1997/0208/pc/devrtc.c (diff list | history)

1996/0223/sys/src/9/pc/devrtc.c:118,141 – 1997/0208/sys/src/9/pc/devrtc.c:118,148 (short | long | prev | next)
1991/0911		#define GETBCD(o) ((bcdclock[o]&0xf) + 10*(bcdclock[o]>>4)) long rtctime(void)
1997/0208		static long _rtctime(void)
1991/0911		{ uchar bcdclock[Nbcd]; Rtc rtc;
1992/1208		int i;
1991/0911
1997/0208		/* don't do the read until the clock is no longer busy */
1992/1208		for(i = 0; i < 10000; i++){ outb(Paddr, Status); if((inb(Pdata) & 1) == 0)
1997/0208		if(inb(Pdata) & 0x80) continue; /* read clock values */ outb(Paddr, Seconds); bcdclock[0] = inb(Pdata); outb(Paddr, Minutes); bcdclock[1] = inb(Pdata); outb(Paddr, Hours); bcdclock[2] = inb(Pdata); outb(Paddr, Mday); bcdclock[3] = inb(Pdata); outb(Paddr, Month); bcdclock[4] = inb(Pdata); outb(Paddr, Year); bcdclock[5] = inb(Pdata); outb(Paddr, Status); if((inb(Pdata) & 0x80) == 0)
1992/1208		break; }
1991/0911		outb(Paddr, Seconds); bcdclock[0] = inb(Pdata); outb(Paddr, Minutes); bcdclock[1] = inb(Pdata); outb(Paddr, Hours); bcdclock[2] = inb(Pdata); outb(Paddr, Mday); bcdclock[3] = inb(Pdata); outb(Paddr, Month); bcdclock[4] = inb(Pdata); outb(Paddr, Year); bcdclock[5] = inb(Pdata); /* * convert from BCD
1996/0223/sys/src/9/pc/devrtc.c:157,166 – 1997/0208/sys/src/9/pc/devrtc.c:164,198
1991/0911		return rtc2sec(&rtc); }
1997/0208		Lock rtlock; long rtctime(void) { int i; long t, ot; ilock(&rtlock); /* loop till we get two reads in a row the same */ t = _rtctime(); for(i = 0; i < 100; i++){ ot = t; t = _rtctime(); if(ot == t) break; } if(i == 100) print("we are boofheads\n"); iunlock(&rtlock); return t; }
1991/0911		long rtcread(Chan *c, void *buf, long n, ulong offset) { ulong t, ot;
1997/0208		ulong t;
1993/0319		char *a;
1991/0911		if(c->qid.path & CHDIR)
1996/0223/sys/src/9/pc/devrtc.c:170,179 – 1997/0208/sys/src/9/pc/devrtc.c:202,207
1993/0319		case Qrtc: qlock(&rtclock); t = rtctime(); do{ ot = t; t = rtctime(); /* make sure there's no skew */ }while(t != ot); qunlock(&rtclock); n = readnum(offset, buf, n, t, 12); return n;