mirror of
https://github.com/torvalds/linux
synced 2024-09-22 03:55:39 +00:00
26333576fd
Introduce test_and_set_bit_lock / clear_bit_unlock bitops with lock semantics. Convert all architectures to use the generic implementation. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-By: David Howells <dhowells@redhat.com> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Bryan Wu <bryan.wu@analog.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Matthew Wilcox <willy@debian.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Andi Kleen <ak@muc.de> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
235 lines
6 KiB
C
235 lines
6 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 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 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__ int test_and_set_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long old;
|
|
unsigned long flags;
|
|
int set;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
old = *addr;
|
|
set = (old & mask) ? 1 : 0;
|
|
if (!set)
|
|
*addr = old | mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
|
|
return set;
|
|
}
|
|
|
|
static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
|
|
unsigned long old;
|
|
unsigned long flags;
|
|
int set;
|
|
|
|
addr += (nr >> SHIFT_PER_LONG);
|
|
_atomic_spin_lock_irqsave(addr, flags);
|
|
old = *addr;
|
|
set = (old & mask) ? 1 : 0;
|
|
if (set)
|
|
*addr = old & ~mask;
|
|
_atomic_spin_unlock_irqrestore(addr, flags);
|
|
|
|
return set;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
#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 CONFIG_64BIT
|
|
" 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;
|
|
}
|
|
|
|
#include <asm-generic/bitops/ffz.h>
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/lock.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#include <asm-generic/bitops/find.h>
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm-generic/bitops/ext2-non-atomic.h>
|
|
|
|
/* '3' is bits per byte */
|
|
#define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3)
|
|
|
|
#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__ */
|
|
|
|
#include <asm-generic/bitops/minix-le.h>
|
|
|
|
#endif /* _PARISC_BITOPS_H */
|