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unneback |
/*
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* TERMIOS serial line support
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*
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* Author:
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* W. Eric Norum
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* Saskatchewan Accelerator Laboratory
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* University of Saskatchewan
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* Saskatoon, Saskatchewan, CANADA
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* eric@skatter.usask.ca
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id: termios.c,v 1.2 2001-09-27 12:01:15 chris Exp $
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*/
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#include <rtems.h>
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#include <rtems/libio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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/*
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* FreeBSD does not support a full POSIX termios so we have to help it out
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*/
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#if defined(__FreeBSD__)
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#define XTABS 0
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#define ONLRET 0
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#define ONOCR 0
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#define TABDLY 0
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#define OLCUC 0
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#define ILCUC 0
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#define OCRNL 0
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#define IUCLC 0
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#endif
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/*
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* Cygwin does not define these
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*/
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#if defined(__CYGWIN__)
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#define ECHOPRT 0
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#endif
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/*
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* The size of the cooked buffer
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*/
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#define CBUFSIZE 256
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/*
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* The sizes of the raw message buffers.
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* On most architectures it is quite a bit more
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* efficient if these are powers of two.
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*/
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#define RAW_INPUT_BUFFER_SIZE 128
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#define RAW_OUTPUT_BUFFER_SIZE 64
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/*
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* Variables associated with each termios instance.
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* One structure for each hardware I/O device.
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*/
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struct rtems_termios_tty {
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/*
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* Linked-list of active TERMIOS devices
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*/
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struct rtems_termios_tty *forw;
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struct rtems_termios_tty *back;
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/*
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* How many times has this device been opened
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*/
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int refcount;
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/*
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* This device
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*/
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rtems_device_major_number major;
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rtems_device_major_number minor;
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/*
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* Mutual-exclusion semaphores
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*/
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rtems_id isem;
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rtems_id osem;
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/*
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* The canonical (cooked) character buffer
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*/
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char cbuf[CBUFSIZE];
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int ccount;
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int cindex;
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/*
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* Keep track of cursor (printhead) position
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*/
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int column;
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int read_start_column;
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/*
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* The ioctl settings
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*/
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struct termios termios;
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rtems_interval vtimeTicks;
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/*
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* Raw input character buffer
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*/
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volatile char rawInBuf[RAW_INPUT_BUFFER_SIZE];
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volatile unsigned int rawInBufHead;
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volatile unsigned int rawInBufTail;
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rtems_id rawInBufSemaphore;
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rtems_unsigned32 rawInBufSemaphoreOptions;
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rtems_interval rawInBufSemaphoreTimeout;
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rtems_interval rawInBufSemaphoreFirstTimeout;
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unsigned int rawInBufDropped; /* Statistics */
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/*
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* Raw output character buffer
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*/
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volatile char rawOutBuf[RAW_OUTPUT_BUFFER_SIZE];
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volatile unsigned int rawOutBufHead;
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volatile unsigned int rawOutBufTail;
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rtems_id rawOutBufSemaphore;
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enum {rob_idle, rob_busy, rob_wait } rawOutBufState;
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/*
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* Callbacks to device-specific routines
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*/
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rtems_termios_callbacks device;
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volatile unsigned int flow_ctrl;
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unsigned int lowwater,highwater;
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};
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/* fields for "flow_ctrl" status */
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#define FL_IREQXOF 1 /* input queue requests stop of incoming data */
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#define FL_ISNTXOF 2 /* XOFF has been sent to other side of line */
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#define FL_IRTSOFF 4 /* RTS has been turned off for other side.. */
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#define FL_ORCVXOF 0x10 /* XOFF has been received */
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#define FL_OSTOP 0x20 /* output has been stopped due to XOFF */
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#define FL_MDRTS 0x100 /* input controlled with RTS/CTS handshake */
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#define FL_MDXON 0x200 /* input controlled with XON/XOFF protocol */
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#define FL_MDXOF 0x400 /* output controlled with XON/XOFF protocol */
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extern struct rtems_termios_tty *rtems_termios_ttyHead;
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extern struct rtems_termios_tty *rtems_termios_ttyTail;
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extern rtems_id rtems_termios_ttyMutex;
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/*
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* Open a termios device
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*/
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rtems_status_code
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rtems_termios_open (
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg,
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const rtems_termios_callbacks *callbacks
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)
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{
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rtems_status_code sc;
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rtems_libio_open_close_args_t *args = arg;
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struct rtems_termios_tty *tty;
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/*
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* See if the device has already been opened
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*/
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sc = rtems_semaphore_obtain (rtems_termios_ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
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if (sc != RTEMS_SUCCESSFUL)
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return sc;
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for (tty = rtems_termios_ttyHead ; tty != NULL ; tty = tty->forw) {
