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/*
* Copyright (c) 2010 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef X86_IO_H
#define X86_IO_H
#include <stdint.h>
/*
* Read a byte from an I/O port.
*/
static inline uint8_t
io_read_byte(uint16_t port)
{
uint8_t value;
asm volatile("inb %%dx, %%al" : "=a" (value) : "d" (port));
return value;
}
/*
* Write a byte to an I/O port.
*/
static inline void
io_write_byte(uint16_t port, uint8_t value)
{
asm volatile("outb %%al, %%dx" : : "d" (port), "a" (value));
}
#endif /* X86_IO_H */
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