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/* $OpenBSD: pio.h,v 1.3 2011/03/23 16:54:34 pirofti Exp $ */
/* $NetBSD: pio.h,v 1.2 2003/02/27 11:22:46 fvdl Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*/
#ifndef _MACHINE_PIO_H_
#define _MACHINE_PIO_H_
/*
* Functions to provide access to x86 programmed I/O instructions.
*
* The in[bwl]() and out[bwl]() functions are split into two varieties: one to
* use a small, constant, 8-bit port number, and another to use a large or
* variable port number. The former can be compiled as a smaller instruction.
*/
#ifdef __OPTIMIZE__
#define __use_immediate_port(port) \
(__builtin_constant_p((port)) && (port) < 0x100)
#else
#define __use_immediate_port(port) 0
#endif
#define inb(port) \
(/* CONSTCOND */ __use_immediate_port(port) ? __inbc(port) : __inb(port))
static __inline u_int8_t
__inbc(unsigned port)
{
u_int8_t data;
__asm __volatile("inb %w1,%0" : "=a" (data) : "id" (port));
return data;
}
static __inline u_int8_t
__inb(unsigned port)
{
u_int8_t data;
__asm __volatile("inb %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insb(unsigned port, void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\tinsb" :
"=D" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt) :
"memory");
}
#define inw(port) \
(/* CONSTCOND */ __use_immediate_port(port) ? __inwc(port) : __inw(port))
static __inline u_int16_t
__inwc(unsigned port)
{
u_int16_t data;
__asm __volatile("inw %w1,%0" : "=a" (data) : "id" (port));
return data;
}
static __inline u_int16_t
__inw(unsigned port)
{
u_int16_t data;
__asm __volatile("inw %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insw(unsigned port, void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\tinsw" :
"=D" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt) :
"memory");
}
#define inl(port) \
(/* CONSTCOND */ __use_immediate_port(port) ? __inlc(port) : __inl(port))
static __inline u_int32_t
__inlc(unsigned port)
{
u_int32_t data;
__asm __volatile("inl %w1,%0" : "=a" (data) : "id" (port));
return data;
}
static __inline u_int32_t
__inl(unsigned port)
{
u_int32_t data;
__asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port));
return data;
}
static __inline void
insl(unsigned port, void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\tinsl" :
"=D" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt) :
"memory");
}
#define outb(port, data) \
(/* CONSTCOND */__use_immediate_port(port) ? __outbc(port, data) : \
__outb(port, data))
static __inline void
__outbc(unsigned port, u_int8_t data)
{
__asm __volatile("outb %0,%w1" : : "a" (data), "id" (port));
}
static __inline void
__outb(unsigned port, u_int8_t data)
{
__asm __volatile("outb %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
outsb(unsigned port, const void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\toutsb" :
"=S" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt));
}
#define outw(port, data) \
(/* CONSTCOND */ __use_immediate_port(port) ? __outwc(port, data) : \
__outw(port, data))
static __inline void
__outwc(unsigned port, u_int16_t data)
{
__asm __volatile("outw %0,%w1" : : "a" (data), "id" (port));
}
static __inline void
__outw(unsigned port, u_int16_t data)
{
__asm __volatile("outw %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
outsw(unsigned port, const void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\toutsw" :
"=S" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt));
}
#define outl(port, data) \
(/* CONSTCOND */ __use_immediate_port(port) ? __outlc(port, data) : \
__outl(port, data))
static __inline void
__outlc(unsigned port, u_int32_t data)
{
__asm __volatile("outl %0,%w1" : : "a" (data), "id" (port));
}
static __inline void
__outl(unsigned port, u_int32_t data)
{
__asm __volatile("outl %0,%w1" : : "a" (data), "d" (port));
}
static __inline void
outsl(unsigned port, const void *addr, int cnt)
{
void *dummy1;
int dummy2;
__asm __volatile("cld\n\trepne\n\toutsl" :
"=S" (dummy1), "=c" (dummy2) :
"d" (port), "0" (addr), "1" (cnt));
}
#endif /* _MACHINE_PIO_H_ */
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