[urcu.git] / arch_ppc.h

#ifndef _ARCH_PPC_H
#define _ARCH_PPC_H

/*
 * arch_ppc.h: trivial definitions for the powerpc architecture.
 *
 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
*
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <compiler.h>
#include <arch_atomic.h>

#define CONFIG_HAVE_FENCE 1
#define CONFIG_HAVE_MEM_COHERENCY

#ifndef BITS_PER_LONG
#define BITS_PER_LONG	(__SIZEOF_LONG__ * 8)
#endif

#define mb()    asm volatile("sync":::"memory")
#define rmb()   asm volatile("sync":::"memory")
#define wmb()   asm volatile("sync"::: "memory")

/*
 * Architectures without cache coherency need something like the following:
 *
 * #define mb()		mc()
 * #define rmb()	rmc()
 * #define wmb()	wmc()
 * #define mc()		arch_cache_flush()
 * #define rmc()	arch_cache_flush_read()
 * #define wmc()	arch_cache_flush_write()
 */

#define mc()	barrier()
#define rmc()	barrier()
#define wmc()	barrier()

/* Assume SMP machine, given we don't have this information */
#define CONFIG_SMP 1

#ifdef CONFIG_SMP
#define smp_mb()	mb()
#define smp_rmb()	rmb()
#define smp_wmb()	wmb()
#define smp_mc()	mc()
#define smp_rmc()	rmc()
#define smp_wmc()	wmc()
#else
#define smp_mb()	barrier()
#define smp_rmb()	barrier()
#define smp_wmb()	barrier()
#define smp_mc()	barrier()
#define smp_rmc()	barrier()
#define smp_wmc()	barrier()
#endif

/* Nop everywhere except on alpha. */
#define smp_read_barrier_depends()

static inline void cpu_relax(void)
{
	barrier();
}

#define mftbl()						\
	({ 						\
		unsigned long rval;			\
		asm volatile("mftbl %0" : "=r" (rval));	\
		rval;					\
	})

#define mftbu()						\
	({						\
		unsigned long rval;			\
		asm volatile("mftbu %0" : "=r" (rval));	\
		rval;					\
	})

typedef unsigned long long cycles_t;

static inline cycles_t get_cycles (void)
{
	long h, l;

	for (;;) {
		h = mftbu();
		barrier();
		l = mftbl();
		barrier();
		if (mftbu() == h)
			return (((cycles_t) h) << 32) + l;
	}
}

#endif /* _ARCH_PPC_H */
Commit	Line	Data
121a5d44 MD	1	#ifndef _ARCH_PPC_H
	2	#define _ARCH_PPC_H
	3
6d0ce021	4	/*
af02d47e	5	* arch_ppc.h: trivial definitions for the powerpc architecture.
6d0ce021	6	*
af02d47e MD	7	* Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
af02d47e MD	8	* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
6d0ce021	9	*
af02d47e MD	10	* This library is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU Lesser General Public
	12	* License as published by the Free Software Foundation; either
	13	* version 2.1 of the License, or (at your option) any later version.
	14	*
	15	* This library is distributed in the hope that it will be useful,
6d0ce021	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
af02d47e MD	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
af02d47e MD	18	* Lesser General Public License for more details.
6d0ce021	19	*
af02d47e MD	20	* You should have received a copy of the GNU Lesser General Public
	21	* License along with this library; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
6d0ce021 PM	23	*/
6d0ce021 PM	24
121a5d44	25	#include <compiler.h>
0114ba7f	26	#include <arch_atomic.h>
121a5d44	27
6d0ce021 PM	28	#define CONFIG_HAVE_FENCE 1
	29	#define CONFIG_HAVE_MEM_COHERENCY
	30
af02d47e	31	#ifndef BITS_PER_LONG
41e6b690	32	#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
af02d47e MD	33	#endif
af02d47e MD	34
6d0ce021 PM	35	#define mb() asm volatile("sync":::"memory")
	36	#define rmb() asm volatile("sync":::"memory")
	37	#define wmb() asm volatile("sync"::: "memory")
	38
	39	/*
	40	* Architectures without cache coherency need something like the following:
	41	*
	42	* #define mb() mc()
	43	* #define rmb() rmc()
	44	* #define wmb() wmc()
	45	* #define mc() arch_cache_flush()
	46	* #define rmc() arch_cache_flush_read()
	47	* #define wmc() arch_cache_flush_write()
	48	*/
	49
	50	#define mc() barrier()
	51	#define rmc() barrier()
	52	#define wmc() barrier()
	53
121a5d44 MD	54	/* Assume SMP machine, given we don't have this information */
	55	#define CONFIG_SMP 1
	56
	57	#ifdef CONFIG_SMP
	58	#define smp_mb() mb()
	59	#define smp_rmb() rmb()
	60	#define smp_wmb() wmb()
	61	#define smp_mc() mc()
	62	#define smp_rmc() rmc()
	63	#define smp_wmc() wmc()
	64	#else
	65	#define smp_mb() barrier()
	66	#define smp_rmb() barrier()
	67	#define smp_wmb() barrier()
	68	#define smp_mc() barrier()
	69	#define smp_rmc() barrier()
	70	#define smp_wmc() barrier()
	71	#endif
	72
	73	/* Nop everywhere except on alpha. */
	74	#define smp_read_barrier_depends()
	75
6d0ce021 PM	76	static inline void cpu_relax(void)
	77	{
	78	barrier();
	79	}
	80
af02d47e MD	81	#define mftbl() \
	82	({ \
	83	unsigned long rval; \
	84	asm volatile("mftbl %0" : "=r" (rval)); \
	85	rval; \
	86	})
	87
	88	#define mftbu() \
	89	({ \
	90	unsigned long rval; \
	91	asm volatile("mftbu %0" : "=r" (rval)); \
	92	rval; \
	93	})
6d0ce021 PM	94
	95	typedef unsigned long long cycles_t;
	96
	97	static inline cycles_t get_cycles (void)
	98	{
af02d47e	99	long h, l;
6d0ce021 PM	100
	101	for (;;) {
	102	h = mftbu();
af02d47e	103	barrier();
6d0ce021	104	l = mftbl();
af02d47e	105	barrier();
6d0ce021	106	if (mftbu() == h)
af02d47e	107	return (((cycles_t) h) << 32) + l;
6d0ce021 PM	108	}
6d0ce021 PM	109	}
121a5d44 MD	110
121a5d44 MD	111	#endif /* _ARCH_PPC_H */