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190 lines
4.2 KiB
C
190 lines
4.2 KiB
C
/* bitops.h: bit operations for the Fujitsu FR-V CPUs
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*
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* For an explanation of how atomic ops work in this arch, see:
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* Documentation/fujitsu/frv/atomic-ops.txt
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_BITOPS_H
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#define _ASM_BITOPS_H
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#include <linux/compiler.h>
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#include <asm/byteorder.h>
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#include <asm/system.h>
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#include <asm/atomic.h>
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#ifdef __KERNEL__
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#include <asm-generic/bitops/ffz.h>
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/*
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* clear_bit() doesn't provide any barrier for the compiler.
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*/
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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static inline int test_and_clear_bit(int nr, volatile void *addr)
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{
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volatile unsigned long *ptr = addr;
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unsigned long mask = 1UL << (nr & 31);
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ptr += nr >> 5;
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return (atomic_test_and_ANDNOT_mask(mask, ptr) & mask) != 0;
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}
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static inline int test_and_set_bit(int nr, volatile void *addr)
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{
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volatile unsigned long *ptr = addr;
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unsigned long mask = 1UL << (nr & 31);
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ptr += nr >> 5;
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return (atomic_test_and_OR_mask(mask, ptr) & mask) != 0;
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}
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static inline int test_and_change_bit(int nr, volatile void *addr)
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{
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volatile unsigned long *ptr = addr;
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unsigned long mask = 1UL << (nr & 31);
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ptr += nr >> 5;
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return (atomic_test_and_XOR_mask(mask, ptr) & mask) != 0;
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}
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static inline void clear_bit(int nr, volatile void *addr)
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{
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test_and_clear_bit(nr, addr);
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}
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static inline void set_bit(int nr, volatile void *addr)
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{
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test_and_set_bit(nr, addr);
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}
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static inline void change_bit(int nr, volatile void * addr)
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{
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test_and_change_bit(nr, addr);
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}
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static inline void __clear_bit(int nr, volatile void * addr)
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{
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volatile unsigned long *a = addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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*a &= ~mask;
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}
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static inline void __set_bit(int nr, volatile void * addr)
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{
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volatile unsigned long *a = addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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*a |= mask;
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}
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static inline void __change_bit(int nr, volatile void *addr)
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{
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volatile unsigned long *a = addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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*a ^= mask;
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}
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static inline int __test_and_clear_bit(int nr, volatile void * addr)
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{
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volatile unsigned long *a = addr;
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int mask, retval;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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return retval;
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}
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static inline int __test_and_set_bit(int nr, volatile void * addr)
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{
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volatile unsigned long *a = addr;
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int mask, retval;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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retval = (mask & *a) != 0;
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*a |= mask;
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return retval;
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}
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static inline int __test_and_change_bit(int nr, volatile void * addr)
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{
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volatile unsigned long *a = addr;
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int mask, retval;
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a += nr >> 5;
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mask = 1 << (nr & 31);
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retval = (mask & *a) != 0;
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*a ^= mask;
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return retval;
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}
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/*
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* This routine doesn't need to be atomic.
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*/
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static inline int __constant_test_bit(int nr, const volatile void * addr)
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{
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return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
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}
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static inline int __test_bit(int nr, const volatile void * addr)
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{
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int * a = (int *) addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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return ((mask & *a) != 0);
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}
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#define test_bit(nr,addr) \
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(__builtin_constant_p(nr) ? \
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__constant_test_bit((nr),(addr)) : \
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__test_bit((nr),(addr)))
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#include <asm-generic/bitops/ffs.h>
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#include <asm-generic/bitops/__ffs.h>
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#include <asm-generic/bitops/find.h>
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/*
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* fls: find last bit set.
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*/
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#define fls(x) \
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({ \
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int bit; \
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\
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asm("scan %1,gr0,%0" : "=r"(bit) : "r"(x)); \
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\
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bit ? 33 - bit : bit; \
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})
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/ext2-non-atomic.h>
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#define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit ((nr) ^ 0x18, (addr))
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#define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr) ^ 0x18, (addr))
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#include <asm-generic/bitops/minix-le.h>
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#endif /* __KERNEL__ */
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#endif /* _ASM_BITOPS_H */
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