41 lines
777 B
C++
41 lines
777 B
C++
/*
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* \brief Functions to perform port I/O
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* \author Reto Buerki
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* \date 2015-03-06
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _CORE__SPEC__X86_64__PORT_IO_H_
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#define _CORE__SPEC__X86_64__PORT_IO_H_
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#include <base/stdint.h>
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namespace Genode
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{
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/**
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* Read byte from I/O port
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*/
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inline uint8_t inb(uint16_t port)
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{
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uint8_t res;
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asm volatile ("inb %w1, %0" : "=a"(res) : "Nd"(port));
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return res;
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}
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/**
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* Write byte to I/O port
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*/
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inline void outb(uint16_t port, uint8_t val)
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{
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asm volatile ("outb %0, %w1" : : "a"(val), "Nd"(port));
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}
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}
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#endif /* _CORE__SPEC__X86_64__PORT_IO_H_ */
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