mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 10:01:43 +00:00
3156054b02
Noticed by Michael Tokarev add missing ()-pair in __ffz() macro for parisc Signed-off-by: Akinobu Mita <mita@miraclelinux.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
496 lines
13 KiB
C
496 lines
13 KiB
C
#ifndef _PARISC_BITOPS_H
|
|
#define _PARISC_BITOPS_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/types.h> /* for BITS_PER_LONG/SHIFT_PER_LONG */
|
|
#include <asm/byteorder.h>
|
|
#include <asm/atomic.h>
|
|
|
|
/*
|
|
* HP-PARISC specific bit operations
|
|
* for a detailed description of the functions please refer
|
|
* to include/asm-i386/bitops.h or kerneldoc
|
|
*/
|
|
|
|
#define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1))
|
|
|
|
|
|
#define smp_mb__before_clear_bit() smp_mb()
|
|
#define smp_mb__after_clear_bit() smp_mb()
|
|
|
|
/* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
|
|
* on use of volatile and __*_bit() (set/clear/change):
|
|
* *_bit() want use of volatile.
|
|
* __*_bit() are "relaxed" and don't use spinlock or volatile.
|
|
*/
|
|
|
|
static __inline__ void set_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
*addr |= mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
}
|
|
|
|
static __inline__ void __set_bit(unsigned long nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
|
|
|
|
*m |= 1UL << CHOP_SHIFTCOUNT(nr);
|
|
}
|
|
|
|
static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr));
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
*addr &= mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
}
|
|
|
|
static __inline__ void __clear_bit(unsigned long nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
|
|
|
|
*m &= ~(1UL << CHOP_SHIFTCOUNT(nr));
|
|
}
|
|
|
|
static __inline__ void change_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
*addr ^= mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
}
|
|
|
|
static __inline__ void __change_bit(unsigned long nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long *m = (unsigned long *) addr + (nr >> SHIFT_PER_LONG);
|
|
|
|
*m ^= 1UL << CHOP_SHIFTCOUNT(nr);
|
|
}
|
|
|
|
static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long oldbit;
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
oldbit = *addr;
|
|
*addr = oldbit | mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int __test_and_set_bit(int nr, volatile unsigned long * address)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long oldbit;
|
|
unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
|
|
|
|
oldbit = *addr;
|
|
*addr = oldbit | mask;
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long oldbit;
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
oldbit = *addr;
|
|
*addr = oldbit & ~mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long * address)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
|
|
unsigned long oldbit;
|
|
|
|
oldbit = *addr;
|
|
*addr = oldbit & ~mask;
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long oldbit;
|
|
unsigned long flags;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
oldbit = *addr;
|
|
*addr = oldbit ^ mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int __test_and_change_bit(int nr, volatile unsigned long * address)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long *addr = (unsigned long *)address + (nr >> SHIFT_PER_LONG);
|
|
unsigned long oldbit;
|
|
|
|
oldbit = *addr;
|
|
*addr = oldbit ^ mask;
|
|
|
|
return (oldbit & mask) ? 1 : 0;
|
|
}
|
|
|
|
static __inline__ int test_bit(int nr, const volatile unsigned long *address)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
const unsigned long *addr = (const unsigned long *)address + (nr >> SHIFT_PER_LONG);
|
|
|
|
return !!(*addr & mask);
|
|
}
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/**
|
|
* __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1".
|
|
* @word: The word to search
|
|
*
|
|
* __ffs() return is undefined if no bit is set.
|
|
*
|
|
* 32-bit fast __ffs by LaMont Jones "lamont At hp com".
|
|
* 64-bit enhancement by Grant Grundler "grundler At parisc-linux org".
|
|
* (with help from willy/jejb to get the semantics right)
|
|
*
|
|
* This algorithm avoids branches by making use of nullification.
|
|
* One side effect of "extr" instructions is it sets PSW[N] bit.
|
|
* How PSW[N] (nullify next insn) gets set is determined by the
|
|
* "condition" field (eg "<>" or "TR" below) in the extr* insn.
|
|
* Only the 1st and one of either the 2cd or 3rd insn will get executed.
|
|
* Each set of 3 insn will get executed in 2 cycles on PA8x00 vs 16 or so
|
|
* cycles for each mispredicted branch.