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if ((tty->major == major) && (tty->minor == minor))
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break;
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}
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if (tty == NULL) {
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static char c = 'a';
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/*
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* Create a new device
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*/
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tty = calloc (1, sizeof (struct rtems_termios_tty));
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if (tty == NULL) {
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rtems_semaphore_release (rtems_termios_ttyMutex);
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return RTEMS_NO_MEMORY;
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| 190 |
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}
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if (rtems_termios_ttyHead)
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rtems_termios_ttyHead->back = tty;
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tty->forw = rtems_termios_ttyHead;
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rtems_termios_ttyHead = tty;
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if (rtems_termios_ttyTail == NULL)
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rtems_termios_ttyTail = tty;
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tty->minor = minor;
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tty->major = major;
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/*
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* Set up mutex semaphores
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*/
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sc = rtems_semaphore_create (
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rtems_build_name ('T', 'R', 'i', c),
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1,
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RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY,
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RTEMS_NO_PRIORITY,
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&tty->isem);
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if (sc != RTEMS_SUCCESSFUL)
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| 210 |
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rtems_fatal_error_occurred (sc);
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| 211 |
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sc = rtems_semaphore_create (
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| 212 |
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rtems_build_name ('T', 'R', 'o', c),
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1,
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| 214 |
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RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY,
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RTEMS_NO_PRIORITY,
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&tty->osem);
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if (sc != RTEMS_SUCCESSFUL)
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| 218 |
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rtems_fatal_error_occurred (sc);
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| 219 |
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sc = rtems_semaphore_create (
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| 220 |
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rtems_build_name ('T', 'R', 'x', c),
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0,
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| 222 |
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RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY,
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| 223 |
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RTEMS_NO_PRIORITY,
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| 224 |
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&tty->rawOutBufSemaphore);
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| 225 |
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if (sc != RTEMS_SUCCESSFUL)
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| 226 |
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rtems_fatal_error_occurred (sc);
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tty->rawOutBufState = rob_idle;
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| 229 |
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/*
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* Set callbacks
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| 231 |
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*/
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| 232 |
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tty->device = *callbacks;
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| 233 |
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if (!tty->device.pollRead) {
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| 234 |
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sc = rtems_semaphore_create (
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| 235 |
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rtems_build_name ('T', 'R', 'r', c),
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0,
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RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY,
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RTEMS_NO_PRIORITY,
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&tty->rawInBufSemaphore);
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| 240 |
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if (sc != RTEMS_SUCCESSFUL)
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| 241 |
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rtems_fatal_error_occurred (sc);
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| 242 |
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}
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| 243 |
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| 244 |
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/*
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| 245 |
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* Set default parameters
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| 246 |
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*/
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| 247 |
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tty->termios.c_iflag = BRKINT | ICRNL | IMAXBEL;
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| 248 |
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tty->termios.c_oflag = OPOST | ONLCR | XTABS;
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| 249 |
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tty->termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL;
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| 250 |
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tty->termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOK | ECHOE | ECHOCTL;
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| 251 |
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| 252 |
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tty->termios.c_cc[VINTR] = '\003';
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| 253 |
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tty->termios.c_cc[VQUIT] = '\034';
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| 254 |
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tty->termios.c_cc[VERASE] = '\177';
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| 255 |
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tty->termios.c_cc[VKILL] = '\025';
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| 256 |
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tty->termios.c_cc[VEOF] = '\004';
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| 257 |
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tty->termios.c_cc[VEOL] = '\000';
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| 258 |
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tty->termios.c_cc[VEOL2] = '\000';
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| 259 |
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tty->termios.c_cc[VSTART] = '\021';
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| 260 |
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tty->termios.c_cc[VSTOP] = '\023';
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| 261 |
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tty->termios.c_cc[VSUSP] = '\032';
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| 262 |
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tty->termios.c_cc[VREPRINT] = '\022';
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| 263 |
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tty->termios.c_cc[VDISCARD] = '\017';
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| 264 |
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tty->termios.c_cc[VWERASE] = '\027';
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| 265 |
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tty->termios.c_cc[VLNEXT] = '\026';
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| 266 |
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| 267 |
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/* start with no flow control, clear flow control flags */
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| 268 |
|
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tty->flow_ctrl = 0;
|
| 269 |
|
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/*
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| 270 |
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* set low/highwater mark for XON/XOFF support
|
| 271 |
|
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*/
|
| 272 |
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tty->lowwater = RAW_INPUT_BUFFER_SIZE * 1/2;
|
| 273 |
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tty->highwater = RAW_INPUT_BUFFER_SIZE * 3/4;
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| 274 |
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/*
|
| 275 |
|
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* Bump name characer
|
| 276 |
|
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*/
|
| 277 |
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if (c++ == 'z')
|
| 278 |
|
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c = 'a';
|
| 279 |
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|
