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#ifndef _H8300_BITOPS_H
#define _H8300_BITOPS_H
/*
* Copyright 1992, Linus Torvalds.
* Copyright 2002, Yoshinori Sato
*/
#include <linux/config.h>
#include <linux/compiler.h>
#include <asm/byteorder.h> /* swab32 */
#include <asm/system.h>
#ifdef __KERNEL__
/*
* Function prototypes to keep gcc -Wall happy
*/
/*
* 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;
result = -1;
__asm__("1:\n\t"
"shlr.l %2\n\t"
"adds #1,%0\n\t"
"bcs 1b"
: "=r" (result)
: "0" (result),"r" (word));
return result;
}
#define H8300_GEN_BITOP_CONST(OP,BIT) \
case BIT: \
__asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
break;
#define H8300_GEN_BITOP(FNAME,OP) \
static __inline__ void FNAME(int nr, volatile unsigned long* addr) \
{ \
volatile unsigned char *b_addr; \
b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
if (__builtin_constant_p(nr)) { \
switch(nr & 7) { \
H8300_GEN_BITOP_CONST(OP,0) \
H8300_GEN_BITOP_CONST(OP,1) \
H8300_GEN_BITOP_CONST(OP,2) \
H8300_GEN_BITOP_CONST(OP,3) \
H8300_GEN_BITOP_CONST(OP,4) \
H8300_GEN_BITOP_CONST(OP,5) \
H8300_GEN_BITOP_CONST(OP,6) \
H8300_GEN_BITOP_CONST(OP,7) \
} \
} else { \
__asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
} \
}
/*
* clear_bit() doesn't provide any barrier for the compiler.
*/
#define smp_mb__before_clear_bit() barrier()
#define smp_mb__after_clear_bit() barrier()
H8300_GEN_BITOP(set_bit ,"bset")
H8300_GEN_BITOP(clear_bit ,"bclr")
H8300_GEN_BITOP(change_bit,"bnot")
#define __set_bit(nr,addr) set_bit((nr),(addr))
#define __clear_bit(nr,addr) clear_bit((nr),(addr))
#define __change_bit(nr,addr) change_bit((nr),(addr))
#undef H8300_GEN_BITOP
#undef H8300_GEN_BITOP_CONST
static __inline__ int test_bit(int nr, const unsigned long* addr)
{
return (*((volatile unsigned char *)addr +
((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
}
#define __test_bit(nr, addr) test_bit(nr, addr)
#define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT) \
case BIT: \
__asm__("stc ccr,%w1\n\t" \
"orc #0x80,ccr\n\t" \
"bld #" #BIT ",@%4\n\t" \
OP " #" #BIT ",@%4\n\t" \
"rotxl.l %0\n\t" \
"ldc %w1,ccr" \
: "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
: "0" (retval),"r" (b_addr) \
: "memory"); \
break;
#define H8300_GEN_TEST_BITOP_CONST(OP,BIT) \
case BIT: \
__asm__("bld #" #BIT ",@%3\n\t" \
OP " #" #BIT ",@%3\n\t" \
"rotxl.l %0\n\t" \
: "=r"(retval),"=m"(*b_addr) \
: "0" (retval),"r" (b_addr) \
: "memory"); \
break;
#define H8300_GEN_TEST_BITOP(FNNAME,OP) \
static __inline__ int FNNAME(int nr, volatile void * addr) \
{ \
int retval = 0; \
char ccrsave; \
volatile unsigned char *b_addr; \
b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
if (__builtin_constant_p(nr)) { \
switch(nr & 7) { \
H8300_GEN_TEST_BITOP_CONST_INT(OP,0) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,1) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,2) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,3) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,4) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,5) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,6) \
H8300_GEN_TEST_BITOP_CONST_INT(OP,7) \
} \
} else { \
__asm__("stc ccr,%w1\n\t" \
"orc #0x80,ccr\n\t" \
"btst %w5,@%4\n\t" \
OP " %w5,@%4\n\t" \
"beq 1f\n\t" \
"inc.l #1,%0\n" \
"1:\n\t" \
"ldc %w1,ccr" \
: "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
: "0" (retval),"r" (b_addr),"r"(nr) \
: "memory"); \
} \
return retval; \
} \
\
static __inline__ int __ ## FNNAME(int nr, volatile void * addr) \
{ \
int retval = 0; \
volatile unsigned char *b_addr; \
b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
if (__builtin_constant_p(nr)) { \
switch(nr & 7) { \
H8300_GEN_TEST_BITOP_CONST(OP,0) \
H8300_GEN_TEST_BITOP_CONST(OP,1) \
H8300_GEN_TEST_BITOP_CONST(OP,2) \
H8300_GEN_TEST_BITOP_CONST(OP,3) \
H8300_GEN_TEST_BITOP_CONST(OP,4) \
H8300_GEN_TEST_BITOP_CONST(OP,5) \
H8300_GEN_TEST_BITOP_CONST(OP,6) \
H8300_GEN_TEST_BITOP_CONST(OP,7) \
} \
} else { \
__asm__("btst %w4,@%3\n\t" \
OP " %w4,@%3\n\t" \
"beq 1f\n\t" \
"inc.l #1,%0\n" \
"1:" \
: "=r"(retval),"=m"(*b_addr) \
: "0" (retval),"r" (b_addr),"r"(nr) \
: "memory"); \
} \
return retval; \
}
H8300_GEN_TEST_BITOP(test_and_set_bit, "bset")
H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
#undef H8300_GEN_TEST_BITOP_CONST
#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)
static __inline__ unsigned long __ffs(unsigned long word)
{
unsigned long result;
result = -1;
__asm__("1:\n\t"
"shlr.l %2\n\t"
"adds #1,%0\n\t"
"bcc 1b"
: "=r" (result)
: "0"(result),"r"(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)
#endif /* __KERNEL__ */
#define fls(x) generic_fls(x)
#endif /* _H8300_BITOPS_H */
|
