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yaml
---
r: 24176
b: refs/heads/master
c: f6e0213
h: refs/heads/master
v: v3
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Akinobu Mita authored and Linus Torvalds committed Mar 26, 2006
1 parent 3c2a574 commit d00753a
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Showing 3 changed files with 18 additions and 214 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 1f6d7a93c141a473e2cff428a3dbf13b4bec9325
refs/heads/master: f6e0213f7c253086e17844df8ba21075100b5ead
8 changes: 8 additions & 0 deletions trunk/arch/h8300/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,14 @@ config RWSEM_XCHGADD_ALGORITHM
bool
default n

config GENERIC_FIND_NEXT_BIT
bool
default y

config GENERIC_HWEIGHT
bool
default y

config GENERIC_CALIBRATE_DELAY
bool
default y
Expand Down
222 changes: 9 additions & 213 deletions trunk/include/asm-h8300/bitops.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@

#include <linux/config.h>
#include <linux/compiler.h>
#include <asm/byteorder.h> /* swab32 */
#include <asm/system.h>

#ifdef __KERNEL__
Expand Down Expand Up @@ -177,10 +176,7 @@ H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
#undef H8300_GEN_TEST_BITOP_CONST_INT
#undef H8300_GEN_TEST_BITOP

#define find_first_zero_bit(addr, size) \
find_next_zero_bit((addr), (size), 0)

#define ffs(x) generic_ffs(x)
#include <asm-generic/bitops/ffs.h>

static __inline__ unsigned long __ffs(unsigned long word)
{
Expand All @@ -196,216 +192,16 @@ static __inline__ unsigned long __ffs(unsigned long word)
return result;
}

static __inline__ int find_next_zero_bit (const unsigned long * addr, int size, int offset)
{
unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
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);
}

static __inline__ unsigned long find_next_bit(const unsigned long *addr,
unsigned long size, unsigned long offset)
{
unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
unsigned int result = offset & ~31UL;
unsigned int tmp;

if (offset >= size)
return size;
size -= result;
offset &= 31UL;
if (offset) {
tmp = *(p++);
tmp &= ~0UL << offset;
if (size < 32)
goto found_first;
if (tmp)
goto found_middle;
size -= 32;
result += 32;
}
while (size >= 32) {
if ((tmp = *p++) != 0)
goto found_middle;
result += 32;
size -= 32;
}
if (!size)
return result;
tmp = *p;

found_first:
tmp &= ~0UL >> (32 - size);
if (tmp == 0UL)
return result + size;
found_middle:
return result + __ffs(tmp);
}

#define find_first_bit(addr, size) find_next_bit(addr, size, 0)

/*
* 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(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)

static __inline__ int ext2_set_bit(int nr, volatile void * addr)
{
int mask, retval;
unsigned long flags;
volatile unsigned char *ADDR = (unsigned char *) addr;

ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
local_irq_save(flags);
retval = (mask & *ADDR) != 0;
*ADDR |= mask;
local_irq_restore(flags);
return retval;
}
#define ext2_set_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)

static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
{
int mask, retval;
unsigned long flags;
volatile unsigned char *ADDR = (unsigned char *) addr;

ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
local_irq_save(flags);
retval = (mask & *ADDR) != 0;
*ADDR &= ~mask;
local_irq_restore(flags);
return retval;
}
#define ext2_clear_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)

static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
{
int mask;
const volatile unsigned char *ADDR = (const unsigned char *) addr;

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(void *addr, unsigned long size, unsigned long offset)
{
unsigned long *p = ((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 performance, 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) __test_and_set_bit(nr,addr)
#define minix_set_bit(nr,addr) __set_bit(nr,addr)
#define minix_test_and_clear_bit(nr,addr) __test_and_clear_bit(nr,addr)
#define minix_test_bit(nr,addr) test_bit(nr,addr)
#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/ext2-non-atomic.h>
#include <asm-generic/bitops/ext2-atomic.h>
#include <asm-generic/bitops/minix.h>

#endif /* __KERNEL__ */

#define fls(x) generic_fls(x)
#define fls64(x) generic_fls64(x)
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/fls64.h>

#endif /* _H8300_BITOPS_H */

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