xref: /src/sys/arch/mvme68k/include/bus_space.h

/*	$NetBSD: bus_space.h,v 1.8.16.1 2006/06/21 14:54:01 yamt Exp $ */

/*-
 * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (C) 1997 Scott Reynolds.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Lifted from the Next68k port.
 * Modified for mvme68k by Steve Woodford.
 *
 * TODO: Support for VMEbus...
 * (Do any existing VME card drivers use bus_space_* ?)
 */

#ifndef _MVME68K_BUS_SPACE_H_
#define	_MVME68K_BUS_SPACE_H_

/*
 * Addresses (in bus space).
 */
typedef u_long bus_addr_t;
typedef u_long bus_size_t;

/*
 * Access methods for bus resources and address space.
 */
struct mvme68k_bus_space_tag;
typedef struct mvme68k_bus_space_tag	*bus_space_tag_t;
typedef u_long	bus_space_handle_t;

struct mvme68k_bus_space_tag {
	void		*bs_cookie;
	int		(*bs_map)(void *, bus_addr_t, bus_size_t,
				  int, bus_space_handle_t *);
	void		(*bs_unmap)(void *, bus_space_handle_t, bus_size_t);
	int		(*bs_peek_1)(void *, bus_space_handle_t,
				     bus_size_t, u_int8_t *);
	int		(*bs_peek_2)(void *, bus_space_handle_t,
				     bus_size_t, u_int16_t *);
	int		(*bs_peek_4)(void *, bus_space_handle_t,
				     bus_size_t, u_int32_t *);
#if 0
	int		(*bs_peek_8)(void *, bus_space_handle_t,
				     bus_size_t, u_int64_t *);
#endif
	int		(*bs_poke_1)(void *, bus_space_handle_t,
				     bus_size_t, u_int8_t);
	int		(*bs_poke_2)(void *, bus_space_handle_t,
				     bus_size_t, u_int16_t);
	int		(*bs_poke_4)(void *, bus_space_handle_t,
				     bus_size_t, u_int32_t);
#if 0
	int		(*bs_poke_8)(void *, bus_space_handle_t,
				     bus_size_t, u_int64_t);
#endif
};

/*
 *	int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
 *	                  bus_size_t size, int flags,
 *                        bus_space_handle_t *bshp);
 *
 * Map a region of bus space.
 */
#define	bus_space_map(tag, offset, size, flags, handlep)		\
    (*((tag)->bs_map))((tag)->bs_cookie, (offset), (size), (flags), (handlep))

/*
 * Possible values for the 'flags' parameter of bus_space_map()
 */
#define	BUS_SPACE_MAP_CACHEABLE		0x01
#define	BUS_SPACE_MAP_LINEAR		0x02
#define	BUS_SPACE_MAP_PREFETCHABLE	0x04

/*
 *	void bus_space_unmap(bus_space_tag_t t,
 *                           bus_space_handle_t bsh, bus_size_t size);
 *
 * Unmap a region of bus space.
 */
#define bus_space_unmap(tag, handle, size)				\
    (*((tag)->bs_unmap))((tag)->bs_cookie, (handle), (size))

/*
 *	int bus_space_subregion(bus_space_tag_t t, bus_space_handle_t h
 *	    bus_addr_t offset, bus_size_t size, bus_space_handle_t *newh);
 *
 * Allocate a sub-region of an existing map
 */
#define	bus_space_subregion(t, h, o, s, hp)				\
     ((*(hp)=(h)+(o)), 0)

/*
 * Allocation and deallocation operations.
 */
#define	bus_space_alloc(t, rs, re, s, a, b, f, ap, hp)  		\
     (-1)

#define	bus_space_free(t, h, s)

/*
 *	int bus_space_peek_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset, u_intN_t *valuep);
 *
 * Cautiously read 1, 2, 4 or 8 byte quantity from bus space described
 * by tag/handle/offset.
 * If no hardware responds to the read access, the function returns a
 * non-zero value. Otherwise the value read is placed in `valuep'.
 */
#define	bus_space_peek_1(t, h, o, vp)					\
    (*((t)->bs_peek_1))((t)->bs_cookie, (h), (o), (vp))

#define	bus_space_peek_2(t, h, o, vp)					\
    (*((t)->bs_peek_2))((t)->bs_cookie, (h), (o), (vp))

#define	bus_space_peek_4(t, h, o, vp)					\
    (*((t)->bs_peek_4))((t)->bs_cookie, (h), (o), (vp))

#if 0	/* Cause a link error for bus_space_peek_8 */
#define	bus_space_peek_8(t, h, o, vp)					\
    (*((t)->bs_peek_8))((t)->bs_cookie, (h), (o), (vp))
#endif

/*
 *	int bus_space_poke_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset, u_intN_t value);
 *
 * Cautiously write 1, 2, 4 or 8 byte quantity to bus space described
 * by tag/handle/offset.
 * If no hardware responds to the write access, the function returns a
 * non-zero value.
 */
#define	bus_space_poke_1(t, h, o, v)					\
    (*((t)->bs_poke_1))((t)->bs_cookie, (h), (o), (v))

