delay.h
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上传日期:2013-02-24
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- /* $Id: delay.h,v 1.12.2.1 2002/02/02 02:11:52 kanoj Exp $
- * delay.h: Linux delay routines on the V9.
- *
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
- */
- #ifndef __SPARC64_DELAY_H
- #define __SPARC64_DELAY_H
- #include <linux/config.h>
- #include <linux/param.h>
- #ifndef __ASSEMBLY__
- #ifdef CONFIG_SMP
- #include <asm/smp.h>
- #else
- extern unsigned long loops_per_jiffy;
- #endif
- extern __inline__ void __delay(unsigned long loops)
- {
- __asm__ __volatile__(
- " b,pt %%xcc, 1fn"
- " cmp %0, 0n"
- " .align 32n"
- "1:n"
- " bne,pt %%xcc, 1bn"
- " subcc %0, 1, %0n"
- : "=&r" (loops)
- : "0" (loops)
- : "cc");
- }
- extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
- {
- usecs *= 0x00000000000010c6UL; /* 2**32 / 1000000 */
- __asm__ __volatile__(
- " mulx %1, %2, %0n"
- " srlx %0, 32, %0n"
- : "=r" (usecs)
- : "r" (usecs), "r" (lps));
- __delay(usecs * HZ);
- }
- #ifdef CONFIG_SMP
- #define __udelay_val cpu_data[smp_processor_id()].udelay_val
- #else
- #define __udelay_val loops_per_jiffy
- #endif
- #define udelay(usecs) __udelay((usecs),__udelay_val)
- #endif /* !__ASSEMBLY__ */
- #endif /* defined(__SPARC64_DELAY_H) */