|  | #ifndef _ALPHA_BITOPS_H | 
|  | #define _ALPHA_BITOPS_H | 
|  |  | 
|  | #ifndef _LINUX_BITOPS_H | 
|  | #error only <linux/bitops.h> can be included directly | 
|  | #endif | 
|  |  | 
|  | #include <asm/compiler.h> | 
|  | #include <asm/barrier.h> | 
|  |  | 
|  | /* | 
|  | * Copyright 1994, Linus Torvalds. | 
|  | */ | 
|  |  | 
|  | /* | 
|  | * 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. | 
|  | * | 
|  | * To get proper branch prediction for the main line, we must branch | 
|  | * forward to code at the end of this object's .text section, then | 
|  | * branch back to restart the operation. | 
|  | * | 
|  | * bit 0 is the LSB of addr; bit 64 is the LSB of (addr+1). | 
|  | */ | 
|  |  | 
|  | static inline void | 
|  | set_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | "1:	ldl_l %0,%3\n" | 
|  | "	bis %0,%2,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,2f\n" | 
|  | ".subsection 2\n" | 
|  | "2:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m)); | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static inline void | 
|  | __set_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | *m |= 1 << (nr & 31); | 
|  | } | 
|  |  | 
|  | #define smp_mb__before_clear_bit()	smp_mb() | 
|  | #define smp_mb__after_clear_bit()	smp_mb() | 
|  |  | 
|  | static inline void | 
|  | clear_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | "1:	ldl_l %0,%3\n" | 
|  | "	bic %0,%2,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,2f\n" | 
|  | ".subsection 2\n" | 
|  | "2:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m)); | 
|  | } | 
|  |  | 
|  | static inline void | 
|  | clear_bit_unlock(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | smp_mb(); | 
|  | clear_bit(nr, addr); | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static __inline__ void | 
|  | __clear_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | *m &= ~(1 << (nr & 31)); | 
|  | } | 
|  |  | 
|  | static inline void | 
|  | __clear_bit_unlock(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | smp_mb(); | 
|  | __clear_bit(nr, addr); | 
|  | } | 
|  |  | 
|  | static inline void | 
|  | change_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | "1:	ldl_l %0,%3\n" | 
|  | "	xor %0,%2,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,2f\n" | 
|  | ".subsection 2\n" | 
|  | "2:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m)); | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static __inline__ void | 
|  | __change_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | *m ^= 1 << (nr & 31); | 
|  | } | 
|  |  | 
|  | static inline int | 
|  | test_and_set_bit(unsigned long nr, volatile void *addr) | 
|  | { | 
|  | unsigned long oldbit; | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | "1:	ldl_l %0,%4\n" | 
|  | "	and %0,%3,%2\n" | 
|  | "	bne %2,2f\n" | 
|  | "	xor %0,%3,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,3f\n" | 
|  | "2:\n" | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | ".subsection 2\n" | 
|  | "3:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m), "=&r" (oldbit) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory"); | 
|  |  | 
|  | return oldbit != 0; | 
|  | } | 
|  |  | 
|  | static inline int | 
|  | test_and_set_bit_lock(unsigned long nr, volatile void *addr) | 
|  | { | 
|  | unsigned long oldbit; | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | "1:	ldl_l %0,%4\n" | 
|  | "	and %0,%3,%2\n" | 
|  | "	bne %2,2f\n" | 
|  | "	xor %0,%3,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,3f\n" | 
|  | "2:\n" | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | ".subsection 2\n" | 
|  | "3:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m), "=&r" (oldbit) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory"); | 
