/* $Id: bitops.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $
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/* $Id: bitops.h,v 1.1 2005-12-20 11:32:11 jcastillo Exp $
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* bitops.h: Bit string operations on the Sparc.
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* bitops.h: Bit string operations on the Sparc.
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*
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*
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* Copyright 1995, David S. Miller (davem@caip.rutgers.edu).
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* Copyright 1995, David S. Miller (davem@caip.rutgers.edu).
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*/
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*/
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#ifndef _SPARC_BITOPS_H
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#ifndef _SPARC_BITOPS_H
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#define _SPARC_BITOPS_H
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#define _SPARC_BITOPS_H
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#ifdef __KERNEL__
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#ifdef __KERNEL__
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#include <asm/system.h>
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#include <asm/system.h>
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#endif
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#endif
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#ifdef __SMP__
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#ifdef __SMP__
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#define SMPVOL volatile
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#define SMPVOL volatile
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#else
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#else
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#define SMPVOL
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#define SMPVOL
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#endif
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#endif
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/* Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
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/* Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
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* is in the highest of the four bytes and bit '31' is the high bit
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* is in the highest of the four bytes and bit '31' is the high bit
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* within the first byte. Sparc is BIG-Endian. Unless noted otherwise
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* within the first byte. Sparc is BIG-Endian. Unless noted otherwise
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* all bit-ops return 0 if bit was previously clear and != 0 otherwise.
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* all bit-ops return 0 if bit was previously clear and != 0 otherwise.
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*/
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*/
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extern __inline__ unsigned long set_bit(unsigned long nr, SMPVOL void *addr)
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extern __inline__ unsigned long set_bit(unsigned long nr, SMPVOL void *addr)
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{
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{
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int mask, flags;
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int mask, flags;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long oldbit;
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unsigned long oldbit;
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ADDR += nr >> 5;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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mask = 1 << (nr & 31);
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save_flags(flags); cli();
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save_flags(flags); cli();
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oldbit = (mask & *ADDR);
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oldbit = (mask & *ADDR);
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*ADDR |= mask;
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*ADDR |= mask;
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restore_flags(flags);
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restore_flags(flags);
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return oldbit != 0;
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return oldbit != 0;
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}
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}
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extern __inline__ unsigned long clear_bit(unsigned long nr, SMPVOL void *addr)
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extern __inline__ unsigned long clear_bit(unsigned long nr, SMPVOL void *addr)
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{
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{
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int mask, flags;
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int mask, flags;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long oldbit;
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unsigned long oldbit;
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ADDR += nr >> 5;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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mask = 1 << (nr & 31);
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save_flags(flags); cli();
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save_flags(flags); cli();
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oldbit = (mask & *ADDR);
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oldbit = (mask & *ADDR);
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*ADDR &= ~mask;
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*ADDR &= ~mask;
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restore_flags(flags);
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restore_flags(flags);
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return oldbit != 0;
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return oldbit != 0;
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}
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}
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extern __inline__ unsigned long change_bit(unsigned long nr, SMPVOL void *addr)
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extern __inline__ unsigned long change_bit(unsigned long nr, SMPVOL void *addr)
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{
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{
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int mask, flags;
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int mask, flags;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long *ADDR = (unsigned long *) addr;
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unsigned long oldbit;
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unsigned long oldbit;
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ADDR += nr >> 5;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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mask = 1 << (nr & 31);
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save_flags(flags); cli();
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save_flags(flags); cli();
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oldbit = (mask & *ADDR);
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oldbit = (mask & *ADDR);
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*ADDR ^= mask;
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*ADDR ^= mask;
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restore_flags(flags);
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restore_flags(flags);
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return oldbit != 0;
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return oldbit != 0;
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}
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}
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/* The following routine need not be atomic. */
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/* The following routine need not be atomic. */
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extern __inline__ unsigned long test_bit(int nr, const SMPVOL void *addr)
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extern __inline__ unsigned long test_bit(int nr, const SMPVOL void *addr)
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{
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{
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return ((1UL << (nr & 31)) & (((const unsigned int *) addr)[nr >> 5])) != 0;
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return ((1UL << (nr & 31)) & (((const unsigned int *) addr)[nr >> 5])) != 0;
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}
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}
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/* The easy/cheese version for now. */
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/* The easy/cheese version for now. */
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extern __inline__ unsigned long ffz(unsigned long word)
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extern __inline__ unsigned long ffz(unsigned long word)
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{
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{
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unsigned long result = 0;
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unsigned long result = 0;
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while(word & 1) {
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while(word & 1) {
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result++;
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result++;
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word >>= 1;
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word >>= 1;
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}
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}
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return result;
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return result;
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}
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}
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/* find_next_zero_bit() finds the first zero bit in a bit string of length
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/* find_next_zero_bit() finds the first zero bit in a bit string of length
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* 'size' bits, starting the search at bit 'offset'. This is largely based
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* 'size' bits, starting the search at bit 'offset'. This is largely based
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* on Linus's ALPHA routines, which are pretty portable BTW.
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* on Linus's ALPHA routines, which are pretty portable BTW.