| 280 |
|
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}
|
| 281 |
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args->iop->data1 = tty;
|
| 282 |
|
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if (!tty->refcount++ && tty->device.firstOpen)
|
| 283 |
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(*tty->device.firstOpen)(major, minor, arg);
|
| 284 |
|
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rtems_semaphore_release (rtems_termios_ttyMutex);
|
| 285 |
|
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return RTEMS_SUCCESSFUL;
|
| 286 |
|
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}
|
| 287 |
|
|
|
| 288 |
|
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/*
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| 289 |
|
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* Drain output queue
|
| 290 |
|
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*/
|
| 291 |
|
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static void
|
| 292 |
|
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drainOutput (struct rtems_termios_tty *tty)
|
| 293 |
|
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{
|
| 294 |
|
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rtems_interrupt_level level;
|
| 295 |
|
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rtems_status_code sc;
|
| 296 |
|
|
|
| 297 |
|
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if (tty->device.outputUsesInterrupts) {
|
| 298 |
|
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rtems_interrupt_disable (level);
|
| 299 |
|
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while (tty->rawOutBufTail != tty->rawOutBufHead) {
|
| 300 |
|
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tty->rawOutBufState = rob_wait;
|
| 301 |
|
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rtems_interrupt_enable (level);
|
| 302 |
|
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sc = rtems_semaphore_obtain (tty->rawOutBufSemaphore,
|
| 303 |
|
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RTEMS_WAIT,
|
| 304 |
|
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RTEMS_NO_TIMEOUT);
|
| 305 |
|
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if (sc != RTEMS_SUCCESSFUL)
|
| 306 |
|
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rtems_fatal_error_occurred (sc);
|
| 307 |
|
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rtems_interrupt_disable (level);
|
| 308 |
|
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}
|
| 309 |
|
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rtems_interrupt_enable (level);
|
| 310 |
|
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}
|
| 311 |
|
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}
|
| 312 |
|
|
|
| 313 |
|
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rtems_status_code
|
| 314 |
|
|
rtems_termios_close (void *arg)
|
| 315 |
|
|
{
|
| 316 |
|
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rtems_libio_open_close_args_t *args = arg;
|
| 317 |
|
|
struct rtems_termios_tty *tty = args->iop->data1;
|
| 318 |
|
|
rtems_status_code sc;
|
| 319 |
|
|
|
| 320 |
|
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sc = rtems_semaphore_obtain (rtems_termios_ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 321 |
|
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if (sc != RTEMS_SUCCESSFUL)
|
| 322 |
|
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rtems_fatal_error_occurred (sc);
|
| 323 |
|
|
if (--tty->refcount == 0) {
|
| 324 |
|
|
drainOutput (tty);
|
| 325 |
|
|
if (tty->device.lastClose)
|
| 326 |
|
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(*tty->device.lastClose)(tty->major, tty->minor, arg);
|
| 327 |
|
|
if (tty->forw == NULL)
|
| 328 |
|
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rtems_termios_ttyTail = tty->back;
|
| 329 |
|
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else
|
| 330 |
|
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tty->forw->back = tty->back;
|
| 331 |
|
|
if (tty->back == NULL)
|
| 332 |
|
|
rtems_termios_ttyHead = tty->forw;
|
| 333 |
|
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else
|
| 334 |
|
|
tty->back->forw = tty->forw;
|
| 335 |
|
|
rtems_semaphore_delete (tty->isem);
|
| 336 |
|
|
rtems_semaphore_delete (tty->osem);
|
| 337 |
|
|
rtems_semaphore_delete (tty->rawOutBufSemaphore);
|
| 338 |
|
|
if (!tty->device.pollRead)
|
| 339 |
|
|
rtems_semaphore_delete (tty->rawInBufSemaphore);
|
| 340 |
|
|
free (tty);
|
| 341 |
|
|
}
|
| 342 |
|
|
rtems_semaphore_release (rtems_termios_ttyMutex);
|
| 343 |
|
|
return RTEMS_SUCCESSFUL;
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
static void
|
| 347 |
|
|
termios_set_flowctrl(struct rtems_termios_tty *tty)
|
| 348 |
|
|
{
|
| 349 |
|
|
rtems_interrupt_level level;
|
| 350 |
|
|
/*
|
| 351 |
|
|
* check for flow control options to be switched off
|
| 352 |
|
|
*/
|
| 353 |
|
|
|
| 354 |
|
|
/* check for outgoing XON/XOFF flow control switched off */
|
| 355 |
|
|
if (( tty->flow_ctrl & FL_MDXON) &&
|
| 356 |
|
|
!(tty->termios.c_iflag & IXON)) {
|
| 357 |
|
|
/* clear related flags in flow_ctrl */
|
| 358 |
|
|
tty->flow_ctrl &= ~(FL_MDXON | FL_ORCVXOF);
|
| 359 |
|
|
|
| 360 |
|
|
/* has output been stopped due to received XOFF? */
|
| 361 |
|
|
if (tty->flow_ctrl & FL_OSTOP) {
|
| 362 |
|
|
/* disable interrupts */
|
| 363 |
|
|
rtems_interrupt_disable(level);
|
| 364 |
|
|
tty->flow_ctrl &= ~FL_OSTOP;
|
| 365 |
|
|
/* check for chars in output buffer (or rob_state?) */
|
| 366 |
|
|
if (tty->rawOutBufState != rob_idle) {
|
| 367 |
|
|
/* if chars available, call write function... */
|
| 368 |
|
|
(*tty->device.write)(tty->minor,
|
| 369 |
|
|
(char *)&tty->rawOutBuf[tty->rawOutBufTail], 1);
|
| 370 |
|
|
}
|
| 371 |
|
|
/* reenable interrupts */
|
| 372 |
|
|
rtems_interrupt_enable(level);
|
| 373 |
|
|
}
|
| 374 |
|
|
}
|
| 375 |
|
|
/* check for incoming XON/XOFF flow control switched off */
|
| 376 |
|
|
if (( tty->flow_ctrl & FL_MDXOF) &&
|
| 377 |
|
|
!(tty->termios.c_iflag & IXOFF)) {
|
| 378 |
|
|
/* clear related flags in flow_ctrl */
|
| 379 |
|
|
tty->flow_ctrl &= ~(FL_MDXOF);
|
| 380 |
|
|
/* FIXME: what happens, if we had sent XOFF but not yet XON? */
|
| 381 |
|
|
tty->flow_ctrl &= ~(FL_ISNTXOF);
|
| 382 |
|
|
}
|
| 383 |
|
|
|
| 384 |
|
|
/* check for incoming RTS/CTS flow control switched off */
|
| 385 |
|
|
if (( tty->flow_ctrl & FL_MDRTS) &&
|
| 386 |
|
|
!(tty->termios.c_cflag & CRTSCTS)) {
|
| 387 |
|
|
/* clear related flags in flow_ctrl */
|
| 388 |
|
|
tty->flow_ctrl &= ~(FL_MDRTS);
|
| 389 |
|
|
|
| 390 |
|
|
/* restart remote Tx, if it was stopped */
|
| 391 |
|
|
if ((tty->flow_ctrl & FL_IRTSOFF) &&
|
| 392 |
|
|
(tty->device.startRemoteTx != NULL)) {
|
| 393 |
|
|
tty->device.startRemoteTx(tty->minor);
|
| 394 |
|
|
}
|
| 395 |
|
|
tty->flow_ctrl &= ~(FL_IRTSOFF);
|
| 396 |
|
|
}
|
| 397 |
|
|
|
| 398 |
|
|
/*
|
| 399 |
|
|
* check for flow control options to be switched on
|
| 400 |
|
|
*/
|
| 401 |
|
|
/* check for incoming RTS/CTS flow control switched on */
|
| 402 |
|
|
if (tty->termios.c_cflag & CRTSCTS) {
|
| 403 |
|
|
tty->flow_ctrl |= FL_MDRTS;
|
| 404 |
|
|
}
|
| 405 |
|
|
/* check for incoming XON/XOF flow control switched on */
|
| 406 |
|
|
if (tty->termios.c_iflag & IXOFF) {
|
| 407 |
|
|
tty->flow_ctrl |= FL_MDXOF;
|
| 408 |
|
|
}
|
| 409 |
|
|
/* check for outgoing XON/XOF flow control switched on */
|
| 410 |
|
|
if (tty->termios.c_iflag & IXON) {
|
| 411 |
|
|
tty->flow_ctrl |= FL_MDXON;
|
| 412 |
|
|
}
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
|
|
rtems_status_code
|
| 416 |
|
|
rtems_termios_ioctl (void *arg)
|
| 417 |
|
|
{
|
| 418 |
|
|
rtems_libio_ioctl_args_t *args = arg;
|
| 419 |
|
|
struct rtems_termios_tty *tty = args->iop->data1;
|
| 420 |
|
|
rtems_status_code sc;
|
| 421 |
|
|
|
| 422 |
|
|
args->ioctl_return = 0;
|
| 423 |
|
|
sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 424 |
|
|
if (sc != RTEMS_SUCCESSFUL) {
|
| 425 |
|
|
args->ioctl_return = sc;
|
| 426 |
|
|
return sc;
|
| 427 |
|
|
}
|
| 428 |
|
|
switch (args->command) {
|
| 429 |
|
|
default:
|
| 430 |
|
|
sc = RTEMS_INVALID_NUMBER;
|
| 431 |
|
|
break;
|
| 432 |
|
|
|
| 433 |
|
|
case RTEMS_IO_GET_ATTRIBUTES:
|
| 434 |
|
|
*(struct termios *)args->buffer = tty->termios;
|
| 435 |
|
|
break;
|
| 436 |
|
|
|
| 437 |
|
|
case RTEMS_IO_SET_ATTRIBUTES:
|
| 438 |
|
|
tty->termios = *(struct termios *)args->buffer;
|
| 439 |
|
|
|
| 440 |
|
|
/* check for and process change in flow control options */
|
| 441 |
|
|
termios_set_flowctrl(tty);
|
| 442 |
|
|
|
| 443 |
|
|
if (tty->termios.c_lflag & ICANON) {
|
| 444 |
|
|
tty->rawInBufSemaphoreOptions = RTEMS_WAIT;
|
| 445 |
|
|
tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT;
|
| 446 |
|
|
tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT;
|
| 447 |
|
|
}
|
| 448 |
|
|
else {
|
| 449 |
|
|
rtems_interval ticksPerSecond;
|
| 450 |
|
|
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond);
|
| 451 |
|
|
tty->vtimeTicks = tty->termios.c_cc[VTIME] * ticksPerSecond / 10;
|
| 452 |
|
|
if (tty->termios.c_cc[VTIME]) {
|
| 453 |
|
|
tty->rawInBufSemaphoreOptions = RTEMS_WAIT;
|
| 454 |
|
|
tty->rawInBufSemaphoreTimeout = tty->vtimeTicks;
|
| 455 |
|
|
if (tty->termios.c_cc[VMIN])
|
| 456 |
|
|
tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT;
|
| 457 |
|
|
else
|
| 458 |
|
|
tty->rawInBufSemaphoreFirstTimeout = tty->vtimeTicks;
|
| 459 |
|
|
}
|
| 460 |
|
|
else {
|
| 461 |
|
|
if (tty->termios.c_cc[VMIN]) {
|
| 462 |
|
|
tty->rawInBufSemaphoreOptions = RTEMS_WAIT;
|
| 463 |
|
|
tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT;
|
| 464 |
|
|
tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT;
|
| 465 |
|
|
}
|
| 466 |
|
|
else {
|
| 467 |
|
|
tty->rawInBufSemaphoreOptions = RTEMS_NO_WAIT;
|
| 468 |
|
|
}
|
| 469 |
|
|
}
|
| 470 |
|
|
}
|
| 471 |
|
|
if (tty->device.setAttributes)
|
| 472 |
|
|
(*tty->device.setAttributes)(tty->minor, &tty->termios);
|
| 473 |
|
|
break;
|
| 474 |
|
|
|
| 475 |
|
|
case RTEMS_IO_TCDRAIN:
|
| 476 |
|
|
drainOutput (tty);
|
| 477 |
|
|
break;
|
| 478 |
|
|
}
|
| 479 |
|
|
rtems_semaphore_release (tty->osem);
|
| 480 |
|
|
args->ioctl_return = sc;
|
| 481 |
|
|
return sc;
|
| 482 |
|
|
}
|
| 483 |
|
|
|
| 484 |
|
|
/*
|
| 485 |
|
|
* Send characters to device-specific code
|
| 486 |
|
|
*/
|
| 487 |
|
|
static void
|
| 488 |
|
|
osend (const char *buf, int len, struct rtems_termios_tty *tty)
|
| 489 |
|
|
{
|
| 490 |
|
|
unsigned int newHead;
|
| 491 |
|
|
rtems_interrupt_level level;
|
| 492 |
|
|
rtems_status_code sc;
|
| 493 |
|
|
|
| 494 |
|
|
if (!tty->device.outputUsesInterrupts) {
|
| 495 |
|
|
(*tty->device.write)(tty->minor, buf, len);
|
| 496 |
|
|
return;
|
| 497 |
|
|
}
|
| 498 |
|
|
newHead = tty->rawOutBufHead;
|
| 499 |
|
|
while (len) {
|
| 500 |
|
|
/*
|
| 501 |
|
|
* Performance improvement could be made here.