|  |  | 
|  | return oldbit != 0; | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static inline int | 
|  | __test_and_set_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long mask = 1 << (nr & 0x1f); | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  | int old = *m; | 
|  |  | 
|  | *m = old | mask; | 
|  | return (old & mask) != 0; | 
|  | } | 
|  |  | 
|  | static inline int | 
|  | test_and_clear_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long oldbit; | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | "1:	ldl_l %0,%4\n" | 
|  | "	and %0,%3,%2\n" | 
|  | "	beq %2,2f\n" | 
|  | "	xor %0,%3,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,3f\n" | 
|  | "2:\n" | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | ".subsection 2\n" | 
|  | "3:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m), "=&r" (oldbit) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory"); | 
|  |  | 
|  | return oldbit != 0; | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static inline int | 
|  | __test_and_clear_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long mask = 1 << (nr & 0x1f); | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  | int old = *m; | 
|  |  | 
|  | *m = old & ~mask; | 
|  | return (old & mask) != 0; | 
|  | } | 
|  |  | 
|  | static inline int | 
|  | test_and_change_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long oldbit; | 
|  | unsigned long temp; | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  |  | 
|  | __asm__ __volatile__( | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | "1:	ldl_l %0,%4\n" | 
|  | "	and %0,%3,%2\n" | 
|  | "	xor %0,%3,%0\n" | 
|  | "	stl_c %0,%1\n" | 
|  | "	beq %0,3f\n" | 
|  | #ifdef CONFIG_SMP | 
|  | "	mb\n" | 
|  | #endif | 
|  | ".subsection 2\n" | 
|  | "3:	br 1b\n" | 
|  | ".previous" | 
|  | :"=&r" (temp), "=m" (*m), "=&r" (oldbit) | 
|  | :"Ir" (1UL << (nr & 31)), "m" (*m) : "memory"); | 
|  |  | 
|  | return oldbit != 0; | 
|  | } | 
|  |  | 
|  | /* | 
|  | * WARNING: non atomic version. | 
|  | */ | 
|  | static __inline__ int | 
|  | __test_and_change_bit(unsigned long nr, volatile void * addr) | 
|  | { | 
|  | unsigned long mask = 1 << (nr & 0x1f); | 
|  | int *m = ((int *) addr) + (nr >> 5); | 
|  | int old = *m; | 
|  |  | 
|  | *m = old ^ mask; | 
|  | return (old & mask) != 0; | 
|  | } | 
|  |  | 
|  | static inline int | 
|  | test_bit(int nr, const volatile void * addr) | 
|  | { | 
|  | return (1UL & (((const int *) addr)[nr >> 5] >> (nr & 31))) != 0UL; | 
|  | } | 
|  |  | 
|  | /* | 
|  | * ffz = Find First Zero in word. Undefined if no zero exists, | 
|  | * so code should check against ~0UL first.. | 
|  | * | 
|  | * Do a binary search on the bits.  Due to the nature of large | 
|  | * constants on the alpha, it is worthwhile to split the search. | 
|  | */ | 
|  | static inline unsigned long ffz_b(unsigned long x) | 
|  | { | 
|  | unsigned long sum, x1, x2, x4; | 
|  |  | 
|  | x = ~x & -~x;		/* set first 0 bit, clear others */ | 
|  | x1 = x & 0xAA; | 
|  | x2 = x & 0xCC; | 
|  | x4 = x & 0xF0; | 
|  | sum = x2 ? 2 : 0; | 
|  | sum += (x4 != 0) * 4; | 
|  | sum += (x1 != 0); | 
|  |  | 
|  | return sum; | 
|  | } | 
|  |  | 
|  | static inline unsigned long ffz(unsigned long word) | 
|  | { | 
|  | #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) | 
|  | /* Whee.  EV67 can calculate it directly.  */ | 
|  | return __kernel_cttz(~word); | 
|  | #else | 
|  | unsigned long bits, qofs, bofs; | 
|  |  | 
|  | bits = __kernel_cmpbge(word, ~0UL); | 
|  | qofs = ffz_b(bits); | 
|  | bits = __kernel_extbl(word, qofs); | 
|  | bofs = ffz_b(bits); | 
|  |  | 
