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96b8d4c19d
Like fls, but can't be handed 0 and returns the bit number. (I broke this arch in linux-next by using __fls in generic code). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
306 lines
7.2 KiB
C
306 lines
7.2 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_AVR32_BITOPS_H
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#define __ASM_AVR32_BITOPS_H
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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#include <asm/byteorder.h>
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#include <asm/system.h>
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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() barrier()
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#define smp_mb__after_clear_bit() barrier()
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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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*
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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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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long tmp;
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if (__builtin_constant_p(nr)) {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %2\n"
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" sbr %0, %3\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p)
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: "m"(*p), "i"(nr)
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: "cc");
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} else {
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %2\n"
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" or %0, %3\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p)
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: "m"(*p), "r"(mask)
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: "cc");
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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(int nr, volatile void * addr)
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{
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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long tmp;
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if (__builtin_constant_p(nr)) {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %2\n"
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" cbr %0, %3\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p)
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: "m"(*p), "i"(nr)
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: "cc");
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} else {
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %2\n"
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" andn %0, %3\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p)
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: "m"(*p), "r"(mask)
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: "cc");
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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(int nr, volatile void * addr)
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{
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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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unsigned long tmp;
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %2\n"
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" eor %0, %3\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p)
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: "m"(*p), "r"(mask)
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: "cc");
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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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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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unsigned long tmp, old;
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if (__builtin_constant_p(nr)) {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %3\n"
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" mov %2, %0\n"
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" sbr %0, %4\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p), "=&r"(old)
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: "m"(*p), "i"(nr)
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: "memory", "cc");
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} else {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %2, %3\n"
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" or %0, %2, %4\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p), "=&r"(old)
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: "m"(*p), "r"(mask)
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: "memory", "cc");
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}
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return (old & mask) != 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 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(int nr, volatile void * addr)
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{
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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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unsigned long tmp, old;
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if (__builtin_constant_p(nr)) {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %3\n"
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" mov %2, %0\n"
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" cbr %0, %4\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p), "=&r"(old)
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: "m"(*p), "i"(nr)
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: "memory", "cc");
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} else {
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %0, %3\n"
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" mov %2, %0\n"
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" andn %0, %4\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p), "=&r"(old)
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: "m"(*p), "r"(mask)
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: "memory", "cc");
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}
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return (old & mask) != 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 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(int nr, volatile void * addr)
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{
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unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
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unsigned long mask = 1UL << (nr % BITS_PER_LONG);
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unsigned long tmp, old;
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asm volatile(
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"1: ssrf 5\n"
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" ld.w %2, %3\n"
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" eor %0, %2, %4\n"
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" stcond %1, %0\n"
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" brne 1b"
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: "=&r"(tmp), "=o"(*p), "=&r"(old)
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: "m"(*p), "r"(mask)
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: "memory", "cc");
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return (old & mask) != 0;
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}
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#include <asm-generic/bitops/non-atomic.h>
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/* Find First bit Set */
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static inline unsigned long __ffs(unsigned long word)
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{
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unsigned long result;
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asm("brev %1\n\t"
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"clz %0,%1"
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: "=r"(result), "=&r"(word)
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: "1"(word));
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return result;
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}
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/* Find First Zero */
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static inline unsigned long ffz(unsigned long word)
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{
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return __ffs(~word);
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}
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/* Find Last bit Set */
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static inline int fls(unsigned long word)
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{
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unsigned long result;
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asm("clz %0,%1" : "=r"(result) : "r"(word));
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return 32 - result;
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}
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static inline int __fls(unsigned long word)
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{
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return fls(word) - 1;
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}
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unsigned long find_first_zero_bit(const unsigned long *addr,
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unsigned long size);
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unsigned long find_next_zero_bit(const unsigned long *addr,
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unsigned long size,
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unsigned long offset);
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unsigned long find_first_bit(const unsigned long *addr,
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unsigned long size);
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unsigned long find_next_bit(const unsigned long *addr,
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unsigned long size,
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unsigned long offset);
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/*
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* ffs: find first bit set. 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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* The difference is that bit numbering starts at 1, and if no bit is set,
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* the function returns 0.
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*/
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static inline int ffs(unsigned long word)
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{
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if(word == 0)
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return 0;
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return __ffs(word) + 1;
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}
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#include <asm-generic/bitops/fls64.h>
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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/lock.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-le.h>
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#endif /* __ASM_AVR32_BITOPS_H */
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