| #ifndef _I386_DELAY_H |
| #define _I386_DELAY_H |
| |
| /* |
| * Copyright (C) 1993 Linus Torvalds |
| * |
| * Delay routines calling functions in arch/i386/lib/delay.c |
| */ |
| |
| /* Undefined functions to get compile-time errors */ |
| extern void __bad_udelay(void); |
| extern void __bad_ndelay(void); |
| |
| extern void __udelay(unsigned long usecs); |
| extern void __ndelay(unsigned long nsecs); |
| extern void __const_udelay(unsigned long usecs); |
| extern void __delay(unsigned long loops); |
| |
| #if defined(CONFIG_PARAVIRT) && !defined(USE_REAL_TIME_DELAY) |
| #define udelay(n) paravirt_ops.const_udelay((n) * 0x10c7ul) |
| |
| #define ndelay(n) paravirt_ops.const_udelay((n) * 5ul) |
| |
| #else /* !PARAVIRT || USE_REAL_TIME_DELAY */ |
| |
| /* 0x10c7 is 2**32 / 1000000 (rounded up) */ |
| #define udelay(n) (__builtin_constant_p(n) ? \ |
| ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \ |
| __udelay(n)) |
| |
| /* 0x5 is 2**32 / 1000000000 (rounded up) */ |
| #define ndelay(n) (__builtin_constant_p(n) ? \ |
| ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \ |
| __ndelay(n)) |
| #endif |
| |
| void use_tsc_delay(void); |
| |
| #endif /* defined(_I386_DELAY_H) */ |