Colony » Colony Scout » Colony Scout OS

/*-

 * Copyright (c) 2005-2009, Kohsuke Ohtani

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. Neither the name of the author nor the names of any co-contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 */

#include <sys/param.h>

#include <boot.h>

extern void        outb(int, u_char);

extern u_char        inb(int);

#define SCREEN_80x25 1

/* #define SCREEN_80x50 1 */

#define COM_BASE        CONFIG_NS16550_BASE

/* Register offsets */

#define COM_RBR                (COM_BASE + 0x00)        /* receive buffer register */

#define COM_THR                (COM_BASE + 0x00)        /* transmit holding register */

#define COM_IER                (COM_BASE + 0x01)        /* interrupt enable register */

#define COM_FCR                (COM_BASE + 0x02)        /* FIFO control register */

#define COM_IIR                (COM_BASE + 0x02)        /* interrupt identification register */

#define COM_LCR                (COM_BASE + 0x03)        /* line control register */

#define COM_MCR                (COM_BASE + 0x04)        /* modem control register */

#define COM_LSR                (COM_BASE + 0x05)        /* line status register */

#define COM_MSR                (COM_BASE + 0x06)        /* modem status register */

#define COM_DLL                (COM_BASE + 0x00)        /* divisor latch LSB (LCR[7] = 1) */

#define COM_DLM                (COM_BASE + 0x01)        /* divisor latch MSB (LCR[7] = 1) */

/*

 * Print one chracter

 */

void

debug_putc(int c)

{

#if defined(DEBUG) && defined(CONFIG_DIAG_SERIAL)

        /*

         * output to serial port.

         */

        while (!(inb(COM_LSR) & 0x20))

                ;

        outb(COM_THR, c);

#endif

#if defined(DEBUG) && defined(CONFIG_DIAG_BOCHS)

        /*

         * output to bochs emulater console.

         */

        if (inb(0xe9) == 0xe9)

                outb(0xe9, (u_char)c);

#endif

}

/*

 * Initialize debug port.

 */

void

debug_init(void)

{

#if defined(DEBUG) && defined(CONFIG_DIAG_SERIAL)

        /*

         * Initialize serial port.

         */

        if (inb(COM_LSR) == 0xff)

                return;                /* Serial port is disabled */

        outb(COM_IER, 0x00);        /* Disable interrupt */

        outb(COM_LCR, 0x80);        /* Access baud rate */

        outb(COM_DLL, 0x01);        /* 115200 baud */

        outb(COM_DLM, 0x00);

        outb(COM_LCR, 0x03);        /* N, 8, 1 */

        outb(COM_MCR, 0x03);        /* Ready */

        outb(COM_FCR, 0x00);        /* Disable FIFO */

        inb(COM_RBR);

        inb(COM_RBR);

#endif

}