119 lines
2.1 KiB
C++
119 lines
2.1 KiB
C++
/*
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* \brief Fiasco(.OC) KDB UART driver
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* \author Christian Prochaska
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* \date 2013-03-07
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*/
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/*
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* Copyright (C) 2013 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 General Public License version 2.
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*/
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#ifndef _KDB_UART_H_
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#define _KDB_UART_H_
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/* Fiasco.OC includes */
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namespace Fiasco {
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#include <l4/sys/kdebug.h>
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}
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/* Genode includes */
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#include <base/thread.h>
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#include <timer_session/connection.h>
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/* local includes */
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#include "uart_driver.h"
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using namespace Genode;
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class Kdb_uart : public Uart::Driver
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{
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private:
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signed char _buffered_char;
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Lock _kdb_read_lock;
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enum { STACK_SIZE = 2*1024*sizeof(addr_t) };
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class Char_avail_checker_thread : public Thread<STACK_SIZE>
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{
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private:
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Uart::Driver &_uart_driver;
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Uart::Char_avail_callback &_char_avail_callback;
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public:
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Char_avail_checker_thread(Uart::Driver &uart_driver,
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Uart::Char_avail_callback &char_avail_callback)
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: _uart_driver(uart_driver),
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_char_avail_callback(char_avail_callback) { }
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void entry()
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{
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Timer::Connection timer;
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for(;;) {
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if (_uart_driver.char_avail())
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_char_avail_callback();
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else
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timer.msleep(20);
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}
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}
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} _char_avail_checker_thread;
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public:
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/**
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* Constructor
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*/
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Kdb_uart(Uart::Char_avail_callback &callback)
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: _buffered_char(-1),
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_char_avail_checker_thread(*this, callback)
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{
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_char_avail_checker_thread.start();
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}
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/***************************
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** UART driver interface **
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***************************/
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void put_char(char c)
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{
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Fiasco::outchar(c);
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}
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bool char_avail()
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{
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Lock_guard<Lock> kdb_read_lock_guard(_kdb_read_lock);
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if (_buffered_char == -1)
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_buffered_char = Fiasco::l4kd_inchar();
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return (_buffered_char != -1);
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}
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char get_char()
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{
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char result;
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if (_buffered_char != -1) {
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result = _buffered_char;
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_buffered_char = -1;
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} else
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result = 0;
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return result;
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}
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void baud_rate(int bits_per_second)
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{
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}
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};
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#endif /* _KDB_UART_H_ */
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