You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
341 lines
7.7 KiB
341 lines
7.7 KiB
/* bitops.h: bit operations for the Fujitsu FR-V CPUs
|
|
*
|
|
* For an explanation of how atomic ops work in this arch, see:
|
|
* Documentation/fujitsu/frv/atomic-ops.txt
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_BITOPS_H
|
|
#define _ASM_BITOPS_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/compiler.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/system.h>
|
|
#include <asm/atomic.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* ffz = Find First Zero in word. Undefined if no zero exists,
|
|
* so code should check against ~0UL first..
|
|
*/
|
|
static inline unsigned long ffz(unsigned long word)
|
|
{
|
|
unsigned long result = 0;
|
|
|
|
while (word & 1) {
|
|
result++;
|
|
word >>= 1;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* clear_bit() doesn't provide any barrier for the compiler.
|
|
*/
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
static inline int test_and_clear_bit(int nr, volatile void *addr)
|
|
{
|
|
volatile unsigned long *ptr = addr;
|
|
unsigned long mask = 1UL << (nr & 31);
|
|
ptr += nr >> 5;
|
|
return (atomic_test_and_ANDNOT_mask(mask, ptr) & mask) != 0;
|
|
}
|
|
|
|
static inline int test_and_set_bit(int nr, volatile void *addr)
|
|
{
|
|
volatile unsigned long *ptr = addr;
|
|
unsigned long mask = 1UL << (nr & 31);
|
|
ptr += nr >> 5;
|
|
return (atomic_test_and_OR_mask(mask, ptr) & mask) != 0;
|
|
}
|
|
|
|
static inline int test_and_change_bit(int nr, volatile void *addr)
|
|
{
|
|
volatile unsigned long *ptr = addr;
|
|
unsigned long mask = 1UL << (nr & 31);
|
|
ptr += nr >> 5;
|
|
return (atomic_test_and_XOR_mask(mask, ptr) & mask) != 0;
|
|
}
|
|
|
|
static inline void clear_bit(int nr, volatile void *addr)
|
|
{
|
|
test_and_clear_bit(nr, addr);
|
|
}
|
|
|
|
static inline void set_bit(int nr, volatile void *addr)
|
|
{
|
|
test_and_set_bit(nr, addr);
|
|
}
|
|
|
|
static inline void change_bit(int nr, volatile void * addr)
|
|
{
|
|
test_and_change_bit(nr, addr);
|
|
}
|
|
|
|
static inline void __clear_bit(int nr, volatile void * addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
*a &= ~mask;
|
|
}
|
|
|
|
static inline void __set_bit(int nr, volatile void * addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
*a |= mask;
|
|
}
|
|
|
|
static inline void __change_bit(int nr, volatile void *addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
*a ^= mask;
|
|
}
|
|
|
|
static inline int __test_and_clear_bit(int nr, volatile void * addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask, retval;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
retval = (mask & *a) != 0;
|
|
*a &= ~mask;
|
|
return retval;
|
|
}
|
|
|
|
static inline int __test_and_set_bit(int nr, volatile void * addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask, retval;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
retval = (mask & *a) != 0;
|
|
*a |= mask;
|
|
return retval;
|
|
}
|
|
|
|
static inline int __test_and_change_bit(int nr, volatile void * addr)
|
|
{
|
|
volatile unsigned long *a = addr;
|
|
int mask, retval;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 31);
|
|
retval = (mask & *a) != 0;
|
|
*a ^= mask;
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* This routine doesn't need to be atomic.
|
|
*/
|
|
static inline int __constant_test_bit(int nr, const volatile void * addr)
|
|
{
|
|
return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
|
|
}
|
|
|
|
static inline int __test_bit(int nr, const volatile void * addr)
|
|
{
|
|
int * a = (int *) addr;
|
|
int mask;
|
|
|
|
a += nr >> 5;
|
|
mask = 1 << (nr & 0x1f);
|
|
return ((mask & *a) != 0);
|
|
}
|
|
|
|
#define test_bit(nr,addr) \
|
|
(__builtin_constant_p(nr) ? \
|
|
__constant_test_bit((nr),(addr)) : \
|
|
__test_bit((nr),(addr)))
|
|
|
|
extern int find_next_bit(const unsigned long *addr, int size, int offset);
|
|
|
|
#define find_first_bit(addr, size) find_next_bit(addr, size, 0)
|
|
|
|
#define find_first_zero_bit(addr, size) \
|
|
find_next_zero_bit((addr), (size), 0)
|
|
|
|
static inline int find_next_zero_bit(const void *addr, int size, int offset)
|
|
{
|
|
const unsigned long *p = ((const unsigned long *) addr) + (offset >> 5);
|
|
unsigned long result = offset & ~31UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (32-offset);
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size & ~31UL) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp |= ~0UL >> size;
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
#define ffs(x) generic_ffs(x)
|
|
#define __ffs(x) (ffs(x) - 1)
|
|
|
|
/*
|
|
* fls: find last bit set.
