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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* ioport.h: Convience functions to read/write directly to IO ports.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
inline Bit8u inportb(Bit16u port)
{
Bit8u ret;
asm volatile ("inb (%%dx),%%al":"=a" (ret):"d" (port));
return ret;
}
inline Bit16u inportw(Bit16u port)
{
Bit16u ret;
asm volatile ("inw (%%dx),%%ax":"=a" (ret):"d" (port));
return ret;
}
inline void outportb(Bit16u port, Bit8u value)
{
asm volatile ("outb %%al,(%%dx)"::"d" (port), "a" (value));
}
inline void outportw(Bit16u port, Bit16u value)
{
asm volatile ("outw %%ax,%%dx"::"d" (port), "a" (value));
}
/* Delayed port functions */
inline Bit8u dinportb(Bit16u port)
{
Bit8u ret;
asm volatile ("inb (%%dx),%%al;outb %%al,$0x80":"=a" (ret):"d" (port));
return ret;
}
inline Bit16u dinportw(Bit16u port)
{
Bit16u ret;
asm volatile ("inw (%%dx),%%ax;outb %%al,$0x80":"=a" (ret):"d" (port));
return ret;
}
inline void doutportb(Bit16u port, Bit8u value)
{
asm volatile ("outb %%al,(%%dx);outb %%al,$0x80"::"d" (port), "a" (value));
}
inline void doutportw(Bit16u port, Bit16u value)
{
asm volatile ("outw %%ax,%%dx;outb %%al,$0x80"::"d" (port), "a" (value));
}
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