/*
* Copyright (C) 2008 Stefan Hajnoczi <stefanha@gmail.com>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <ipxe/uart.h>
#include <ipxe/gdbstub.h>
#include <ipxe/gdbserial.h>
#include <config/serial.h>
/* UART port number */
#ifdef COMCONSOLE
#define GDBSERIAL_PORT COMCONSOLE
#else
#define GDBSERIAL_PORT 0
#endif
/* UART baud rate */
#ifdef COMPRESERVE
#define GDBSERIAL_BAUD 0
#else
#define GDBSERIAL_BAUD COMSPEED
#endif
/* UART line control register value */
#ifdef COMPRESERVE
#define GDBSERIAL_LCR 0
#else
#define GDBSERIAL_LCR UART_LCR_WPS ( COMDATA, COMPARITY, COMSTOP )
#endif
/** GDB serial UART */
static struct uart gdbserial_uart;
struct gdb_transport serial_gdb_transport __gdb_transport;
static size_t gdbserial_recv ( char *buf, size_t len ) {
assert ( len > 0 );
while ( ! uart_data_ready ( &gdbserial_uart ) ) {}
buf[0] = uart_receive ( &gdbserial_uart );
return 1;
}
static void gdbserial_send ( const char *buf, size_t len ) {
while ( len-- > 0 ) {
uart_transmit ( &gdbserial_uart, *buf++ );
}
}
static int gdbserial_init ( int argc, char **argv ) {
unsigned int port;
char *endp;
if ( argc == 0 ) {
port = GDBSERIAL_PORT;
} else if ( argc == 1 ) {
port = strtoul ( argv[0], &endp, 10 );
if ( *endp ) {
printf ( "serial: invalid port\n" );
return 1;
}
} else {
printf ( "serial: syntax <port>\n" );
return 1;
}
if ( ! gdbserial_configure ( port, GDBSERIAL_BAUD, GDBSERIAL_LCR ) ) {
printf ( "serial: unable to configure\n" );
return 1;
}
return 0;
}
struct gdb_transport serial_gdb_transport __gdb_transport = {
.name = "serial",
.init = gdbserial_init,
.recv = gdbserial_recv,
.send = gdbserial_send,
};
struct gdb_transport * gdbserial_configure ( unsigned int port,
unsigned int baud, uint8_t lcr ) {
int rc;
if ( ( rc = uart_select ( &gdbserial_uart, port ) ) != 0 )
return NULL;
if ( ( rc = uart_init ( &gdbserial_uart, baud, lcr ) ) != 0 )
return NULL;
return &serial_gdb_transport;
}
