patch-2.1.67 linux/include/asm-i386/delay.h

• Lines: 70
• Date: Sat Nov 29 10:33:21 1997
• Orig file: v2.1.66/linux/include/asm-i386/delay.h
• Orig date: Tue May 13 22:41:17 1997

diff -u --recursive --new-file v2.1.66/linux/include/asm-i386/delay.h linux/include/asm-i386/delay.h
@@ -4,61 +4,15 @@
 /*
  * Copyright (C) 1993 Linus Torvalds
  *
- * Delay routines, using a pre-computed "loops_per_second" value.
+ * Delay routines calling functions in arch/i386/lib/delay.c
  */
  
-#ifdef __SMP__
-#include <asm/smp.h>
-#endif 
-
-extern __inline__ void __delay(int loops)
-{
-	__asm__ __volatile__(
-		".align 2,0x90\n1:\tdecl %0\n\tjns 1b"
-		:/* no outputs */
-		:"a" (loops)
-		:"ax");
-}
-
-/*
- * division by multiplication: you don't have to worry about
- * loss of precision.
- *
- * Use only for very small delays ( < 1 msec).  Should probably use a
- * lookup table, really, as the multiplications take much too long with
- * short delays.  This is a "reasonable" implementation, though (and the
- * first constant multiplications gets optimized away if the delay is
- * a constant)
- */
-extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
-{
-	usecs *= 0x000010c6;		/* 2**32 / 1000000 */
-	__asm__("mull %0"
-		:"=d" (usecs)
-		:"a" (usecs),"0" (lps)
-		:"ax");
-		
-	__delay(usecs);
-}
-
-#ifdef __SMP__
-#define __udelay_val cpu_data[smp_processor_id()].udelay_val
-#else
-#define __udelay_val loops_per_sec
-#endif
-
-#define udelay(usecs) __udelay((usecs),__udelay_val)
-
-
-extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
-{
-	__asm__("mull %1 ; divl %2"
-		:"=a" (a)
-		:"d" (b),
-		 "r" (c),
-		 "0" (a)
-		:"dx");
-	return a;
-}
+extern void __udelay(unsigned long usecs);
+extern void __const_udelay(unsigned long usecs);
+extern void __delay(unsigned long loops);
+
+#define udelay(n) (__builtin_constant_p(n) ? \
+	__const_udelay((n) * 0x10c6) : \
+	__udelay(n))
 
 #endif /* defined(_I386_DELAY_H) */