|
|
*/
|
|
|
|
static __inline__ unsigned long __ffs(unsigned long x)
|
|
{
|
|
unsigned long ret;
|
|
|
|
__asm__(
|
|
#ifdef __LP64__
|
|
" ldi 63,%1\n"
|
|
" extrd,u,*<> %0,63,32,%%r0\n"
|
|
" extrd,u,*TR %0,31,32,%0\n" /* move top 32-bits down */
|
|
" addi -32,%1,%1\n"
|
|
#else
|
|
" ldi 31,%1\n"
|
|
#endif
|
|
" extru,<> %0,31,16,%%r0\n"
|
|
" extru,TR %0,15,16,%0\n" /* xxxx0000 -> 0000xxxx */
|
|
" addi -16,%1,%1\n"
|
|
" extru,<> %0,31,8,%%r0\n"
|
|
" extru,TR %0,23,8,%0\n" /* 0000xx00 -> 000000xx */
|
|
" addi -8,%1,%1\n"
|
|
" extru,<> %0,31,4,%%r0\n"
|
|
" extru,TR %0,27,4,%0\n" /* 000000x0 -> 0000000x */
|
|
" addi -4,%1,%1\n"
|
|
" extru,<> %0,31,2,%%r0\n"
|
|
" extru,TR %0,29,2,%0\n" /* 0000000y, 1100b -> 0011b */
|
|
" addi -2,%1,%1\n"
|
|
" extru,= %0,31,1,%%r0\n" /* check last bit */
|
|
" addi -1,%1,%1\n"
|
|
: "+r" (x), "=r" (ret) );
|
|
return ret;
|
|
}
|
|
|
|
/* Undefined if no bit is zero. */
|
|
#define ffz(x) __ffs(~(x))
|
|
|
|
/*
|
|
* ffs: find first bit set. returns 1 to BITS_PER_LONG or 0 (if none set)
|
|
* This is defined the same way as the libc and compiler builtin
|
|
* ffs routines, therefore differs in spirit from the above ffz (man ffs).
|
|
*/
|
|
static __inline__ int ffs(int x)
|
|
{
|
|
return x ? (__ffs((unsigned long)x) + 1) : 0;
|
|
}
|
|
|
|
/*
|
|
* fls: find last (most significant) bit set.
|
|
* fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
|
|
static __inline__ int fls(int x)
|
|
{
|
|
int ret;
|
|
if (!x)
|
|
return 0;
|
|
|
|
__asm__(
|
|
" ldi 1,%1\n"
|
|
" extru,<> %0,15,16,%%r0\n"
|
|
" zdep,TR %0,15,16,%0\n" /* xxxx0000 */
|
|
" addi 16,%1,%1\n"
|
|
" extru,<> %0,7,8,%%r0\n"
|
|
" zdep,TR %0,23,24,%0\n" /* xx000000 */
|
|
" addi 8,%1,%1\n"
|
|
" extru,<> %0,3,4,%%r0\n"
|
|
" zdep,TR %0,27,28,%0\n" /* x0000000 */
|
|
" addi 4,%1,%1\n"
|
|
" extru,<> %0,1,2,%%r0\n"
|
|
" zdep,TR %0,29,30,%0\n" /* y0000000 (y&3 = 0) */
|
|
" addi 2,%1,%1\n"
|
|
" extru,= %0,0,1,%%r0\n"
|
|
" addi 1,%1,%1\n" /* if y & 8, add 1 */
|
|
: "+r" (x), "=r" (ret) );
|
|
|
|
return ret;
|
|
}
|
|
#define fls64(x) generic_fls64(x)
|
|
|
|
/*
|
|
* hweightN: returns the hamming weight (i.e. the number
|
|
* of bits set) of a N-bit word
|
|
*/
|
|
#define hweight64(x) generic_hweight64(x)
|
|
#define hweight32(x) generic_hweight32(x)
|
|
#define hweight16(x) generic_hweight16(x)
|
|
#define hweight8(x) generic_hweight8(x)
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
#ifdef __LP64__
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (unlikely(b[1]))
|
|
return __ffs(b[1]) + 64;
|
|
return __ffs(b[2]) + 128;
|
|
#else
|
|
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;
|
|
#endif
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
/*
|
|
* This implementation of find_{first,next}_zero_bit was stolen from
|
|
* Linus' asm-alpha/bitops.h.
