diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/delay.h |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/linux/delay.h')
-rw-r--r-- | include/linux/delay.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/include/linux/delay.h b/include/linux/delay.h new file mode 100644 index 000000000000..acb74865b973 --- /dev/null +++ b/include/linux/delay.h | |||
@@ -0,0 +1,50 @@ | |||
1 | #ifndef _LINUX_DELAY_H | ||
2 | #define _LINUX_DELAY_H | ||
3 | |||
4 | /* | ||
5 | * Copyright (C) 1993 Linus Torvalds | ||
6 | * | ||
7 | * Delay routines, using a pre-computed "loops_per_jiffy" value. | ||
8 | */ | ||
9 | |||
10 | extern unsigned long loops_per_jiffy; | ||
11 | |||
12 | #include <asm/delay.h> | ||
13 | |||
14 | /* | ||
15 | * Using udelay() for intervals greater than a few milliseconds can | ||
16 | * risk overflow for high loops_per_jiffy (high bogomips) machines. The | ||
17 | * mdelay() provides a wrapper to prevent this. For delays greater | ||
18 | * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture | ||
19 | * specific values can be defined in asm-???/delay.h as an override. | ||
20 | * The 2nd mdelay() definition ensures GCC will optimize away the | ||
21 | * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G. | ||
22 | */ | ||
23 | |||
24 | #ifndef MAX_UDELAY_MS | ||
25 | #define MAX_UDELAY_MS 5 | ||
26 | #endif | ||
27 | |||
28 | #ifdef notdef | ||
29 | #define mdelay(n) (\ | ||
30 | {unsigned long __ms=(n); while (__ms--) udelay(1000);}) | ||
31 | #else | ||
32 | #define mdelay(n) (\ | ||
33 | (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \ | ||
34 | ({unsigned long __ms=(n); while (__ms--) udelay(1000);})) | ||
35 | #endif | ||
36 | |||
37 | #ifndef ndelay | ||
38 | #define ndelay(x) udelay(((x)+999)/1000) | ||
39 | #endif | ||
40 | |||
41 | void calibrate_delay(void); | ||
42 | void msleep(unsigned int msecs); | ||
43 | unsigned long msleep_interruptible(unsigned int msecs); | ||
44 | |||
45 | static inline void ssleep(unsigned int seconds) | ||
46 | { | ||
47 | msleep(seconds * 1000); | ||
48 | } | ||
49 | |||
50 | #endif /* defined(_LINUX_DELAY_H) */ | ||