diff options
Diffstat (limited to 'include/asm-parisc/bitops.h')
| -rw-r--r-- | include/asm-parisc/bitops.h | 494 |
1 files changed, 0 insertions, 494 deletions
diff --git a/include/asm-parisc/bitops.h b/include/asm-parisc/bitops.h deleted file mode 100644 index 55b98c67fd8..00000000000 --- a/include/asm-parisc/bitops.h +++ /dev/null @@ -1,494 +0,0 @@ -#ifndef _PARISC_BITOPS_H -#define _PARISC_BITOPS_H - -#include <linux/compiler.h> -#include <asm/types.h> /* for BITS_PER_LONG/SHIFT_PER_LONG */ -#include <asm/byteorder.h> -#include <asm/atomic.h> - -/* - * HP-PARISC specific bit operations - * for a detailed description of the functions please refer - * to include/asm-i386/bitops.h or kerneldoc - */ - -#define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1)) - - -#define smp_mb__before_clear_bit() smp_mb() -#define smp_mb__after_clear_bit() smp_mb() - -/* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion - * on use of volatile and __*_bit() (set/clear/change): - * *_bit() want use of volatile. - * __*_bit() are "relaxed" and don't use spinlock or volatile. - */ - -static __inline__ void set_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - *addr |= mask; - _atomic_spin_unlock_irqrestore(addr, flags); -} - -static __inline__ void __set_bit(unsigned long nr, volatile unsigned long * addr) -{ - unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG); - - *m |= 1UL << CHOP_SHIFTCOUNT(nr); -} - -static __inline__ void clear_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr)); - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - *addr &= mask; - _atomic_spin_unlock_irqrestore(addr, flags); -} - -static __inline__ void __clear_bit(unsigned long nr, volatile unsigned long * addr) -{ - unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG); - - *m &= ~(1UL << CHOP_SHIFTCOUNT(nr)); -} - -static __inline__ void change_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - *addr ^= mask; - _atomic_spin_unlock_irqrestore(addr, flags); -} - -static __inline__ void __change_bit(unsigned long nr, volatile unsigned long * addr) -{ - unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG); - - *m ^= 1UL << CHOP_SHIFTCOUNT(nr); -} - -static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long oldbit; - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - oldbit = *addr; - *addr = oldbit | mask; - _atomic_spin_unlock_irqrestore(addr, flags); - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int __test_and_set_bit(int nr, volatile unsigned long * address) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long oldbit; - unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG); - - oldbit = *addr; - *addr = oldbit | mask; - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long oldbit; - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - oldbit = *addr; - *addr = oldbit & ~mask; - _atomic_spin_unlock_irqrestore(addr, flags); - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long * address) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG); - unsigned long oldbit; - - oldbit = *addr; - *addr = oldbit & ~mask; - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long oldbit; - unsigned long flags; - - addr += (nr >> SHIFT_PER_LONG); - _atomic_spin_lock_irqsave(addr, flags); - oldbit = *addr; - *addr = oldbit ^ mask; - _atomic_spin_unlock_irqrestore(addr, flags); - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int __test_and_change_bit(int nr, volatile unsigned long * address) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG); - unsigned long oldbit; - - oldbit = *addr; - *addr = oldbit ^ mask; - - return (oldbit & mask) ? 1 : 0; -} - -static __inline__ int test_bit(int nr, const volatile unsigned long *address) -{ - unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); - const unsigned long *addr = (const unsigned long *)address + (nr >> SHIFT_PER_LONG); - - return !!