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/* $Id: bitops.h,v 1.11 1997/04/10 23:32:42 davem Exp $
* bitops.h: Bit string operations on the V9.
*
* Copyright 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC64_BITOPS_H
#define _SPARC64_BITOPS_H
#include <asm/asi.h> /* For the little endian spaces. */
/* These can all be exported to userland, because the atomic
* primitives used are not privileged.
*/
/* Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
* is in the highest of the four bytes and bit '31' is the high bit
* within the first byte. Sparc is BIG-Endian. Unless noted otherwise
* all bit-ops return 0 if bit was previously clear and != 0 otherwise.
*/
extern __inline__ unsigned long set_bit(unsigned long nr, void *addr)
{
unsigned long oldbit;
unsigned long temp0, temp1;
unsigned int * m = ((unsigned int *) addr) + (nr >> 5);
__asm__ __volatile__("
lduw [%4], %0
1:
andcc %0, %3, %2
bne,pn %%icc, 2f
xor %0, %3, %1
cas [%4], %0, %1
cmp %0, %1
bne,a,pn %%icc, 1b
lduw [%4], %0
2:
" : "=&r" (temp0), "=&r" (temp1), "=&r" (oldbit)
: "HIr" (1UL << (nr & 31)), "r" (m)
: "cc");
return oldbit != 0;
}
extern __inline__ unsigned long clear_bit(unsigned long nr, void *addr)
{
unsigned long oldbit;
unsigned long temp0, temp1;
unsigned int * m = ((unsigned int *) addr) + (nr >> 5);
__asm__ __volatile__("
lduw [%4], %0
1:
andcc %0, %3, %2
be,pn %%icc, 2f
xor %0, %3, %1
cas [%4], %0, %1
cmp %0, %1
bne,a,pn %%icc, 1b
lduw [%4], %0
2:
" : "=&r" (temp0), "=&r" (temp1), "=&r" (oldbit)
: "HIr" (1UL << (nr & 31)), "r" (m)
: "cc");
return oldbit != 0;
}
extern __inline__ unsigned long change_bit(unsigned long nr, void *addr)
{
unsigned long oldbit;
unsigned long temp0, temp1;
unsigned int * m = ((unsigned int *) addr) + (nr >> 5);
__asm__ __volatile__("
lduw [%4], %0
1:
and %0, %3, %2
xor %0, %3, %1
cas [%4], %0, %1
cmp %0, %1
bne,a,pn %%icc, 1b
lduw [%4], %0
" : "=&r" (temp0), "=&r" (temp1), "=&r" (oldbit)
: "HIr" (1UL << (nr & 31)), "r" (m)
: "cc");
return oldbit != 0;
}
extern __inline__ unsigned long test_bit(int nr, __const__ void *addr)
{
return 1UL & (((__const__ int *) addr)[nr >> 5] >> (nr & 31));
}
/* The easy/cheese version for now. */
extern __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, which are pretty portable BTW.
*/
extern __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) {
if (~(tmp = *(p++)))
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((addr), (size), 0)
/* Now for the ext2 filesystem bit operations and helper routines.
* Note the usage of the little endian ASI's, werd, V9 is supreme.
*/
extern __inline__ int set_le_bit(int nr,void * addr)
{
unsigned long oldbit;
unsigned long temp0, temp1;
unsigned int * m = ((unsigned int *) addr) + (nr >> 5);
__asm__ __volatile__("
lduwa [%4] %5, %0
1:
andcc %0, %3, %2
bne,pn %%icc, 2f
xor %0, %3, %1
casa [%4] %5, %0, %1
cmp %0, %1
bne,a,pn %%icc, 1b
lduwa [%4] %5, %0
2:
" : "=&r" (temp0), "=&r" (temp1), "=&r" (oldbit)
: "HIr" (1UL << (nr & 31)), "r" (m), "i" (ASI_PL)
: "cc");
return oldbit != 0;
}
extern __inline__ int clear_le_bit(int nr, void * addr)
{
unsigned long oldbit;
unsigned long temp0, temp1;
unsigned int * m = ((unsigned int *) addr) + (nr >> 5);
__asm__ __volatile__("
lduwa [%4] %5, %0
1:
andcc %0, %3, %2
be,pn %%icc, 2f
xor %0, %3, %1
casa [%4] %5, %0, %1
cmp %0, %1
bne,a,pn %%icc, 1b
lduwa [%4] %5, %0
2:
" : "=&r" (temp0), "=&r" (temp1), "=&r" (oldbit)
: "HIr" (1UL << (nr & 31)), "r" (m), "i" (ASI_PL)
: "cc");
return oldbit != 0;
}
extern __inline__ int test_le_bit(int nr, __const__ void * addr)
{
int mask;
__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
return ((mask & *ADDR) != 0);
}
#define find_first_zero_le_bit(addr, size) \
find_next_zero_le_bit((addr), (size), 0)
extern __inline__ unsigned long __swab64(unsigned long value)
{
return (((value>>56) & 0x00000000000000ff) |
((value>>40) & 0x000000000000ff00) |
((value>>24) & 0x0000000000ff0000) |
((value>>8) & 0x00000000ff000000) |
((value<<8) & 0x000000ff00000000) |
((value<<24) & 0x0000ff0000000000) |
((value<<40) & 0x00ff000000000000) |
((value<<56) & 0xff00000000000000));
}
extern __inline__ unsigned long find_next_zero_le_bit(void *addr, unsigned long size, unsigned long offset)
{
unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
unsigned long result = offset & ~63UL;
unsigned long tmp;
if (offset >= size)
return size;
size -= result;
offset &= 63UL;
if(offset) {
tmp = *(p++);
tmp |= __swab64((~0UL >> (64-offset)));
if(size < 64)
goto found_first;
if(~tmp)
goto found_middle;
size -= 64;
result += 64;
}
while(size & ~63UL) {
if(~(tmp = *(p++)))
goto found_middle;
result += 64;
size -= 64;
}
if(!size)
return result;
tmp = *p;
found_first:
return result + ffz(__swab64(tmp) | (~0UL << size));
found_middle:
return result + ffz(__swab64(tmp));
}
#ifdef __KERNEL__
#define ext2_set_bit set_le_bit
#define ext2_clear_bit clear_le_bit
#define ext2_test_bit test_le_bit
#define ext2_find_first_zero_bit find_first_zero_le_bit
#define ext2_find_next_zero_bit find_next_zero_le_bit
/* Bitmap functions for the minix filesystem. */
#define minix_set_bit(nr,addr) set_bit(nr,addr)
#define minix_clear_bit(nr,addr) clear_bit(nr,addr)
#define minix_test_bit(nr,addr) test_bit(nr,addr)
#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
#endif /* __KERNEL__ */
#endif /* defined(_SPARC64_BITOPS_H) */
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