|
| 502 |
|
|
* Copy multiple bytes to raw buffer:
|
| 503 |
|
|
* if (len > 1) && (space to buffer end, or tail > 1)
|
| 504 |
|
|
* ncopy = MIN (len, space to buffer end or tail)
|
| 505 |
|
|
* memcpy (raw buffer, buf, ncopy)
|
| 506 |
|
|
* buf += ncopy
|
| 507 |
|
|
* len -= ncopy
|
| 508 |
|
|
*
|
| 509 |
|
|
* To minimize latency, the memcpy should be done
|
| 510 |
|
|
* with interrupts enabled.
|
| 511 |
|
|
*/
|
| 512 |
|
|
newHead = (newHead + 1) % RAW_OUTPUT_BUFFER_SIZE;
|
| 513 |
|
|
rtems_interrupt_disable (level);
|
| 514 |
|
|
while (newHead == tty->rawOutBufTail) {
|
| 515 |
|
|
tty->rawOutBufState = rob_wait;
|
| 516 |
|
|
rtems_interrupt_enable (level);
|
| 517 |
|
|
sc = rtems_semaphore_obtain (tty->rawOutBufSemaphore,
|
| 518 |
|
|
RTEMS_WAIT,
|
| 519 |
|
|
RTEMS_NO_TIMEOUT);
|
| 520 |
|
|
if (sc != RTEMS_SUCCESSFUL)
|
| 521 |
|
|
rtems_fatal_error_occurred (sc);
|
| 522 |
|
|
rtems_interrupt_disable (level);
|
| 523 |
|
|
}
|
| 524 |
|
|
tty->rawOutBuf[tty->rawOutBufHead] = *buf++;
|
| 525 |
|
|
tty->rawOutBufHead = newHead;
|
| 526 |
|
|
if (tty->rawOutBufState == rob_idle) {
|
| 527 |
|
|
/* check, whether XOFF has been received */
|
| 528 |
|
|
if (!(tty->flow_ctrl & FL_ORCVXOF)) {
|
| 529 |
|
|
(*tty->device.write)(tty->minor,
|
| 530 |
|
|
(char *)&tty->rawOutBuf[tty->rawOutBufTail],1);
|
| 531 |
|
|
}
|
| 532 |
|
|
else {
|
| 533 |
|
|
/* remember that output has been stopped due to flow ctrl*/
|
| 534 |
|
|
tty->flow_ctrl |= FL_OSTOP;
|
| 535 |
|
|
}
|
| 536 |
|
|
tty->rawOutBufState = rob_busy;
|
| 537 |
|
|
}
|
| 538 |
|
|
rtems_interrupt_enable (level);
|
| 539 |
|
|
len--;
|
| 540 |
|
|
}
|
| 541 |
|
|
}
|
| 542 |
|
|
|
| 543 |
|
|
/*
|
| 544 |
|
|
* Handle output processing
|
| 545 |
|
|
*/
|
| 546 |
|
|
static void
|
| 547 |
|
|
oproc (unsigned char c, struct rtems_termios_tty *tty)
|
| 548 |
|
|
{
|
| 549 |
|
|
int i;
|
| 550 |
|
|
|
| 551 |
|
|
if (tty->termios.c_oflag & OPOST) {
|
| 552 |
|
|
switch (c) {
|
| 553 |
|
|
case '\n':
|
| 554 |
|
|
if (tty->termios.c_oflag & ONLRET)
|
| 555 |
|
|
tty->column = 0;
|
| 556 |
|
|
if (tty->termios.c_oflag & ONLCR) {
|
| 557 |
|
|
osend ("\r", 1, tty);
|
| 558 |
|
|
tty->column = 0;
|
| 559 |
|
|
}
|
| 560 |
|
|
break;
|
| 561 |
|
|
|
| 562 |
|
|
case '\r':
|
| 563 |
|
|
if ((tty->termios.c_oflag & ONOCR) && (tty->column == 0))
|
| 564 |
|
|
return;
|
| 565 |
|
|
if (tty->termios.c_oflag & OCRNL) {
|
| 566 |
|
|
c = '\n';
|
| 567 |
|
|
if (tty->termios.c_oflag & ONLRET)
|
| 568 |
|
|
tty->column = 0;
|
| 569 |
|
|
break;
|
| 570 |
|
|
}
|
| 571 |
|
|
tty->column = 0;
|
| 572 |
|
|
break;
|
| 573 |
|
|
|
| 574 |
|
|
case '\t':
|
| 575 |
|
|
i = 8 - (tty->column & 7);
|
| 576 |
|
|
if ((tty->termios.c_oflag & TABDLY) == XTABS) {
|
| 577 |
|
|
tty->column += i;
|
| 578 |
|
|
osend ( " ", i, tty);
|
| 579 |
|
|
return;
|
| 580 |
|
|
}
|
| 581 |
|
|
tty->column += i;
|
| 582 |
|
|
break;
|
| 583 |
|
|
|
| 584 |
|
|
case '\b':
|
| 585 |
|
|
if (tty->column > 0)
|
| 586 |
|
|
tty->column--;
|
| 587 |
|
|
break;
|
| 588 |
|
|
|
| 589 |
|
|
default:
|
| 590 |
|
|
if (tty->termios.c_oflag & OLCUC)
|
| 591 |
|
|
c = toupper(c);
|
| 592 |
|
|
if (!iscntrl(c))
|
| 593 |
|
|
tty->column++;
|
| 594 |
|
|
break;
|
| 595 |
|
|
}
|
| 596 |
|
|
}
|
| 597 |
|
|
osend (&c, 1, tty);
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
rtems_status_code
|
| 601 |
|
|
rtems_termios_write (void *arg)
|
| 602 |
|
|
{
|
| 603 |
|
|
rtems_libio_rw_args_t *args = arg;
|
| 604 |
|
|
struct rtems_termios_tty *tty = args->iop->data1;
|
| 605 |
|
|
rtems_status_code sc;
|
| 606 |
|
|
|
| 607 |
|
|
sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 608 |
|
|
if (sc != RTEMS_SUCCESSFUL)
|
| 609 |
|
|
return sc;
|
| 610 |
|
|
if (tty->termios.c_oflag & OPOST) {
|
| 611 |
|
|
unsigned32 count = args->count;
|
| 612 |
|
|
unsigned8 *buffer = args->buffer;
|
| 613 |
|
|
while (count--)
|
| 614 |
|
|
oproc (*buffer++, tty);
|
| 615 |
|
|
args->bytes_moved = args->count;
|
| 616 |
|
|
}
|
| 617 |
|
|
else {
|
| 618 |
|
|
osend (args->buffer, args->count, tty);
|
| 619 |
|
|
args->bytes_moved = args->count;
|
| 620 |
|
|
}
|
| 621 |
|
|
rtems_semaphore_release (tty->osem);
|
| 622 |
|
|
return sc;
|
| 623 |
|
|
}
|
| 624 |
|
|
|
| 625 |
|
|
/*
|
| 626 |
|
|
* Echo a typed character
|
| 627 |
|
|
*/
|
| 628 |
|
|
static void
|
| 629 |
|
|
echo (unsigned char c, struct rtems_termios_tty *tty)
|
| 630 |
|
|
{
|
| 631 |
|
|
if ((tty->termios.c_lflag & ECHOCTL) && iscntrl(c) && (c != '\t') && (c != '\n')) {
|
| 632 |
|
|
char echobuf[2];
|
| 633 |
|
|
|
| 634 |
|
|
echobuf[0] = '^';
|
| 635 |
|
|
echobuf[1] = c ^ 0x40;
|
| 636 |
|
|
osend (echobuf, 2, tty);
|
| 637 |
|
|
tty->column += 2;
|
| 638 |
|
|
}
|
| 639 |
|
|
else {
|
| 640 |
|
|
oproc (c, tty);
|
| 641 |
|
|
}
|
| 642 |
|
|
}
|
| 643 |
|
|
|
| 644 |
|
|
/*
|
| 645 |
|
|
* Erase a character or line
|
| 646 |
|
|
* FIXME: Needs support for WERASE and ECHOPRT.