(*addr & mask); -} - -#ifdef __KERNEL__ - -/** - * __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1". - * @word: The word to search - * - * __ffs() return is undefined if no bit is set. - * - * 32-bit fast __ffs by LaMont Jones "lamont At hp com". - * 64-bit enhancement by Grant Grundler "grundler At parisc-linux org". - * (with help from willy/jejb to get the semantics right) - * - * This algorithm avoids branches by making use of nullification. - * One side effect of "extr" instructions is it sets PSW[N] bit. - * How PSW[N] (nullify next insn) gets set is determined by the - * "condition" field (eg "<>" or "TR" below) in the extr* insn. - * Only the 1st and one of either the 2cd or 3rd insn will get executed. - * Each set of 3 insn will get executed in 2 cycles on PA8x00 vs 16 or so - * cycles for each mispredicted branch. - */ - -static __inline__ unsigned long __ffs(unsigned long x) -{ - unsigned long ret; - - __asm__( -#ifdef __LP64__ - " ldi 63,%1\n" - " extrd,u,*<> %0,63,32,%%r0\n" - " extrd,u,*TR %0,31,32,%0\n" /* move top 32-bits down */ - " addi -32,%1,%1\n" -#else - " ldi 31,%1\n" -#endif - " extru,<> %0,31,16,%%r0\n" - " extru,TR %0,15,16,%0\n" /* xxxx0000 -> 0000xxxx */ - " addi -16,%1,%1\n" - " extru,<> %0,31,8,%%r0\n" - " extru,TR %0,23,8,%0\n" /* 0000xx00 -> 000000xx */ - " addi -8,%1,%1\n" - " extru,<> %0,31,4,%%r0\n" - " extru,TR %0,27,4,%0\n" /* 000000x0 -> 0000000x */ - " addi -4,%1,%1\n" - " extru,<> %0,31,2,%%r0\n" - " extru,TR %0,29,2,%0\n" /* 0000000y, 1100b -> 0011b */ - " addi -2,%1,%1\n" - " extru,= %0,31,1,%%r0\n" /* check last bit */ - " addi -1,%1,%1\n" - : "+r" (x), "=r" (ret) ); - return ret; -} - -/* Undefined if no bit is zero. */ -#define ffz(x) __ffs(~x) - -/* - * ffs: find first bit set. returns 1 to BITS_PER_LONG or 0 (if none set) - * This is defined the same way as the libc and compiler builtin - * ffs routines, therefore differs in spirit from the above ffz (man ffs). - */ -static __inline__ int ffs(int x) -{ - return x ? (__ffs((unsigned long)x) + 1) : 0; -} - -/* - * fls: find last (most significant) bit set. - * fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. - */ - -static __inline__ int fls(int x) -{ - int ret; - if (!x) - return 0; - - __asm__( - " ldi 1,%1\n" - " extru,<> %0,15,16,%%r0\n" - " zdep,TR %0,15,16,%0\n" /* xxxx0000 */ - " addi 16,%1,%1\n" - " extru,<> %0,7,8,%%r0\n" - " zdep,TR %0,23,24,%0\n" /* xx000000 */ - " addi 8,%1,%1\n" - " extru,<> %0,3,4,%%r0\n" - " zdep,TR %0,27,28,%0\n" /* x0000000 */ - " addi 4,%1,%1\n" - " extru,<> %0,1,2,%%r0\n" - " zdep,TR %0,29,30,%0\n" /* y0000000 (y&3 = 0) */ - " addi 2,%1,%1\n" - " extru,= %0,0,1,%%r0\n" - " addi 1,%1,%1\n" /* if y & 8, add 1 */ - : "+r" (x), "=r" (ret) ); - - return ret; -} - -/* - * hweightN: returns the hamming weight (i.e. the number - * of bits set) of a N-bit word - */ -#define hweight64(x) generic_hweight64(x) -#define hweight32(x) generic_hweight32(x) -#define hweight16(x) generic_hweight16(x) -#define hweight8(x) generic_hweight8(x) - -/* - * 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 cleared. - */ -static inline int sched_find_first_bit(const unsigned long *b) -{ -#ifdef __LP64__ - if (unlikely(b[0])) - return __ffs(b[0]); - if (unlikely(b[1])) - return __ffs(b[1]) + 64; - return __ffs(b[2]) + 128; -#else - if (unlikely(b[0])) - return __ffs(b[0]); - if (unlikely(b[1])) - return __ffs(b[1]) + 32; - if (unlikely(b[2])) - return __ffs(b[2]) + 64; - if (b[3]) - return __ffs(b[3]) + 96; - return __ffs(b[4]) + 128; -#endif -} - -#endif /* __KERNEL__ */ - -/* - * This implementation of find_{first,next}_zero_bit was stolen from - * Linus' asm-alpha/bitops.h. - */ -#define find_first_zero_bit(addr, size) \ - find_next_zero_bit((addr), (size), 0) - -static __inline__ unsigned long find_next_zero_bit(const void * addr, unsigned long size, unsigned long offset) -{ - const unsigned long * p = ((unsigned long *) addr) + (offset >> SHIFT_PER_LONG); - unsigned long result = offset & ~(BITS_PER_LONG-1); - unsigned long tmp; - - if (offset >= size) - return size; - size -= result; - offset &= (BITS_PER_LONG-1); - if (offset) { - tmp = *(p++); - tmp |= ~0UL >> (BITS_PER_LONG-offset); - if (size < BITS_PER_LONG) - goto found_first; - if (~tmp) - goto found_middle; - size -= BITS_PER_LONG; - result += BITS_PER_LONG; - } - while (size & ~(BITS_PER_LONG -1)) { - if (~(tmp = *(p++))) - goto found_middle; - result += BITS_PER_LONG; - size -= BITS_PER_LONG; - } - if (!size) - return result; - tmp = *p; -found_first: - tmp |= ~0UL << size; -found_middle: - return result + ffz(tmp); -} - -static __inline__ unsigned long find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset) -{ - const unsigned long *p = addr + (offset >> SHIFT_PER_LONG); - unsigned long result = offset & ~(BITS_PER_LONG-1); - unsigned long tmp; - - if (offset >= size) - return size; - size -= result; - offset &= (BITS_PER_LONG-1); - if (offset) { - tmp = *(p++); - tmp &= (~0UL << offset); - if (size < BITS_PER_LONG) - goto found_first; - if (tmp) - goto found_middle; - size -= BITS_PER_LONG; - result += BITS_PER_LONG; - } - while (size & ~(BITS_PER_LONG-1)) { - if ((tmp = *(p++))) - goto found_middle; - result += BITS_PER_LONG; - size -= BITS_PER_LONG; - } - if (!size) - return result; - tmp = *p; - -found_first: - tmp &= (~0UL >> (BITS_PER_LONG - size)); - if (tmp == 0UL) /* Are any bits set? */ - return result + size; /* Nope. */ -found_middle: - return result + __ffs(tmp); -} - -/** - * find_first_bit - find the first set bit in a memory region - * @addr: The address to start the search at - * @size: The maximum size to search - * - * Returns the bit-number of the first set bit, not the number of the byte - * containing a bit. - */ -#define find_first_bit(addr, size) \ - find_next_bit((addr), (size), 0) - -#define _EXT2_HAVE_ASM_BITOPS_ - -#ifdef __KERNEL__ -/* - * test_and_{set,clear}_bit guarantee atomicity without - * disabling interrupts. - */ - -/* '3' is bits per byte */ -#define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3) - -#define ext2_test_bit(nr, addr) \ - test_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) -#define ext2_set_bit(nr, addr) \ - __test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) -#define ext2_clear_bit(nr, addr) \ - __test_and_clear_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) - -#define ext2_set_bit_atomic(l,nr,addr) \ - test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) -#define ext2_clear_bit_atomic(l,nr,addr) \ - test_and_clear_bit( (nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) - -#endif /* __KERNEL__ */ - - -#define ext2_find_first_zero_bit(addr, size) \ - ext2_find_next_zero_bit((addr), (size), 0) - -/* include/linux/byteorder does not support "unsigned long" type */ -static inline unsigned long ext2_swabp(unsigned long * x) -{ -#ifdef __LP64__ - return (unsigned long) __swab64p((u64 *) x); -#else - return (unsigned long) __swab32p((u32 *) x); -#endif -} - -/* include/linux/byteorder doesn't support "unsigned long" type */ -static inline unsigned long ext2_swab(unsigned long y) -{ -#ifdef __LP64__ - return (unsigned long) __swab64((u64) y); -#else - return (unsigned long) __swab32((u32) y); -#endif -} - -static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset) -{ - unsigned long *p = (unsigned long *) addr + (offset >> SHIFT_PER_LONG); - unsigned long result = offset & ~(BITS_PER_LONG - 1); - unsigned long tmp; - - if (offset >= size) - return size; - size -= result; - offset &= (BITS_PER_LONG - 1UL); - if (offset) { - tmp = ext2_swabp(p++); - tmp |= (~0UL >> (BITS_PER_LONG - offset)); - if (size < BITS_PER_LONG) - goto found_first; - if (~tmp) - goto found_middle; - size -= BITS_PER_LONG; - result += BITS_PER_LONG; - } - - while (size & ~(BITS_PER_LONG - 1)) { - if (~(tmp = *(p++))) - goto found_middle_swap; - result += BITS_PER_LONG; - size -= BITS_PER_LONG; - } - if (!size) - return result; - tmp = ext2_swabp(p); -found_first: - tmp |= ~0UL << size; - if (tmp == ~0UL) /* Are any bits zero? */ - return result + size; /* Nope. Skip ffz */ -found_middle: - return result + ffz(tmp); - -found_middle_swap: - return result + ffz(ext2_swab(tmp)); -} - - -/* Bitmap functions for the minix filesystem. */ -#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr) -#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr)) -#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr) -#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr) -#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size) - -#endif /* _PARISC_BITOPS_H */ |