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/*
* This file contains the go32 console IO package.
*
* $Id$
*/
#define IBMPC_INIT
#include <stdlib.h>
#include <bsp.h>
#include <rtems/libio.h>
#include <dpmi.h>
#include <go32.h>
/* console_cleanup
*
* This routine is called at exit to clean up the console hardware.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
void console_cleanup( void )
{
/* nothing */
}
/* console_initialize
*
* This routine initializes the console IO driver.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
/* Set this if console I/O should use go32 (DOS) read/write calls. */
/* Otherwise, direct hardware accesses will be used. */
int _IBMPC_Use_Go32_IO = 0;
static rtems_isr_entry old_keyboard_isr = NULL;
extern void _IBMPC_keyboard_isr( rtems_unsigned32 interrupt );
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
if ( _IBMPC_Use_Go32_IO ) {
/* Nothing. We let DOS and go32 do all the work. */
} else {
/* Grap the keyboard interrupt so DOS doesn't steal our */
/* keystrokes. */
rtems_status_code status;
status =
rtems_interrupt_catch( _IBMPC_keyboard_isr, 9, &old_keyboard_isr );
if ( status ) {
int write( int, void *, int );
void exit( int );
char msg[] = "error initializing keyboard\n";
write( 2, msg, sizeof msg - 1 );
exit( 1 );
}
}
status = rtems_io_register_name(
"/dev/console",
major,
(rtems_device_minor_number) 0
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
atexit( console_cleanup );
return RTEMS_SUCCESSFUL;
}
/* is_character_ready
*
* This routine returns TRUE if a character is available.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
rtems_boolean is_character_ready(
char *ch
)
{
return _IBMPC_chrdy( ch ) ? TRUE : FALSE;
}
/* inbyte
*
* This routine reads a character from the UART.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
* character read from UART
*/
char inbyte( void )
{
char ch = _IBMPC_inch();
#if 1
/* Echo character to screen */
void outbyte( char ch );
outbyte( ch );
if ( ch == '\r' )
outbyte( '\n' );
#endif
return ch;
}
/* outbyte
*
* This routine transmits a character out the port.
*
* Input parameters:
* ch - character to be transmitted
*
* Output parameters: NONE
*/
void outbyte( char ch )
{
_IBMPC_outch( ch );
}
/*
* Open entry point
*/
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* Close entry point
*/
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* read bytes from the serial port. 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;
char *buffer;
int maximum;
int count = 0;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
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;
}
/*
* write bytes to the serial port. Stdout and stderr are the same.
*/
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
int count;
int maximum;
rtems_libio_rw_args_t *rw_args;
char *buffer;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
if ( buffer[ count ] == '\n') {
outbyte('\r');
}
outbyte( buffer[ count ] );
}
return maximum;
}
/*
* IO Control entry point
*/
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
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