File: /usr/src/linux/include/asm-sparc64/delay.h

1     /* $Id: delay.h,v 1.12 2001/04/24 01:09:12 davem Exp $
2      * delay.h: Linux delay routines on the V9.
3      *
4      * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
5      */
6     
7     #ifndef __SPARC64_DELAY_H
8     #define __SPARC64_DELAY_H
9     
10     #include <linux/config.h>
11     #include <linux/param.h>
12     #ifdef CONFIG_SMP
13     #include <linux/sched.h>
14     #include <asm/smp.h>
15     #endif 
16     
17     extern __inline__ void __delay(unsigned long loops)
18     {
19     	__asm__ __volatile__(
20     "	b,pt	%%xcc, 1f\n"
21     "	 cmp	%0, 0\n"
22     "	.align	32\n"
23     "1:\n"
24     "	bne,pt	%%xcc, 1b\n"
25     "	 subcc	%0, 1, %0\n"
26     	: "=&r" (loops)
27     	: "0" (loops)
28     	: "cc");
29     }
30     
31     extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
32     {
33     	usecs *= 0x00000000000010c6UL;		/* 2**32 / 1000000 */
34     
35     	__asm__ __volatile__(
36     "	mulx	%1, %2, %0\n"
37     "	srlx	%0, 32, %0\n"
38     	: "=r" (usecs)
39     	: "r" (usecs), "r" (lps));
40     
41     	__delay(usecs * HZ);
42     }
43     
44     #ifdef CONFIG_SMP
45     #define __udelay_val cpu_data[smp_processor_id()].udelay_val
46     #else
47     #define __udelay_val loops_per_jiffy
48     #endif
49     
50     #define udelay(usecs) __udelay((usecs),__udelay_val)
51     
52     #endif /* defined(__SPARC64_DELAY_H) */
53