X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-x86%2Fbitops.h;h=b81a4d4d333787e4c9e8b69cb74fd190f09c4e69;hb=cf867ac375cea7c7a834eaddaf373e2662d9e260;hp=7a76555b676a34d0c79bbf84c6f454ccd8131599;hpb=709f744f18ebc3a810d29c8d5502bf20c3cecc70;p=linux-2.6 diff --git a/include/asm-x86/bitops.h b/include/asm-x86/bitops.h index 7a76555b67..b81a4d4d33 100644 --- a/include/asm-x86/bitops.h +++ b/include/asm-x86/bitops.h @@ -23,13 +23,13 @@ #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1) /* Technically wrong, but this avoids compilation errors on some gcc versions. */ -#define ADDR "=m" (*(volatile long *) addr) -#define BIT_ADDR "=m" (((volatile int *) addr)[nr >> 5]) +#define ADDR "=m" (*(volatile long *)addr) +#define BIT_ADDR "=m" (((volatile int *)addr)[nr >> 5]) #else #define ADDR "+m" (*(volatile long *) addr) -#define BIT_ADDR "+m" (((volatile int *) addr)[nr >> 5]) +#define BIT_ADDR "+m" (((volatile int *)addr)[nr >> 5]) #endif -#define BASE_ADDR "m" (*(volatile int *) addr) +#define BASE_ADDR "m" (*(volatile int *)addr) /** * set_bit - Atomically set a bit in memory @@ -48,9 +48,7 @@ */ static inline void set_bit(int nr, volatile void *addr) { - asm volatile(LOCK_PREFIX "bts %1,%0" - : ADDR - : "Ir" (nr) : "memory"); + asm volatile(LOCK_PREFIX "bts %1,%0" : ADDR : "Ir" (nr) : "memory"); } /** @@ -64,12 +62,9 @@ static inline void set_bit(int nr, volatile void *addr) */ static inline void __set_bit(int nr, volatile void *addr) { - asm volatile("bts %1,%0" - : ADDR - : "Ir" (nr) : "memory"); + asm volatile("bts %1,%0" : ADDR : "Ir" (nr) : "memory"); } - /** * clear_bit - Clears a bit in memory * @nr: Bit to clear @@ -82,8 +77,7 @@ static inline void __set_bit(int nr, volatile void *addr) */ static inline void clear_bit(int nr, volatile void *addr) { - asm volatile(LOCK_PREFIX "btr %1,%2" - : BIT_ADDR : "Ir" (nr), BASE_ADDR); + asm volatile(LOCK_PREFIX "btr %1,%2" : BIT_ADDR : "Ir" (nr), BASE_ADDR); } /* @@ -151,8 +145,7 @@ static inline void __change_bit(int nr, volatile void *addr) */ static inline void change_bit(int nr, volatile void *addr) { - asm volatile(LOCK_PREFIX "btc %1,%2" - : BIT_ADDR : "Ir" (nr), BASE_ADDR); + asm volatile(LOCK_PREFIX "btc %1,%2" : BIT_ADDR : "Ir" (nr), BASE_ADDR); } /** @@ -168,9 +161,7 @@ static inline int test_and_set_bit(int nr, volatile void *addr) int oldbit; asm volatile(LOCK_PREFIX "bts %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); + "sbb %0,%0" : "=r" (oldbit), ADDR : "Ir" (nr) : "memory"); return oldbit; } @@ -202,8 +193,7 @@ static inline int __test_and_set_bit(int nr, volatile void *addr) asm volatile("bts %2,%3\n\t" "sbb %0,%0" - : "=r" (oldbit), BIT_ADDR - : "Ir" (nr), BASE_ADDR); + : "=r" (oldbit), BIT_ADDR : "Ir" (nr), BASE_ADDR); return oldbit; } @@ -221,8 +211,7 @@ static inline int test_and_clear_bit(int nr, volatile void *addr) asm volatile(LOCK_PREFIX "btr %2,%1\n\t" "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); + : "=r" (oldbit), ADDR : "Ir" (nr) : "memory"); return oldbit; } @@ -242,8 +231,7 @@ static inline int __test_and_clear_bit(int nr, volatile void *addr) asm volatile("btr %2,%3\n\t" "sbb %0,%0" - : "=r" (oldbit), BIT_ADDR - : "Ir" (nr), BASE_ADDR); + : "=r" (oldbit), BIT_ADDR : "Ir" (nr), BASE_ADDR); return oldbit; } @@ -254,8 +242,7 @@ static inline int __test_and_change_bit(int nr, volatile void *addr) asm volatile("btc %2,%3\n\t" "sbb %0,%0" - : "=r" (oldbit), BIT_ADDR - : "Ir" (nr), BASE_ADDR); + : "=r" (oldbit), BIT_ADDR : "Ir" (nr), BASE_ADDR); return oldbit; } @@ -274,8 +261,7 @@ static inline