1 #ifndef _ASM_X86_DELAY_H 2 #define _ASM_X86_DELAY_H 3 4 /* 5 * Copyright (C) 1993 Linus Torvalds 6 * 7 * Delay routines calling functions in arch/x86/lib/delay.c 8 */ 9 10 /* Undefined functions to get compile-time errors */ 11 extern void __bad_udelay(void); 12 extern void __bad_ndelay(void); 13 14 extern void __udelay(unsigned long usecs); 15 extern void __ndelay(unsigned long nsecs); 16 extern void __const_udelay(unsigned long usecs); 17 extern void __delay(unsigned long loops); 18 19 /* 0x10c7 is 2**32 / 1000000 (rounded up) */ 20 #define udelay(n) (__builtin_constant_p(n) ? \ 21 ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ 22 __udelay(n)) 23 24 /* 0x5 is 2**32 / 1000000000 (rounded up) */ 25 #define ndelay(n) (__builtin_constant_p(n) ? \ 26 ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ 27 __ndelay(n)) 28 29 void use_tsc_delay(void); 30 31 #endif /* _ASM_X86_DELAY_H */ 32
