993/1124
1994/0512		/* * anything from here down can be running spllo() */
1994/0507		/* last because it could spllo() */
1994/0510		if(hwcursor) mouseclock(); else { spllo();
1994/0512		if(!islow){ islow = 1; spllo(); }
1994/0510		mouseclock(); splhi(); }
1994/0512		if(islow) splhi();
1993/1124		}
1994/0302		/*
1994/0510/sys/src/9/pc/clock.c:131,139 – 1994/0512/sys/src/9/pc/clock.c:149,157
1993/1124		setvec(Clockvec, clock, 0);
1991/0709		/* * make clock output a square wave with a 1/HZ period
1994/0512		* set clock for 1/HZ seconds
1991/0709		*/
1992/0923		outb(Tmode, Load0|Square);
1994/0512		outb(Tmode, Load0|Trigger);
1991/0709		outb(T0cntr, (Freq/HZ)); /* low byte */ outb(T0cntr, (Freq/HZ)>>8); /* high byte */
1992/0922