mirror of
https://github.com/AsahiLinux/u-boot
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378 lines
8 KiB
C
378 lines
8 KiB
C
/*
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* U-boot - bitops.h Routines for bit operations
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*
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* Copyright (c) 2005-2007 Analog Devices Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef _BLACKFIN_BITOPS_H
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#define _BLACKFIN_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 <asm/byteorder.h>
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#include <asm/system.h>
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#ifdef __KERNEL__
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/*
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* Function prototypes to keep gcc -Wall happy
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*/
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/*
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* The __ functions are not atomic
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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 void *addr)
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{
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int *a = (int *)addr;
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int mask;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a |= mask;
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local_irq_restore(flags);
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}
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static __inline__ void __set_bit(int nr, volatile void *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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*a |= mask;
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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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static __inline__ void clear_bit(int nr, volatile void *addr)
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{
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int *a = (int *)addr;
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int mask;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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*a &= ~mask;
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local_irq_restore(flags);
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}
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static __inline__ void change_bit(int nr, volatile void *addr)
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{
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int mask, flags;
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unsigned long *ADDR = (unsigned long *)addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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local_irq_save(flags);
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*ADDR ^= mask;
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local_irq_restore(flags);
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}
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static __inline__ void __change_bit(int nr, volatile void *addr)
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{
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int mask;
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unsigned long *ADDR = (unsigned long *)addr;
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ADDR += nr >> 5;
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mask = 1 << (nr & 31);
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*ADDR ^= mask;
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}
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static __inline__ int test_and_set_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a |= mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_set_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a |= mask;
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return retval;
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}
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static __inline__ int test_and_clear_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_clear_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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return retval;
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}
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static __inline__ int test_and_change_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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unsigned long flags;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a ^= mask;
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local_irq_restore(flags);
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return retval;
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}
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static __inline__ int __test_and_change_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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volatile unsigned int *a = (volatile unsigned int *)addr;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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retval = (mask & *a) != 0;
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*a ^= mask;
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return retval;
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}
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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 void *addr)
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{
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return ((1UL << (nr & 31)) &
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(((const volatile unsigned int *)addr)[nr >> 5])) != 0;
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}
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static __inline__ int __test_bit(int nr, volatile void *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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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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* 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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#define ffs(x) generic_ffs(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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static __inline__ int ext2_set_bit(int nr, volatile void *addr)
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{
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int mask, retval;
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unsigned long flags;
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volatile 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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local_irq_save(flags);
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retval = (mask & *ADDR) != 0;
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*ADDR |= mask;
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local_irq_restore(flags);
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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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int mask, retval;
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unsigned long flags;
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volatile 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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local_irq_save(flags);
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retval = (mask & *ADDR) != 0;
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*ADDR &= ~mask;
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local_irq_restore(flags);
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return retval;
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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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int mask;
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const volatile unsigned char *ADDR = (const unsigned char *)addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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return ((mask & *ADDR) != 0);
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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,
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unsigned long size,
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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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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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/* 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
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#endif
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