Annotation of prex-old/sys/arch/i386/pc/gdb_glue.c, Revision 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_blue.c - serial data transter routine for gdb stub
! 32: */
! 33:
! 34: #include <kernel.h>
! 35: #include <cpu.h>
! 36:
! 37: #ifdef CONFIG_GDB
! 38:
! 39: /* Serial port registers */
! 40: #define COM_PORT 0x3F8
! 41: #define RBR 0 /* 3F8 Receive buffer register. */
! 42: #define THR 0 /* 3F8 Transmit holding register. */
! 43: #define IER 1 /* 3F9 Interrupt enable register. */
! 44: #define FCR 2 /* 3FA FIFO control register. */
! 45: #define IIR 2 /* 3FA Interrupt identification register. */
! 46: #define LCR 3 /* 3FB Line control register. */
! 47: #define MCR 4 /* 3FC Modem control register. */
! 48: #define LSR 5 /* 3FD Line status register. */
! 49: #define MSR 6 /* 3FE Modem status register. */
! 50:
! 51: #define DLL 0 /* 3F8 Divisor latch LSB (LCR[7] = 1). */
! 52: #define DLM 1 /* 3F9 Divisor latch MSB (LCR[7] = 1). */
! 53:
! 54: int
! 55: serial_getchar(void)
! 56: {
! 57:
! 58: while (!(inb(COM_PORT + LSR) & 0x01));
! 59: return inb(COM_PORT + RBR);
! 60: }
! 61:
! 62: void
! 63: serial_putchar(int ch)
! 64: {
! 65:
! 66: while (!(inb(COM_PORT + LSR) & 0x20));
! 67: outb((char)ch, COM_PORT + THR);
! 68: }
! 69:
! 70: int
! 71: serial_init(void)
! 72: {
! 73:
! 74: if (inb(COM_PORT + LSR) == 0xFF)
! 75: return -1; /* Serial port is disabled */
! 76:
! 77: outb(0x00, COM_PORT + IER); /* Disable all interrupt */
! 78: outb(0x80, COM_PORT + LCR); /* Access baud rate */
! 79: outb(0x01, COM_PORT + DLL); /* Baud rate = 115200 */
! 80: outb(0x00, COM_PORT + DLM);
! 81: outb(0x03, COM_PORT + LCR); /* N, 8, 1 */
! 82: outb(0x03, COM_PORT + MCR); /* Ready */
! 83: outb(0x00, COM_PORT + FCR); /* Disable FIFO */
! 84: inb(COM_PORT);
! 85: inb(COM_PORT);
! 86: return 0;
! 87: }
! 88:
! 89: #endif /* CONFIG_GDB */
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