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/*
* This file contains the go32 console IO package.
*
* $Id$
*/
#define IBMPC_INIT
#include <stdlib.h>
#include <rtems.h>
#include "console.h"
#include "bsp.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_id self,
rtems_unsigned32 *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 );
}
}
atexit( console_cleanup );
}
/* 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 );
}
/*
* __read -- read bytes from the console. Ignore fd, since
* we only have stdin.
*/
int __read(
int fd,
char *buf,
int nbytes
)
{
int i = 0;
for ( i = 0; i < nbytes; i++ ) {
buf[i] = inbyte();
if ( buf[i] == '\r' ) {
/* What if this goes past the end of the buffer? We're hosed. [bhc] */
buf[i++] = '\n';
buf[i] = '\0';
break;
}
}
return i;
}
/*
* __write -- write bytes to the console. Ignore fd, since
* stdout and stderr are the same. Since we have no filesystem,
* open will only return an error.
*/
int __write(
int fd,
char *buf,
int nbytes
)
{
int i;
for (i = 0; i < nbytes; i++) {
if (*(buf + i) == '\n') {
outbyte ('\r');
}
outbyte (*(buf + i));
}
return (nbytes);
}
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