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*/
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*/
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extern __inline__ unsigned long find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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extern __inline__ unsigned long find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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{
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{
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unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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unsigned long tmp;
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if (offset >= size)
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if (offset >= size)
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return size;
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return size;
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size -= result;
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size -= result;
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offset &= 31UL;
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offset &= 31UL;
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if (offset) {
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if (offset) {
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tmp = *(p++);
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tmp = *(p++);
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tmp |= ~0UL >> (32-offset);
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tmp |= ~0UL >> (32-offset);
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if (size < 32)
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if (size < 32)
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goto found_first;
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goto found_first;
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if (~tmp)
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if (~tmp)
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goto found_middle;
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goto found_middle;
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size -= 32;
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size -= 32;
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result += 32;
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result += 32;
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}
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}
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while (size & ~31UL) {
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while (size & ~31UL) {
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if (~(tmp = *(p++)))
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if (~(tmp = *(p++)))
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goto found_middle;
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goto found_middle;
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result += 32;
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result += 32;
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size -= 32;
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size -= 32;
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}
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}
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if (!size)
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if (!size)
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return result;
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return result;
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tmp = *p;
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tmp = *p;
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found_first:
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found_first:
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tmp |= ~0UL >> size;
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tmp |= ~0UL >> size;
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found_middle:
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found_middle:
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return result + ffz(tmp);
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return result + ffz(tmp);
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}
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}
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/* Linus sez that gcc can optimize the following correctly, we'll see if this
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/* Linus sez that gcc can optimize the following correctly, we'll see if this
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* holds on the Sparc as it does for the ALPHA.
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* holds on the Sparc as it does for the ALPHA.
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*/
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*/
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#define find_first_zero_bit(addr, size) \
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#define find_first_zero_bit(addr, size) \
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find_next_zero_bit((addr), (size), 0)
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find_next_zero_bit((addr), (size), 0)
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/* Now for the ext2 filesystem bit operations and helper routines. */
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/* Now for the ext2 filesystem bit operations and helper routines. */
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extern __inline__ int ext2_set_bit(int nr,void * addr)
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extern __inline__ int ext2_set_bit(int nr,void * addr)
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{
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{
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int mask, retval, flags;
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int mask, retval, flags;
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unsigned char *ADDR = (unsigned char *) addr;
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unsigned char *ADDR = (unsigned char *) addr;
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ADDR += nr >> 3;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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mask = 1 << (nr & 0x07);
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save_flags(flags); cli();
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save_flags(flags); cli();
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retval = (mask & *ADDR) != 0;
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retval = (mask & *ADDR) != 0;
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*ADDR |= mask;
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*ADDR |= mask;
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restore_flags(flags);
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restore_flags(flags);
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return retval;
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return retval;
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}
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}
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extern __inline__ int ext2_clear_bit(int nr, void * addr)
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extern __inline__ int ext2_clear_bit(int nr, void * addr)
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{
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{
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int mask, retval, flags;
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int mask, retval, flags;
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unsigned char *ADDR = (unsigned char *) addr;
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unsigned char *ADDR = (unsigned char *) addr;
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ADDR += nr >> 3;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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mask = 1 << (nr & 0x07);
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save_flags(flags); cli();
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save_flags(flags); cli();
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retval = (mask & *ADDR) != 0;
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retval = (mask & *ADDR) != 0;
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*ADDR &= ~mask;
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*ADDR &= ~mask;
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restore_flags(flags);
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restore_flags(flags);
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return retval;
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return retval;
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}
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}
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extern __inline__ int ext2_test_bit(int nr, const void * addr)
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extern __inline__ int ext2_test_bit(int nr, const void * addr)
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{
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{
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int mask;
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int mask;
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const unsigned char *ADDR = (const unsigned char *) addr;
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const unsigned char *ADDR = (const unsigned char *) addr;
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ADDR += nr >> 3;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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mask = 1 << (nr & 0x07);
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return ((mask & *ADDR) != 0);
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return ((mask & *ADDR) != 0);
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}
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}
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#define ext2_find_first_zero_bit(addr, size) \
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#define ext2_find_first_zero_bit(addr, size) \
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ext2_find_next_zero_bit((addr), (size), 0)
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ext2_find_next_zero_bit((addr), (size), 0)
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extern __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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extern __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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{
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{
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unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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unsigned long tmp;
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if (offset >= size)
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if (offset >= size)
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return size;
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return size;
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size -= result;
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size -= result;
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offset &= 31UL;
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offset &= 31UL;
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if(offset) {
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if(offset) {
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tmp = *(p++);
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tmp = *(p++);
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tmp |= ~0UL << (32-offset);
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tmp |= ~0UL << (32-offset);
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if(size < 32)
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if(size < 32)
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goto found_first;
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goto found_first;
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if(~tmp)
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if(~tmp)
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goto found_middle;
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goto found_middle;
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size -= 32;
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size -= 32;
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result += 32;
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result += 32;
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}
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}
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while(size & ~31UL) {
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while(size & ~31UL) {
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if(~(tmp = *(p++)))
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if(~(tmp = *(p++)))
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goto found_middle;
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goto found_middle;
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result += 32;
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result += 32;
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size -= 32;
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size -= 32;
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}
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}
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if(!size)
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if(!size)
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return result;
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return result;
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tmp = *p;
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tmp = *p;
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found_first:
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found_first:
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tmp |= ~0UL << size;
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tmp |= ~0UL << size;
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found_middle:
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found_middle:
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tmp = ((tmp>>24) | ((tmp>>8)&0xff00) | ((tmp<<8)&0xff0000) | (tmp<<24));
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tmp = ((tmp>>24) | ((tmp>>8)&0xff00) | ((tmp<<8)&0xff0000) | (tmp<<24));
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return result + ffz(tmp);
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return result + ffz(tmp);
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}
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}
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#endif /* defined(_SPARC_BITOPS_H) */
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#endif /* defined(_SPARC_BITOPS_H) */
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