1/*-
 2 * Copyright (c) 2015 The FreeBSD Foundation
 3 *
 4 * This software was developed by Andrew Turner under
 5 * sponsorship from the FreeBSD Foundation.
 6 *
 7 * Redistribution and use in source and binary forms, with or without
 8 * modification, are permitted provided that the following conditions
 9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _MACHINE_IODEV_H_
30#define	_MACHINE_IODEV_H_
31
32#define	iodev_read_1(a)							\
33({									\
34	uint8_t val;							\
35	__asm __volatile("ldrb	%w0, [%1]" : "=&r" (val) : "r"(a));	\
36	val;								\
37})
38
39#define	iodev_read_2(a)							\
40({									\
41	uint16_t val;							\
42	__asm __volatile("ldrh	%w0, [%1]" : "=&r" (val) : "r"(a));	\
43	val;								\
44})
45
46#define	iodev_read_4(a)							\
47({									\
48	uint32_t val;							\
49	__asm __volatile("ldr	%w0, [%1]" : "=&r" (val) : "r"(a));	\
50	val;								\
51})
52
53#define	iodev_write_1(a, v)						\
54	__asm __volatile("strb	%w0, [%1]" :: "r" (v), "r"(a))
55
56#define	iodev_write_2(a, v)						\
57	__asm __volatile("strh	%w0, [%1]" :: "r" (v), "r"(a))
58
59#define	iodev_write_4(a, v)						\
60	__asm __volatile("str	%w0, [%1]" :: "r" (v), "r"(a))
61
62#endif /* _MACHINE_IODEV_H_ */