|
| 647 |
|
|
* FIXME: Some of the tests should check for IEXTEN, too.
|
| 648 |
|
|
*/
|
| 649 |
|
|
static void
|
| 650 |
|
|
erase (struct rtems_termios_tty *tty, int lineFlag)
|
| 651 |
|
|
{
|
| 652 |
|
|
if (tty->ccount == 0)
|
| 653 |
|
|
return;
|
| 654 |
|
|
if (lineFlag) {
|
| 655 |
|
|
if (!(tty->termios.c_lflag & ECHO)) {
|
| 656 |
|
|
tty->ccount = 0;
|
| 657 |
|
|
return;
|
| 658 |
|
|
}
|
| 659 |
|
|
if (!(tty->termios.c_lflag & ECHOE)) {
|
| 660 |
|
|
tty->ccount = 0;
|
| 661 |
|
|
echo (tty->termios.c_cc[VKILL], tty);
|
| 662 |
|
|
if (tty->termios.c_lflag & ECHOK)
|
| 663 |
|
|
echo ('\n', tty);
|
| 664 |
|
|
return;
|
| 665 |
|
|
}
|
| 666 |
|
|
}
|
| 667 |
|
|
while (tty->ccount) {
|
| 668 |
|
|
unsigned char c = tty->cbuf[--tty->ccount];
|
| 669 |
|
|
|
| 670 |
|
|
if (tty->termios.c_lflag & ECHO) {
|
| 671 |
|
|
if (!lineFlag && !(tty->termios.c_lflag & ECHOE)) {
|
| 672 |
|
|
echo (tty->termios.c_cc[VERASE], tty);
|
| 673 |
|
|
}
|
| 674 |
|
|
else if (c == '\t') {
|
| 675 |
|
|
int col = tty->read_start_column;
|
| 676 |
|
|
int i = 0;
|
| 677 |
|
|
|
| 678 |
|
|
/*
|
| 679 |
|
|
* Find the character before the tab
|
| 680 |
|
|
*/
|
| 681 |
|
|
while (i != tty->ccount) {
|
| 682 |
|
|
c = tty->cbuf[i++];
|
| 683 |
|
|
if (c == '\t') {
|
| 684 |
|
|
col = (col | 7) + 1;
|
| 685 |
|
|
}
|
| 686 |
|
|
else if (iscntrl (c)) {
|
| 687 |
|
|
if (tty->termios.c_lflag & ECHOCTL)
|
| 688 |
|
|
col += 2;
|
| 689 |
|
|
}
|
| 690 |
|
|
else {
|
| 691 |
|
|
col++;
|
| 692 |
|
|
}
|
| 693 |
|
|
}
|
| 694 |
|
|
|
| 695 |
|
|
/*
|
| 696 |
|
|
* Back up over the tab
|
| 697 |
|
|
*/
|
| 698 |
|
|
while (tty->column > col) {
|
| 699 |
|
|
osend ("\b", 1, tty);
|
| 700 |
|
|
tty->column--;
|
| 701 |
|
|
}
|
| 702 |
|
|
}
|
| 703 |
|
|
else {
|
| 704 |
|
|
if (iscntrl (c) && (tty->termios.c_lflag & ECHOCTL)) {
|
| 705 |
|
|
osend ("\b \b", 3, tty);
|
| 706 |
|
|
if (tty->column)
|
| 707 |
|
|
tty->column--;
|
| 708 |
|
|
}
|
| 709 |
|
|
if (!iscntrl (c) || (tty->termios.c_lflag & ECHOCTL)) {
|
| 710 |
|
|
osend ("\b \b", 3, tty);
|
| 711 |
|
|
if (tty->column)
|
| 712 |
|
|
tty->column--;
|
| 713 |
|
|
}
|
| 714 |
|
|
}
|
| 715 |
|
|
}
|
| 716 |
|
|
if (!lineFlag)
|
| 717 |
|
|
break;
|
| 718 |
|
|
}
|
| 719 |
|
|
}
|
| 720 |
|
|
|
| 721 |
|
|
/*
|
| 722 |
|
|
* Process a single input character
|
| 723 |
|
|
*/
|
| 724 |
|
|
static int
|
| 725 |
|
|
iproc (unsigned char c, struct rtems_termios_tty *tty)
|
| 726 |
|
|
{
|
| 727 |
|
|
if (tty->termios.c_iflag & ISTRIP)
|
| 728 |
|
|
c &= 0x7f;
|
| 729 |
|
|
if (tty->termios.c_iflag & IUCLC)
|
| 730 |
|
|
c = tolower (c);
|
| 731 |
|
|
if (c == '\r') {
|
| 732 |
|
|
if (tty->termios.c_iflag & IGNCR)
|
| 733 |
|
|
return 0;
|
| 734 |
|
|
if (tty->termios.c_iflag & ICRNL)
|
| 735 |
|
|
c = '\n';
|
| 736 |
|
|
}
|
| 737 |
|
|
else if ((c == '\n') && (tty->termios.c_iflag & INLCR)) {
|
| 738 |
|
|
c = '\r';
|
| 739 |
|
|
}
|
| 740 |
|
|
if ((c != '\0') && (tty->termios.c_lflag & ICANON)) {
|
| 741 |
|
|
if (c == tty->termios.c_cc[VERASE]) {
|
| 742 |
|
|
erase (tty, 0);
|
| 743 |
|
|
return 0;
|
| 744 |
|
|
}
|
| 745 |
|
|
else if (c == tty->termios.c_cc[VKILL]) {
|
| 746 |
|
|
erase (tty, 1);
|
| 747 |
|
|
return 0;
|
| 748 |
|
|
}
|
| 749 |
|
|
else if (c == tty->termios.c_cc[VEOF]) {
|
| 750 |
|
|
return 1;
|
| 751 |
|
|
}
|
| 752 |
|
|
else if (c == '\n') {
|
| 753 |
|
|
if (tty->termios.c_lflag & (ECHO | ECHONL))
|
| 754 |
|
|
echo (c, tty);
|
| 755 |
|
|
tty->cbuf[tty->ccount++] = c;
|
| 756 |
|
|
return 1;
|
| 757 |
|
|
}
|
| 758 |
|
|
else if ((c == tty->termios.c_cc[VEOL])
|
| 759 |
|
|
|| (c == tty->termios.c_cc[VEOL2])) {
|
| 760 |
|
|
if (tty->termios.c_lflag & ECHO)
|
| 761 |
|
|
echo (c, tty);
|
| 762 |
|
|
tty->cbuf[tty->ccount++] = c;
|
| 763 |
|
|
return 1;
|
| 764 |
|
|
}
|
| 765 |
|
|
}
|
| 766 |
|
|
|
| 767 |
|
|
/*
|
| 768 |
|
|
* FIXME: Should do IMAXBEL handling somehow
|
| 769 |
|
|
*/
|
| 770 |
|
|
if (tty->ccount < (CBUFSIZE-1)) {
|
| 771 |
|
|
if (tty->termios.c_lflag & ECHO)
|
| 772 |
|
|
echo (c, tty);
|
| 773 |
|
|
tty->cbuf[tty->ccount++] = c;
|
| 774 |
|
|
}
|
| 775 |
|
|
return 0;
|
| 776 |
|
|
}
|
| 777 |
|
|
|
| 778 |
|
|
/*
|
| 779 |
|
|
* Process input character, with semaphore.
