diff options
| author | Thomas Schwinge <tschwinge@gnu.org> | 2006-06-09 23:50:14 +0000 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@gnu.org> | 2009-06-18 00:26:37 +0200 |
| commit | 57c412aeb0f2e475adc33e5c86b2ddfec0453dec (patch) | |
| tree | a0811153322a5201aa779d2e08b3c09053daa502 /linux/src/include/asm-i386/bitops.h | |
| parent | 46066cf8d9392a3a9a423f4a7e6c0582a1efcd88 (diff) | |
| download | gnumach-57c412aeb0f2e475adc33e5c86b2ddfec0453dec.tar.gz gnumach-57c412aeb0f2e475adc33e5c86b2ddfec0453dec.tar.bz2 gnumach-57c412aeb0f2e475adc33e5c86b2ddfec0453dec.zip | |
2006-06-09 Stefan Siegl <stesie@brokenpipe.de>
* linux/dev/include/asm-i386/uaccess.h: New dummy file.
* linux/dev/include/linux/pm.h: Likewise.
* linux/dev/include/linux/threads.h: Likewise.
* linux/src/include/linux/symtab_begin.h: New file from Linux 2.0.40.
* linux/src/include/linux/symtab_end.h: Likewise.
* linux/src/include/linux/module.h: Update from Linux 2.0.40 with minor
changes.
* linux/src/include/linux/list.h: New file from Linux 2.2.26.
* linux/src/include/linux/kcomp.h: Likewise with minor changes.
* linux/src/include/linux/wait.h: Update from Linux 2.2.26.
* linux/src/include/linux/wireless.h: Likewise.
* linux/src/include/asm-i386/bitops.h [__KERNEL__] (ffs, hweight32)
(hweight16, hweight8): Copy from Linux 2.2.26.
Diffstat (limited to 'linux/src/include/asm-i386/bitops.h')
| -rw-r--r-- | linux/src/include/asm-i386/bitops.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/linux/src/include/asm-i386/bitops.h b/linux/src/include/asm-i386/bitops.h index e3ea8f54..d3ed1fb9 100644 --- a/linux/src/include/asm-i386/bitops.h +++ b/linux/src/include/asm-i386/bitops.h @@ -134,4 +134,34 @@ extern __inline__ unsigned long ffz(unsigned long word) return word; } +#ifdef __KERNEL__ + +/* + * ffs: find first bit set. This is defined the same way as + * the libc and compiler builtin ffs routines, therefore + * differs in spirit from the above ffz (man ffs). + */ + +extern __inline__ int ffs(int x) +{ + int r; + + __asm__("bsfl %1,%0\n\t" + "jnz 1f\n\t" + "movl $-1,%0\n" + "1:" : "=r" (r) : "g" (x)); + return r+1; +} + +/* + * hweightN: returns the hamming weight (i.e. the number + * of bits set) of a N-bit word + */ + +#define hweight32(x) generic_hweight32(x) +#define hweight16(x) generic_hweight16(x) +#define hweight8(x) generic_hweight8(x) + +#endif /* __KERNEL__ */ + #endif /* _I386_BITOPS_H */ |