original_kernel/include/asm-sparc/bitops.h

/* $Id: bitops.h,v 1.67 2001/11/19 18:36:34 davem Exp $
 * bitops.h: Bit string operations on the Sparc.
 *
 * Copyright 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright 1996 Eddie C. Dost   (ecd@skynet.be)
 * Copyright 2001 Anton Blanchard (anton@samba.org)
 */

#ifndef _SPARC_BITOPS_H
#define _SPARC_BITOPS_H

#include <linux/compiler.h>
#include <asm/byteorder.h>

#ifdef __KERNEL__

/*
 * Set bit 'nr' in 32-bit quantity at address 'addr' where bit '0'
 * is in the highest of the four bytes and bit '31' is the high bit
 * within the first byte. Sparc is BIG-Endian. Unless noted otherwise
 * all bit-ops return 0 if bit was previously clear and != 0 otherwise.
 */
static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___set_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
}

static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___set_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
}

static inline int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___clear_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
}

static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___clear_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
}

static inline int test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___change_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");

	return mask != 0;
}

static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
{
	register unsigned long mask asm("g2");
	register unsigned long *ADDR asm("g1");
	register int tmp1 asm("g3");
	register int tmp2 asm("g4");
	register int tmp3 asm("g5");
	register int tmp4 asm("g7");

	ADDR = ((unsigned long *) addr) + (nr >> 5);
	mask = 1 << (nr & 31);

	__asm__ __volatile__(
	"mov	%%o7, %%g4\n\t"
	"call	___change_bit\n\t"
	" add	%%o7, 8, %%o7\n"
	: "=&r" (mask), "=r" (tmp1), "=r" (tmp2), "=r" (tmp3), "=r" (tmp4)
	: "0" (mask), "r" (ADDR)
	: "memory", "cc");
}

#include <asm-generic/bitops/non-atomic.h>

#define smp_mb__before_clear_bit()	do { } while(0)
#define smp_mb__after_clear_bit()	do { } while(0)

#include <asm-generic/bitops/ffz.h>
#include <asm-generic/bitops/__ffs.h>
#include <asm-generic/bitops/sched.h>
#include <asm-generic/bitops/ffs.h>
#include <asm-generic/bitops/fls.h>
#include <asm-generic/bitops/fls64.h>
#include <asm-generic/bitops/hweight.h>
#include <asm-generic/bitops/find.h>
#include <asm-generic/bitops/ext2-non-atomic.h>
#include <asm-generic/bitops/ext2-atomic.h>
#include <asm-generic/bitops/minix.h>

#endif /* __KERNEL__ */

#endif /* defined(_SPARC_BITOPS_H) */