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delay.h
Package: linux-2.4.20.tar.gz　[view]
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Linux-Unix program

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delay.h：Code Content
  1. /* $Id: delay.h,v 1.12.2.1 2002/02/02 02:11:52 kanoj Exp $
  2.  * delay.h: Linux delay routines on the V9.
  3.  *
  4.  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
  5.  */
  7. #ifndef __SPARC64_DELAY_H
  8. #define __SPARC64_DELAY_H
  10. #include <linux/config.h>
  11. #include <linux/param.h>
  13. #ifndef __ASSEMBLY__
  15. #ifdef CONFIG_SMP
  16. #include <asm/smp.h>
  17. #else
  18. extern unsigned long loops_per_jiffy;
  19. #endif 
  21. extern __inline__ void __delay(unsigned long loops)
  22. {
  23. __asm__ __volatile__(
  24. " b,pt %%xcc, 1fn"
  25. "  cmp %0, 0n"
  26. " .align 32n"
  27. "1:n"
  28. " bne,pt %%xcc, 1bn"
  29. "  subcc %0, 1, %0n"
  30. : "=&r" (loops)
  31. : "0" (loops)
  32. : "cc");
  33. }
  35. extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
  36. {
  37. usecs *= 0x00000000000010c6UL; /* 2**32 / 1000000 */
  39. __asm__ __volatile__(
  40. " mulx %1, %2, %0n"
  41. " srlx %0, 32, %0n"
  42. : "=r" (usecs)
  43. : "r" (usecs), "r" (lps));
  45. __delay(usecs * HZ);
  46. }
  48. #ifdef CONFIG_SMP
  49. #define __udelay_val cpu_data[smp_processor_id()].udelay_val
  50. #else
  51. #define __udelay_val loops_per_jiffy
  52. #endif
  54. #define udelay(usecs) __udelay((usecs),__udelay_val)
  56. #endif /* !__ASSEMBLY__ */
  58. #endif /* defined(__SPARC64_DELAY_H) */