int test_and_change_bit(int nr, volatile void *addr) asm volatile(LOCK_PREFIX "btc %2,%1\n\t" "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); + : "=r" (oldbit), ADDR : "Ir" (nr) : "memory"); return oldbit; } @@ -308,19 +294,145 @@ static inline int variable_test_bit(int nr, volatile const void *addr) static int test_bit(int nr, const volatile unsigned long *addr); #endif -#define test_bit(nr,addr) \ - (__builtin_constant_p(nr) ? \ - constant_test_bit((nr),(addr)) : \ - variable_test_bit((nr),(addr))) +#define test_bit(nr, addr) \ + (__builtin_constant_p((nr)) \ + ? constant_test_bit((nr), (addr)) \ + : variable_test_bit((nr), (addr))) + +/** + * __ffs - find first set bit in word + * @word: The word to search + * + * Undefined if no bit exists, so code should check against 0 first. + */ +static inline unsigned long __ffs(unsigned long word) +{ + asm("bsf %1,%0" + : "=r" (word) + : "rm" (word)); + return word; +} + +/** + * ffz - find first zero bit in word + * @word: The word to search + * + * Undefined if no zero exists, so code should check against ~0UL first. + */ +static inline unsigned long ffz(unsigned long word) +{ + asm("bsf %1,%0" + : "=r" (word) + : "r" (~word)); + return word; +} + +/* + * __fls: find last set bit in word + * @word: The word to search + * + * Undefined if no zero exists, so code should check against ~0UL first. + */ +static inline unsigned long __fls(unsigned long word) +{ + asm("bsr %1,%0" + : "=r" (word) + : "rm" (word)); + return word; +} + +#ifdef __KERNEL__ +/** + * ffs - find first set bit in word + * @x: the word to search + * + * This is defined the same way as the libc and compiler builtin ffs + * routines, therefore differs in spirit from the other bitops. + * + * ffs(value) returns 0 if value is 0 or the position of the first + * set bit if value is nonzero. The first (least significant) bit + * is at position 1. + */ +static inline int ffs(int x) +{ + int r; +#ifdef CONFIG_X86_CMOV + asm("bsfl %1,%0\n\t" + "cmovzl %2,%0" + : "=r" (r) : "rm" (x), "r" (-1)); +#else + asm("bsfl %1,%0\n\t" + "jnz 1f\n\t" + "movl $-1,%0\n" + "1:" : "=r" (r) : "rm" (x)); +#endif + return r + 1; +} + +/** + * fls - find last set bit in word + * @x: the word to search + * + * This is defined in a similar way as the libc and compiler builtin + * ffs, but returns the position of the most significant set bit. + * + * fls(value) returns 0 if value is 0 or the position of the last + * set bit if value is nonzero. The last (most significant) bit is + * at position 32. + */ +static inline int fls(int x) +{ + int r; +#ifdef CONFIG_X86_CMOV + asm("bsrl %1,%0\n\t" + "cmovzl %2,%0" + : "=&r" (r) : "rm" (x), "rm" (-1)); +#else + asm("bsrl %1,%0\n\t" + "jnz 1f\n\t" + "movl $-1,%0\n" + "1:" : "=r" (r) : "rm" (x)); +#endif + return r + 1; +} +#endif /* __KERNEL__ */ #undef BASE_ADDR #undef BIT_ADDR #undef ADDR -#ifdef CONFIG_X86_32 -# include "bitops_32.h" -#else -# include "bitops_64.h" -#endif +static inline void set_bit_string(unsigned long *bitmap, + unsigned long i, int len) +{ + unsigned long end = i + len; + while (i < end) { + __set_bit(i, bitmap); + i++; + } +} + +#ifdef __KERNEL__ + +#include + +#define ARCH_HAS_FAST_MULTIPLIER 1 + +#include + +#endif /* __KERNEL__ */ + +#include + +#ifdef __KERNEL__ + +#include + +#define ext2_set_bit_atomic(lock, nr, addr) \ + test_and_set_bit((nr), (unsigned long *)(addr)) +#define ext2_clear_bit_atomic(lock, nr, addr) \ + test_and_clear_bit((nr), (unsigned long *)(addr)) + +#include +#endif /* __KERNEL__ */ #endif /* _ASM_X86_BITOPS_H */