diff options
Diffstat (limited to 'cpukit/libcsupport/src/termios.c')
| -rw-r--r-- | cpukit/libcsupport/src/termios.c | 935 |
1 files changed, 0 insertions, 935 deletions
diff --git a/cpukit/libcsupport/src/termios.c b/cpukit/libcsupport/src/termios.c deleted file mode 100644 index c2a43c7707..0000000000 --- a/cpukit/libcsupport/src/termios.c +++ /dev/null @@ -1,935 +0,0 @@ -/* - * TERMIOS serial line support - * - * Author: - * W. Eric Norum - * Saskatchewan Accelerator Laboratory - * University of Saskatchewan - * Saskatoon, Saskatchewan, CANADA - * eric@skatter.usask.ca - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.OARcorp.com/rtems/license.html. - * - * $Id$ - */ - -#include <rtems.h> -#include <rtems/libio.h> -#include <ctype.h> -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <termios.h> -#include <unistd.h> - -/* - * FreeBSD does not support a full POSIX termios so we have to help it out - */ - - -#if defined(__FreeBSD__) -#define XTABS 0 -#define ONLRET 0 -#define ONOCR 0 -#define TABDLY 0 -#define OLCUC 0 -#define ILCUC 0 -#define OCRNL 0 -#define IUCLC 0 -#endif - -/* - * The size of the cooked buffer - */ -#define CBUFSIZE 256 - -/* - * The sizes of the raw message buffers. - * On most architectures it is quite a bit more - * efficient if these are powers of two. - */ -#define RAW_INPUT_BUFFER_SIZE 128 -#define RAW_OUTPUT_BUFFER_SIZE 64 - -/* - * Variables associated with each termios instance. - * One structure for each hardware I/O device. - */ -struct rtems_termios_tty { - /* - * Linked-list of active TERMIOS devices - */ - struct rtems_termios_tty *forw; - struct rtems_termios_tty *back; - - /* - * How many times has this device been opened - */ - int refcount; - - /* - * This device - */ - rtems_device_major_number major; - rtems_device_major_number minor; - - /* - * Mutual-exclusion semaphores - */ - rtems_id isem; - rtems_id osem; - - /* - * The canonical (cooked) character buffer - */ - char cbuf[CBUFSIZE]; - int ccount; - int cindex; - - /* - * Keep track of cursor (printhead) position - */ - int column; - int read_start_column; - - /* - * The ioctl settings - */ - struct termios termios; - rtems_interval vtimeTicks; - - /* - * Raw input character buffer - */ - volatile char rawInBuf[RAW_INPUT_BUFFER_SIZE]; - volatile unsigned int rawInBufHead; - volatile unsigned int rawInBufTail; - rtems_id rawInBufSemaphore; - rtems_unsigned32 rawInBufSemaphoreOptions; - rtems_interval rawInBufSemaphoreTimeout; - rtems_interval rawInBufSemaphoreFirstTimeout; - unsigned int rawInBufDropped; /* Statistics */ - - /* - * Raw output character buffer - */ - volatile char rawOutBuf[RAW_OUTPUT_BUFFER_SIZE]; - volatile unsigned int rawOutBufHead; - volatile unsigned int rawOutBufTail; - rtems_id rawOutBufSemaphore; - enum {rob_idle, rob_busy, rob_wait } rawOutBufState; - - /* - * Callbacks to device-specific routines - */ - rtems_termios_callbacks device; -}; - -static struct rtems_termios_tty *ttyHead, *ttyTail; -static rtems_id ttyMutex; - -/* - * Reserve enough resources to open every physical device once. - */ - -static int first_time; /* assumed to be zeroed by BSS initialization */ - -void -rtems_termios_reserve_resources ( - rtems_configuration_table *configuration, - rtems_unsigned32 number_of_devices - ) -{ - rtems_api_configuration_table *rtems_config; - - if (!configuration) - rtems_fatal_error_occurred (0xFFF0F001); - rtems_config = configuration->RTEMS_api_configuration; - if (!rtems_config) - rtems_fatal_error_occurred (0xFFF0F002); - if (!first_time) - rtems_config->maximum_semaphores += 1; - first_time = 1; - rtems_config->maximum_semaphores += (4 * number_of_devices); -} - -void -rtems_termios_initialize (void) -{ - rtems_status_code sc; - - /* - * Create the mutex semaphore for the tty list - */ - if (!ttyMutex) { - sc = rtems_semaphore_create ( - rtems_build_name ('T', 'R', 'm', 'i'), - 1, - RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &ttyMutex); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - } -} - -/* - * Open a termios device - */ -rtems_status_code -rtems_termios_open ( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *arg, - const rtems_termios_callbacks *callbacks - ) -{ - rtems_status_code sc; - rtems_libio_open_close_args_t *args = arg; - struct rtems_termios_tty *tty; - - /* - * See if the device has already been opened - */ - sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - return sc; - for (tty = ttyHead ; tty != NULL ; tty = tty->forw) { - if ((tty->major == major) && (tty->minor == minor)) - break; - } - if (tty == NULL) { - static char c = 'a'; - - /* - * Create a new device - */ - tty = calloc (1, sizeof (struct rtems_termios_tty)); - if (tty == NULL) { - rtems_semaphore_release (ttyMutex); - return RTEMS_NO_MEMORY; - } - tty->forw = ttyHead; - ttyHead = tty; - if (ttyTail == NULL) - ttyTail = tty; - - tty->minor = minor; - tty->major = major; - - /* - * Set up mutex semaphores - */ - sc = rtems_semaphore_create ( - rtems_build_name ('T', 'R', 'i', c), - 1, - RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &tty->isem); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - sc = rtems_semaphore_create ( - rtems_build_name ('T', 'R', 'o', c), - 1, - RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &tty->osem); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - sc = rtems_semaphore_create ( - rtems_build_name ('T', 'R', 'x', c), - 0, - RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &tty->rawOutBufSemaphore); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - tty->rawOutBufState = rob_idle; - - /* - * Set callbacks - */ - tty->device = *callbacks; - if (!tty->device.pollRead) { - sc = rtems_semaphore_create ( - rtems_build_name ('T', 'R', 'r', c), - 0, - RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY, - RTEMS_NO_PRIORITY, - &tty->rawInBufSemaphore); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - } - - /* - * Set default parameters - */ - tty->termios.c_iflag = BRKINT | ICRNL | IXON | IMAXBEL; - tty->termios.c_oflag = OPOST | ONLCR | XTABS; - tty->termios.c_cflag = B9600 | CS8 | CREAD; - tty->termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOK | ECHOE | ECHOCTL; - tty->termios.c_cc[VINTR] = '\003'; - tty->termios.c_cc[VQUIT] = '\034'; - tty->termios.c_cc[VERASE] = '\177'; - tty->termios.c_cc[VKILL] = '\025'; - tty->termios.c_cc[VEOF] = '\004'; - tty->termios.c_cc[VEOL] = '\000'; - tty->termios.c_cc[VEOL2] = '\000'; - tty->termios.c_cc[VSTART] = '\021'; - tty->termios.c_cc[VSTOP] = '\023'; - tty->termios.c_cc[VSUSP] = '\032'; - tty->termios.c_cc[VREPRINT] = '\022'; - tty->termios.c_cc[VDISCARD] = '\017'; - tty->termios.c_cc[VWERASE] = '\027'; - tty->termios.c_cc[VLNEXT] = '\026'; - - /* - * Bump name characer - */ - if (c++ == 'z') - c = 'a'; - } - args->iop->data1 = tty; - if (!tty->refcount++ && tty->device.firstOpen) - (*tty->device.firstOpen)(major, minor, arg); - rtems_semaphore_release (ttyMutex); - return RTEMS_SUCCESSFUL; -} - -/* - * Drain output queue - */ -static void -drainOutput (struct rtems_termios_tty *tty) -{ - rtems_interrupt_level level; - rtems_status_code sc; - - if (tty->device.outputUsesInterrupts) { - rtems_interrupt_disable (level); - while (tty->rawOutBufTail != tty->rawOutBufHead) { - tty->rawOutBufState = rob_wait; - rtems_interrupt_enable (level); - sc = rtems_semaphore_obtain (tty->rawOutBufSemaphore, - RTEMS_WAIT, - RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - rtems_interrupt_disable (level); - } - rtems_interrupt_enable (level); - } -} - -rtems_status_code -rtems_termios_close (void *arg) -{ - rtems_libio_open_close_args_t *args = arg; - struct rtems_termios_tty *tty = args->iop->data1; - rtems_status_code sc; - - sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - if (--tty->refcount == 0) { - drainOutput (tty); - if (tty->device.lastClose) - (*tty->device.lastClose)(tty->major, tty->minor, arg); - if (tty->forw == NULL) - ttyTail = tty->back; - else - tty->forw->back = tty->back; - if (tty->back == NULL) - ttyHead = tty->forw; - else - tty->back->forw = tty->forw; - rtems_semaphore_delete (tty->isem); - rtems_semaphore_delete (tty->osem); - rtems_semaphore_delete (tty->rawOutBufSemaphore); - if (!tty->device.pollRead) - rtems_semaphore_delete (tty->rawInBufSemaphore); - free (tty); - } - rtems_semaphore_release (ttyMutex); - return RTEMS_SUCCESSFUL; -} - -rtems_status_code -rtems_termios_ioctl (void *arg) -{ - rtems_libio_ioctl_args_t *args = arg; - struct rtems_termios_tty *tty = args->iop->data1; - rtems_status_code sc; - - args->ioctl_return = 0; - sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) { - args->ioctl_return = sc; - return sc; - } - switch (args->command) { - default: - sc = RTEMS_INVALID_NUMBER; - break; - - case RTEMS_IO_GET_ATTRIBUTES: - *(struct termios *)args->buffer = tty->termios; - break; - - case RTEMS_IO_SET_ATTRIBUTES: - tty->termios = *(struct termios *)args->buffer; - if (tty->termios.c_lflag & ICANON) { - tty->rawInBufSemaphoreOptions = RTEMS_WAIT; - tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; - tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; - } - else { - rtems_interval ticksPerSecond; - rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond); - tty->vtimeTicks = tty->termios.c_cc[VTIME] * ticksPerSecond / 10; - if (tty->termios.c_cc[VTIME]) { - tty->rawInBufSemaphoreOptions = RTEMS_WAIT; - tty->rawInBufSemaphoreTimeout = tty->vtimeTicks; - if (tty->termios.c_cc[VMIN]) - tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; - else - tty->rawInBufSemaphoreFirstTimeout = tty->vtimeTicks; - } - else { - if (tty->termios.c_cc[VMIN]) { - tty->rawInBufSemaphoreOptions = RTEMS_WAIT; - tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; - tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; - } - else { - tty->rawInBufSemaphoreOptions = RTEMS_NO_WAIT; - } - } - } - if (tty->device.setAttributes) - (*tty->device.setAttributes)(tty->minor, &tty->termios); - break; - - case RTEMS_IO_TCDRAIN: - drainOutput (tty); - break; - } - rtems_semaphore_release (tty->osem); - args->ioctl_return = sc; - return sc; -} - -/* - * Send characters to device-specific code - */ -static void -osend (const char *buf, int len, struct rtems_termios_tty *tty) -{ - unsigned int newHead; - rtems_interrupt_level level; - rtems_status_code sc; - - if (!tty->device.outputUsesInterrupts) { - (*tty->device.write)(tty->minor, buf, len); - return; - } - newHead = tty->rawOutBufHead; - while (len) { - /* - * Performance improvement could be made here. - * Copy multiple bytes to raw buffer: - * if (len > 1) && (space to buffer end, or tail > 1) - * ncopy = MIN (len, space to buffer end or tail) - * memcpy (raw