1 files changed, 111 insertions, 0 deletions
diff --git a/sys/boot/pc98/libpc98/time.c b/sys/boot/pc98/libpc98/time.c
new file mode 100644
index 0000000..406b180
--- /dev/null
+++ b/sys/boot/pc98/libpc98/time.c
@@ -0,0 +1,111 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <btxv86.h>
+#ifdef PC98
+#include <machine/cpufunc.h>
+#endif
+#include "bootstrap.h"
+#include "libi386.h"
+
+/*
+ * Return the time in seconds since the beginning of the day.
+ *
+ * If we pass midnight, don't wrap back to 0.
+ *
+ * XXX uses undocumented BCD support from libstand.
+ */
+
+time_t
+time(time_t *t)
+{
+    static time_t	lasttime, now;
+    int			hr, minute, sec;
+    
+#ifdef PC98
+    unsigned char	bios_time[6];
+#endif
+
+    v86.ctl = 0;
+#ifdef PC98
+    v86.addr = 0x1c;            /* int 0x1c, function 0 */
+    v86.eax = 0x0000;
+    v86.es  = VTOPSEG(bios_time);
+    v86.ebx = VTOPOFF(bios_time);
+#else
+    v86.addr = 0x1a;		/* int 0x1a, function 2 */
+    v86.eax = 0x0200;
+#endif
+    v86int();
+
+#ifdef PC98
+    hr = bcd2bin(bios_time[3]);
+    minute = bcd2bin(bios_time[4]);
+    sec = bcd2bin(bios_time[5]);
+#else
+    hr = bcd2bin((v86.ecx & 0xff00) >> 8);	/* hour in %ch */
+    minute = bcd2bin(v86.ecx & 0xff);		/* minute in %cl */
+    sec = bcd2bin((v86.edx & 0xff00) >> 8);	/* second in %dh */
+#endif
+    
+    now = hr * 3600 + minute * 60 + sec;
+    if (now < lasttime)
+	now += 24 * 3600;
+    lasttime = now;
+    
+    if (t != NULL)
+	*t = now;
+    return(now);
+}
+
+/*
+ * Use the BIOS Wait function to pause for (period) microseconds.
+ *
+ * Resolution of this function is variable, but typically around
+ * 1ms.
+ */
+void
+delay(int period)
+{
+#ifdef PC98
+    int i;
+    period = (period + 500) / 1000;
+    for( ; period != 0 ; period--)
+	for(i=800;i != 0; i--)
+	    outb(0x5f,0);       /* wait 600ns */
+#else
+    v86.ctl = 0;
+    v86.addr = 0x15;		/* int 0x15, function 0x86 */
+    v86.eax = 0x8600;
+    v86.ecx = period >> 16;
+    v86.edx = period & 0xffff;
+    v86int();
+#endif
+}