1 files changed, 56 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/time.c b/sys/boot/i386/libi386/time.c
new file mode 100644
index 0000000..51150bd
--- /dev/null
+++ b/sys/boot/i386/libi386/time.c
@@ -0,0 +1,56 @@
+/*
+ * mjs copyright
+ */
+
+#include <stand.h>
+#include <btxv86.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, min, sec;
+    
+    v86.ctl = 0;
+    v86.addr = 0x1a;		/* int 0x1a, function 2 */
+    v86.eax = 0x0200;
+    v86int();
+
+    hr = bcd2bin((v86.ecx & 0xff00) >> 8);	/* hour in %ch */
+    min = bcd2bin(v86.ecx & 0xff);		/* minute in %cl */
+    sec = bcd2bin((v86.edx & 0xff00) >> 8);	/* second in %dh */
+    
+    now = hr * 3600 + min * 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)
+{
+    v86.ctl = 0;
+    v86.addr = 0x15;		/* int 0x1a, function 0x86 */
+    v86.eax = 0x8600;
+    v86.ecx = period >> 16;
+    v86.edx = period & 0xffff;
+    v86int();
+}