|
|
*/
|
|
#define fls(x) \
|
|
({ \
|
|
int bit; \
|
|
\
|
|
asm("scan %1,gr0,%0" : "=r"(bit) : "r"(x)); \
|
|
\
|
|
bit ? 33 - bit : bit; \
|
|
})
|
|
|
|
/*
|
|
* Every architecture must define this function. It's the fastest
|
|
* way of searching a 140-bit bitmap where the first 100 bits are
|
|
* unlikely to be set. It's guaranteed that at least one of the 140
|
|
* bits is cleared.
|
|
*/
|
|
static inline int sched_find_first_bit(const unsigned long *b)
|
|
{
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (unlikely(b[1]))
|
|
return __ffs(b[1]) + 32;
|
|
if (unlikely(b[2]))
|
|
return __ffs(b[2]) + 64;
|
|
if (b[3])
|
|
return __ffs(b[3]) + 96;
|
|
return __ffs(b[4]) + 128;
|
|
}
|
|
|
|
|
|
/*
|
|
* hweightN: returns the hamming weight (i.e. the number
|
|
* of bits set) of a N-bit word
|
|
*/
|
|
|
|
#define hweight32(x) generic_hweight32(x)
|
|
#define hweight16(x) generic_hweight16(x)
|
|
#define hweight8(x) generic_hweight8(x)
|
|
|
|
#define ext2_set_bit(nr, addr) test_and_set_bit ((nr) ^ 0x18, (addr))
|
|
#define ext2_clear_bit(nr, addr) test_and_clear_bit((nr) ^ 0x18, (addr))
|
|
|
|
#define ext2_set_bit_atomic(lock,nr,addr) ext2_set_bit((nr), addr)
|
|
#define ext2_clear_bit_atomic(lock,nr,addr) ext2_clear_bit((nr), addr)
|
|
|
|
static inline int ext2_test_bit(int nr, const volatile void * addr)
|
|
{
|
|
const volatile unsigned char *ADDR = (const unsigned char *) addr;
|
|
int mask;
|
|
|
|
ADDR += nr >> 3;
|
|
mask = 1 << (nr & 0x07);
|
|
return ((mask & *ADDR) != 0);
|
|
}
|
|
|
|
#define ext2_find_first_zero_bit(addr, size) \
|
|
ext2_find_next_zero_bit((addr), (size), 0)
|
|
|
|
static inline unsigned long ext2_find_next_zero_bit(const void *addr,
|
|
unsigned long size,
|
|
unsigned long offset)
|
|
{
|
|
const unsigned long *p = ((const unsigned long *) addr) + (offset >> 5);
|
|
unsigned long result = offset & ~31UL;
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if(offset) {
|
|
/* We hold the little endian value in tmp, but then the
|
|
* shift is illegal. So we could keep a big endian value
|
|
* in tmp, like this:
|
|
*
|
|
* tmp = __swab32(*(p++));
|
|
* tmp |= ~0UL >> (32-offset);
|
|
*
|
|
* but this would decrease preformance, so we change the
|
|
* shift:
|
|
*/
|
|
tmp = *(p++);
|
|
tmp |= __swab32(~0UL >> (32-offset));
|
|
if(size < 32)
|
|
goto found_first;
|
|
if(~tmp)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while(size & ~31UL) {
|
|
if(~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if(!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
/* tmp is little endian, so we would have to swab the shift,
|
|
* see above. But then we have to swab tmp below for ffz, so
|
|
* we might as well do this here.
|
|
*/
|
|
return result + ffz(__swab32(tmp) | (~0UL << size));
|
|
found_middle:
|
|
return result + ffz(__swab32(tmp));
|
|
}
|
|
|
|
/* Bitmap functions for the minix filesystem. */
|
|
#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
|
|
#define minix_set_bit(nr,addr) ext2_set_bit(nr,addr)
|
|
#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr)
|
|
#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr)
|
|
#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_BITOPS_H */
|
|
|