mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 18:36:37 +00:00
69c5ddf58a
Add ext2_find_{first,next}_bit(), which are needed for ext4. They're
derived out of the ext2_find_next_zero_bit found in the same file.
Compile tested with crosstools
[Reworked to preserve all symmetry with ext2_find_{first,next}_zero_bit()]
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=10393
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
460 lines
11 KiB
C
460 lines
11 KiB
C
#ifndef _M68K_BITOPS_H
|
|
#define _M68K_BITOPS_H
|
|
/*
|
|
* Copyright 1992, Linus Torvalds.
|
|
*
|
|
* 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 _LINUX_BITOPS_H
|
|
#error only <linux/bitops.h> can be included directly
|
|
#endif
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
/*
|
|
* Require 68020 or better.
|
|
*
|
|
* They use the standard big-endian m680x0 bit ordering.
|
|
*/
|
|
|
|
#define test_and_set_bit(nr,vaddr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_test_and_set_bit(nr, vaddr) : \
|
|
__generic_test_and_set_bit(nr, vaddr))
|
|
|
|
#define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)
|
|
|
|
static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bset %2,%1; sne %0"
|
|
: "=d" (retval), "+m" (*p)
|
|
: "di" (nr & 7));
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
|
|
: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
|
|
return retval;
|
|
}
|
|
|
|
#define set_bit(nr,vaddr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_set_bit(nr, vaddr) : \
|
|
__generic_set_bit(nr, vaddr))
|
|
|
|
#define __set_bit(nr,vaddr) set_bit(nr,vaddr)
|
|
|
|
static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
__asm__ __volatile__ ("bset %1,%0"
|
|
: "+m" (*p) : "di" (nr & 7));
|
|
}
|
|
|
|
static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
|
|
{
|
|
__asm__ __volatile__ ("bfset %1{%0:#1}"
|
|
: : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
}
|
|
|
|
#define test_and_clear_bit(nr,vaddr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_test_and_clear_bit(nr, vaddr) : \
|
|
__generic_test_and_clear_bit(nr, vaddr))
|
|
|
|
#define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)
|
|
|
|
static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bclr %2,%1; sne %0"
|
|
: "=d" (retval), "+m" (*p)
|
|
: "di" (nr & 7));
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
|
|
: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* 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_clear_bit(nr, vaddr) : \
|
|
__generic_clear_bit(nr, vaddr))
|
|
#define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)
|
|
|
|
static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
__asm__ __volatile__ ("bclr %1,%0"
|
|
: "+m" (*p) : "di" (nr & 7));
|
|
}
|
|
|
|
static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
|
|
{
|
|
__asm__ __volatile__ ("bfclr %1{%0:#1}"
|
|
: : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
}
|
|
|
|
#define test_and_change_bit(nr,vaddr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_test_and_change_bit(nr, vaddr) : \
|
|
__generic_test_and_change_bit(nr, vaddr))
|
|
|
|
#define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
|
|
#define __change_bit(nr,vaddr) change_bit(nr,vaddr)
|
|
|
|
static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bchg %2,%1; sne %0"
|
|
: "=d" (retval), "+m" (*p)
|
|
: "di" (nr & 7));
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char retval;
|
|
|
|
__asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
|
|
: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
|
|
return retval;
|
|
}
|
|
|
|
#define change_bit(nr,vaddr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_change_bit(nr, vaddr) : \
|
|
__generic_change_bit(nr, vaddr))
|
|
|
|
static inline void __constant_change_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
char *p = (char *)vaddr + (nr ^ 31) / 8;
|
|
__asm__ __volatile__ ("bchg %1,%0"
|
|
: "+m" (*p) : "di" (nr & 7));
|
|
}
|
|
|
|
static inline void __generic_change_bit(int nr, unsigned long *vaddr)
|
|
{
|
|
__asm__ __volatile__ ("bfchg %1{%0:#1}"
|
|
: : "d" (nr^31), "o" (*vaddr) : "memory");
|
|
}
|
|
|
|
static inline int test_bit(int nr, const unsigned long *vaddr)
|
|
{
|
|
return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
|
|
}
|
|
|
|
static inline int find_first_zero_bit(const unsigned long *vaddr,
|
|
unsigned size)
|
|
{
|
|
const unsigned long *p = vaddr;
|
|
int res = 32;
|
|
unsigned long num;
|
|
|
|
if (!size)
|
|
return 0;
|
|
|
|
size = (size + 31) >> 5;
|
|
while (!(num = ~*p++)) {
