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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.
*/
/*
* 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))
extern __inline__ int __constant_test_and_set_bit(int nr,void * vaddr)
{
char retval;
__asm__ __volatile__ ("bset %1,%2; sne %0"
: "=d" (retval)
: "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
return retval;
}
extern __inline__ int __generic_test_and_set_bit(int nr,void * vaddr)
{
char retval;
__asm__ __volatile__ ("bfset %2@{%1:#1}; sne %0"
: "=d" (retval) : "d" (nr^31), "a" (vaddr));
return retval;
}
#define set_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_set_bit(nr, vaddr) : \
__generic_set_bit(nr, vaddr))
extern __inline__ void __constant_set_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bset %0,%1"
: : "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
}
extern __inline__ void __generic_set_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bfset %1@{%0:#1}"
: : "d" (nr^31), "a" (vaddr));
}
#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))
extern __inline__ int __constant_test_and_clear_bit(int nr, void * vaddr)
{
char retval;
__asm__ __volatile__ ("bclr %1,%2; sne %0"
: "=d" (retval)
: "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
return retval;
}
extern __inline__ int __generic_test_and_clear_bit(int nr, void * vaddr)
{
char retval;
__asm__ __volatile__ ("bfclr %2@{%1:#1}; sne %0"
: "=d" (retval) : "d" (nr^31), "a" (vaddr));
return retval;
}
#define clear_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_clear_bit(nr, vaddr) : \
__generic_clear_bit(nr, vaddr))
extern __inline__ void __constant_clear_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bclr %0,%1"
: : "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
}
extern __inline__ void __generic_clear_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bfclr %1@{%0:#1}"
: : "d" (nr^31), "a" (vaddr));
}
#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))
extern __inline__ int __constant_test_and_change_bit(int nr, void * vaddr)
{
char retval;
__asm__ __volatile__ ("bchg %1,%2; sne %0"
: "=d" (retval)
: "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
return retval;
}
extern __inline__ int __generic_test_and_change_bit(int nr, void * vaddr)
{
char retval;
__asm__ __volatile__ ("bfchg %2@{%1:#1}; sne %0"
: "=d" (retval) : "d" (nr^31), "a" (vaddr));
return retval;
}
#define change_bit(nr,vaddr) \
(__builtin_constant_p(nr) ? \
__constant_change_bit(nr, vaddr) : \
__generic_change_bit(nr, vaddr))
extern __inline__ void __constant_change_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bchg %0,%1"
: : "di" (nr & 7), "m" (((char *)vaddr)[(nr^31) >> 3]));
}
extern __inline__ void __generic_change_bit(int nr, void * vaddr)
{
__asm__ __volatile__ ("bfchg %1@{%0:#1}"
: : "d" (nr^31), "a" (vaddr));
}
extern __inline__ int test_bit(int nr, const void * vaddr)
{
return ((1UL << (nr & 31)) & (((const unsigned int *) vaddr)[nr >> 5])) != 0;
}
extern __inline__ int find_first_zero_bit(void * vaddr, unsigned size)
{
unsigned long *p = vaddr, *addr = vaddr;
unsigned long allones = ~0UL;
int res;
unsigned long num;
if (!size)
return 0;
size = (size >> 5) + ((size & 31) > 0);
while (*p++ == allones)
{
if (--size == 0)
return (p - addr) << 5;
}
num = ~*--p;
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
: "=d" (res) : "d" (num & -num));
return ((p - addr) << 5) + (res ^ 31);
}
extern __inline__ int find_next_zero_bit (void *vaddr, int size,
int offset)
{
unsigned long *addr = vaddr;
unsigned long *p = addr + (offset >> 5);
int set = 0, bit = offset & 31UL, res;
if (offset >= size)
return size;
if (bit) {
unsigned long num = ~*p & (~0UL << bit);
/* Look for zero in first longword */
__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
: "=d" (res) : "d" (num & -num));
if (res < 32)
return (offset & ~31UL) + (res ^ 31);
set = 32 - bit;
p++;
}
/* No zero yet, search remaining full bytes for a zero */
res = find_first_zero_bit (p, size - 32 * (p - addr));
return (offset + set + res);
}
/*
* ffz = Find First Zero in word. Undefined if no zero exists,
* so code should check against ~0UL first..
*/
extern __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).
*/
extern __inline__ int ffs(int x)
{
int cnt;
asm ("bfffo %1{#0:#0}" : "=d" (cnt) : "dm" (x & -x));
return 32 - cnt;
}
/*
* hweightN: returns the hamming weight (i.e. the number
* of bits set) of a N-bit word
*/
#define hweight32(x) generic_hweight32(x)
#define hweight16(x) generic_hweight16(x)
#define hweight8(x) generic_hweight8(x)
/* Bitmap functions for the minix filesystem */
extern __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);
}
extern __inline__ int
minix_set_bit (int nr, void *vaddr)
{
char retval;
__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
: "=d" (retval) : "d" (nr^15), "m" (*(char *)vaddr));
return retval;
}
extern __inline__ int
minix_clear_bit (int nr, void *vaddr)
{
char retval;
__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
: "=d" (retval) : "d" (nr^15), "m" (*(char *) vaddr));
return retval;
}
extern __inline__ int
minix_test_bit (int nr, const void *vaddr)
{
return ((1U << (nr & 15)) & (((const unsigned short *) vaddr)[nr >> 4])) != 0;
}
/* Bitmap functions for the ext2 filesystem. */
extern __inline__ int
ext2_set_bit (int nr, void *vaddr)
{
char retval;
__asm__ __volatile__ ("bfset %2{%1,#1}; sne %0"
: "=d" (retval) : "d" (nr^7), "m" (*(char *) vaddr));
return retval;
}
extern __inline__ int
ext2_clear_bit (int nr, void *vaddr)
{
char retval;
__asm__ __volatile__ ("bfclr %2{%1,#1}; sne %0"
: "=d" (retval) : "d" (nr^7), "m" (*(char *) vaddr));
return retval;
}
extern __inline__ int
ext2_test_bit (int nr, const void *vaddr)
{
return ((1U << (nr & 7)) & (((const unsigned char *) vaddr)[nr >> 3])) != 0;
}
extern __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;
}
extern __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 */
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