|
| 780 |
|
|
*/
|
| 781 |
|
|
static int
|
| 782 |
|
|
siproc (unsigned char c, struct rtems_termios_tty *tty)
|
| 783 |
|
|
{
|
| 784 |
|
|
int i;
|
| 785 |
|
|
|
| 786 |
|
|
/*
|
| 787 |
|
|
* Obtain output semaphore if character will be echoed
|
| 788 |
|
|
*/
|
| 789 |
|
|
if (tty->termios.c_lflag & (ECHO|ECHOE|ECHOK|ECHONL|ECHOPRT|ECHOCTL|ECHOKE)) {
|
| 790 |
|
|
rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 791 |
|
|
i = iproc (c, tty);
|
| 792 |
|
|
rtems_semaphore_release (tty->osem);
|
| 793 |
|
|
}
|
| 794 |
|
|
else {
|
| 795 |
|
|
i = iproc (c, tty);
|
| 796 |
|
|
}
|
| 797 |
|
|
return i;
|
| 798 |
|
|
}
|
| 799 |
|
|
|
| 800 |
|
|
/*
|
| 801 |
|
|
* Fill the input buffer by polling the device
|
| 802 |
|
|
*/
|
| 803 |
|
|
static rtems_status_code
|
| 804 |
|
|
fillBufferPoll (struct rtems_termios_tty *tty)
|
| 805 |
|
|
{
|
| 806 |
|
|
int n;
|
| 807 |
|
|
|
| 808 |
|
|
if (tty->termios.c_lflag & ICANON) {
|
| 809 |
|
|
for (;;) {
|
| 810 |
|
|
n = (*tty->device.pollRead)(tty->minor);
|
| 811 |
|
|
if (n < 0) {
|
| 812 |
|
|
rtems_task_wake_after (1);
|
| 813 |
|
|
}
|
| 814 |
|
|
else {
|
| 815 |
|
|
if (siproc (n, tty))
|
| 816 |
|
|
break;
|
| 817 |
|
|
}
|
| 818 |
|
|
}
|
| 819 |
|
|
}
|
| 820 |
|
|
else {
|
| 821 |
|
|
rtems_interval then, now;
|
| 822 |
|
|
if (!tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME])
|
| 823 |
|
|
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then);
|
| 824 |
|
|
for (;;) {
|
| 825 |
|
|
n = (*tty->device.pollRead)(tty->minor);
|
| 826 |
|
|
if (n < 0) {
|
| 827 |
|
|
if (tty->termios.c_cc[VMIN]) {
|
| 828 |
|
|
if (tty->termios.c_cc[VTIME] && tty->ccount) {
|
| 829 |
|
|
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
|
| 830 |
|
|
if ((now - then) > tty->vtimeTicks) {
|
| 831 |
|
|
break;
|
| 832 |
|
|
}
|
| 833 |
|
|
}
|
| 834 |
|
|
}
|
| 835 |
|
|
else {
|
| 836 |
|
|
if (!tty->termios.c_cc[VTIME])
|
| 837 |
|
|
break;
|
| 838 |
|
|
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
|
| 839 |
|
|
if ((now - then) > tty->vtimeTicks) {
|
| 840 |
|
|
break;
|
| 841 |
|
|
}
|
| 842 |
|
|
}
|
| 843 |
|
|
rtems_task_wake_after (1);
|
| 844 |
|
|
}
|
| 845 |
|
|
else {
|
| 846 |
|
|
siproc (n, tty);
|
| 847 |
|
|
if (tty->ccount >= tty->termios.c_cc[VMIN])
|
| 848 |
|
|
break;
|
| 849 |
|
|
if (tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME])
|
| 850 |
|
|
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then);
|
| 851 |
|
|
}
|
| 852 |
|
|
}
|
| 853 |
|
|
}
|
| 854 |
|
|
return RTEMS_SUCCESSFUL;
|
| 855 |
|
|
}
|
| 856 |
|
|
|
| 857 |
|
|
/*
|
| 858 |
|
|
* Fill the input buffer from the raw input queue
|
| 859 |
|
|
*/
|
| 860 |
|
|
static rtems_status_code
|
| 861 |
|
|
fillBufferQueue (struct rtems_termios_tty *tty)
|
| 862 |
|
|
{
|
| 863 |
|
|
rtems_interval timeout = tty->rawInBufSemaphoreFirstTimeout;
|
| 864 |
|
|
rtems_status_code sc;
|
| 865 |
|
|
|
| 866 |
|
|
for (;;) {
|
| 867 |
|
|
/*
|
| 868 |
|
|
* Process characters read from raw queue
|
| 869 |
|
|
*/
|
| 870 |
|
|
while (tty->rawInBufHead != tty->rawInBufTail) {
|
| 871 |
|
|
unsigned char c;
|
| 872 |
|
|
unsigned int newHead;
|
| 873 |
|
|
|
| 874 |
|
|
newHead = (tty->rawInBufHead + 1) % RAW_INPUT_BUFFER_SIZE;
|
| 875 |
|
|
c = tty->rawInBuf[newHead];
|
| 876 |
|
|
tty->rawInBufHead = newHead;
|
| 877 |
|
|
if(((tty->rawInBufTail-newHead+RAW_INPUT_BUFFER_SIZE)
|
| 878 |
|
|
% RAW_INPUT_BUFFER_SIZE)
|
| 879 |
|
|
< tty->lowwater) {
|
| 880 |
|
|
tty->flow_ctrl &= ~FL_IREQXOF;
|
| 881 |
|
|
/* if tx stopped and XON should be sent... */
|
| 882 |
|
|
if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
|
| 883 |
|
|
== (FL_MDXON | FL_ISNTXOF))
|
| 884 |
|
|
&& ((tty->rawOutBufState == rob_idle)
|
| 885 |
|
|
|| (tty->flow_ctrl & FL_OSTOP))) {
|
| 886 |
|
|
/* XON should be sent now... */
|
| 887 |
|
|
(*tty->device.write)(tty->minor,
|
| 888 |
|
|
&(tty->termios.c_cc[VSTART]),
|
| 889 |
|
|
1);
|
| 890 |
|
|
}
|
| 891 |
|
|
else if (tty->flow_ctrl & FL_MDRTS) {
|
| 892 |
|
|
tty->flow_ctrl &= ~FL_IRTSOFF;
|
| 893 |
|
|
/* activate RTS line */
|
| 894 |
|
|
if (tty->device.startRemoteTx != NULL) {
|
| 895 |
|
|
tty->device.startRemoteTx(tty->minor);
|
| 896 |
|
|
}
|
| 897 |
|
|
}
|
| 898 |
|
|
}
|
| 899 |
|
|
|
| 900 |
|
|
/* continue processing new character */
|
| 901 |
|
|
if (tty->termios.c_lflag & ICANON) {
|
| 902 |
|
|
if (siproc (c, tty))
|
| 903 |
|
|
return RTEMS_SUCCESSFUL;
|
| 904 |
|
|
}
|
| 905 |
|
|
else {
|
| 906 |
|
|
siproc (c, tty);
|
| 907 |
|
|
if (tty->ccount >= tty->termios.c_cc[VMIN])
|
| 908 |
|
|
return RTEMS_SUCCESSFUL;
|
| 909 |
|
|
}
|
| 910 |
|
|
timeout = tty->rawInBufSemaphoreTimeout;