#define	bus_space_poke_2(t, h, o, v)					\
    (*((t)->bs_poke_2))((t)->bs_cookie, (h), (o), (v))

#define	bus_space_poke_4(t, h, o, v)					\
    (*((t)->bs_poke_4))((t)->bs_cookie, (h), (o), (v))

#if 0	/* Cause a link error for bus_space_poke_8 */
#define	bus_space_poke_8(t, h, o, v)					\
    (*((t)->bs_poke_8))((t)->bs_cookie, (h), (o), (v))
#endif

/*
 *	u_intN_t bus_space_read_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset);
 *
 * Read a 1, 2, 4, or 8 byte quantity from bus space
 * described by tag/handle/offset.
 */
#define	bus_space_read_1(t,h,o)	\
	    (*((volatile u_int8_t *)(intptr_t)((h) + (o))))
#define	bus_space_read_2(t,h,o)	\
	    (*((volatile u_int16_t *)(intptr_t)((h) + (o))))
#define	bus_space_read_4(t,h,o)	\
	    (*((volatile u_int32_t *)(intptr_t)((h) + (o))))

/*
 *	void bus_space_read_multi_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    u_intN_t *addr, size_t count);
 *
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle/offset and copy into buffer provided.
 */

#define	bus_space_read_multi_1(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%a0@,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_read_multi_2(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%a0@,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_read_multi_4(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movl	%%a0@,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#if 0	/* Cause a link error for bus_space_read_multi_8 */
#define	bus_space_read_multi_8	!!! bus_space_read_multi_8 unimplemented !!!
#endif

/*
 *	void bus_space_read_region_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    u_intN_t *addr, size_t count);
 *
 * Read `count' 1, 2, 4, or 8 byte quantities from bus space
 * described by tag/handle and starting at `offset' and copy into
 * buffer provided.
 */

#define	bus_space_read_region_1(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%a0@+,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_read_region_2(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%a0@+,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_read_region_4(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movl	%%a0@+,%%a1@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#if 0	/* Cause a link error for bus_space_read_region_8 */
#define	bus_space_read_region_8	!!! bus_space_read_region_8 unimplemented !!!
#endif

/*
 *	void bus_space_write_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    u_intN_t value);
 *
 * Write the 1, 2, 4, or 8 byte value `value' to bus space
 * described by tag/handle/offset.
 */
#define	bus_space_write_1(t,h,o,v)					\
	do {								\
		*((volatile u_int8_t *)(intptr_t)((h) + (o))) = (v);	\
	} while (/*CONSTCOND*/0)
#define	bus_space_write_2(t,h,o,v)					\
	do {								\
		*((volatile u_int16_t *)(intptr_t)((h) + (o))) = (v);	\
	} while (/*CONSTCOND*/0)
#define	bus_space_write_4(t,h,o,v)					\
	do {								\
		*((volatile u_int32_t *)(intptr_t)((h) + (o))) = (v);	\
	} while (/*CONSTCOND*/0)

/*
 *	void bus_space_write_multi_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    const u_intN_t *addr, size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte quantities from the buffer
 * provided to bus space described by tag/handle/offset.
 */

#define	bus_space_write_multi_1(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%a1@+,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_write_multi_2(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%a1@+,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_write_multi_4(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movl	a1@+,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#if 0	/* Cause a link error for bus_space_write_8 */
#define	bus_space_write_multi_8(t, h, o, a, c)				\
			!!! bus_space_write_multi_8 unimplimented !!!
#endif

/*
 *	void bus_space_write_region_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    const u_intN_t *addr, size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte quantities from the buffer provided
 * to bus space described by tag/handle starting at `offset'.
 */

#define	bus_space_write_region_1(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%a1@+,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_write_region_2(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%a1@+,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#define	bus_space_write_region_4(t, h, o, a, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%a1					;	\
		movl	%2,%%d0					;	\
	1:	movl	%%a1@+,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (a), "g" (c)		:	\
		    "a0","a1","d0");					\
} while (0);

#if 0	/* Cause a link error for bus_space_write_region_8 */
#define	bus_space_write_region_8					\
			!!! bus_space_write_region_8 unimplemented !!!
#endif

/*
 *	void bus_space_set_multi_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset, u_intN_t val,
 *	    size_t count);
 *
 * Write the 1, 2, 4, or 8 byte value `val' to bus space described
 * by tag/handle/offset `count' times.
 */

#define	bus_space_set_multi_1(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%d1,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#define	bus_space_set_multi_2(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%d1,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#define	bus_space_set_multi_4(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movl	%%d1,%%a0@				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#if 0	/* Cause a link error for bus_space_set_multi_8 */
#define	bus_space_set_multi_8						\
			!!! bus_space_set_multi_8 unimplemented !!!
#endif

