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/*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#ifndef __CF_BITOPS__
#define __CF_BITOPS__
#ifndef _LINUX_BITOPS_H
#error only <linux/bitops.h> can be included directly
#endif
#include <linux/compiler.h>
#define test_and_set_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_test_and_set_bit(nr, vaddr) : \
__generic_coldfire_test_and_set_bit(nr, vaddr))
static __inline__ int __constant_coldfire_test_and_set_bit(int nr,
volatile void *vaddr)
{
char retval;
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bset %2,(%4); sne %0"
: "=d" (retval), "=m" (*p)
: "di" (nr & 7), "m" (*p), "a" (p));
return retval;
}
static __inline__ int __generic_coldfire_test_and_set_bit(int nr,
volatile void *vaddr)
{
char retval;
__asm__ __volatile__ ("bset %2,%1; sne %0"
: "=d" (retval), "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "d" (nr)
: "memory");
return retval;
}
#define __test_and_set_bit(nr, vaddr) test_and_set_bit(nr, vaddr)
#define set_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_set_bit(nr, vaddr) : \
__generic_coldfire_set_bit(nr, vaddr))
static __inline__ void __constant_coldfire_set_bit(int nr,
volatile void *vaddr)
{
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bset %1,(%3)"
: "=m" (*p) : "di" (nr & 7), "m" (*p), "a" (p));
}
static __inline__ void __generic_coldfire_set_bit(int nr,
volatile void *vaddr)
{
__asm__ __volatile__ ("bset %1,%0"
: "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "d" (nr)
: "memory");
}
#define __set_bit(nr, vaddr) set_bit(nr, vaddr)
#define test_and_clear_bit(nr, vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_test_and_clear_bit(nr, vaddr) : \
__generic_coldfire_test_and_clear_bit(nr, vaddr))
static __inline__ int __constant_coldfire_test_and_clear_bit(int nr,
volatile void *vaddr)
{
char retval;
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bclr %2,(%4); sne %0"
: "=d" (retval), "=m" (*p)
: "id" (nr & 7), "m" (*p), "a" (p));
return retval;
}
static __inline__ int __generic_coldfire_test_and_clear_bit(int nr,
volatile void *vaddr)
{
char retval;
__asm__ __volatile__ ("bclr %2,%1; sne %0"
: "=d" (retval), "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "d" (nr & 7)
: "memory");
return retval;
}
#define __test_and_clear_bit(nr, vaddr) test_and_clear_bit(nr, vaddr)
/*
* clear_bit() doesn't provide any barrier for the compiler.
*/
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
#define clear_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_clear_bit(nr, vaddr) : \
__generic_coldfire_clear_bit(nr, vaddr))
static __inline__ void __constant_coldfire_clear_bit(int nr,
volatile void *vaddr)
{
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bclr %1,(%3)"
: "=m" (*p) : "id" (nr & 7), "m" (*p), "a" (p));
}
static __inline__ void __generic_coldfire_clear_bit(int nr,
volatile void *vaddr)
{
__asm__ __volatile__ ("bclr %1,%0"
: "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "d" (nr)
: "memory");
}
#define __clear_bit(nr, vaddr) clear_bit(nr, vaddr)
#define test_and_change_bit(nr, vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_test_and_change_bit(nr, vaddr) : \
__generic_coldfire_test_and_change_bit(nr, vaddr))
static __inline__ int __constant_coldfire_test_and_change_bit(int nr,
volatile void *vaddr)
{
char retval;
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bchg %2,(%4); sne %0"
: "=d" (retval), "=m" (*p)
: "id" (nr & 7), "m" (*p), "a" (p));
return retval;
}
static __inline__ int __generic_coldfire_test_and_change_bit(int nr,
volatile void *vaddr)
{
char retval;
__asm__ __volatile__ ("bchg %2,%1; sne %0"
: "=d" (retval), "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "id" (nr)
: "memory");
return retval;
}
#define __test_and_change_bit(nr, vaddr) test_and_change_bit(nr, vaddr)
#define __change_bit(nr, vaddr) change_bit(nr, vaddr)
#define change_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_coldfire_change_bit(nr, vaddr) : \
__generic_coldfire_change_bit(nr, vaddr))
static __inline__ void __constant_coldfire_change_bit(int nr,
volatile void *vaddr)
{
volatile char *p = &((volatile char *)vaddr)[(nr^31) >> 3];
__asm__ __volatile__ ("bchg %1,(%3)"
: "=m" (*p) : "id" (nr & 7), "m" (*p), "a" (p));
}
static __inline__ void __generic_coldfire_change_bit(int nr,
volatile void *vaddr)
{
__asm__ __volatile__ ("bchg %1,%0"
: "=m" (((volatile char *)vaddr)[(nr^31) >> 3])
: "d" (nr)
: "memory");
}
static inline int test_bit(int nr, const unsigned long *vaddr)
{
return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
}
static __inline__ unsigned long ffz(unsigned long word)
{
unsigned long result = 0;
while (word & 1) {
result++;
word >>= 1;
}
return result;
}
/* find_next_zero_bit() finds the first zero bit in a bit string of length
* 'size' bits, starting the search at bit 'offset'. This is largely based
* on Linus's ALPHA routines.
