307 lines
7.2 KiB
C
307 lines
7.2 KiB
C
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __ASM_AVR32_BITOPS_H
|
|
#define __ASM_AVR32_BITOPS_H
|
|
|
|
#ifndef _LINUX_BITOPS_H
|
|
#error only <linux/bitops.h> can be included directly
|
|
#endif
|
|
|
|
#include <asm/byteorder.h>
|
|
#include <asm/system.h>
|
|
|
|
/*
|
|
* clear_bit() doesn't provide any barrier for the compiler
|
|
*/
|
|
#define smp_mb__before_clear_bit() barrier()
|
|
#define smp_mb__after_clear_bit() barrier()
|
|
|
|
/*
|
|
* set_bit - Atomically set a bit in memory
|
|
* @nr: the bit to set
|
|
* @addr: the address to start counting from
|
|
*
|
|
* This function is atomic and may not be reordered. See __set_bit()
|
|
* if you do not require the atomic guarantees.
|
|
*
|
|
* Note that @nr may be almost arbitrarily large; this function is not
|
|
* restricted to acting on a single-word quantity.
|
|
*/
|
|
static inline void set_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long tmp;
|
|
|
|
if (__builtin_constant_p(nr)) {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %2\n"
|
|
" sbr %0, %3\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p)
|
|
: "m"(*p), "i"(nr)
|
|
: "cc");
|
|
} else {
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %2\n"
|
|
" or %0, %3\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p)
|
|
: "m"(*p), "r"(mask)
|
|
: "cc");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* clear_bit - Clears a bit in memory
|
|
* @nr: Bit to clear
|
|
* @addr: Address to start counting from
|
|
*
|
|
* clear_bit() is atomic and may not be reordered. However, it does
|
|
* not contain a memory barrier, so if it is used for locking purposes,
|
|
* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
|
|
* in order to ensure changes are visible on other processors.
|
|
*/
|
|
static inline void clear_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long tmp;
|
|
|
|
if (__builtin_constant_p(nr)) {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %2\n"
|
|
" cbr %0, %3\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p)
|
|
: "m"(*p), "i"(nr)
|
|
: "cc");
|
|
} else {
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %2\n"
|
|
" andn %0, %3\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p)
|
|
: "m"(*p), "r"(mask)
|
|
: "cc");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* change_bit - Toggle a bit in memory
|
|
* @nr: Bit to change
|
|
* @addr: Address to start counting from
|
|
*
|
|
* change_bit() is atomic and may not be reordered.
|
|
* Note that @nr may be almost arbitrarily large; this function is not
|
|
* restricted to acting on a single-word quantity.
|
|
*/
|
|
static inline void change_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
unsigned long tmp;
|
|
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %2\n"
|
|
" eor %0, %3\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p)
|
|
: "m"(*p), "r"(mask)
|
|
: "cc");
|
|
}
|
|
|
|
/*
|
|
* test_and_set_bit - Set a bit and return its old value
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
static inline int test_and_set_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
unsigned long tmp, old;
|
|
|
|
if (__builtin_constant_p(nr)) {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %3\n"
|
|
" mov %2, %0\n"
|
|
" sbr %0, %4\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p), "=&r"(old)
|
|
: "m"(*p), "i"(nr)
|
|
: "memory", "cc");
|
|
} else {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %2, %3\n"
|
|
" or %0, %2, %4\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p), "=&r"(old)
|
|
: "m"(*p), "r"(mask)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/*
|
|
* test_and_clear_bit - Clear a bit and return its old value
|
|
* @nr: Bit to clear
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
static inline int test_and_clear_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
unsigned long tmp, old;
|
|
|
|
if (__builtin_constant_p(nr)) {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %3\n"
|
|
" mov %2, %0\n"
|
|
" cbr %0, %4\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p), "=&r"(old)
|
|
: "m"(*p), "i"(nr)
|
|
: "memory", "cc");
|
|
} else {
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %0, %3\n"
|
|
" mov %2, %0\n"
|
|
" andn %0, %4\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p), "=&r"(old)
|
|
: "m"(*p), "r"(mask)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/*
|
|
* test_and_change_bit - Change a bit and return its old value
|
|
* @nr: Bit to change
|
|
* @addr: Address to count from
|
|
*
|
|
* This operation is atomic and cannot be reordered.
|
|
* It also implies a memory barrier.
|
|
*/
|
|
static inline int test_and_change_bit(int nr, volatile void * addr)
|
|
{
|
|
unsigned long *p = ((unsigned long *)addr) + nr / BITS_PER_LONG;
|
|
unsigned long mask = 1UL << (nr % BITS_PER_LONG);
|
|
unsigned long tmp, old;
|
|
|
|
asm volatile(
|
|
"1: ssrf 5\n"
|
|
" ld.w %2, %3\n"
|
|
" eor %0, %2, %4\n"
|
|
" stcond %1, %0\n"
|
|
" brne 1b"
|
|
: "=&r"(tmp), "=o"(*p), "=&r"(old)
|
|
: "m"(*p), "r"(mask)
|
|
: "memory", "cc");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
/* Find First bit Set */
|
|
static inline unsigned long __ffs(unsigned long word)
|
|
{
|
|
unsigned long result;
|
|
|
|
asm("brev %1\n\t"
|
|
"clz %0,%1"
|
|
: "=r"(result), "=&r"(word)
|
|
: "1"(word));
|
|
return result;
|
|
}
|
|
|
|
/* Find First Zero */
|
|
static inline unsigned long ffz(unsigned long word)
|
|
{
|
|
return __ffs(~word);
|
|
}
|
|
|
|
/* Find Last bit Set */
|
|
static inline int fls(unsigned long word)
|
|
{
|
|
unsigned long result;
|
|
|
|
asm("clz %0,%1" : "=r"(result) : "r"(word));
|
|
return 32 - result;
|
|
}
|
|
|
|
static inline int __fls(unsigned long word)
|
|
{
|
|
return fls(word) - 1;
|
|
}
|
|
|
|
unsigned long find_first_zero_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
unsigned long find_next_zero_bit(const unsigned long *addr,
|
|
unsigned long size,
|
|
unsigned long offset);
|
|
unsigned long find_first_bit(const unsigned long *addr,
|
|
unsigned long size);
|
|
unsigned long find_next_bit(const unsigned long *addr,
|
|
unsigned long size,
|
|
unsigned long offset);
|
|
|
|
/*
|
|
* ffs: find first bit 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).
|
|
*
|
|
* The difference is that bit numbering starts at 1, and if no bit is set,
|
|
* the function returns 0.
|
|
*/
|
|
static inline int ffs(unsigned long word)
|
|
{
|
|
if(word == 0)
|
|
return 0;
|
|
return __ffs(word) + 1;
|
|
}
|
|
|
|
#include <asm-generic/bitops/fls64.h>
|
|
#include <asm-generic/bitops/sched.h>
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#include <asm-generic/bitops/lock.h>
|
|
|
|
#include <asm-generic/bitops/ext2-non-atomic.h>
|
|
#include <asm-generic/bitops/ext2-atomic.h>
|
|
#include <asm-generic/bitops/minix-le.h>
|
|
|
|
#endif /* __ASM_AVR32_BITOPS_H */
|