linux/include/asm-m68k/bitops.h

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#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>
bitops: introduce lock ops Introduce test_and_set_bit_lock / clear_bit_unlock bitops with lock semantics. Convert all architectures to use the generic implementation. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-By: David Howells <dhowells@redhat.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Bryan Wu <bryan.wu@analog.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Matthew Wilcox <willy@debian.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Andi Kleen <ak@muc.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-18 10:06:39 +00:00
#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;
}
#endif /* __KERNEL__ */
#endif /* _M68K_BITOPS_H */