|  | return qofs*8 + bofs; | 
|  | #endif | 
|  | } | 
|  |  | 
|  | /* | 
|  | * __ffs = Find First set bit in word.  Undefined if no set bit exists. | 
|  | */ | 
|  | static inline unsigned long __ffs(unsigned long word) | 
|  | { | 
|  | #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) | 
|  | /* Whee.  EV67 can calculate it directly.  */ | 
|  | return __kernel_cttz(word); | 
|  | #else | 
|  | unsigned long bits, qofs, bofs; | 
|  |  | 
|  | bits = __kernel_cmpbge(0, word); | 
|  | qofs = ffz_b(bits); | 
|  | bits = __kernel_extbl(word, qofs); | 
|  | bofs = ffz_b(~bits); | 
|  |  | 
|  | return qofs*8 + bofs; | 
|  | #endif | 
|  | } | 
|  |  | 
|  | #ifdef __KERNEL__ | 
|  |  | 
|  | /* | 
|  | * ffs: find first bit set. This is defined the same way as | 
|  | * the libc and compiler builtin ffs routines, therefore | 
|  | * differs in spirit from the above __ffs. | 
|  | */ | 
|  |  | 
|  | static inline int ffs(int word) | 
|  | { | 
|  | int result = __ffs(word) + 1; | 
|  | return word ? result : 0; | 
|  | } | 
|  |  | 
|  | /* | 
|  | * fls: find last bit set. | 
|  | */ | 
|  | #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) | 
|  | static inline int fls64(unsigned long word) | 
|  | { | 
|  | return 64 - __kernel_ctlz(word); | 
|  | } | 
|  | #else | 
|  | extern const unsigned char __flsm1_tab[256]; | 
|  |  | 
|  | static inline int fls64(unsigned long x) | 
|  | { | 
|  | unsigned long t, a, r; | 
|  |  | 
|  | t = __kernel_cmpbge (x, 0x0101010101010101UL); | 
|  | a = __flsm1_tab[t]; | 
|  | t = __kernel_extbl (x, a); | 
|  | r = a*8 + __flsm1_tab[t] + (x != 0); | 
|  |  | 
|  | return r; | 
|  | } | 
|  | #endif | 
|  |  | 
|  | static inline int fls(int x) | 
|  | { | 
|  | return fls64((unsigned int) x); | 
|  | } | 
|  |  | 
|  | /* | 
|  | * hweightN: returns the hamming weight (i.e. the number | 
|  | * of bits set) of a N-bit word | 
|  | */ | 
|  |  | 
|  | #if defined(CONFIG_ALPHA_EV6) && defined(CONFIG_ALPHA_EV67) | 
|  | /* Whee.  EV67 can calculate it directly.  */ | 
|  | static inline unsigned long hweight64(unsigned long w) | 
|  | { | 
|  | return __kernel_ctpop(w); | 
|  | } | 
|  |  | 
|  | static inline unsigned int hweight32(unsigned int w) | 
|  | { | 
|  | return hweight64(w); | 
|  | } | 
|  |  | 
|  | static inline unsigned int hweight16(unsigned int w) | 
|  | { | 
|  | return hweight64(w & 0xffff); | 
|  | } | 
|  |  | 
|  | static inline unsigned int hweight8(unsigned int w) | 
|  | { | 
|  | return hweight64(w & 0xff); | 
|  | } | 
|  | #else | 
|  | #include <asm-generic/bitops/hweight.h> | 
|  | #endif | 
|  |  | 
|  | #endif /* __KERNEL__ */ | 
|  |  | 
|  | #include <asm-generic/bitops/find.h> | 
|  |  | 
|  | #ifdef __KERNEL__ | 
|  |  | 
|  | /* | 
|  | * Every architecture must define this function. It's the fastest | 
|  | * way of searching a 140-bit bitmap where the first 100 bits are | 
|  | * unlikely to be set. It's guaranteed that at least one of the 140 | 
|  | * bits is set. | 
|  | */ | 
|  | static inline unsigned long | 
|  | sched_find_first_bit(unsigned long b[3]) | 
|  | { | 
|  | unsigned long b0 = b[0], b1 = b[1], b2 = b[2]; | 
|  | unsigned long ofs; | 
|  |  | 
|  | ofs = (b1 ? 64 : 128); | 
|  | b1 = (b1 ? b1 : b2); | 
|  | ofs = (b0 ? 0 : ofs); | 
|  | b0 = (b0 ? b0 : b1); | 
|  |  | 
|  | return __ffs(b0) + ofs; | 
|  | } | 
|  |  | 
|  | #include <asm-generic/bitops/ext2-non-atomic.h> | 
|  |  | 
|  | #define ext2_set_bit_atomic(l,n,a)   test_and_set_bit(n,a) | 
|  | #define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a) | 
|  |  | 
|  | #include <asm-generic/bitops/minix.h> | 
|  |  | 
|  | #endif /* __KERNEL__ */ | 
|  |  | 
|  | #endif /* _ALPHA_BITOPS_H */ |