|
|
if (!--size)
|
|
goto out;
|
|
}
|
|
|
|
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
|
|
: "=d" (res) : "d" (num & -num));
|
|
res ^= 31;
|
|
out:
|
|
return ((long)p - (long)vaddr - 4) * 8 + res;
|
|
}
|
|
|
|
static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
|
|
int offset)
|
|
{
|
|
const unsigned long *p = vaddr + (offset >> 5);
|
|
int bit = offset & 31UL, res;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
|
|
if (bit) {
|
|
unsigned long num = ~*p++ & (~0UL << bit);
|
|
offset -= bit;
|
|
|
|
/* Look for zero in first longword */
|
|
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
|
|
: "=d" (res) : "d" (num & -num));
|
|
if (res < 32)
|
|
return offset + (res ^ 31);
|
|
offset += 32;
|
|
}
|
|
/* No zero yet, search remaining full bytes for a zero */
|
|
res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
|
|
return offset + res;
|
|
}
|
|
|
|
static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
|
|
{
|
|
const unsigned long *p = vaddr;
|
|
int res = 32;
|
|
unsigned long num;
|
|
|
|
if (!size)
|
|
return 0;
|
|
|
|
size = (size + 31) >> 5;
|
|
while (!(num = *p++)) {
|
|
if (!--size)
|
|
goto out;
|
|
}
|
|
|
|
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
|
|
: "=d" (res) : "d" (num & -num));
|
|
res ^= 31;
|
|
out:
|
|
return ((long)p - (long)vaddr - 4) * 8 + res;
|
|
}
|
|
|
|
static inline int find_next_bit(const unsigned long *vaddr, int size,
|
|
int offset)
|
|
{
|
|
const unsigned long *p = vaddr + (offset >> 5);
|
|
int bit = offset & 31UL, res;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
|
|
if (bit) {
|
|
unsigned long num = *p++ & (~0UL << bit);
|
|
offset -= bit;
|
|
|
|
/* Look for one in first longword */
|
|
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
|
|
: "=d" (res) : "d" (num & -num));
|
|
if (res < 32)
|
|
return offset + (res ^ 31);
|
|
offset += 32;
|
|
}
|
|
/* No one yet, search remaining full bytes for a one */
|
|
res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
|
|
return offset + res;
|
|
}
|
|
|
|
/*
|
|
* ffz = Find First Zero in word. Undefined if no zero exists,
|
|
* so code should check against ~0UL first..
|
|
*/
|
|
static inline unsigned long ffz(unsigned long word)
|
|
{
|
|
int res;
|
|
|
|
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
|
|
: "=d" (res) : "d" (~word & -~word));
|
|
return res ^ 31;
|
|
}
|
|
|
|
#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).
|
|
*/
|
|
|
|
static inline int ffs(int x)
|
|
{
|
|
int cnt;
|
|
|
|
asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
|
|
|
|
return 32 - cnt;
|
|
}
|
|
#define __ffs(x) (ffs(x) - 1)
|
|
|
|
/*
|
|
* fls: find last bit set.
|
|
*/
|
|
|
|
static inline int fls(int x)
|
|
{
|
|
int cnt;
|
|
|
|
asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));
|
|
|
|
return 32 - cnt;
|
|
}
|
|
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/lock.h>
|
|
|
|
/* Bitmap functions for the minix filesystem */
|
|
|
|
static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
|
|
{
|
|
const unsigned short *p = vaddr, *addr = vaddr;
|
|
int res;
|
|
unsigned short num;
|
|
|
|
if (!size)
|
|
return 0;
|
|
|
|
size = (size >> 4) + ((size & 15) > 0);
|
|
while (*p++ == 0xffff)
|
|
{
|
|
if (--size == 0)
|
|
return (p - addr) << 4;
|
|
}
|
|
|
|
num = ~*--p;
|
|
__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
|
|
: "=d" (res) : "d" (num & -num));
|
|
return ((p - addr) << 4) + (res ^ 31);
|
|
}
|
|
|
|
#define minix_test_and_set_bit(nr, addr) __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
|
|
#define minix_set_bit(nr,addr) __set_bit((nr) ^ 16, (unsigned long *)(addr))
|
|
#define minix_test_and_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
|
|
|
|
static inline int minix_test_bit(int nr, const void *vaddr)
|
|
{
|
|
const unsigned short *p = vaddr;
|
|
return (p[nr >> 4] & (1U << (nr & 15))) != 0;
|
|
}
|
|
|
|
/* Bitmap functions for the ext2 filesystem. */
|
|
|
|
#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;
|
|
}
|
|
|
|
static inline int ext2_find_first_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_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 one in first longword */
|
|
for (res = bit; res < 32; res++)
|
|
if (ext2_test_bit(res, p))
|
|
return (p - addr) * 32 + res;
|
|
p++;
|
|
}
|
|
/* No set bit yet, search remaining full bytes for a set bit */
|
|
res = ext2_find_first_bit(p, size - 32 * (p - addr));
|
|
return (p - addr) * 32 + res;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _M68K_BITOPS_H */
|