| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Paolo 'Blaisorblade' Giarrusso | e6536c1 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 10 | /* Undefined functions to get compile-time errors */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Paolo 'Blaisorblade' Giarrusso | e6536c1 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 19 | /* 0x10c7 is 2**32 / 1000000 (rounded up) */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #define udelay(n) (__builtin_constant_p(n) ? \ |
| 21 | ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ |
| 22 | __udelay(n)) |
| Paolo 'Blaisorblade' Giarrusso | e6536c1 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 23 | |
| 24 | /* 0x5 is 2**32 / 1000000000 (rounded up) */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #define ndelay(n) (__builtin_constant_p(n) ? \ |
| 26 | ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ |
| 27 | __ndelay(n)) |
| 28 | |
| john stultz | 6f84fa2 | 2006-06-26 00:25:11 -0700 | [diff] [blame] | 29 | void use_tsc_delay(void); |
| 30 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #endif /* defined(_I386_DELAY_H) */ |