iodev.h

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    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_ */

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FreeBSD/Linux Kernel Cross Reference sys/arm64/include/iodev.h

FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/iodev.h