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Diffstat (limited to 'arch/mn10300/include/asm/bitops.h')
| -rw-r--r-- | arch/mn10300/include/asm/bitops.h | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/bitops.h b/arch/mn10300/include/asm/bitops.h new file mode 100644 index 0000000..0b610f4 --- /dev/null +++ b/arch/mn10300/include/asm/bitops.h @@ -0,0 +1,240 @@ +/* MN10300 bit operations + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + * + * These have to be done with inline assembly: that way the bit-setting + * is guaranteed to be atomic. All bit operations return 0 if the bit + * was cleared before the operation and != 0 if it was not. + * + * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). + */ +#ifndef __ASM_BITOPS_H +#define __ASM_BITOPS_H + +#include <asm/cpu-regs.h> + +#define smp_mb__before_clear_bit() barrier() +#define smp_mb__after_clear_bit() barrier() + +/* + * set bit + */ +#define __set_bit(nr, addr) \ +({ \ + volatile unsigned char *_a = (unsigned char *)(addr); \ + const unsigned shift = (nr) & 7; \ + _a += (nr) >> 3; \ + \ + asm volatile("bset %2,(%1) # set_bit reg" \ + : "=m"(*_a) \ + : "a"(_a), "d"(1 << shift), "m"(*_a) \ + : "memory", "cc"); \ +}) + +#define set_bit(nr, addr) __set_bit((nr), (addr)) + +/* + * clear bit + */ +#define ___clear_bit(nr, addr) \ +({ \ + volatile unsigned char *_a = (unsigned char *)(addr); \ + const unsigned shift = (nr) & 7; \ + _a += (nr) >> 3; \ + \ + asm volatile("bclr %2,(%1) # clear_bit reg" \ + : "=m"(*_a) \ + : "a"(_a), "d"(1 << shift), "m"(*_a) \ + : "memory", "cc"); \ +}) + +#define clear_bit(nr, addr) ___clear_bit((nr), (addr)) + + +static inline void __clear_bit(int nr, volatile void *addr) +{ + unsigned int *a = (unsigned int *) addr; + int mask; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + *a &= ~mask; +} + +/* + * test bit + */ +static inline int test_bit(int nr, const volatile void *addr) +{ + return 1UL & (((const unsigned int *) addr)[nr >> 5] >> (nr & 31)); +} + +/* + * change bit + */ +static inline void __change_bit(int nr, volatile void *addr) +{ + int mask; + unsigned int *a = (unsigned int *) addr; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + *a ^= mask; +} + +extern void change_bit(int nr, volatile void *addr); + +/* + * test and set bit + */ +#define __test_and_set_bit(nr,addr) \ +({ \ + volatile unsigned char *_a = (unsigned char *)(addr); \ + const unsigned shift = (nr) & 7; \ + unsigned epsw; \ + _a += (nr) >> 3; \ + \ + asm volatile("bset %3,(%2) # test_set_bit reg\n" \ + "mov epsw,%1" \ + : "=m"(*_a), "=d"(epsw) \ + : "a"(_a), "d"(1 << shift), "m"(*_a) \ + : "memory", "cc"); \ + \ + !(epsw & EPSW_FLAG_Z); \ +}) + +#define test_and_set_bit(nr, addr) __test_and_set_bit((nr), (addr)) + +/* + * test and clear bit + */ +#define __test_and_clear_bit(nr, addr) \ +({ \ + volatile unsigned char *_a = (unsigned char *)(addr); \ + const unsigned shift = (nr) & 7; \ + unsigned epsw; \ + _a += (nr) >> 3; \ + \ + asm volatile("bclr %3,(%2) # test_clear_bit reg\n" \ + "mov epsw,%1" \ + : "=m"(*_a), "=d"(epsw) \ + : "a"(_a), "d"(1 << shift), "m"(*_a) \ + : "memory", "cc"); \ + \ + !(epsw & EPSW_FLAG_Z); \ +}) + +#define test_and_clear_bit(nr, addr) __test_and_clear_bit((nr), (addr)) + +/* + * test and change bit + */ +static inline int __test_and_change_bit(int nr, volatile void *addr) +{ + int mask, retval; + unsigned int *a = (unsigned int *)addr; + + a += nr >> 5; + mask = 1 << (nr & 0x1f); + retval = (mask & *a) != 0; + *a ^= mask; + + return retval; +} + +extern int test_and_change_bit(int nr, volatile void *addr); + +#include <asm-generic/bitops/lock.h> + +#ifdef __KERNEL__ + +/** + * __ffs - find first bit set + * @x: the word to search + * + * - return 31..0 to indicate bit 31..0 most least significant bit set + * - if no bits are set in x, the result is undefined + */ +static inline __attribute__((const)) +unsigned long __ffs(unsigned long x) +{ + int bit; + asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(x & -x)); + return bit; +} + +/* + * special slimline version of fls() for calculating ilog2_u32() + * - note: no protection against n == 0 + */ +static inline __attribute__((const)) +int __ilog2_u32(u32 n) +{ + int bit; + asm("bsch %2,%0" : "=r"(bit) : "0"(0), "r"(n)); + return bit; +} + +/** + * fls - find last bit set + * @x: the word to search + * + * This is defined the same way as ffs: + * - return 32..1 to indicate bit 31..0 most significant bit set + * - return 0 to indicate no bits set + */ +static inline __attribute__((const)) +int fls(int x) +{ + return (x != 0) ? __ilog2_u32(x) + 1 : 0; +} + +/** + * __fls - find last (most-significant) set bit in a long word + * @word: the word to search + * + * Undefined if no set bit exists, so code should check against 0 first. + */ +static inline unsigned long __fls(unsigned long word) +{ + return __ilog2_u32(word); +} + +/** + * ffs - find first bit set + * @x: the word to search + * + * - return 32..1 to indicate bit 31..0 most least significant bit set + * - return 0 to indicate no bits set + */ +static inline __attribute__((const)) +int ffs(int x) +{ + /* Note: (x & -x) gives us a mask that is the least significant + * (rightmost) 1-bit of the value in x. + */ + return fls(x & -x); +} + +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/fls64.h> +#include <asm-generic/bitops/find.h> +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/hweight.h> + +#define ext2_set_bit_atomic(lock, nr, addr) \ + test_and_set_bit((nr) ^ 0x18, (addr)) +#define ext2_clear_bit_atomic(lock, nr, addr) \ + test_and_clear_bit((nr) ^ 0x18, (addr)) + +#include <asm-generic/bitops/ext2-non-atomic.h> +#include <asm-generic/bitops/minix-le.h> + +#endif /* __KERNEL__ */ +#endif /* __ASM_BITOPS_H */ |
