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|
/*-------------------------------------------------------------------------+
| console.c v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| This file contains the PC386 console I/O package.
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on:
| console.c,v 1.4 1995/12/19 20:07:23 joel Exp - go32 BSP
| With the following copyright notice:
| **************************************************************************
| * COPYRIGHT (c) 1989-1997.
| * On-Line Applications Research Corporation (OAR).
| * Copyright assigned to U.S. Government, 1994.
| *
| * The license and distribution terms for this file may be
| * found in found in the file LICENSE in this distribution or at
| * http://www.OARcorp.com/rtems/license.html.
| **************************************************************************
|
| $Id$
+--------------------------------------------------------------------------*/
#include <stdlib.h>
#include <bsp.h>
#include <irq.h>
#include <rtems/libio.h>
/*-------------------------------------------------------------------------+
| Constants
+--------------------------------------------------------------------------*/
#define KEYBOARD_IRQ 0x01 /* Keyboard IRQ. */
/*-------------------------------------------------------------------------+
| External Prototypes
+--------------------------------------------------------------------------*/
extern rtems_isr _IBMPC_keyboard_isr(rtems_vector_number);
/* keyboard (IRQ 0x01) Interrupt Service Routine (defined in 'inch.c') */
/*-------------------------------------------------------------------------+
| Functions
+--------------------------------------------------------------------------*/
/*-------------------------------------------------------------------------+
| Function: console_cleanup
| Description: This routine is called at exit to clean up the console
| hardware.
| Global Variables: None.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
console_cleanup(void)
{
/* nothing */
} /* console_cleanup */
/*-------------------------------------------------------------------------+
| Function: is_character_ready
| Description: Check if a character is available for input, and if so
| return it.
| Global Variables: None.
| Arguments: c - character read if available, otherwise unchanged.
| Returns: TRUE if there was a character available for input,
| FALSE otherwise.
+--------------------------------------------------------------------------*/
rtems_boolean
is_character_ready(char *c)
{
return (_IBMPC_chrdy(c) ? TRUE : FALSE);
} /* is_character_ready */
/*-------------------------------------------------------------------------+
| Function: inbyte
| Description: Read a character from the console (keyboard).
| Global Variables: None.
| Arguments: None.
| Returns: Caracter read from the console.
+--------------------------------------------------------------------------*/
unsigned char
inbyte(void)
{
char c = _IBMPC_inch();
/* Echo character to screen */
_IBMPC_outch(c);
if (c == '\r')
_IBMPC_outch('\n'); /* CR = CR + LF */
return c;
} /* inbyte */
/*-------------------------------------------------------------------------+
| Function: outbyte
| Description: Write a character to the console (display).
| Global Variables: None.
| Arguments: Character to be written.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
outbyte(char c)
{
_IBMPC_outch(c);
} /* outbyte */
/*-------------------------------------------------------------------------+
| Console device driver INITIALIZE entry point.
+--------------------------------------------------------------------------+
| Initilizes the I/O console (keyboard + VGA display) driver.
+--------------------------------------------------------------------------*/
rtems_device_driver
console_initialize(rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
rtems_status_code status;
/* Initialize video */
_IBMPC_initVideo();
/* Install keyboard interrupt handler */
status = PC386_installRtemsIrqHandler(KEYBOARD_IRQ, _IBMPC_keyboard_isr);
if (status != RTEMS_SUCCESSFUL)
{
printk("Error installing keyboard interrupt handler!\n");
rtems_fatal_error_occurred(status);
}
status =
rtems_io_register_name("/dev/console", major, (rtems_device_minor_number)0);
if (status != RTEMS_SUCCESSFUL)
{
printk("Error registering console device!\n");
rtems_fatal_error_occurred(status);
}
atexit(console_cleanup);
return RTEMS_SUCCESSFUL;
} /* console_initialize */
/*-------------------------------------------------------------------------+
| Console device driver OPEN entry point
+--------------------------------------------------------------------------*/
rtems_device_driver
console_open(rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
return RTEMS_SUCCESSFUL;
} /* console_open */
/*-------------------------------------------------------------------------+
| Console device driver CLOSE entry point
+--------------------------------------------------------------------------*/
rtems_device_driver
console_close(rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
return RTEMS_SUCCESSFUL;
} /* console_close */
/*-------------------------------------------------------------------------+
| Console device driver READ entry point.
+--------------------------------------------------------------------------+
| Read characters from the I/O console. We only have stdin.
+--------------------------------------------------------------------------*/
rtems_device_driver
console_read(rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
char *buffer = rw_args->buffer;
int count, maximum = rw_args->count;
for (count = 0; count < maximum; count++)
{
buffer[count] = inbyte();
if (buffer[count] == '\n' || buffer[count] == '\r')
{
/* What if this goes past the end of the buffer? We're hosed. [bhc] */
buffer[count++] = '\n';
buffer[count] = '\0';
break;
}
}
rw_args->bytes_moved = count;
return ((count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED);
} /* console_read */
/*-------------------------------------------------------------------------+
| Console device driver WRITE entry point.
+--------------------------------------------------------------------------+
| Write characters to the I/O console. Stderr and stdout are the same.
+--------------------------------------------------------------------------*/
rtems_device_driver
console_write(rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
char *buffer = rw_args->buffer;
int count, maximum = rw_args->count;
for (count = 0; count < maximum; count++)
{
outbyte(buffer[count]);
if (buffer[count] == '\n')
outbyte('\r'); /* LF = LF + CR */
}
rw_args->bytes_moved = maximum;
return RTEMS_SUCCESSFUL;
} /* console_write */
/*-------------------------------------------------------------------------+
| Console device driver CONTROL entry point
+--------------------------------------------------------------------------*/
rtems_device_driver
console_control(rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
return RTEMS_SUCCESSFUL;
} /* console_control */
|
