mirror of
https://github.com/edk2-porting/linux-next.git
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69c5ddf58a
Add ext2_find_{first,next}_bit(), which are needed for ext4. They're
derived out of the ext2_find_next_zero_bit found in the same file.
Compile tested with crosstools
[Reworked to preserve all symmetry with ext2_find_{first,next}_zero_bit()]
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=10393
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
460 lines
11 KiB
C
460 lines
11 KiB
C
#ifndef _M68K_BITOPS_H
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#define _M68K_BITOPS_H
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/*
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* Copyright 1992, Linus Torvalds.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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#include <linux/compiler.h>
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/*
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* Require 68020 or better.
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*
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* They use the standard big-endian m680x0 bit ordering.
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*/
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#define test_and_set_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_test_and_set_bit(nr, vaddr) : \
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__generic_test_and_set_bit(nr, vaddr))
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#define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)
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static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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char retval;
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__asm__ __volatile__ ("bset %2,%1; sne %0"
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: "=d" (retval), "+m" (*p)
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: "di" (nr & 7));
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return retval;
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}
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static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
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{
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char retval;
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__asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
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return retval;
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}
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#define set_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_set_bit(nr, vaddr) : \
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__generic_set_bit(nr, vaddr))
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#define __set_bit(nr,vaddr) set_bit(nr,vaddr)
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static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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__asm__ __volatile__ ("bset %1,%0"
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: "+m" (*p) : "di" (nr & 7));
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}
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static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
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{
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__asm__ __volatile__ ("bfset %1{%0:#1}"
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: : "d" (nr^31), "o" (*vaddr) : "memory");
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}
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#define test_and_clear_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_test_and_clear_bit(nr, vaddr) : \
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__generic_test_and_clear_bit(nr, vaddr))
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#define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)
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static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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char retval;
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__asm__ __volatile__ ("bclr %2,%1; sne %0"
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: "=d" (retval), "+m" (*p)
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: "di" (nr & 7));
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return retval;
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}
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static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
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{
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char retval;
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__asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
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return retval;
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}
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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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#define clear_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_clear_bit(nr, vaddr) : \
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__generic_clear_bit(nr, vaddr))
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#define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)
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static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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__asm__ __volatile__ ("bclr %1,%0"
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: "+m" (*p) : "di" (nr & 7));
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}
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static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
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{
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__asm__ __volatile__ ("bfclr %1{%0:#1}"
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: : "d" (nr^31), "o" (*vaddr) : "memory");
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}
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#define test_and_change_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_test_and_change_bit(nr, vaddr) : \
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__generic_test_and_change_bit(nr, vaddr))
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#define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
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#define __change_bit(nr,vaddr) change_bit(nr,vaddr)
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static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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char retval;
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__asm__ __volatile__ ("bchg %2,%1; sne %0"
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: "=d" (retval), "+m" (*p)
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: "di" (nr & 7));
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return retval;
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}
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static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
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{
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char retval;
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__asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
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: "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
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return retval;
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}
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#define change_bit(nr,vaddr) \
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(__builtin_constant_p(nr) ? \
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__constant_change_bit(nr, vaddr) : \
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__generic_change_bit(nr, vaddr))
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static inline void __constant_change_bit(int nr, unsigned long *vaddr)
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{
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char *p = (char *)vaddr + (nr ^ 31) / 8;
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__asm__ __volatile__ ("bchg %1,%0"
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: "+m" (*p) : "di" (nr & 7));
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}
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static inline void __generic_change_bit(int nr, unsigned long *vaddr)
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{
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__asm__ __volatile__ ("bfchg %1{%0:#1}"
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: : "d" (nr^31), "o" (*vaddr) : "memory");
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}
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static inline int test_bit(int nr, const unsigned long *vaddr)
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{
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return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
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}
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static inline int find_first_zero_bit(const unsigned long *vaddr,
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unsigned size)
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{
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const unsigned long *p = vaddr;
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int res = 32;
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unsigned long num;
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if (!size)
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return 0;
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size = (size + 31) >> 5;
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while (!(num = ~*p++)) {
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if (!--size)
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goto out;
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}
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__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
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: "=d" (res) : "d" (num & -num));
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res ^= 31;
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out:
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return ((long)p - (long)vaddr - 4) * 8 + res;
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}
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static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
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int offset)
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{
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const unsigned long *p = vaddr + (offset >> 5);
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int bit = offset & 31UL, res;
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if (offset >= size)
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return size;
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if (bit) {
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unsigned long num = ~*p++ & (~0UL << bit);
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offset -= bit;
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/* Look for zero in first longword */
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__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
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: "=d" (res) : "d" (num & -num));
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if (res < 32)
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return offset + (res ^ 31);
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offset += 32;
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}
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/* No zero yet, search remaining full bytes for a zero */
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res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
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return offset + res;
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}
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static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
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{
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const unsigned long *p = vaddr;
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int res = 32;
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unsigned long num;
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if (!size)
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return 0;
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size = (size + 31) >> 5;
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while (!(num = *p++)) {
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if (!--size)
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goto out;
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}
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__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
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: "=d" (res) : "d" (num & -num));
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res ^= 31;
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out:
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return ((long)p - (long)vaddr - 4) * 8 + res;
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}
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static inline int find_next_bit(const unsigned long *vaddr, int size,
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int offset)
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{
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const unsigned long *p = vaddr + (offset >> 5);
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int bit = offset & 31UL, res;
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if (offset >= size)
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return size;
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if (bit) {
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unsigned long num = *p++ & (~0UL << bit);
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offset -= bit;
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/* Look for one in first longword */
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__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
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: "=d" (res) : "d" (num & -num));
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if (res < 32)
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return offset + (res ^ 31);
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offset += 32;
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}
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/* No one yet, search remaining full bytes for a one */
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res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
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return offset + res;
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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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int res;
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__asm__ __volatile__ ("bfffo %1{#0,#0},%0"
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: "=d" (res) : "d" (~word & -~word));
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return res ^ 31;
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}
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#ifdef __KERNEL__
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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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int cnt;
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asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
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return 32 - cnt;
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}
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#define __ffs(x) (ffs(x) - 1)
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/*
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* fls: find last bit set.
