patch-2.3.99-pre8 linux/arch/s390/lib/delay.c

• Lines: 46
• Date: Fri May 12 11:41:45 2000
• Orig file: v2.3.99-pre7/linux/arch/s390/lib/delay.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre7/linux/arch/s390/lib/delay.c linux/arch/s390/lib/delay.c
@@ -0,0 +1,45 @@
+/*
+ *  arch/s390/kernel/delay.c
+ *    Precise Delay Loops for S390
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ *
+ *  Derived from "arch/i386/lib/delay.c"
+ *    Copyright (C) 1993 Linus Torvalds
+ *    Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+
+#ifdef CONFIG_SMP
+#include <asm/smp.h>
+#endif
+
+void __delay(unsigned long loops)
+{
+	__asm__ __volatile__(
+                "0: ahi  %0,-1\n"
+                "   jnm  0b"
+                : /* no outputs */ : "r" (loops) );
+}
+
+inline void __const_udelay(unsigned long xloops)
+{
+
+	__asm__("LR    3,%1\n\t"
+		"MR    2,%2\n\t"
+		"LR    %0,2\n\t"
+		: "=r" (xloops)
+		: "r" (xloops) , "r"  (loops_per_sec)
+		: "2" , "3");
+        __delay(xloops);
+}
+
+void __udelay(unsigned long usecs)
+{
+	__const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
+}