|
| 911 |
|
|
}
|
| 912 |
|
|
|
| 913 |
|
|
/*
|
| 914 |
|
|
* Wait for characters
|
| 915 |
|
|
*/
|
| 916 |
|
|
sc = rtems_semaphore_obtain (tty->rawInBufSemaphore,
|
| 917 |
|
|
tty->rawInBufSemaphoreOptions,
|
| 918 |
|
|
timeout);
|
| 919 |
|
|
if (sc != RTEMS_SUCCESSFUL)
|
| 920 |
|
|
break;
|
| 921 |
|
|
}
|
| 922 |
|
|
return RTEMS_SUCCESSFUL;
|
| 923 |
|
|
}
|
| 924 |
|
|
|
| 925 |
|
|
rtems_status_code
|
| 926 |
|
|
rtems_termios_read (void *arg)
|
| 927 |
|
|
{
|
| 928 |
|
|
rtems_libio_rw_args_t *args = arg;
|
| 929 |
|
|
struct rtems_termios_tty *tty = args->iop->data1;
|
| 930 |
|
|
unsigned32 count = args->count;
|
| 931 |
|
|
unsigned8 *buffer = args->buffer;
|
| 932 |
|
|
rtems_status_code sc;
|
| 933 |
|
|
|
| 934 |
|
|
sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
|
| 935 |
|
|
if (sc != RTEMS_SUCCESSFUL)
|
| 936 |
|
|
return sc;
|
| 937 |
|
|
if (tty->cindex == tty->ccount) {
|
| 938 |
|
|
tty->cindex = tty->ccount = 0;
|
| 939 |
|
|
tty->read_start_column = tty->column;
|
| 940 |
|
|
if (tty->device.pollRead)
|
| 941 |
|
|
sc = fillBufferPoll (tty);
|
| 942 |
|
|
else
|
| 943 |
|
|
sc = fillBufferQueue (tty);
|
| 944 |
|
|
if (sc != RTEMS_SUCCESSFUL)
|
| 945 |
|
|
tty->cindex = tty->ccount = 0;
|
| 946 |
|
|
}
|
| 947 |
|
|
while (count && (tty->cindex < tty->ccount)) {
|
| 948 |
|
|
*buffer++ = tty->cbuf[tty->cindex++];
|
| 949 |
|
|
count--;
|
| 950 |
|
|
}
|
| 951 |
|
|
args->bytes_moved = args->count - count;
|
| 952 |
|
|
rtems_semaphore_release (tty->isem);
|
| 953 |
|
|
return sc;
|
| 954 |
|
|
}
|
| 955 |
|
|
|
| 956 |
|
|
/*
|
| 957 |
|
|
* Place characters on raw queue.
|
| 958 |
|
|
* NOTE: This routine runs in the context of the
|
| 959 |
|
|
* device receive interrupt handler.
|
| 960 |
|
|
* Returns the number of characters dropped because of overflow.
|
| 961 |
|
|
*/
|
| 962 |
|
|
int
|
| 963 |
|
|
rtems_termios_enqueue_raw_characters (void *ttyp, char *buf, int len)
|
| 964 |
|
|
{
|
| 965 |
|
|
struct rtems_termios_tty *tty = ttyp;
|
| 966 |
|
|
unsigned int newTail;
|
| 967 |
|
|
char c;
|
| 968 |
|
|
int dropped = 0;
|
| 969 |
|
|
boolean flow_rcv = FALSE; /* TRUE, if flow control char received */
|
| 970 |
|
|
rtems_interrupt_level level;
|
| 971 |
|
|
|
| 972 |
|
|
while (len--) {
|
| 973 |
|
|
c = *buf++;
|
| 974 |
|
|
/* FIXME: implement IXANY: any character restarts output */
|
| 975 |
|
|
/* if incoming XON/XOFF controls outgoing stream: */
|
| 976 |
|
|
if (tty->flow_ctrl & FL_MDXON) {
|
| 977 |
|
|
/* if received char is V_STOP and V_START (both are equal value) */
|
| 978 |
|
|
if (c == tty->termios.c_cc[VSTOP]) {
|
| 979 |
|
|
if (c == tty->termios.c_cc[VSTART]) {
|
| 980 |
|
|
/* received VSTOP and VSTART==VSTOP? */
|
| 981 |
|
|
/* then toggle "stop output" status */
|
| 982 |
|
|
tty->flow_ctrl = tty->flow_ctrl ^ FL_ORCVXOF;
|
| 983 |
|
|
}
|
| 984 |
|
|
else {
|
| 985 |
|
|
/* VSTOP received (other code than VSTART) */
|
| 986 |
|
|
/* stop output */
|
| 987 |
|
|
tty->flow_ctrl |= FL_ORCVXOF;
|
| 988 |
|
|
}
|
| 989 |
|
|
flow_rcv = TRUE;
|
| 990 |
|
|
}
|
| 991 |
|
|
else if (c == tty->termios.c_cc[VSTART]) {
|
| 992 |
|
|
/* VSTART received */
|
| 993 |
|
|
/* restart output */
|
| 994 |
|
|
tty->flow_ctrl &= ~FL_ORCVXOF;
|
| 995 |
|
|
flow_rcv = TRUE;
|
| 996 |
|
|
}
|
| 997 |
|
|
}
|
| 998 |
|
|
if (flow_rcv) {
|
| 999 |
|
|
/* restart output according to FL_ORCVXOF flag */
|
| 1000 |
|
|
if ((tty->flow_ctrl & (FL_ORCVXOF | FL_OSTOP)) == FL_OSTOP) {
|
| 1001 |
|
|
/* disable interrupts */
|
| 1002 |
|
|
rtems_interrupt_disable(level);
|
| 1003 |
|
|
tty->flow_ctrl &= ~FL_OSTOP;
|
| 1004 |
|
|
/* check for chars in output buffer (or rob_state?) */
|
| 1005 |
|
|
if (tty->rawOutBufState != rob_idle) {
|
| 1006 |
|
|
/* if chars available, call write function... */
|
| 1007 |
|
|
(*tty->device.write)(tty->minor,
|
| 1008 |
|
|
(char *)&tty->rawOutBuf[tty->rawOutBufTail], 1);
|
| 1009 |
|
|
}
|
| 1010 |
|
|
/* reenable interrupts */
|
| 1011 |
|
|
rtems_interrupt_enable(level);
|
| 1012 |
|
|
}
|
| 1013 |
|
|
}
|
| 1014 |
|
|
else {
|
| 1015 |
|
|
newTail = (tty->rawInBufTail + 1) % RAW_INPUT_BUFFER_SIZE;
|
| 1016 |
|
|
/* if chars_in_buffer > highwater */
|
| 1017 |
|
|
rtems_interrupt_disable(level);
|
| 1018 |
|
|
if ((((newTail - tty->rawInBufHead + RAW_INPUT_BUFFER_SIZE)
|
| 1019 |
|
|
% RAW_INPUT_BUFFER_SIZE)
|
| 1020 |
|
|
> tty->highwater) &&
|
| 1021 |
|
|
!(tty->flow_ctrl & FL_IREQXOF)) {
|
| 1022 |
|
|
/* incoming data stream should be stopped */
|
| 1023 |
|
|
tty->flow_ctrl |= FL_IREQXOF;
|
| 1024 |
|
|
if ((tty->flow_ctrl & (FL_MDXOF | FL_ISNTXOF))
|
| 1025 |
|
|
