2008-04-04 16:16:06 +00:00
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/*
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* Copyright (c) 2008 Carsten Schlote <c.schlote@konzeptpark.de>
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* See file CREDITS for list of people who contributed to this project.
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*
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* This file is part of U-Boot V2.
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*
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* U-Boot V2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* U-Boot V2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with U-Boot V2. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file
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* Bitops helper functions and defines for M68k
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*
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* bit 0 is the LSB of addr; bit 32 is the HSB.
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*
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* Please note that the code in this file should never be included
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* from user space. Many of these are not implemented in assembler
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* since they would be too costly. Also, they require priviledged
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* instructions (which are not available from user mode) to ensure
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* that they are atomic.
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*/
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#ifndef __ASM_M68K_BITOPS_H
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#define __ASM_M68K_BITOPS_H
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/*
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* Function prototypes to keep gcc -Wall happy.
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*/
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extern void set_bit(int nr, volatile void * addr);
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static inline void __set_bit(int nr, volatile void *addr)
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{
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((unsigned char *) addr)[nr >> 3] |= (1U << (nr & 7));
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}
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extern void clear_bit(int nr, volatile void * addr);
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static inline void __clear_bit(int nr, volatile void *addr)
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{
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((unsigned char *) addr)[nr >> 3] &= ~(1U << (nr & 7));
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}
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extern void change_bit(int nr, volatile void * addr);
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static inline void __change_bit(int nr, volatile void *addr)
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{
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((unsigned char *) addr)[nr >> 3] ^= (1U << (nr & 7));
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}
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extern int test_and_set_bit(int nr, volatile void * addr);
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static inline int __test_and_set_bit(int nr, volatile void *addr)
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{
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unsigned int mask = 1 << (nr & 7);
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unsigned int oldval;
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oldval = ((unsigned char *) addr)[nr >> 3];
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((unsigned char *) addr)[nr >> 3] = oldval | mask;
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return oldval & mask;
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}
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extern int test_and_clear_bit(int nr, volatile void * addr);
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static inline int __test_and_clear_bit(int nr, volatile void *addr)
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{
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unsigned int mask = 1 << (nr & 7);
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unsigned int oldval;
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oldval = ((unsigned char *) addr)[nr >> 3];
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((unsigned char *) addr)[nr >> 3] = oldval & ~mask;
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return oldval & mask;
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}
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extern int test_and_change_bit(int nr, volatile void * addr);
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static inline int __test_and_change_bit(int nr, volatile void *addr)
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{
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unsigned int mask = 1 << (nr & 7);
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unsigned int oldval;
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oldval = ((unsigned char *) addr)[nr >> 3];
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((unsigned char *) addr)[nr >> 3] = oldval ^ mask;
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return oldval & mask;
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}
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extern int find_first_zero_bit(void * addr, unsigned size);
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extern int find_next_zero_bit(void * addr, int size, int offset);
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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 test_bit(int nr, const void * addr)
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{
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return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
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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 k;
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word = ~word;
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k = 31;
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if (word & 0x0000ffff) { k -= 16; word <<= 16; }
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if (word & 0x00ff0000) { k -= 8; word <<= 8; }
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if (word & 0x0f000000) { k -= 4; word <<= 4; }
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if (word & 0x30000000) { k -= 2; word <<= 2; }
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if (word & 0x40000000) { k -= 1; }
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return k;
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}
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2008-08-15 01:29:51 +00:00
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#include <asm-generic/bitops/ffs.h>
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#include <asm-generic/bitops/hweight.h>
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2008-04-04 16:16:06 +00:00
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#define ext2_set_bit test_and_set_bit
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#define ext2_clear_bit test_and_clear_bit
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#define ext2_test_bit test_bit
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#define ext2_find_first_zero_bit find_first_zero_bit
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#define ext2_find_next_zero_bit find_next_zero_bit
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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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#endif /* __ASM_M68K_BITOPS_H */
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