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!
504 lines
11 KiB
C
504 lines
11 KiB
C
#ifndef _M68KNOMMU_BITOPS_H
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#define _M68KNOMMU_BITOPS_H
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/*
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* Copyright 1992, Linus Torvalds.
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*/
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#include <linux/config.h>
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#include <linux/compiler.h>
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#include <asm/byteorder.h> /* swab32 */
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#include <asm/system.h> /* save_flags */
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#ifdef __KERNEL__
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/*
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* Generic ffs().
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*/
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static inline int ffs(int x)
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{
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int r = 1;
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if (!x)
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return 0;
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if (!(x & 0xffff)) {
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x >>= 16;
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r += 16;
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}
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if (!(x & 0xff)) {
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x >>= 8;
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r += 8;
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}
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if (!(x & 0xf)) {
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x >>= 4;
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r += 4;
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}
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if (!(x & 3)) {
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x >>= 2;
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r += 2;
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}
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if (!(x & 1)) {
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x >>= 1;
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r += 1;
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}
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return r;
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}
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/*
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* Generic __ffs().
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*/
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static inline int __ffs(int x)
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{
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int r = 0;
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if (!x)
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return 0;
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if (!(x & 0xffff)) {
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x >>= 16;
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r += 16;
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}
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if (!(x & 0xff)) {
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x >>= 8;
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r += 8;
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}
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if (!(x & 0xf)) {
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x >>= 4;
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r += 4;
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}
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if (!(x & 3)) {
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x >>= 2;
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r += 2;
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}
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if (!(x & 1)) {
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x >>= 1;
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r += 1;
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}
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return r;
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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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* ffz = Find First Zero in word. Undefined if no zero exists,
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* so code should check against ~0UL first..
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*/
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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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static __inline__ void set_bit(int nr, volatile unsigned long * addr)
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{
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %0,%%a0; bset %1,(%%a0)"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0", "cc");
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#else
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__asm__ __volatile__ ("bset %1,%0"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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: "cc");
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#endif
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}
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#define __set_bit(nr, addr) set_bit(nr, addr)
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/*
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* clear_bit() doesn't provide any barrier for the compiler.
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*/
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
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{
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %0,%%a0; bclr %1,(%%a0)"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0", "cc");
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#else
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__asm__ __volatile__ ("bclr %1,%0"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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: "cc");
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#endif
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}
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#define __clear_bit(nr, addr) clear_bit(nr, addr)
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static __inline__ void change_bit(int nr, volatile unsigned long * addr)
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{
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %0,%%a0; bchg %1,(%%a0)"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0", "cc");
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#else
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__asm__ __volatile__ ("bchg %1,%0"
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: "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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: "cc");
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#endif
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}
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#define __change_bit(nr, addr) change_bit(nr, addr)
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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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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("bset %2,%1; sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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#define __test_and_set_bit(nr, addr) test_and_set_bit(nr, addr)
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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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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("bclr %2,%1; sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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#define __test_and_clear_bit(nr, addr) test_and_clear_bit(nr, addr)
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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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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0\n\tbchg %2,(%%a0)\n\tsne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("bchg %2,%1; sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[(nr^31) >> 3])
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: "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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#define __test_and_change_bit(nr, addr) test_and_change_bit(nr, addr)
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/*
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* This routine doesn't need to be atomic.
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*/
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static __inline__ int __constant_test_bit(int nr, const volatile unsigned long * addr)
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{
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return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
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}
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static __inline__ int __test_bit(int nr, const volatile unsigned long * addr)
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{
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int * a = (int *) addr;
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int mask;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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return ((mask & *a) != 0);
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}
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#define test_bit(nr,addr) \
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(__builtin_constant_p(nr) ? \
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__constant_test_bit((nr),(addr)) : \
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__test_bit((nr),(addr)))
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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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#define find_first_bit(addr, size) \
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find_next_bit((addr), (size), 0)
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static __inline__ int find_next_zero_bit (void * addr, int size, int offset)
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{
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unsigned long *p = ((unsigned long *) 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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found_middle:
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return result + ffz(tmp);
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}
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/*
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* Find next one bit in a bitmap reasonably efficiently.
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*/
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static __inline__ unsigned long find_next_bit(const unsigned long *addr,
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unsigned long size, unsigned long offset)
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{
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unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
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unsigned int result = offset & ~31UL;
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unsigned int 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 << 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 >= 32) {
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if ((tmp = *p++) != 0)
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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 >> (32 - size);
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if (tmp == 0UL) /* Are any bits set? */
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return result + size; /* Nope. */
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found_middle:
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return result + __ffs(tmp);
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}
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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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static __inline__ int ext2_set_bit(int nr, volatile void * addr)
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{
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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0; bset %2,(%%a0); sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
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: "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("bset %2,%1; sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
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: "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
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{
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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0; bclr %2,(%%a0); sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
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: "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("bclr %2,%1; sne %0"
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: "=d" (retval), "+m" (((volatile char *)addr)[nr >> 3])
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: "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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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), (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), (addr)); \
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spin_unlock(lock); \
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ret; \
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})
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static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
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{
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char retval;
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#ifdef CONFIG_COLDFIRE
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__asm__ __volatile__ ("lea %1,%%a0; btst %2,(%%a0); sne %0"
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: "=d" (retval)
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: "m" (((const volatile char *)addr)[nr >> 3]), "d" (nr)
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: "%a0");
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#else
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__asm__ __volatile__ ("btst %2,%1; sne %0"
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: "=d" (retval)
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: "m" (((const volatile char *)addr)[nr >> 3]), "di" (nr)
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/* No clobber */);
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#endif
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return retval;
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}
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#define ext2_find_first_zero_bit(addr, size) \
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ext2_find_next_zero_bit((addr), (size), 0)
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static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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{
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unsigned long *p = ((unsigned long *) 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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/* We hold the little endian value in tmp, but then the
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* shift is illegal. So we could keep a big endian value
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* in tmp, like this:
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*
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* tmp = __swab32(*(p++));
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* tmp |= ~0UL >> (32-offset);
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*
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* but this would decrease preformance, so we change the
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* shift:
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*/
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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 is little endian, so we would have to swab the shift,
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* see above. But then we have to swab tmp below for ffz, so
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* we might as well do this here.
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*/
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return result + ffz(__swab32(tmp) | (~0UL << size));
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found_middle:
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return result + ffz(__swab32(tmp));
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}
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/* Bitmap functions for the minix filesystem. */
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#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
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#define minix_set_bit(nr,addr) set_bit(nr,addr)
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#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
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#define minix_test_bit(nr,addr) test_bit(nr,addr)
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#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
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/**
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* hweightN - returns the hamming weight of a N-bit word
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* @x: the word to weigh
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*
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* The Hamming Weight of a number is the total number of bits set in it.
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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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#endif /* __KERNEL__ */
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/*
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* fls: find last bit set.
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*/
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#define fls(x) generic_fls(x)
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#endif /* _M68KNOMMU_BITOPS_H */
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