/*      $NetBSD: bus_space_simple.h,v 1.4 2026/07/04 22:59:07 thorpej 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.
 *
 * 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.
 */

#ifndef _M68K_BUS_SPACE_SIMPLE_H_
#define _M68K_BUS_SPACE_SIMPLE_H_

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

#define PRIxBUSADDR     "lx"
#define PRIxBUSSIZE     "lx"
#define PRIuBUSSIZE     "lu"

/*
 * Access methods for bus resources and address space.
 */
struct m68k_simple_bus_space_tag;
typedef struct m68k_simple_bus_space_tag *bus_space_tag_t;
typedef u_long  bus_space_handle_t;

#define PRIxBSH         "lx"

struct m68k_simple_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);
        paddr_t         (*bs_mmap)(void *, bus_addr_t addr, off_t, int, int);
        int             (*bs_peek_1)(void *, bus_space_handle_t,
                                     bus_size_t, uint8_t *);
        int             (*bs_peek_2)(void *, bus_space_handle_t,
                                     bus_size_t, uint16_t *);
        int             (*bs_peek_4)(void *, bus_space_handle_t,
                                     bus_size_t, uint32_t *);
#if 0
        int             (*bs_peek_8)(void *, bus_space_handle_t,
                                     bus_size_t, uint64_t *);
#endif
        int             (*bs_poke_1)(void *, bus_space_handle_t,
                                     bus_size_t, uint8_t);
        int             (*bs_poke_2)(void *, bus_space_handle_t,
                                     bus_size_t, uint16_t);
        int             (*bs_poke_4)(void *, bus_space_handle_t,
                                     bus_size_t, uint32_t);
#if 0
        int             (*bs_poke_8)(void *, bus_space_handle_t,
                                     bus_size_t, uint64_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))

/*
 *      paddr_t bus_space_mmap(bus_space_tag_t t,
 *                             bus_addr_t addr, off_t offset,
 *                             int prot, int flags);
 *
 * Mmap a region of bus space.
 */
#define bus_space_mmap(tag, addr, offset, prot, flags)                  \
    (*((tag)->bs_mmap))((tag)->bs_cookie, (addr), (offset), (prot), (flags))

/*
 *      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, uintN_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))

/*
 *      int bus_space_poke_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, uintN_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))

/*
 *      uintN_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.
 */
static inline uint8_t
bus_space_read_1(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
{
        (void) t;
        return *(volatile uint8_t *)((intptr_t)(h + o));
}

static inline uint16_t
bus_space_read_2(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
{
        (void) t;
        return *(volatile uint16_t *)((intptr_t)(h + o));
}

static inline uint32_t
bus_space_read_4(bus_space_tag_t t, bus_space_handle_t h, bus_size_t o)
{
        (void) t;
        return *(volatile uint32_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,
 *          uintN_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","memory");                           \
} 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","memory");                           \
} 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","memory");                           \
} while (0);

/*
 *      void bus_space_read_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          uintN_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","memory");                           \
} 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","memory");                           \
} 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","memory");                           \
} while (0);

/*
 *      void bus_space_write_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          uintN_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 {                                                            \
                (void) t;                                               \
                *((volatile uint8_t *)(intptr_t)((h) + (o))) = (v);     \
        } while (/*CONSTCOND*/0)
#define bus_space_write_2(t,h,o,v)                                      \
        do {                                                            \
                (void) t;                                               \
                *((volatile uint16_t *)(intptr_t)((h) + (o))) = (v);    \
        } while (/*CONSTCOND*/0)
#define bus_space_write_4(t,h,o,v)                                      \
        do {                                                            \
                (void) t;                                               \
                *((volatile uint32_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 uintN_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);

/*
 *      void bus_space_write_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset,
 *          const uintN_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);

/*
 *      void bus_space_set_multi_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, uintN_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);

/*
 *      void bus_space_set_region_N(bus_space_tag_t tag,
 *          bus_space_handle_t bsh, bus_size_t offset, uintN_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);

/*
 *      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 __M68K_SIMPLE_copy_region_N(BYTES)                              \
static inline void __CONCAT(bus_space_copy_region_,BYTES)               \
        (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)(                                 \
        bus_space_tag_t t,                                              \
        bus_space_handle_t h1,                                          \
        bus_size_t o1,                                                  \
        bus_space_handle_t h2,                                          \
        bus_size_t o2,                                                  \
        bus_size_t c)                                                   \
{                                                                       \
        bus_size_t o;                                                   \
        (void) t;                                                       \
                                                                        \
        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)); \
        }                                                               \
}
__M68K_SIMPLE_copy_region_N(1)
__M68K_SIMPLE_copy_region_N(2)
__M68K_SIMPLE_copy_region_N(4)

#undef __M68K_SIMPLE_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 _M68K_BUS_SPACE_PRIVATE
extern struct m68k_simple_bus_space_tag m68k_simple_bus_space;

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 paddr_t _bus_space_mmap(void *, bus_addr_t, off_t, int, int);
extern int _bus_space_peek_1(void *, bus_space_handle_t,
    bus_size_t, uint8_t *);
extern int _bus_space_peek_2(void *, bus_space_handle_t,
    bus_size_t, uint16_t *);
extern int _bus_space_peek_4(void *, bus_space_handle_t,
    bus_size_t, uint32_t *);
extern int _bus_space_poke_1(void *, bus_space_handle_t, bus_size_t, uint8_t);
extern int _bus_space_poke_2(void *, bus_space_handle_t, bus_size_t, uint16_t);
extern int _bus_space_poke_4(void *, bus_space_handle_t, bus_size_t, uint32_t);
#endif /* _M68K_BUS_SPACE_PRIVATE */

#endif /* _M68K_BUS_SPACE_SIMPLE_H_ */