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Annotation of prex/sys/arch/i386/pc/gdb_glue.c, Revision 1.1.1.1

1.1       nbrk        1: /*-
                      2:  * Copyright (c) 2005, Kohsuke Ohtani
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. Neither the name of the author nor the names of any co-contributors
                     14:  *    may be used to endorse or promote products derived from this software
                     15:  *    without specific prior written permission.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  */
                     29:
                     30: /*
                     31:  * gdb_glue.c - serial data transfer routine for gdb stub
                     32:  */
                     33:
                     34: #include <kernel.h>
                     35: #include <cpu.h>
                     36:
                     37: /* Serial port registers */
                     38: #define COM_PORT  0x3F8
                     39: #define RBR    0               /* 3F8 Receive buffer register. */
                     40: #define THR    0               /* 3F8 Transmit holding register. */
                     41: #define IER    1               /* 3F9 Interrupt enable register. */
                     42: #define FCR    2               /* 3FA FIFO control register. */
                     43: #define IIR    2               /* 3FA Interrupt identification register. */
                     44: #define LCR    3               /* 3FB Line control register. */
                     45: #define MCR    4               /* 3FC Modem control register. */
                     46: #define LSR    5               /* 3FD Line status register. */
                     47: #define MSR    6               /* 3FE Modem status register. */
                     48:
                     49: #define DLL    0               /* 3F8 Divisor latch LSB (LCR[7] = 1). */
                     50: #define DLM    1               /* 3F9 Divisor latch MSB (LCR[7] = 1). */
                     51:
                     52: int
                     53: serial_getchar(void)
                     54: {
                     55:
                     56:        while (!(inb(COM_PORT + LSR) & 0x01));
                     57:        return inb(COM_PORT + RBR);
                     58: }
                     59:
                     60: void
                     61: serial_putchar(int ch)
                     62: {
                     63:
                     64:        while (!(inb(COM_PORT + LSR) & 0x20));
                     65:        outb((char)ch, COM_PORT + THR);
                     66: }
                     67:
                     68: int
                     69: serial_init(void)
                     70: {
                     71:
                     72:        if (inb(COM_PORT + LSR) == 0xFF)
                     73:                return -1;      /* Serial port is disabled */
                     74:
                     75:        outb(0x00, COM_PORT + IER);     /* Disable all interrupt */
                     76:        outb(0x80, COM_PORT + LCR);     /* Access baud rate */
                     77:        outb(0x01, COM_PORT + DLL);     /* Baud rate = 115200 */
                     78:        outb(0x00, COM_PORT + DLM);
                     79:        outb(0x03, COM_PORT + LCR);     /* N, 8, 1 */
                     80:        outb(0x03, COM_PORT + MCR);     /* Ready */
                     81:        outb(0x00, COM_PORT + FCR);     /* Disable FIFO */
                     82:        inb(COM_PORT);
                     83:        inb(COM_PORT);
                     84:        return 0;
                     85: }