mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
0413cfecea
Commits02f99901ed52d61227b6introduced a regression where platform-specific ffs/fls implementations were defined away. This patch corrects that by using PLATFORM_xxx instead of the name itself. Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net> Acked-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Stefan Roese <sr@denx.de>
155 lines
3 KiB
C
155 lines
3 KiB
C
#ifndef _LINUX_BITOPS_H
|
|
#define _LINUX_BITOPS_H
|
|
|
|
#include <asm/types.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;
|
|
}
|
|
|
|
/**
|
|
* fls - find last (most-significant) bit set
|
|
* @x: the word to search
|
|
*
|
|
* This is defined the same way as ffs.
|
|
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
static inline int generic_fls(int x)
|
|
{
|
|
int r = 32;
|
|
|
|
if (!x)
|
|
return 0;
|
|
if (!(x & 0xffff0000u)) {
|
|
x <<= 16;
|
|
r -= 16;
|
|
}
|
|
if (!(x & 0xff000000u)) {
|
|
x <<= 8;
|
|
r -= 8;
|
|
}
|
|
if (!(x & 0xf0000000u)) {
|
|
x <<= 4;
|
|
r -= 4;
|
|
}
|
|
if (!(x & 0xc0000000u)) {
|
|
x <<= 2;
|
|
r -= 2;
|
|
}
|
|
if (!(x & 0x80000000u)) {
|
|
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);
|
|
}
|
|
|
|
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
|
|
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
|
|
#include <asm/bitops.h>
|
|
|
|
/* linux/include/asm-generic/bitops/non-atomic.h */
|
|
|
|
#ifndef PLATFORM__SET_BIT
|
|
# define __set_bit generic_set_bit
|
|
#endif
|
|
|
|
#ifndef PLATFORM__CLEAR_BIT
|
|
# define __clear_bit generic_clear_bit
|
|
#endif
|
|
|
|
#ifndef PLATFORM_FFS
|
|
# define ffs generic_ffs
|
|
#endif
|
|
|
|
#ifndef PLATFORM_FLS
|
|
# define fls generic_fls
|
|
#endif
|
|
|
|
/**
|
|
* __set_bit - Set a bit in memory
|
|
* @nr: the bit to set
|
|
* @addr: the address to start counting from
|
|
*
|
|
* Unlike set_bit(), this function is non-atomic and may be reordered.
|
|
* If it's called on the same region of memory simultaneously, the effect
|
|
* may be that only one operation succeeds.
|
|
*/
|
|
static inline void generic_set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p |= mask;
|
|
}
|
|
|
|
static inline void generic_clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = BIT_MASK(nr);
|
|
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
|
|
|
|
*p &= ~mask;
|
|
}
|
|
|
|
#endif
|