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Last change
on this file was 151, checked in by sandervl, 25 years ago |
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Author Date Id Revision
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| [142] | 1 | /* $Id: delay.h 151 2000-05-28 16:50:46Z sandervl $ */
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| 2 |
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| 3 | #ifndef _LINUX_DELAY_H
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| 4 | #define _LINUX_DELAY_H
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 1993 Linus Torvalds
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| 8 | *
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| 9 | * Delay routines, using a pre-computed "loops_per_second" value.
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| 10 | */
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| 11 |
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| 12 | extern unsigned long loops_per_sec;
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| 13 |
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| 14 | #include <asm/delay.h>
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| 15 |
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| 16 | /*
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| 17 | * Using udelay() for intervals greater than a few milliseconds can
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| 18 | * risk overflow for high loops_per_sec (high bogomips) machines. The
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| 19 | * mdelay() provides a wrapper to prevent this. For delays greater
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| 20 | * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
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| 21 | * specific values can be defined in asm-???/delay.h as an override.
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| 22 | * The 2nd mdelay() definition ensures GCC will optimize away the
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| 23 | * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
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| 24 | */
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| 25 |
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| 26 | #ifndef MAX_UDELAY_MS
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| 27 | #define MAX_UDELAY_MS 5
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| 28 | #endif
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| 29 |
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| [151] | 30 | void iodelay(unsigned long);
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| 31 | #pragma aux iodelay parm nomemory [ecx] modify nomemory exact [eax ecx];
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| [142] | 32 |
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| 33 | #define mdelay(n) iodelay(n*2)
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| 34 |
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| 35 | #endif /* defined(_LINUX_DELAY_H) */
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