aboutsummaryrefslogtreecommitdiff
path: root/include/asm-i386/delay.h
diff options
context:
space:
mode:
authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-12-07 02:14:07 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:07 +0100
commite6536c1262c56d302e749ab1b44fdb0b9786327d (patch)
tree6463b5c2eb8b156a6fcfffa283a803c0f8a8949b /include/asm-i386/delay.h
parentb9a8d94a47f8a41766f6f7944adfb1d641349903 (diff)
[PATCH] x86: comment magic constants in delay.h
For both i386 and x86_64, copy from arch/$ARCH/lib/delay.c comments about the used magic constants, plus a few other niceties. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andi Kleen <ak@suse.de> include/asm-i386/delay.h | 5 ++++- include/asm-x86_64/delay.h | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-)
Diffstat (limited to 'include/asm-i386/delay.h')
-rw-r--r--include/asm-i386/delay.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/asm-i386/delay.h b/include/asm-i386/delay.h
index b1c7650dc7b..9ae5e3782ed 100644
--- a/include/asm-i386/delay.h
+++ b/include/asm-i386/delay.h
@@ -7,6 +7,7 @@
* 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);
@@ -15,10 +16,12 @@ extern void __ndelay(unsigned long nsecs);
extern void __const_udelay(unsigned long usecs);
extern void __delay(unsigned long loops);
+/* 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))