/*
 *	void bus_space_set_region_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset, u_intN_t val,
 *	    size_t count);
 *
 * Write `count' 1, 2, 4, or 8 byte value `val' to bus space described
 * by tag/handle starting at `offset'.
 */

#define	bus_space_set_region_1(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movb	%%d1,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#define	bus_space_set_region_2(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movw	%%d1,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#define	bus_space_set_region_4(t, h, o, val, c) do {			\
	(void) t;							\
	__asm volatile ("						\
		movl	%0,%%a0					;	\
		movl	%1,%%d1					;	\
		movl	%2,%%d0					;	\
	1:	movl	d1,%%a0@+				;	\
		subql	#1,%%d0					;	\
		jne	1b"					:	\
								:	\
		    "r" ((h) + (o)), "g" (val), "g" (c)		:	\
		    "a0","d0","d1");					\
} while (0);

#if 0	/* Cause a link error for bus_space_set_region_8 */
#define	bus_space_set_region_8						\
			!!! bus_space_set_region_8 unimplemented !!!
#endif

/*
 *	void bus_space_copy_N(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh1, bus_size_t off1,
 *	    bus_space_handle_t bsh2, bus_size_t off2,
 *	    size_t count);
 *
 * Copy `count' 1, 2, 4, or 8 byte values from bus space starting
 * at tag/bsh1/off1 to bus space starting at tag/bsh2/off2.
 */

#define	__MVME68K_copy_region_N(BYTES)					\
static __inline void __CONCAT(bus_space_copy_region_,BYTES)		\
	__P((bus_space_tag_t,						\
	    bus_space_handle_t bsh1, bus_size_t off1,			\
	    bus_space_handle_t bsh2, bus_size_t off2,			\
	    bus_size_t count));						\
									\
static __inline void							\
__CONCAT(bus_space_copy_region_,BYTES)(t, h1, o1, h2, o2, c)		\
	bus_space_tag_t t;						\
	bus_space_handle_t h1, h2;					\
	bus_size_t o1, o2, c;						\
{									\
	bus_size_t o;							\
									\
	if ((h1 + o1) >= (h2 + o2)) {					\
		/* src after dest: copy forward */			\
		for (o = 0; c != 0; c--, o += BYTES)			\
			__CONCAT(bus_space_write_,BYTES)(t, h2, o2 + o,	\
			    __CONCAT(bus_space_read_,BYTES)(t, h1, o1 + o)); \
	} else {							\
		/* dest after src: copy backwards */			\
		for (o = (c - 1) * BYTES; c != 0; c--, o -= BYTES)	\
			__CONCAT(bus_space_write_,BYTES)(t, h2, o2 + o,	\
			    __CONCAT(bus_space_read_,BYTES)(t, h1, o1 + o)); \
	}								\
}
__MVME68K_copy_region_N(1)
__MVME68K_copy_region_N(2)
__MVME68K_copy_region_N(4)
#if 0	/* Cause a link error for bus_space_copy_8 */
#define	bus_space_copy_8						\
			!!! bus_space_copy_8 unimplemented !!!
#endif

#undef __MVME68K_copy_region_N

/*
 * Bus read/write barrier methods.
 *
 *	void bus_space_barrier(bus_space_tag_t tag,
 *	    bus_space_handle_t bsh, bus_size_t offset,
 *	    bus_size_t len, int flags);
 *
 * Note: the 680x0 does not currently require barriers, but we must
 * provide the flags to MI code.
 */
#define	bus_space_barrier(t, h, o, l, f)	\
	((void)((void)(t), (void)(h), (void)(o), (void)(l), (void)(f)))
#define	BUS_SPACE_BARRIER_READ	0x01		/* force read barrier */
#define	BUS_SPACE_BARRIER_WRITE	0x02		/* force write barrier */

#define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t)


#ifdef _MVME68K_BUS_SPACE_PRIVATE
extern int _bus_space_map(void *, bus_addr_t, bus_size_t,
    int, bus_space_handle_t *);
extern void _bus_space_unmap(void *, bus_space_handle_t, bus_size_t);
extern int _bus_space_peek_1(void *, bus_space_handle_t,
    bus_size_t, u_int8_t *);
extern int _bus_space_peek_2(void *, bus_space_handle_t,
    bus_size_t, u_int16_t *);
extern int _bus_space_peek_4(void *, bus_space_handle_t,
    bus_size_t, u_int32_t *);
extern int _bus_space_poke_1(void *, bus_space_handle_t, bus_size_t, u_int8_t);
extern int _bus_space_poke_2(void *, bus_space_handle_t, bus_size_t, u_int16_t);
extern int _bus_space_poke_4(void *, bus_space_handle_t, bus_size_t, u_int32_t);
#endif /* _MVME68K_BUS_SPACE_PRIVATE */

#endif /* _MVME68K_BUS_SPACE_H_ */