511 lines
12 KiB
C
511 lines
12 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 1994 - 1997, 1999, 2000 Ralf Baechle (ralf@gnu.org)
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* Copyright (c) 1999, 2000 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_BITOPS_H
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#define _ASM_BITOPS_H
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#include <linux/compiler.h>
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#include <linux/irqflags.h>
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#include <linux/types.h>
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#include <asm/bug.h>
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#include <asm/byteorder.h> /* sigh ... */
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#include <asm/cpu-features.h>
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#include <asm/sgidefs.h>
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#include <asm/war.h>
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#if (_MIPS_SZLONG == 32)
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#define SZLONG_LOG 5
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#define SZLONG_MASK 31UL
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#define __LL "ll "
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#define __SC "sc "
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#define cpu_to_lelongp(x) cpu_to_le32p((__u32 *) (x))
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#elif (_MIPS_SZLONG == 64)
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#define SZLONG_LOG 6
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#define SZLONG_MASK 63UL
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#define __LL "lld "
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#define __SC "scd "
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#define cpu_to_lelongp(x) cpu_to_le64p((__u64 *) (x))
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#endif
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/*
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* clear_bit() doesn't provide any barrier for the compiler.
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*/
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#define smp_mb__before_clear_bit() smp_mb()
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#define smp_mb__after_clear_bit() smp_mb()
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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(unsigned long nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # set_bit \n"
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" or %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqzl %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # set_bit \n"
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" or %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqz %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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*a |= mask;
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local_irq_restore(flags);
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}
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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(unsigned long nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp;
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # clear_bit \n"
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" and %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqzl %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
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} else if (cpu_has_llsc) {
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # clear_bit \n"
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" and %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqz %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (~(1UL << (nr & SZLONG_MASK))), "m" (*m));
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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*a &= ~mask;
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local_irq_restore(flags);
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}
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}
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/*
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* change_bit - Toggle a bit in memory
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* @nr: Bit to change
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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(unsigned long nr, volatile unsigned long *addr)
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{
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # change_bit \n"
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" xor %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqzl %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
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} else if (cpu_has_llsc) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # change_bit \n"
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" xor %0, %2 \n"
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" " __SC "%0, %1 \n"
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" beqz %0, 1b \n"
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m)
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: "ir" (1UL << (nr & SZLONG_MASK)), "m" (*m));
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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*a ^= mask;
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local_irq_restore(flags);
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}
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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(unsigned long nr,
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volatile unsigned long *addr)
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{
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_set_bit \n"
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" or %2, %0, %3 \n"
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" " __SC "%2, %1 \n"
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" beqzl %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else if (cpu_has_llsc) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set push \n"
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" .set noreorder \n"
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_set_bit \n"
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" or %2, %0, %3 \n"
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" " __SC "%2, %1 \n"
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" beqz %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set pop \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask;
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int retval;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a |= mask;
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local_irq_restore(flags);
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return retval;
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}
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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 clear
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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(unsigned long nr,
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volatile unsigned long *addr)
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{
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_clear_bit \n"
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" or %2, %0, %3 \n"
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" xor %2, %3 \n"
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" " __SC "%2, %1 \n"
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" beqzl %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else if (cpu_has_llsc) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set push \n"
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" .set noreorder \n"
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_clear_bit \n"
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" or %2, %0, %3 \n"
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" xor %2, %3 \n"
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" " __SC "%2, %1 \n"
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" beqz %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set pop \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask;
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int retval;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a &= ~mask;
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local_irq_restore(flags);
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return retval;
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}
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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 change
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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(unsigned long nr,
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volatile unsigned long *addr)
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{
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if (cpu_has_llsc && R10000_LLSC_WAR) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_change_bit \n"
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" xor %2, %0, %3 \n"
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" " __SC "%2, %1 \n"
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" beqzl %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set mips0 \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else if (cpu_has_llsc) {
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unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
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unsigned long temp, res;
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__asm__ __volatile__(
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" .set push \n"
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" .set noreorder \n"
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" .set mips3 \n"
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"1: " __LL "%0, %1 # test_and_change_bit \n"
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" xor %2, %0, %3 \n"
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" " __SC "\t%2, %1 \n"
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" beqz %2, 1b \n"
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" and %2, %0, %3 \n"
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#ifdef CONFIG_SMP
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" sync \n"
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#endif
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" .set pop \n"
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: "=&r" (temp), "=m" (*m), "=&r" (res)
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: "r" (1UL << (nr & SZLONG_MASK)), "m" (*m)
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: "memory");
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return res != 0;
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} else {
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volatile unsigned long *a = addr;
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unsigned long mask, retval;
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unsigned long flags;
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a += nr >> SZLONG_LOG;
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mask = 1UL << (nr & SZLONG_MASK);
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local_irq_save(flags);
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retval = (mask & *a) != 0;
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*a ^= mask;
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local_irq_restore(flags);
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return retval;
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}
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}
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#include <asm-generic/bitops/non-atomic.h>
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/*
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* Return the bit position (0..63) of the most significant 1 bit in a word
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* Returns -1 if no 1 bit exists
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*/
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static inline int __ilog2(unsigned long x)
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{
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int lz;
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if (sizeof(x) == 4) {
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__asm__ (
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" .set push \n"
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" .set mips32 \n"
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" clz %0, %1 \n"
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" .set pop \n"
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: "=r" (lz)
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: "r" (x));
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return 31 - lz;
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}
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BUG_ON(sizeof(x) != 8);
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__asm__ (
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" .set push \n"
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" .set mips64 \n"
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" dclz %0, %1 \n"
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" .set pop \n"
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: "=r" (lz)
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: "r" (x));
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return 63 - lz;
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}
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#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
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/*
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Returns 0..SZLONG-1
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static inline unsigned long __ffs(unsigned long word)
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{
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return __ilog2(word & -word);
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}
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/*
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* fls - find last bit set.
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* @word: The word to search
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*
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* This is defined the same way as ffs.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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static inline int fls(int word)
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{
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__asm__ ("clz %0, %1" : "=r" (word) : "r" (word));
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return 32 - word;
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}
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#if defined(CONFIG_64BIT) && defined(CONFIG_CPU_MIPS64)
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static inline int fls64(__u64 word)
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{
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__asm__ ("dclz %0, %1" : "=r" (word) : "r" (word));
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return 64 - word;
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}
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#else
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#include <asm-generic/bitops/fls64.h>
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#endif
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/*
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* ffs - find first bit set.
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* @word: The word to search
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*
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* This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(int word)
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{
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if (!word)
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return 0;
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return fls(word & -word);
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}
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#else
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#include <asm-generic/bitops/__ffs.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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#endif /*defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) */
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#include <asm-generic/bitops/ffz.h>
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#include <asm-generic/bitops/find.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/hweight.h>
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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_BITOPS_H */
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