patch-2.1.67 linux/arch/i386/lib/delay.c

• Lines: 46
• Date: Sat Nov 29 10:33:18 1997
• Orig file: v2.1.66/linux/arch/i386/lib/delay.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.66/linux/arch/i386/lib/delay.c linux/arch/i386/lib/delay.c
@@ -0,0 +1,45 @@
+/*
+ *	Precise Delay Loops for i386
+ *
+ *	Copyright (C) 1993 Linus Torvalds
+ *	Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ *
+ *	The __delay function must _NOT_ be inlined as its execution time
+ *	depends wildly on alignment on many x86 processors.
+ */
+
+#include <linux/sched.h>
+#include <asm/delay.h>
+
+#ifdef __SMP__
+#include <asm/smp.h>
+#endif
+
+#ifdef __SMP__
+#define __udelay_val cpu_data[smp_processor_id()].udelay_val
+#else
+#define __udelay_val loops_per_sec
+#endif
+
+void __delay(unsigned long loops)
+{
+	__asm__ __volatile__(
+ 		"1:\tdecl %0\n\tjns 1b"
+		:/* no outputs */
+		:"a" (loops)
+		:"ax");
+}
+
+inline void __const_udelay(unsigned long xloops)
+{
+	__asm__("mull %0"
+		:"=d" (xloops)
+		:"a" (xloops),"0" (__udelay_val)
+		:"ax");
+        __delay(xloops);
+}
+
+void __udelay(unsigned long usecs)
+{
+	__const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
+}