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*/
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static inline int fls(int x)
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{
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int cnt;
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asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));
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return 32 - cnt;
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}
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/lock.h>
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/* Bitmap functions for the minix filesystem */
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static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
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{
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const unsigned short *p = vaddr, *addr = vaddr;
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int res;
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unsigned short num;
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if (!size)
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return 0;
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size = (size >> 4) + ((size & 15) > 0);
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while (*p++ == 0xffff)
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{
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if (--size == 0)
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return (p - addr) << 4;
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}
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num = ~*--p;
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__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
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: "=d" (res) : "d" (num & -num));
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return ((p - addr) << 4) + (res ^ 31);
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}
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#define minix_test_and_set_bit(nr, addr) __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
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#define minix_set_bit(nr,addr) __set_bit((nr) ^ 16, (unsigned long *)(addr))
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#define minix_test_and_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
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static inline int minix_test_bit(int nr, const void *vaddr)
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{
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const unsigned short *p = vaddr;
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return (p[nr >> 4] & (1U << (nr & 15))) != 0;
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}
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/* Bitmap functions for the ext2 filesystem. */
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#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
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#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
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#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
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#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
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static inline int ext2_test_bit(int nr, const void *vaddr)
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{
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const unsigned char *p = vaddr;
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return (p[nr >> 3] & (1U << (nr & 7))) != 0;
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}
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static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
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{
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const unsigned long *p = vaddr, *addr = vaddr;
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int res;
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if (!size)
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return 0;
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size = (size >> 5) + ((size & 31) > 0);
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while (*p++ == ~0UL)
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{
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if (--size == 0)
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return (p - addr) << 5;
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}
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--p;
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for (res = 0; res < 32; res++)
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if (!ext2_test_bit (res, p))
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break;
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return (p - addr) * 32 + res;
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}
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static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
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unsigned offset)
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{
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const unsigned long *addr = vaddr;
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const unsigned long *p = addr + (offset >> 5);
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int bit = offset & 31UL, res;
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if (offset >= size)
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return size;
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if (bit) {
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/* Look for zero in first longword */
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for (res = bit; res < 32; res++)
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if (!ext2_test_bit (res, p))
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return (p - addr) * 32 + res;
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p++;
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}
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/* No zero yet, search remaining full bytes for a zero */
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res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
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return (p - addr) * 32 + res;
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}
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static inline int ext2_find_first_bit(const void *vaddr, unsigned size)
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{
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const unsigned long *p = vaddr, *addr = vaddr;
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int res;
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if (!size)
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return 0;
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size = (size >> 5) + ((size & 31) > 0);
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while (*p++ == 0UL) {
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if (--size == 0)
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return (p - addr) << 5;
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}
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--p;
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for (res = 0; res < 32; res++)
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if (ext2_test_bit(res, p))
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break;
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return (p - addr) * 32 + res;
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}
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static inline int ext2_find_next_bit(const void *vaddr, unsigned size,
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unsigned offset)
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{
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const unsigned long *addr = vaddr;
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const unsigned long *p = addr + (offset >> 5);
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int bit = offset & 31UL, res;
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if (offset >= size)
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return size;
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if (bit) {
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/* Look for one in first longword */
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for (res = bit; res < 32; res++)
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if (ext2_test_bit(res, p))
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return (p - addr) * 32 + res;
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p++;
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}
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/* No set bit yet, search remaining full bytes for a set bit */
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res = ext2_find_first_bit(p, size - 32 * (p - addr));
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return (p - addr) * 32 + res;
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}
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#endif /* __KERNEL__ */
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#endif /* _M68K_BITOPS_H */
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