diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/force386/console/console.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/force386/console/console.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/force386/console/console.c b/c/src/lib/libbsp/i386/force386/console/console.c new file mode 100644 index 0000000000..63f6e0fb30 --- /dev/null +++ b/c/src/lib/libbsp/i386/force386/console/console.c @@ -0,0 +1,286 @@ +/* + * This file contains the Force CPU386 console IO package. + * + * 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 in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#define F386_INIT + +#include <bsp.h> +#include <rtems/libio.h> + +#include <stdlib.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 ) +{ + register rtems_unsigned8 ignored; + /* + * FORCE technical support mentioned that it may be necessary to + * read the DUSCC RX_BUFFER port four times to remove all junk. + * This code is a little more paranoid. + */ + + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); +} + +/* console_initialize + * + * This routine initializes the console IO driver. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + */ + +rtems_device_driver console_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg +) +{ + rtems_status_code status; + + /* + * flush the console now and at exit. Just in case. + */ + + console_cleanup(); + + 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 +) +{ + register rtems_unsigned8 status; + + inport_byte( RX_STATUS, status ); + + if ( Is_rx_ready( status ) ) { + inport_byte( RX_BUFFER, status ); + *ch = status; + return TRUE; + } + return 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 ) +{ + register rtems_unsigned8 status; + char ch; + + do { + inport_byte( RX_STATUS, status ); + } while ( !Is_rx_ready( status ) ); + +#if ( PORTB == 1 ) + /* + * Force example code resets the Channel B Receiver here. + * It appears to cause XON's to be lost. + */ + + /* outport_byte( RX_STATUS, 0x10 ); */ +#endif + + inport_byte( RX_BUFFER, ch ); + + return ch; +} + +/* outbyte + * + * This routine transmits a character out the port. It supports + * XON/XOFF flow control. + * + * Input parameters: + * ch - character to be transmitted + * + * Output parameters: NONE + */ + +void outbyte( + char ch +) +{ + rtems_unsigned8 status; + + do { + inport_byte( TX_STATUS, status ); + } while ( !Is_tx_ready( status ) ); + +#if 0 + while ( is_character_ready( &status ) == TRUE ) { /* must be an XOFF */ + if ( status == XOFF ) + do { + while ( is_character_ready( &status ) == FALSE ) ; + } while ( status != XON ); + } +#endif + + outport_byte( TX_BUFFER, 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') { + 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 ] ); + } + + rw_args->bytes_moved = maximum; + return 0; +} + +/* + * IO Control entry point + */ + +rtems_device_driver console_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void * arg +) +{ + return RTEMS_SUCCESSFUL; +} + |