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base: move x86 uart driver from nova to base

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So it can be reused by base-hw-x86 instead of re-writing it.

Fixes #1403
This commit is contained in:
Alexander Boettcher
2015-07-09 11:03:11 +02:00
committed by Norman Feske
parent bc827787f4
commit 0b019d0508
3 changed files with 166 additions and 253 deletions
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136
repos/base-hw/src/core/include/spec/x86/serial.h
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@ -5,142 +5,30 @@
*/
/*
* Copyright (C) 2012-2013 Genode Labs GmbH
* Copyright (C) 2012-2015 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _SERIAL_H_
#define _SERIAL_H_
#pragma once
/* Genode includes */
#include <base/stdint.h>
#include <drivers/uart/x86_uart_base.h>
namespace Genode { class Serial; }
/**
* Read byte from I/O port
* Serial output driver for core
*/
inline Genode::uint8_t inb(Genode::uint16_t port)
class Genode::Serial : public X86_uart_base
{
Genode::uint8_t res;
asm volatile ("inb %%dx, %0" :"=a"(res) :"Nd"(port));
return res;
}
private:
enum { IO_PORT = 0x3f8, CLOCK_UNUSED = 0 };
/**
* Write byte to I/O port
*/
inline void outb(Genode::uint16_t port, Genode::uint8_t val)
{
asm volatile ("outb %b0, %w1" : : "a" (val), "Nd" (port));
}
public:
/**
* Definitions of PC serial ports
*/
enum {
COMPORT_DATA_OFFSET = 0,
COMPORT_STATUS_OFFSET = 5,
STATUS_THR_EMPTY = 0x20, /* transmitter hold register empty */
STATUS_DHR_EMPTY = 0x40, /* data hold register empty
- data completely sent */
Serial(unsigned baud_rate)
: X86_uart_base(IO_PORT, CLOCK_UNUSED, baud_rate) { }
};
/**
* Initialize serial port
*
* Based on 'init_serial' of L4ka::Pistachio's 'kdb/platform/pc99/io.cc'
*/
static void init_comport(Genode::uint16_t port, unsigned baud)
{
if (!port)
return;
unsigned const ier = port + 1;
unsigned const eir = port + 2;
unsigned const lcr = port + 3;
unsigned const mcr = port + 4;
unsigned const lsr = port + 5;
unsigned const msr = port + 6;
unsigned const dllo = port + 0;
unsigned const dlhi = port + 1;
outb(lcr, 0x80); /* select bank 1 */
outb(dllo, (115200/baud) >> 0);
outb(dlhi, (115200/baud) >> 8);
outb(lcr, 0x03); /* set 8,n,1 */
outb(ier, 0x00); /* disable interrupts */
outb(eir, 0x07); /* enable FIFOs */
outb(mcr, 0x0b); /* force data terminal ready */
outb(ier, 0x01); /* enable rx interrupts */
inb(ier);
inb(eir);
inb(lcr);
inb(mcr);
inb(lsr);
inb(msr);
}
/**
* Output character to serial port
*/
inline void serial_out_char(Genode::uint16_t comport, Genode::uint8_t c)
{
/* wait until serial port is ready */
Genode::uint8_t ready = STATUS_THR_EMPTY;
while ((inb(comport + COMPORT_STATUS_OFFSET) & ready) != ready);
/* output character */
outb(comport + COMPORT_DATA_OFFSET, c);
}
namespace Genode {
/**
* Serial output driver for core
*/
class Serial
{
private:
uint16_t _comport;
public:
void put_char(char c)
{
if (!_comport)
return;
if (c == '\n')
serial_out_char(_comport, '\r');
serial_out_char(_comport, c);
}
/**
* Constructor
*
* XXX: The 'baud_rate' argument is ignored for now.
*/
Serial(unsigned) : _comport(0x3f8)
{
init_comport(_comport, 115200);
}
Serial(const char *s) : _comport(0x3f8)
{
init_comport(_comport, 115200);
while (*s)
put_char(*s++);
}
};
}
#endif /* _SERIAL_H_ */