1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
537 lines
13 KiB
C
537 lines
13 KiB
C
/* $Id: bitops.h,v 1.67 2001/11/19 18:36:34 davem Exp $
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* bitops.h: Bit string operations on the Sparc.
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*
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* Copyright 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright 1996 Eddie C. Dost (ecd@skynet.be)
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* Copyright 2001 Anton Blanchard (anton@samba.org)
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*/
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#ifndef _SPARC_BITOPS_H
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#define _SPARC_BITOPS_H
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#include <linux/compiler.h>
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#include <asm/byteorder.h>
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#ifdef __KERNEL__
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/*
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* Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
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* is in the highest of the four bytes and bit '31' is the high bit
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* within the first byte. Sparc is BIG-Endian. Unless noted otherwise
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* all bit-ops return 0 if bit was previously clear and != 0 otherwise.
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*/
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static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___set_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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return mask != 0;
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}
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static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___set_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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}
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static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___clear_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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return mask != 0;
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}
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static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___clear_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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}
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static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___change_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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return mask != 0;
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}
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static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
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{
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register unsigned long mask asm("g2");
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register unsigned long *ADDR asm("g1");
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register int tmp1 asm("g3");
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register int tmp2 asm("g4");
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register int tmp3 asm("g5");
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register int tmp4 asm("g7");
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ADDR = ((unsigned long *) addr) + (nr >> 5);
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mask = 1 << (nr & 31);
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__asm__ __volatile__(
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"mov %%o7, %%g4\n\t"
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"call ___change_bit\n\t"
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" add %%o7, 8, %%o7\n"
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: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
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: "0" (mask), "r" (ADDR)
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: "memory", "cc");
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}
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/*
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* non-atomic versions
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*/
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static inline void __set_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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*p |= mask;
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}
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static inline void __clear_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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*p &= ~mask;
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}
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static inline void __change_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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*p ^= mask;
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}
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static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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unsigned long old = *p;
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*p = old | mask;
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return (old & mask) != 0;
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}
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static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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unsigned long old = *p;
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*p = old & ~mask;
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return (old & mask) != 0;
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}
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static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = 1UL << (nr & 0x1f);
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unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
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unsigned long old = *p;
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*p = old ^ mask;
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return (old & mask) != 0;
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}
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#define smp_mb__before_clear_bit() do { } while(0)
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#define smp_mb__after_clear_bit() do { } while(0)
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/* The following routine need not be atomic. */
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static inline int test_bit(int nr, __const__ volatile unsigned long *addr)
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{
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return (1UL & (((unsigned long *)addr)[nr >> 5] >> (nr & 31))) != 0UL;
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}
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/* The easy/cheese version for now. */
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static inline unsigned long ffz(unsigned long word)
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{
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unsigned long result = 0;
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while(word & 1) {
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result++;
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word >>= 1;
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}
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return result;
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}
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static inline int __ffs(unsigned long word)
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{
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int num = 0;
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if ((word & 0xffff) == 0) {
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num += 16;
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word >>= 16;
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}
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if ((word & 0xff) == 0) {
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num += 8;
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word >>= 8;
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}
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if ((word & 0xf) == 0) {
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num += 4;
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word >>= 4;
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}
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if ((word & 0x3) == 0) {
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num += 2;
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word >>= 2;
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}
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if ((word & 0x1) == 0)
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num += 1;
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return num;
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}
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/*
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* Every architecture must define this function. It's the fastest
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* way of searching a 140-bit bitmap where the first 100 bits are
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* unlikely to be set. It's guaranteed that at least one of the 140
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* bits is cleared.
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*/
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static inline int sched_find_first_bit(unsigned long *b)
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{
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(b[1]))
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return __ffs(b[1]) + 32;
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if (unlikely(b[2]))
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return __ffs(b[2]) + 64;
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if (b[3])
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return __ffs(b[3]) + 96;
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return __ffs(b[4]) + 128;
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}
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/*
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* ffs: find first bit set. This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(int x)
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{
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if (!x)
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return 0;
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return __ffs((unsigned long)x) + 1;
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}
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/*
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* fls: find last (most-significant) bit set.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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#define fls(x) generic_fls(x)
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/*
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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/*
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* find_next_zero_bit() finds the first zero bit in a bit string of length
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* 'size' bits, starting the search at bit 'offset'. This is largely based
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* on Linus's ALPHA routines, which are pretty portable BTW.
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*/
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static inline unsigned long find_next_zero_bit(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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const unsigned long *p = addr + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= 31UL;
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if (offset) {
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tmp = *(p++);
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tmp |= ~0UL >> (32-offset);
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if (size < 32)
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goto found_first;
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if (~tmp)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while (size & ~31UL) {
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if (~(tmp = *(p++)))
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if (!size)
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return result;
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tmp = *p;
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found_first:
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tmp |= ~0UL << size;
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if (tmp == ~0UL) /* Are any bits zero? */
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return result + size; /* Nope. */
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found_middle:
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return result + ffz(tmp);
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}
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/*
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* Linus sez that gcc can optimize the following correctly, we'll see if this
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* holds on the Sparc as it does for the ALPHA.
