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Linux Cross Reference
Linux/include/asm-i386/delay.h

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~ 
  1 #ifndef _I386_DELAY_H
  2 #define _I386_DELAY_H
  3 
  4 /*
  5  * Copyright (C) 1993 Linus Torvalds
  6  *
  7  * Delay routines calling functions in arch/i386/lib/delay.c
  8  */
  9  
 10 extern void __bad_udelay(void);
 11 
 12 extern void __udelay(unsigned long usecs);
 13 extern void __const_udelay(unsigned long usecs);
 14 extern void __delay(unsigned long loops);
 15 
 16 #define udelay(n) (__builtin_constant_p(n) ? \
 17         ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c6ul)) : \
 18         __udelay(n))
 19 
 20 #endif /* defined(_I386_DELAY_H) */
 21
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