arch/metag/include/asm/atomic_lnkget.h

#ifndef __ASM_METAG_ATOMIC_LNKGET_H
#define __ASM_METAG_ATOMIC_LNKGET_H

#define ATOMIC_INIT(i)	{ (i) }

#define atomic_set(v, i)		((v)->counter = (i))

#include <linux/compiler.h>

#include <asm/barrier.h>

/*
 * None of these asm statements clobber memory as LNKSET writes around
 * the cache so the memory it modifies cannot safely be read by any means
 * other than these accessors.
 */

static inline int atomic_read(const atomic_t *v)
{
	int temp;

	asm volatile (
		"LNKGETD %0, [%1]\n"
		: "=da" (temp)
		: "da" (&v->counter));

	return temp;
}

static inline void atomic_add(int i, atomic_t *v)
{
	int temp;

	asm volatile (
		"1:	LNKGETD %0, [%1]\n"
		"	ADD	%0, %0, %2\n"
		"	LNKSETD [%1], %0\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		: "=&d" (temp)
		: "da" (&v->counter), "bd" (i)
		: "cc");
}

static inline void atomic_sub(int i, atomic_t *v)
{
	int temp;

	asm volatile (
		"1:	LNKGETD %0, [%1]\n"
		"	SUB	%0, %0, %2\n"
		"	LNKSETD [%1], %0\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ 1b\n"
		: "=&d" (temp)
		: "da" (&v->counter), "bd" (i)
		: "cc");
}

static inline int atomic_add_return(int i, atomic_t *v)
{
	int result, temp;

	smp_mb();

	asm volatile (
		"1:	LNKGETD %1, [%2]\n"
		"	ADD	%1, %1, %3\n"
		"	LNKSETD [%2], %1\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ 1b\n"
		: "=&d" (temp), "=&da" (result)
		: "da" (&v->counter), "bd" (i)
		: "cc");

	smp_mb();

	return result;
}

static inline int atomic_sub_return(int i, atomic_t *v)
{
	int result, temp;

	smp_mb();

	asm volatile (
		"1:	LNKGETD %1, [%2]\n"
		"	SUB	%1, %1, %3\n"
		"	LNKSETD [%2], %1\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		: "=&d" (temp), "=&da" (result)
		: "da" (&v->counter), "bd" (i)
		: "cc");

	smp_mb();

	return result;
}

static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
{
	int temp;

	asm volatile (
		"1:	LNKGETD %0, [%1]\n"
		"	AND	%0, %0, %2\n"
		"	LNKSETD	[%1] %0\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		: "=&d" (temp)
		: "da" (&v->counter), "bd" (~mask)
		: "cc");
}

static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
{
	int temp;

	asm volatile (
		"1:	LNKGETD %0, [%1]\n"
		"	OR	%0, %0, %2\n"
		"	LNKSETD	[%1], %0\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		: "=&d" (temp)
		: "da" (&v->counter), "bd" (mask)
		: "cc");
}

static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
	int result, temp;

	smp_mb();

	asm volatile (
		"1:	LNKGETD	%1, [%2]\n"
		"	CMP	%1, %3\n"
		"	LNKSETDEQ [%2], %4\n"
		"	BNE	2f\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		"2:\n"
		: "=&d" (temp), "=&d" (result)
		: "da" (&v->counter), "bd" (old), "da" (new)
		: "cc");

	smp_mb();

	return result;
}

static inline int atomic_xchg(atomic_t *v, int new)
{
	int temp, old;

	asm volatile (
		"1:	LNKGETD %1, [%2]\n"
		"	LNKSETD	[%2], %3\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		: "=&d" (temp), "=&d" (old)
		: "da" (&v->counter), "da" (new)
		: "cc");

	return old;
}

static inline int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int result, temp;

	smp_mb();

	asm volatile (
		"1:	LNKGETD %1, [%2]\n"
		"	CMP	%1, %3\n"
		"	ADD	%0, %1, %4\n"
		"	LNKSETDNE [%2], %0\n"
		"	BEQ	2f\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		"2:\n"
		: "=&d" (temp), "=&d" (result)
		: "da" (&v->counter), "bd" (u), "bd" (a)
		: "cc");

	smp_mb();

	return result;
}

static inline int atomic_sub_if_positive(int i, atomic_t *v)
{
	int result, temp;

	asm volatile (
		"1:	LNKGETD %1, [%2]\n"
		"	SUBS	%1, %1, %3\n"
		"	LNKSETDGE [%2], %1\n"
		"	BLT	2f\n"
		"	DEFR	%0, TXSTAT\n"
		"	ANDT	%0, %0, #HI(0x3f000000)\n"
		"	CMPT	%0, #HI(0x02000000)\n"
		"	BNZ	1b\n"
		"2:\n"
		: "=&d" (temp), "=&da" (result)
		: "da" (&v->counter), "bd" (i)
		: "cc");

	return result;
}

#endif /* __ASM_METAG_ATOMIC_LNKGET_H */