Add initial support for the FreeBSD/alpha kernel. This is very much a

work in progress and has never booted a real machine.  Initial
development and testing was done using SimOS (see
http://simos.stanford.edu for details).  On the SimOS simulator, this
port successfully reaches single-user mode and has been tested with
loads as high as one copy of /bin/ls :-).

Obtained from: partly from NetBSD/alpha

1 files changed, 141 insertions, 0 deletions

diff --git a/sys/dev/dec/mcclock.c b/sys/dev/dec/mcclock.c
new file mode 100644
index 0000000..76e3805
--- /dev/null
+++ b/sys/dev/dec/mcclock.c
@@ -0,0 +1,141 @@
+/* $Id$ */
+/* $NetBSD: mcclock.c,v 1.11 1998/04/19 07:50:25 jonathan Exp $ */
+
+/*
+ * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Chris G. Demetriou
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+
+#include <dev/dec/clockvar.h>
+#include <dev/dec/mcclockvar.h>
+#include <dev/dec/mc146818reg.h>
+
+/*
+ * XXX rate is machine-dependent.
+ */
+#ifdef __alpha__
+#define MC_DEFAULTRATE MC_RATE_1024_Hz
+#endif
+#ifdef __pmax__
+#define MC_DEFAULTRATE MC_RATE_256_Hz
+#endif
+
+
+void	mcclock_init __P((struct device *));
+void	mcclock_get __P((struct device *, time_t, struct clocktime *));
+void	mcclock_set __P((struct device *, struct clocktime *));
+
+const struct clockfns mcclock_clockfns = {
+	mcclock_init, mcclock_get, mcclock_set,
+};
+
+#define	mc146818_write(dev, reg, datum)					\
+	    (*(dev)->sc_busfns->mc_bf_write)(dev, reg, datum)
+#define	mc146818_read(dev, reg)						\
+	    (*(dev)->sc_busfns->mc_bf_read)(dev, reg)
+
+void
+mcclock_attach(sc, busfns)
+	struct mcclock_softc *sc;
+	const struct mcclock_busfns *busfns;
+{
+	sc->sc_busfns = busfns;
+
+	/* Turn interrupts off, just in case. */
+	mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
+
+	clockattach(sc->sc_dev, &mcclock_clockfns);
+}
+
+void
+mcclock_init(dev)
+	device_t dev;
+{
+	struct mcclock_softc *sc = device_get_softc(dev);
+
+	mc146818_write(sc, MC_REGA, MC_BASE_32_KHz | MC_DEFAULTRATE);
+	mc146818_write(sc, MC_REGB,
+	    MC_REGB_PIE | MC_REGB_SQWE | MC_REGB_BINARY | MC_REGB_24HR);
+}
+
+/*
+ * Get the time of day, based on the clock's value and/or the base value.
+ */
+void
+mcclock_get(dev, base, ct)
+	struct device *dev;
+	time_t base;
+	struct clocktime *ct;
+{
+	struct mcclock_softc *sc = device_get_softc(dev);
+	mc_todregs regs;
+	int s;
+
+	s = splclock();
+	MC146818_GETTOD(sc, &regs)
+	splx(s);
+
+	ct->sec = regs[MC_SEC];
+	ct->min = regs[MC_MIN];
+	ct->hour = regs[MC_HOUR];
+	ct->dow = regs[MC_DOW];
+	ct->day = regs[MC_DOM];
+	ct->mon = regs[MC_MONTH];
+	ct->year = regs[MC_YEAR];
+}
+
+/*
+ * Reset the TODR based on the time value.
+ */
+void
+mcclock_set(dev, ct)
+	struct device *dev;
+	struct clocktime *ct;
+{
+	struct mcclock_softc *sc = device_get_softc(dev);
+	mc_todregs regs;
+	int s;
+
+	s = splclock();
+	MC146818_GETTOD(sc, &regs);
+	splx(s);
+
+	regs[MC_SEC] = ct->sec;
+	regs[MC_MIN] = ct->min;
+	regs[MC_HOUR] = ct->hour;
+	regs[MC_DOW] = ct->dow;
+	regs[MC_DOM] = ct->day;
+	regs[MC_MONTH] = ct->mon;
+	regs[MC_YEAR] = ct->year;
+
+	s = splclock();
+	MC146818_PUTTOD(sc, &regs);
+	splx(s);
+}