== (FL_MDXOF ) ){
|
| 1026 |
|
|
if ((tty->flow_ctrl & FL_OSTOP) ||
|
| 1027 |
|
|
(tty->rawOutBufState == rob_idle)) {
|
| 1028 |
|
|
/* if tx is stopped due to XOFF or out of data */
|
| 1029 |
|
|
/* call write function here */
|
| 1030 |
|
|
tty->flow_ctrl |= FL_ISNTXOF;
|
| 1031 |
|
|
(*tty->device.write)(tty->minor,
|
| 1032 |
|
|
&(tty->termios.c_cc[VSTOP]),
|
| 1033 |
|
|
1);
|
| 1034 |
|
|
}
|
| 1035 |
|
|
}
|
| 1036 |
|
|
else if ((tty->flow_ctrl & (FL_MDRTS | FL_IRTSOFF))
|
| 1037 |
|
|
== (FL_MDRTS ) ) {
|
| 1038 |
|
|
tty->flow_ctrl |= FL_IRTSOFF;
|
| 1039 |
|
|
/* deactivate RTS line */
|
| 1040 |
|
|
if (tty->device.stopRemoteTx != NULL) {
|
| 1041 |
|
|
tty->device.stopRemoteTx(tty->minor);
|
| 1042 |
|
|
}
|
| 1043 |
|
|
}
|
| 1044 |
|
|
}
|
| 1045 |
|
|
/* reenable interrupts */
|
| 1046 |
|
|
rtems_interrupt_enable(level);
|
| 1047 |
|
|
|
| 1048 |
|
|
if (newTail == tty->rawInBufHead) {
|
| 1049 |
|
|
dropped++;
|
| 1050 |
|
|
}
|
| 1051 |
|
|
else {
|
| 1052 |
|
|
tty->rawInBuf[newTail] = c;
|
| 1053 |
|
|
tty->rawInBufTail = newTail;
|
| 1054 |
|
|
}
|
| 1055 |
|
|
}
|
| 1056 |
|
|
}
|
| 1057 |
|
|
tty->rawInBufDropped += dropped;
|
| 1058 |
|
|
rtems_semaphore_release (tty->rawInBufSemaphore);
|
| 1059 |
|
|
return dropped;
|
| 1060 |
|
|
}
|
| 1061 |
|
|
|
| 1062 |
|
|
/*
|
| 1063 |
|
|
* Characters have been transmitted
|
| 1064 |
|
|
* NOTE: This routine runs in the context of the
|
| 1065 |
|
|
* device transmit interrupt handler.
|
| 1066 |
|
|
* The second argument is the number of characters transmitted so far.
|
| 1067 |
|
|
* This value will always be 1 for devices which generate an interrupt
|
| 1068 |
|
|
* for each transmitted character.
|
| 1069 |
|
|
* It returns number of characters left to transmit
|
| 1070 |
|
|
*/
|
| 1071 |
|
|
int
|
| 1072 |
|
|
rtems_termios_dequeue_characters (void *ttyp, int len)
|
| 1073 |
|
|
{
|
| 1074 |
|
|
struct rtems_termios_tty *tty = ttyp;
|
| 1075 |
|
|
unsigned int newTail;
|
| 1076 |
|
|
int nToSend;
|
| 1077 |
|
|
|
| 1078 |
|
|
/* check for XOF/XON to send */
|
| 1079 |
|
|
if ((tty->flow_ctrl & (FL_MDXOF | FL_IREQXOF | FL_ISNTXOF))
|
| 1080 |
|
|
== (FL_MDXOF | FL_IREQXOF)) {
|
| 1081 |
|
|
/* XOFF should be sent now... */
|
| 1082 |
|
|
(*tty->device.write)(tty->minor,
|
| 1083 |
|
|
&(tty->termios.c_cc[VSTOP]), 1);
|
| 1084 |
|
|
tty->flow_ctrl |= FL_ISNTXOF;
|
| 1085 |
|
|
nToSend = 1;
|
| 1086 |
|
|
}
|
| 1087 |
|
|
else if ((tty->flow_ctrl & (FL_IREQXOF | FL_ISNTXOF))
|
| 1088 |
|
|
== FL_ISNTXOF) {
|
| 1089 |
|
|
/* NOTE: send XON even, if no longer in XON/XOFF mode... */
|
| 1090 |
|
|
/* XON should be sent now... */
|
| 1091 |
|
|
(*tty->device.write)(tty->minor,
|
| 1092 |
|
|
&(tty->termios.c_cc[VSTART]), 1);
|
| 1093 |
|
|
tty->flow_ctrl &= ~FL_ISNTXOF;
|
| 1094 |
|
|
nToSend = 1;
|
| 1095 |
|
|
}
|
| 1096 |
|
|
else {
|
| 1097 |
|
|
if (tty->rawOutBufState == rob_wait)
|
| 1098 |
|
|
rtems_semaphore_release (tty->rawOutBufSemaphore);
|
| 1099 |
|
|
if ( tty->rawOutBufHead == tty->rawOutBufTail )
|
| 1100 |
|
|
return 0;
|
| 1101 |
|
|
newTail = (tty->rawOutBufTail + len) % RAW_OUTPUT_BUFFER_SIZE;
|
| 1102 |
|
|
if (newTail == tty->rawOutBufHead) {
|
| 1103 |
|
|
/*
|
| 1104 |
|
|
* Buffer empty
|
| 1105 |
|
|
*/
|
| 1106 |
|
|
tty->rawOutBufState = rob_idle;
|
| 1107 |
|
|
nToSend = 0;
|
| 1108 |
|
|
}
|
| 1109 |
|
|
/* check, whether output should stop due to received XOFF */
|
| 1110 |
|
|
else if ((tty->flow_ctrl & (FL_MDXON | FL_ORCVXOF))
|
| 1111 |
|
|
== (FL_MDXON | FL_ORCVXOF)) {
|
| 1112 |
|
|
/* Buffer not empty, but output stops due to XOFF */
|
| 1113 |
|
|
/* set flag, that output has been stopped */
|
| 1114 |
|
|
tty->flow_ctrl |= FL_OSTOP;
|
| 1115 |
|
|
nToSend = 0;
|
| 1116 |
|
|
}
|
| 1117 |
|
|
else {
|
| 1118 |
|
|
/*
|
| 1119 |
|
|
* Buffer not empty, start tranmitter
|
| 1120 |
|
|
*/
|
| 1121 |
|
|
if (newTail > tty->rawOutBufHead)
|
| 1122 |
|
|
nToSend = RAW_OUTPUT_BUFFER_SIZE - newTail;
|
| 1123 |
|
|
else
|
| 1124 |
|
|
nToSend = tty->rawOutBufHead - newTail;
|
| 1125 |
|
|
/* when flow control XON or XOF, don't send blocks of data */
|
| 1126 |
|
|
/* to allow fast reaction on incoming flow ctrl and low latency*/
|
| 1127 |
|
|
/* for outgoing flow control */
|
| 1128 |
|
|
if (tty->flow_ctrl & (FL_MDXON | FL_MDXOF)) {
|
| 1129 |
|
|
nToSend = 1;
|
| 1130 |
|
|
}
|
| 1131 |
|
|
(*tty->device.write)(tty->minor, (char *)&tty->rawOutBuf[newTail], nToSend);
|
| 1132 |
|
|
tty->rawOutBufState = rob_busy;
|
| 1133 |
|
|
}
|
| 1134 |
|
|
tty->rawOutBufTail = newTail;
|
| 1135 |
|
|
}
|
| 1136 |
|
|
return nToSend;
|
| 1137 |
|
|
}
|
| 1138 |
|
|
|
| 1139 |
|
|
|