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*/
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#define find_first_zero_bit(addr, size) \
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find_next_zero_bit((addr), (size), 0)
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/**
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* find_next_bit - find the first set bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The maximum size to search
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*
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* Scheduler induced bitop, do not use.
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*/
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static inline int find_next_bit(const unsigned long *addr, int size, int offset)
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{
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const unsigned long *p = addr + (offset >> 5);
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int num = offset & ~0x1f;
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unsigned long word;
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word = *p++;
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word &= ~((1 << (offset & 0x1f)) - 1);
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while (num < size) {
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if (word != 0) {
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return __ffs(word) + num;
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}
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word = *p++;
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num += 0x20;
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}
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return num;
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}
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum size to search
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*
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* Returns the bit-number of the first set bit, not the number of the byte
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* containing a bit.
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*/
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#define find_first_bit(addr, size) \
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find_next_bit((addr), (size), 0)
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/*
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*/
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static inline int test_le_bit(int nr, __const__ unsigned long * addr)
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{
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__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
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return (ADDR[nr >> 3] >> (nr & 7)) & 1;
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}
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/*
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* non-atomic versions
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*/
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static inline void __set_le_bit(int nr, unsigned long *addr)
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{
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unsigned char *ADDR = (unsigned char *)addr;
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ADDR += nr >> 3;
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*ADDR |= 1 << (nr & 0x07);
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}
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static inline void __clear_le_bit(int nr, unsigned long *addr)
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{
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unsigned char *ADDR = (unsigned char *)addr;
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ADDR += nr >> 3;
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*ADDR &= ~(1 << (nr & 0x07));
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}
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static inline int __test_and_set_le_bit(int nr, unsigned long *addr)
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{
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int mask, retval;
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unsigned char *ADDR = (unsigned char *)addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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retval = (mask & *ADDR) != 0;
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*ADDR |= mask;
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return retval;
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}
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static inline int __test_and_clear_le_bit(int nr, unsigned long *addr)
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{
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int mask, retval;
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unsigned char *ADDR = (unsigned char *)addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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retval = (mask & *ADDR) != 0;
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*ADDR &= ~mask;
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return retval;
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}
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static inline unsigned long find_next_zero_le_bit(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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const unsigned long *p = addr + (offset >> 5);
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unsigned long result = offset & ~31UL;
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unsigned long tmp;
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if (offset >= size)
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return size;
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size -= result;
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offset &= 31UL;
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if(offset) {
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tmp = *(p++);
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tmp |= __swab32(~0UL >> (32-offset));
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if(size < 32)
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goto found_first;
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if(~tmp)
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goto found_middle;
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size -= 32;
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result += 32;
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}
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while(size & ~31UL) {
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if(~(tmp = *(p++)))
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goto found_middle;
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result += 32;
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size -= 32;
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}
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if(!size)
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return result;
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tmp = *p;
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found_first:
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tmp = __swab32(tmp) | (~0UL << size);
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if (tmp == ~0UL) /* Are any bits zero? */
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return result + size; /* Nope. */
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return result + ffz(tmp);
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found_middle:
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return result + ffz(__swab32(tmp));
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}
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#define find_first_zero_le_bit(addr, size) \
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find_next_zero_le_bit((addr), (size), 0)
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#define ext2_set_bit(nr,addr) \
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__test_and_set_le_bit((nr),(unsigned long *)(addr))
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#define ext2_clear_bit(nr,addr) \
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__test_and_clear_le_bit((nr),(unsigned long *)(addr))
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#define ext2_set_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = ext2_set_bit((nr), (unsigned long *)(addr)); \
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spin_unlock(lock); \
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ret; \
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})
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#define ext2_clear_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = ext2_clear_bit((nr), (unsigned long *)(addr)); \
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spin_unlock(lock); \
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ret; \
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})
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#define ext2_test_bit(nr,addr) \
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test_le_bit((nr),(unsigned long *)(addr))
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#define ext2_find_first_zero_bit(addr, size) \
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find_first_zero_le_bit((unsigned long *)(addr), (size))
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#define ext2_find_next_zero_bit(addr, size, off) \
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find_next_zero_le_bit((unsigned long *)(addr), (size), (off))
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/* Bitmap functions for the minix filesystem. */
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#define minix_test_and_set_bit(nr,addr) \
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test_and_set_bit((nr),(unsigned long *)(addr))
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#define minix_set_bit(nr,addr) \
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set_bit((nr),(unsigned long *)(addr))
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#define minix_test_and_clear_bit(nr,addr) \
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test_and_clear_bit((nr),(unsigned long *)(addr))
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#define minix_test_bit(nr,addr) \
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test_bit((nr),(unsigned long *)(addr))
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#define minix_find_first_zero_bit(addr,size) \
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find_first_zero_bit((unsigned long *)(addr),(size))
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#endif /* __KERNEL__ */
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#endif /* defined(_SPARC_BITOPS_H) */
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