|
|
*/
|
|
#define find_first_zero_bit(addr, size) \
|
|
find_next_zero_bit((addr), (size), 0)
|
|
|
|
static __inline__ unsigned long find_next_zero_bit(const void * addr, unsigned long size, unsigned long offset)
|
|
{
|
|
const unsigned long * p = ((unsigned long *) addr) + (offset >> SHIFT_PER_LONG);
|
|
unsigned long result = offset & ~(BITS_PER_LONG-1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG-1);
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp |= ~0UL >> (BITS_PER_LONG-offset);
|
|
if (size < BITS_PER_LONG)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= BITS_PER_LONG;
|
|
result += BITS_PER_LONG;
|
|
}
|
|
while (size & ~(BITS_PER_LONG -1)) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
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)
|
|
{
|
|
const unsigned long *p = addr + (offset >> SHIFT_PER_LONG);
|
|
unsigned long result = offset & ~(BITS_PER_LONG-1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG-1);
|
|
if (offset) {
|
|
tmp = *(p++);
|
|
tmp &= (~0UL << offset);
|
|
if (size < BITS_PER_LONG)
|
|
goto found_first;
|
|
if (tmp)
|
|
goto found_middle;
|
|
size -= BITS_PER_LONG;
|
|
result += BITS_PER_LONG;
|
|
}
|
|
while (size & ~(BITS_PER_LONG-1)) {
|
|
if ((tmp = *(p++)))
|
|
goto found_middle;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp &= (~0UL >> (BITS_PER_LONG - size));
|
|
if (tmp == 0UL) /* Are any bits set? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + __ffs(tmp);
|
|
}
|
|
|
|
/**
|
|
* find_first_bit - find the first set bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit-number of the first set bit, not the number of the byte
|
|
* containing a bit.
|
|
*/
|
|
#define find_first_bit(addr, size) \
|
|
find_next_bit((addr), (size), 0)
|
|
|
|
#define _EXT2_HAVE_ASM_BITOPS_
|
|
|
|
#ifdef __KERNEL__
|
|
/*
|
|
* test_and_{set,clear}_bit guarantee atomicity without
|
|
* disabling interrupts.
|
|
*/
|
|
|
|
/* '3' is bits per byte */
|
|
#define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3)
|
|
|
|
#define ext2_test_bit(nr, addr) \
|
|
test_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
|
|
#define ext2_set_bit(nr, addr) \
|
|
__test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
|
|
#define ext2_clear_bit(nr, addr) \
|
|
__test_and_clear_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
|
|
|
|
#define ext2_set_bit_atomic(l,nr,addr) \
|
|
test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
|
|
#define ext2_clear_bit_atomic(l,nr,addr) \
|
|
test_and_clear_bit( (nr) ^ LE_BYTE_ADDR, (unsigned long *)addr)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
|
|
#define ext2_find_first_zero_bit(addr, size) \
|
|
ext2_find_next_zero_bit((addr), (size), 0)
|
|
|
|
/* include/linux/byteorder does not support "unsigned long" type */
|
|
static inline unsigned long ext2_swabp(unsigned long * x)
|
|
{
|
|
#ifdef __LP64__
|
|
return (unsigned long) __swab64p((u64 *) x);
|
|
#else
|
|
return (unsigned long) __swab32p((u32 *) x);
|
|
#endif
|
|
}
|
|
|
|
/* include/linux/byteorder doesn't support "unsigned long" type */
|
|
static inline unsigned long ext2_swab(unsigned long y)
|
|
{
|
|
#ifdef __LP64__
|
|
return (unsigned long) __swab64((u64) y);
|
|
#else
|
|
return (unsigned long) __swab32((u32) y);
|
|
#endif
|
|
}
|
|
|
|
static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
|
|
{
|
|
unsigned long *p = (unsigned long *) addr + (offset >> SHIFT_PER_LONG);
|
|
unsigned long result = offset & ~(BITS_PER_LONG - 1);
|
|
unsigned long tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= (BITS_PER_LONG - 1UL);
|
|
if (offset) {
|
|
tmp = ext2_swabp(p++);
|
|
tmp |= (~0UL >> (BITS_PER_LONG - offset));
|
|
if (size < BITS_PER_LONG)
|
|
goto found_first;
|
|
if (~tmp)
|
|
goto found_middle;
|
|
size -= BITS_PER_LONG;
|
|
result += BITS_PER_LONG;
|
|
}
|
|
|
|
while (size & ~(BITS_PER_LONG - 1)) {
|
|
if (~(tmp = *(p++)))
|
|
goto found_middle_swap;
|
|
result += BITS_PER_LONG;
|
|
size -= BITS_PER_LONG;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = ext2_swabp(p);
|
|
found_first:
|
|
tmp |= ~0UL << size;
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. Skip ffz */
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
|
|
found_middle_swap:
|
|
return result + ffz(ext2_swab(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) ((void)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 /* _PARISC_BITOPS_H */
|