mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-04 18:41:03 +00:00
8bde7f776c
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
#ifndef _LINUX_BITOPS_H
|
|
#define _LINUX_BITOPS_H
|
|
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
|
|
static inline int generic_ffs(int x)
|
|
{
|
|
int r = 1;
|
|
|
|
if (!x)
|
|
return 0;
|
|
if (!(x & 0xffff)) {
|
|
x >>= 16;
|
|
r += 16;
|
|
}
|
|
if (!(x & 0xff)) {
|
|
x >>= 8;
|
|
r += 8;
|
|
}
|
|
if (!(x & 0xf)) {
|
|
x >>= 4;
|
|
r += 4;
|
|
}
|
|
if (!(x & 3)) {
|
|
x >>= 2;
|
|
r += 2;
|
|
}
|
|
if (!(x & 1)) {
|
|
x >>= 1;
|
|
r += 1;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* hweightN: returns the hamming weight (i.e. the number
|
|
* of bits set) of a N-bit word
|
|
*/
|
|
|
|
static inline unsigned int generic_hweight32(unsigned int w)
|
|
{
|
|
unsigned int res = (w & 0x55555555) + ((w >> 1) & 0x55555555);
|
|
res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
|
|
res = (res & 0x0F0F0F0F) + ((res >> 4) & 0x0F0F0F0F);
|
|
res = (res & 0x00FF00FF) + ((res >> 8) & 0x00FF00FF);
|
|
return (res & 0x0000FFFF) + ((res >> 16) & 0x0000FFFF);
|
|
}
|
|
|
|
static inline unsigned int generic_hweight16(unsigned int w)
|
|
{
|
|
unsigned int res = (w & 0x5555) + ((w >> 1) & 0x5555);
|
|
res = (res & 0x3333) + ((res >> 2) & 0x3333);
|
|
res = (res & 0x0F0F) + ((res >> 4) & 0x0F0F);
|
|
return (res & 0x00FF) + ((res >> 8) & 0x00FF);
|
|
}
|
|
|
|
static inline unsigned int generic_hweight8(unsigned int w)
|
|
{
|
|
unsigned int res = (w & 0x55) + ((w >> 1) & 0x55);
|
|
res = (res & 0x33) + ((res >> 2) & 0x33);
|
|
return (res & 0x0F) + ((res >> 4) & 0x0F);
|
|
}
|
|
|
|
#include <asm/bitops.h>
|
|
|
|
|
|
#endif
|