| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_DELAY_H |
| 2 | #define _ASM_X86_DELAY_H |
| Thomas Gleixner | f1ea054 | 2007-10-15 23:28:20 +0200 | [diff] [blame] | 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); |
| Jeff Dike | 5ab24c7 | 2008-02-06 01:37:19 -0800 | [diff] [blame] | 16 | extern void __const_udelay(unsigned long xloops); |
| Thomas Gleixner | f1ea054 | 2007-10-15 23:28:20 +0200 | [diff] [blame] | 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 | |
| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 31 | #endif /* _ASM_X86_DELAY_H */ |