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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>
270 lines
6.2 KiB
C
270 lines
6.2 KiB
C
#ifndef _ASM_M32R_BITOPS_H
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#define _ASM_M32R_BITOPS_H
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/*
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* linux/include/asm-m32r/bitops.h
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*
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* Copyright 1992, Linus Torvalds.
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*
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* M32R version:
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* Copyright (C) 2001, 2002 Hitoshi Yamamoto
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#include <linux/compiler.h>
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#include <asm/assembler.h>
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#include <asm/system.h>
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#include <asm/byteorder.h>
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#include <asm/types.h>
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/*
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* These have to be done with inline assembly: that way the bit-setting
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* is guaranteed to be atomic. All bit operations return 0 if the bit
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* was cleared before the operation and != 0 if it was not.
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*
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* bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
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*/
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/**
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* set_bit - Atomically set a bit in memory
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* @nr: the bit to set
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* @addr: the address to start counting from
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*
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* This function is atomic and may not be reordered. See __set_bit()
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* if you do not require the atomic guarantees.
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* Note that @nr may be almost arbitrarily large; this function is not
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* restricted to acting on a single-word quantity.
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*/
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static __inline__ void set_bit(int nr, volatile void * addr)
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{
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__u32 mask;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "r6", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"or %0, %2; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (tmp)
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: "r" (a), "r" (mask)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r6"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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}
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/**
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* clear_bit - Clears a bit in memory
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* @nr: Bit to clear
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* @addr: Address to start counting from
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*
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* clear_bit() is atomic and may not be reordered. However, it does
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* not contain a memory barrier, so if it is used for locking purposes,
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* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
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* in order to ensure changes are visible on other processors.
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*/
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static __inline__ void clear_bit(int nr, volatile void * addr)
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{
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__u32 mask;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "r6", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"and %0, %2; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (tmp)
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: "r" (a), "r" (~mask)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r6"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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}
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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/**
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* change_bit - Toggle a bit in memory
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* @nr: Bit to clear
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* @addr: Address to start counting from
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*
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* change_bit() is atomic and may not be reordered.
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* Note that @nr may be almost arbitrarily large; this function is not
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* restricted to acting on a single-word quantity.
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*/
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static __inline__ void change_bit(int nr, volatile void * addr)
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{
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__u32 mask;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "r6", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"xor %0, %2; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (tmp)
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: "r" (a), "r" (mask)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r6"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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}
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/**
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* test_and_set_bit - Set a bit and return its old value
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This operation is atomic and cannot be reordered.
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* It also implies a memory barrier.
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*/
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static __inline__ int test_and_set_bit(int nr, volatile void * addr)
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{
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__u32 mask, oldbit;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "%1", "%2")
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M32R_LOCK" %0, @%2; \n\t"
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"mv %1, %0; \n\t"
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"and %0, %3; \n\t"
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"or %1, %3; \n\t"
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M32R_UNLOCK" %1, @%2; \n\t"
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: "=&r" (oldbit), "=&r" (tmp)
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: "r" (a), "r" (mask)
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: "memory"
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);
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local_irq_restore(flags);
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return (oldbit != 0);
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}
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/**
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* test_and_clear_bit - Clear a bit and return its old value
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This operation is atomic and cannot be reordered.
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* It also implies a memory barrier.
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*/
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static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
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{
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__u32 mask, oldbit;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "%1", "%3")
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M32R_LOCK" %0, @%3; \n\t"
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"mv %1, %0; \n\t"
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"and %0, %2; \n\t"
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"not %2, %2; \n\t"
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"and %1, %2; \n\t"
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M32R_UNLOCK" %1, @%3; \n\t"
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: "=&r" (oldbit), "=&r" (tmp), "+r" (mask)
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: "r" (a)
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: "memory"
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);
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local_irq_restore(flags);
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return (oldbit != 0);
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}
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/**
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* test_and_change_bit - Change a bit and return its old value
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This operation is atomic and cannot be reordered.
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* It also implies a memory barrier.
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*/
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static __inline__ int test_and_change_bit(int nr, volatile void * addr)
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{
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__u32 mask, oldbit;
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volatile __u32 *a = addr;
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unsigned long flags;
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unsigned long tmp;
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a += (nr >> 5);
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mask = (1 << (nr & 0x1F));
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local_irq_save(flags);
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__asm__ __volatile__ (
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DCACHE_CLEAR("%0", "%1", "%2")
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M32R_LOCK" %0, @%2; \n\t"
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"mv %1, %0; \n\t"
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"and %0, %3; \n\t"
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"xor %1, %3; \n\t"
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M32R_UNLOCK" %1, @%2; \n\t"
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: "=&r" (oldbit), "=&r" (tmp)
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: "r" (a), "r" (mask)
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: "memory"
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);
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local_irq_restore(flags);
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return (oldbit != 0);
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}
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#include <asm-generic/bitops/non-atomic.h>
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#include <asm-generic/bitops/ffz.h>
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#include <asm-generic/bitops/__ffs.h>
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#include <asm-generic/bitops/fls.h>
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#include <asm-generic/bitops/fls64.h>
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#ifdef __KERNEL__
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/ffs.h>
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/lock.h>
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#endif /* __KERNEL__ */
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#ifdef __KERNEL__
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#include <asm-generic/bitops/ext2-non-atomic.h>
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#include <asm-generic/bitops/ext2-atomic.h>
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#include <asm-generic/bitops/minix.h>
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#endif /* __KERNEL__ */
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#endif /* _ASM_M32R_BITOPS_H */
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