*/
static __inline__ unsigned long find_next_zero_bit(void *addr,
unsigned long size, unsigned long offset)
{
unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
unsigned long result = offset & ~31UL;
unsigned long tmp;
if (offset >= size)
return size;
size -= result;
offset &= 31UL;
if (offset) {
tmp = *(p++);
tmp |= ~0UL >> (32-offset);
if (size < 32)
goto found_first;
if (~tmp)
goto found_middle;
size -= 32;
result += 32;
}
while (size & ~31UL) {
tmp = *(p++);
if (~tmp)
goto found_middle;
result += 32;
size -= 32;
}
if (!size)
return result;
tmp = *p;
found_first:
tmp |= ~0UL >> size;
found_middle:
return result + ffz(tmp);
}
#define find_first_zero_bit(addr, size) find_next_zero_bit(((void *)addr), \
(size), 0)
/* Ported from included/linux/bitops.h */
static __inline__ int 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;
}
#define __ffs(x) (ffs(x) - 1)
/* find_next_bit - find the next set bit in a memory region
* (from asm-ppc/bitops.h)
*/
static __inline__ unsigned long find_next_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
unsigned int result = offset & ~31UL;
unsigned int tmp;
if (offset >= size)
return size;
size -= result;
offset &= 31UL;
if (offset) {
tmp = *p++;
tmp &= ~0UL << offset;
if (size < 32)
goto found_first;
if (tmp)
goto found_middle;
size -= 32;
result += 32;
}
while (size >= 32) {
tmp = *p++;
if (tmp != 0)
goto found_middle;
result += 32;
size -= 32;
}
if (!size)
return result;
tmp = *p;
found_first:
tmp &= ~0UL >> (32 - size);
if (tmp == 0UL) /* Are any bits set? */
return result + size; /* Nope. */
found_middle:
return result + __ffs(tmp);
}
#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
#ifdef __KERNEL__
/* Ported from include/linux/bitops.h */
static __inline__ int 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;
}
static inline int __fls(int x)
{
return fls(x) - 1;
}
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/lock.h>
#define minix_find_first_zero_bit(addr, size) find_next_zero_bit((addr), \
(size), 0)
#define minix_test_and_set_bit(nr, addr) test_and_set_bit((nr), \
(unsigned long *)(addr))
#define minix_set_bit(nr, addr) set_bit((nr), \
(unsigned long *)(addr))
#define minix_test_and_clear_bit(nr, addr) test_and_clear_bit((nr), \
(unsigned long *)(addr))
static inline int minix_test_bit(int nr, const volatile unsigned long *vaddr)
{
int *a = (int *)vaddr;
int mask;
a += nr >> 5;
mask = 1 << (nr & 0x1f);
return ((mask & *a) != 0);
}
#define ext2_set_bit(nr, addr) test_and_set_bit((nr) ^ 24, \
(unsigned long *)(addr))
#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 24, \
(unsigned long *)(addr))
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 24, \
(unsigned long *)(addr))
#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 24, \
(unsigned long *)(addr))
static inline int ext2_test_bit(int nr, const void *vaddr)
{
const unsigned char *p = vaddr;
return (p[nr >> 3] & (1U << (nr & 7))) != 0;
}
static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
{
const unsigned long *p = vaddr, *addr = vaddr;
int res;
if (!size)
return 0;
size = (size >> 5) + ((size & 31) > 0);
while (*p++ == ~0UL) {
if (--size == 0)
return (p - addr) << 5;
}
--p;
for (res = 0; res < 32; res++)
if (!ext2_test_bit (res, p))
break;
return (p - addr) * 32 + res;
}
static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
unsigned offset)
{
const unsigned long *addr = vaddr;
const unsigned long *p = addr + (offset >> 5);
int bit = offset & 31UL, res;
if (offset >= size)
return size;
if (bit) {
/* Look for zero in first longword */
for (res = bit; res < 32; res++)
if (!ext2_test_bit (res, p))
return (p - addr) * 32 + res;
p++;
}
/* No zero yet, search remaining full bytes for a zero */
res = ext2_find_first_zero_bit(p, size - 32 * (p - addr));
return (p - addr) * 32 + res;
}
#endif /* KERNEL */
#endif /* __CF_BITOPS__ */
|
