xref: /freebsd/sys/arm64/include/iodev.h (revision 0d66206fff44f864ea8a4b220c3a53b4caa959a0)
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  * $FreeBSD$
29  */
30 
31 #ifndef _MACHINE_IODEV_H_
32 #define	_MACHINE_IODEV_H_
33 
34 #define	iodev_read_1(a)							\
35 ({									\
36 	uint8_t val;							\
37 	__asm __volatile("ldrb	%w0, [%1]" : "=&r" (val) : "r"(a));	\
38 	val;								\
39 })
40 
41 #define	iodev_read_2(a)							\
42 ({									\
43 	uint16_t val;							\
44 	__asm __volatile("ldrh	%w0, [%1]" : "=&r" (val) : "r"(a));	\
45 	val;								\
46 })
47 
48 #define	iodev_read_4(a)							\
49 ({									\
50 	uint32_t val;							\
51 	__asm __volatile("ldr	%w0, [%1]" : "=&r" (val) : "r"(a));	\
52 	val;								\
53 })
54 
55 #define	iodev_write_1(a, v)						\
56 	__asm __volatile("strb	%w0, [%1]" :: "r" (v), "r"(a))
57 
58 #define	iodev_write_2(a, v)						\
59 	__asm __volatile("strh	%w0, [%1]" :: "r" (v), "r"(a))
60 
61 #define	iodev_write_4(a, v)						\
62 	__asm __volatile("str	%w0, [%1]" :: "r" (v), "r"(a))
63 
64 #endif /* _MACHINE_IODEV_H_ */
65