buffer, buf, ncopy) - * buf += ncopy - * len -= ncopy - * - * To minimize latency, the memcpy should be done - * with interrupts enabled. - */ - newHead = (newHead + 1) % RAW_OUTPUT_BUFFER_SIZE; - rtems_interrupt_disable (level); - while (newHead == tty->rawOutBufTail) { - tty->rawOutBufState = rob_wait; - rtems_interrupt_enable (level); - sc = rtems_semaphore_obtain (tty->rawOutBufSemaphore, - RTEMS_WAIT, - RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred (sc); - rtems_interrupt_disable (level); - } - tty->rawOutBuf[tty->rawOutBufHead] = *buf++; - tty->rawOutBufHead = newHead; - if (tty->rawOutBufState == rob_idle) { - (*tty->device.write)(tty->minor, - (char *)&tty->rawOutBuf[tty->rawOutBufTail], 1); - tty->rawOutBufState = rob_busy; - } - rtems_interrupt_enable (level); - len--; - } -} - -/* - * Handle output processing - */ -static void -oproc (unsigned char c, struct rtems_termios_tty *tty) -{ - int i; - - if (tty->termios.c_oflag & OPOST) { - switch (c) { - case '\n': - if (tty->termios.c_oflag & ONLRET) - tty->column = 0; - if (tty->termios.c_oflag & ONLCR) { - osend ("\r", 1, tty); - tty->column = 0; - } - break; - - case '\r': - if ((tty->termios.c_oflag & ONOCR) && (tty->column == 0)) - return; - if (tty->termios.c_oflag & OCRNL) { - c = '\n'; - if (tty->termios.c_oflag & ONLRET) - tty->column = 0; - break; - } - tty->column = 0; - break; - - case '\t': - i = 8 - (tty->column & 7); - if ((tty->termios.c_oflag & TABDLY) == XTABS) { - tty->column += i; - osend ( " ", i, tty); - return; - } - tty->column += i; - break; - - case '\b': - if (tty->column > 0) - tty->column--; - break; - - default: - if (tty->termios.c_oflag & OLCUC) - c = toupper(c); - if (!iscntrl(c)) - tty->column++; - break; - } - } - osend (&c, 1, tty); -} - -rtems_status_code -rtems_termios_write (void *arg) -{ - rtems_libio_rw_args_t *args = arg; - struct rtems_termios_tty *tty = args->iop->data1; - rtems_status_code sc; - - sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - return sc; - if (tty->termios.c_oflag & OPOST) { - unsigned32 count = args->count; - unsigned8 *buffer = args->buffer; - while (count--) - oproc (*buffer++, tty); - args->bytes_moved = args->count; - } - else { - osend (args->buffer, args->count, tty); - args->bytes_moved = args->count; - } - rtems_semaphore_release (tty->osem); - return sc; -} - -/* - * Echo a typed character - */ -static void -echo (unsigned char c, struct rtems_termios_tty *tty) -{ - if ((tty->termios.c_lflag & ECHOCTL) && iscntrl(c) && (c != '\t') && (c != '\n')) { - char echobuf[2]; - - echobuf[0] = '^'; - echobuf[1] = c ^ 0x40; - osend (echobuf, 2, tty); - tty->column += 2; - } - else { - oproc (c, tty); - } -} - -/* - * Erase a character or line - * FIXME: Needs support for WERASE and ECHOPRT. - * FIXME: Some of the tests should check for IEXTEN, too. - */ -static void -erase (struct rtems_termios_tty *tty, int lineFlag) -{ - if (tty->ccount == 0) - return; - if (lineFlag) { - if (!(tty->termios.c_lflag & ECHO)) { - tty->ccount = 0; - return; - } - if (!(tty->termios.c_lflag & ECHOE)) { - tty->ccount = 0; - echo (tty->termios.c_cc[VKILL], tty); - if (tty->termios.c_lflag & ECHOK) - echo ('\n', tty); - return; - } - } - while (tty->ccount) { - unsigned char c = tty->cbuf[--tty->ccount]; - - if (tty->termios.c_lflag & ECHO) { - if (!lineFlag && !