mirror of
https://github.com/hermitcore/libhermit.git
synced 2025-03-09 00:00:03 +01:00
127 lines
3.9 KiB
C
127 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * 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.
|
|
* * Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 REGENTS 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.
|
|
*/
|
|
|
|
/**
|
|
* @author Stefan Lankes
|
|
* @file arch/x86/include/asm/io.h
|
|
* @brief Functions related to processor IO
|
|
*
|
|
* This file contains inline functions for processor IO operations.
|
|
*/
|
|
|
|
#ifndef __ARCH_IO_H__
|
|
#define __ARCH_IO_H__
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef CMOS_PORT_ADDRESS
|
|
#define CMOS_PORT_ADDRESS 0x70
|
|
#endif
|
|
#ifndef CMOS_PORT_DATA
|
|
#define CMOS_PORT_DATA 0x71
|
|
#endif
|
|
|
|
/** @brief Read a byte from an IO port
|
|
*
|
|
* @param _port The port you want to read from
|
|
* @return The value which reads out from this port
|
|
*/
|
|
inline static unsigned char inportb(unsigned short _port) {
|
|
unsigned char rv;
|
|
asm volatile("inb %1, %0":"=a"(rv):"dN"(_port));
|
|
return rv;
|
|
}
|
|
|
|
/** @brief Read a word (2 byte) from an IO port
|
|
*
|
|
* @param _port The port you want to read from
|
|
* @return The value which reads out from this port
|
|
*/
|
|
inline static unsigned short inportw(unsigned short _port) {
|
|
unsigned short rv;
|
|
asm volatile("inw %1, %0":"=a"(rv):"dN"(_port));
|
|
return rv;
|
|
}
|
|
|
|
/** @brief Read a double word (4 byte) from an IO port
|
|
*
|
|
* @param _port The port you want to read from
|
|
* @return The value which reads out from this port
|
|
*/
|
|
inline static unsigned int inportl(unsigned short _port) {
|
|
unsigned int rv;
|
|
asm volatile("inl %1, %0":"=a"(rv):"dN"(_port));
|
|
return rv;
|
|
}
|
|
|
|
/** @brief Write a byte to an IO port
|
|
*
|
|
* @param _port The port you want to write to
|
|
* @param _data the 1 byte value you want to write
|
|
*/
|
|
inline static void outportb(unsigned short _port, unsigned char _data) {
|
|
asm volatile("outb %1, %0"::"dN"(_port), "a"(_data));
|
|
}
|
|
|
|
/** @brief Write a word (2 bytes) to an IO port
|
|
*
|
|
* @param _port The port you want to write to
|
|
* @param _data the 2 byte value you want to write
|
|
*/
|
|
inline static void outportw(unsigned short _port, unsigned short _data) {
|
|
asm volatile("outw %1, %0"::"dN"(_port), "a"(_data));
|
|
}
|
|
|
|
/** @brief Write a double word (4 bytes) to an IO port
|
|
*
|
|
* @param _port The port you want to write to
|
|
* @param _data the 4 byte value you want to write
|
|
*/
|
|
inline static void outportl(unsigned short _port, unsigned int _data)
|
|
{
|
|
asm volatile("outl %1, %0"::"dN"(_port), "a"(_data));
|
|
}
|
|
|
|
/**
|
|
* write a byte in CMOS
|
|
* @param offset CMOS offset
|
|
* @param val the value you want wto write
|
|
*/
|
|
inline static void cmos_write(uint8_t offset, uint8_t val)
|
|
{
|
|
outportb(CMOS_PORT_ADDRESS, offset);
|
|
outportb(CMOS_PORT_DATA, val);
|
|
}
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|