(tty->termios.c_lflag & ECHOE)) { - echo (tty->termios.c_cc[VERASE], tty); - } - else if (c == '\t') { - int col = tty->read_start_column; - int i = 0; - - /* - * Find the character before the tab - */ - while (i != tty->ccount) { - c = tty->cbuf[i++]; - if (c == '\t') { - col = (col | 7) + 1; - } - else if (iscntrl (c)) { - if (tty->termios.c_lflag & ECHOCTL) - col += 2; - } - else { - col++; - } - } - - /* - * Back up over the tab - */ - while (tty->column > col) { - osend ("\b", 1, tty); - tty->column--; - } - } - else { - if (iscntrl (c) && (tty->termios.c_lflag & ECHOCTL)) { - osend ("\b \b", 3, tty); - if (tty->column) - tty->column--; - } - if (!iscntrl (c) || (tty->termios.c_lflag & ECHOCTL)) { - osend ("\b \b", 3, tty); - if (tty->column) - tty->column--; - } - } - } - if (!lineFlag) - break; - } -} - -/* - * Process a single input character - */ -static int -iproc (unsigned char c, struct rtems_termios_tty *tty) -{ - if (tty->termios.c_iflag & ISTRIP) - c &= 0x7f; - if (tty->termios.c_iflag & IUCLC) - c = tolower (c); - if (c == '\r') { - if (tty->termios.c_iflag & IGNCR) - return 0; - if (tty->termios.c_iflag & ICRNL) - c = '\n'; - } - else if ((c == '\n') && (tty->termios.c_iflag & INLCR)) { - c = '\r'; - } - if ((c != '\0') && (tty->termios.c_lflag & ICANON)) { - if (c == tty->termios.c_cc[VERASE]) { - erase (tty, 0); - return 0; - } - else if (c == tty->termios.c_cc[VKILL]) { - erase (tty, 1); - return 0; - } - else if (c == tty->termios.c_cc[VEOF]) { - return 1; - } - else if (c == '\n') { - if (tty->termios.c_lflag & (ECHO | ECHONL)) - echo (c, tty); - tty->cbuf[tty->ccount++] = c; - return 1; - } - else if ((c == tty->termios.c_cc[VEOL]) - || (c == tty->termios.c_cc[VEOL2])) { - if (tty->termios.c_lflag & ECHO) - echo (c, tty); - tty->cbuf[tty->ccount++] = c; - return 1; - } - } - - /* - * FIXME: Should do IMAXBEL handling somehow - */ - if (tty->ccount < (CBUFSIZE-1)) { - if (tty->termios.c_lflag & ECHO) - echo (c, tty); - tty->cbuf[tty->ccount++] = c; - } - return 0; -} - -/* - * Process input character, with semaphore. - */ -static int -siproc (unsigned char c, struct rtems_termios_tty *tty) -{ - int i; - - /* - * Obtain output semaphore if character will be echoed - */ - if (tty->termios.c_lflag & (ECHO|ECHOE|ECHOK|ECHONL|ECHOPRT|ECHOCTL|ECHOKE)) { - rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - i = iproc (c, tty); - rtems_semaphore_release (tty->osem); - } - else { - i = iproc (c, tty); - } - return i; -} - -/* - * Fill the input buffer by polling the device - */ -static rtems_status_code -fillBufferPoll (struct rtems_termios_tty *tty) -{ - int n; - - if (tty->termios.c_lflag & ICANON) { - for (;;) { - n = (*tty->device.pollRead)(tty->minor); - if (n < 0) { - rtems_task_wake_after (1); - } - else { - if (siproc (n, tty)) - break; - } - } - } - else { - rtems_interval then, now; - if (!tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) - rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); - for (;;) { - n = (*tty->device.pollRead)(tty->minor); - if (n < 0) { - if (tty->termios.c_cc[VMIN]) { - if (tty->termios.c_cc[VTIME] && tty->ccount) { - rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); - if ((now - then) > tty->vtimeTicks) { - break; - } - } - } - else { - if (!tty->termios.c_cc[VTIME]) - break; - rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); - if ((now - then) > tty->vtimeTicks) { - break; - } - } - rtems_task_wake_after (1); - } - else { - siproc (n, tty); - if (tty->ccount >= tty->termios.c_cc[VMIN]) - break; - if (tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) - rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); - } - } - } - return RTEMS_SUCCESSFUL; -} - -/* - * Fill the input buffer from the raw input queue - */ -static rtems_status_code -fillBufferQueue (struct rtems_termios_tty *tty) -{ - rtems_interval timeout = tty->rawInBufSemaphoreFirstTimeout; - rtems_status_code sc; - - for (;;) { - /* - * Process characters read from raw queue - */ - while (tty->rawInBufHead != tty->rawInBufTail) { - unsigned char c; - unsigned int newHead; - - newHead = (tty->rawInBufHead + 1) % RAW_INPUT_BUFFER_SIZE; - c = tty->rawInBuf[newHead]; - tty->rawInBufHead = newHead; - if (tty->termios.c_lflag & ICANON) { - if (siproc (c, tty)) - return RTEMS_SUCCESSFUL; - } - else { - siproc (c, tty); - if (tty->ccount >= tty->termios.c_cc[VMIN]) - return RTEMS_SUCCESSFUL; - } - timeout = tty->rawInBufSemaphoreTimeout; - } - - /* - * Wait for characters - */ - sc = rtems_semaphore_obtain (tty->rawInBufSemaphore, - tty->rawInBufSemaphoreOptions, - timeout); - if (sc != RTEMS_SUCCESSFUL) - break; - } - return RTEMS_SUCCESSFUL; -} - -rtems_status_code -rtems_termios_read (void *arg) -{ - rtems_libio_rw_args_t *args = arg; - struct rtems_termios_tty *tty = args->iop->data1; - unsigned32 count = args->count; - unsigned8 *buffer = args->buffer; - rtems_status_code sc; - - sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); - if (sc != RTEMS_SUCCESSFUL) - return sc; - if (tty->cindex == tty->ccount) { - tty->cindex = tty->ccount = 0; - tty->read_start_column = tty->column; - if (tty->device.pollRead) - sc = fillBufferPoll (tty); - else - sc = fillBufferQueue (tty); - if (sc != RTEMS_SUCCESSFUL) - tty->cindex = tty->ccount = 0; - } - while (count && (tty->cindex < tty->ccount)) { - *buffer++ = tty->cbuf[tty->cindex++]; - count--; - } - args->bytes_moved = args->count - count; - rtems_semaphore_release (tty->isem); - return sc; -} - -/* - * Place characters on raw queue. - * NOTE: This routine runs in the context of the - * device receive interrupt handler. - * Returns the number of characters dropped because of overlow. - */ -int -rtems_termios_enqueue_raw_characters (void *ttyp, char *buf, int len) -{ - struct rtems_termios_tty *tty = ttyp; - unsigned int newTail; - - while (len) { - newTail = (tty->rawInBufTail + 1) % RAW_INPUT_BUFFER_SIZE; - if (newTail == tty->rawInBufHead) { - tty->rawInBufDropped += len; - break; - } - tty->rawInBuf[newTail] = *buf++; - len--; - tty->rawInBufTail = newTail; - } - rtems_semaphore_release (tty->rawInBufSemaphore); - return len; -} - -/* - * Characters have been transmitted - * NOTE: This routine runs in the context of the - * device transmit interrupt handler. - * The second argument is the number of characters transmitted so far. - * This value will always be 1 for devices which generate an interrupt - * for each transmitted character. - * It returns number of characters left to transmit - */ -int -rtems_termios_dequeue_characters (void *ttyp, int len) -{ - struct rtems_termios_tty *tty = ttyp; - unsigned int newTail; - int nToSend; - - if (tty->rawOutBufState == rob_wait) - rtems_semaphore_release (tty->rawOutBufSemaphore); - if ( tty->rawOutBufHead == tty->rawOutBufTail ) - return 0; - newTail = (tty->rawOutBufTail + len) % RAW_OUTPUT_BUFFER_SIZE; - if (newTail == tty->rawOutBufHead) { - /* - * Buffer empty - */ - tty->rawOutBufState = rob_idle; - nToSend = 0; - } - else { - /* - * Buffer not empty, start tranmitter - */ - if (newTail > tty->rawOutBufHead) - nToSend = RAW_OUTPUT_BUFFER_SIZE - newTail; - else - nToSend = tty->rawOutBufHead - newTail; - (*tty->device.write)(tty->minor, (char *)&tty->rawOutBuf[newTail], nToSend); - tty->rawOutBufState = rob_busy; - } - tty->rawOutBufTail = newTail; - - return nToSend; -} - - |