[55e1322] | 1 | /* |
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| 2 | * TERMIOS serial line support |
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| 3 | * |
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| 4 | * Author: |
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| 5 | * W. Eric Norum |
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| 6 | * Saskatchewan Accelerator Laboratory |
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| 7 | * University of Saskatchewan |
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| 8 | * Saskatoon, Saskatchewan, CANADA |
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| 9 | * eric@skatter.usask.ca |
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| 10 | * |
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| 11 | * The license and distribution terms for this file may be |
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| 12 | * found in the file LICENSE in this distribution or at |
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| 13 | * http://www.OARcorp.com/rtems/license.html. |
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| 14 | * |
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| 15 | * $Id$ |
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| 16 | */ |
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| 17 | |
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| 18 | #include <rtems.h> |
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| 19 | #include <rtems/libio.h> |
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| 20 | #include <ctype.h> |
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| 21 | #include <errno.h> |
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| 22 | #include <stdio.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <termios.h> |
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| 25 | #include <unistd.h> |
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| 26 | |
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| 27 | /* |
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| 28 | * The size of the cooked buffer |
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| 29 | */ |
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[118a812] | 30 | #define CBUFSIZE 256 |
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| 31 | |
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| 32 | /* |
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| 33 | * The size of the raw input message queue |
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| 34 | */ |
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| 35 | #define RAW_BUFFER_SIZE 128 |
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[55e1322] | 36 | |
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| 37 | /* |
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| 38 | * Variables associated with each termios instance. |
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| 39 | * One structure for each hardware I/O device. |
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| 40 | */ |
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| 41 | struct rtems_termios_tty { |
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[118a812] | 42 | /* |
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| 43 | * Linked-list of active TERMIOS devices |
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| 44 | */ |
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| 45 | struct rtems_termios_tty *forw; |
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| 46 | struct rtems_termios_tty *back; |
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| 47 | |
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| 48 | /* |
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| 49 | * How many times has this device been opened |
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| 50 | */ |
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| 51 | int refcount; |
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| 52 | |
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| 53 | /* |
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| 54 | * This device |
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| 55 | */ |
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| 56 | rtems_device_major_number major; |
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| 57 | rtems_device_major_number minor; |
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| 58 | |
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| 59 | /* |
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| 60 | * Mutual-exclusion semaphores |
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| 61 | */ |
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| 62 | rtems_id isem; |
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| 63 | rtems_id osem; |
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| 64 | |
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| 65 | /* |
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| 66 | * The canonical (cooked) character buffer |
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| 67 | */ |
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| 68 | char cbuf[CBUFSIZE]; |
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| 69 | int ccount; |
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| 70 | int cindex; |
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| 71 | |
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| 72 | /* |
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| 73 | * Keep track of cursor (printhead) position |
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| 74 | */ |
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| 75 | int column; |
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| 76 | int read_start_column; |
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| 77 | |
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| 78 | /* |
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| 79 | * The ioctl settings |
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| 80 | */ |
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| 81 | struct termios termios; |
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| 82 | rtems_interval vtimeTicks; |
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| 83 | |
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| 84 | /* |
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| 85 | * Raw character buffer |
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| 86 | */ |
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| 87 | volatile char rawBuf[RAW_BUFFER_SIZE]; |
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| 88 | volatile unsigned int rawBufHead; |
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| 89 | volatile unsigned int rawBufTail; |
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| 90 | rtems_id rawBufSemaphore; |
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| 91 | rtems_unsigned32 rawBufSemaphoreOptions; |
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| 92 | rtems_interval rawBufSemaphoreTimeout; |
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| 93 | rtems_interval rawBufSemaphoreFirstTimeout; |
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| 94 | unsigned int rawBufDropped; /* Statistics */ |
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| 95 | |
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| 96 | /* |
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| 97 | * Callbacks to device-specific routines |
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| 98 | */ |
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| 99 | int (*lastClose)(int major, int minor, void *arg); |
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| 100 | int (*read)(int minor, char *buf); |
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| 101 | int (*write)(int minor, char *buf, int len); |
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[55e1322] | 102 | }; |
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| 103 | static struct rtems_termios_tty *ttyHead, *ttyTail; |
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| 104 | static rtems_id ttyMutex; |
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| 105 | |
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| 106 | void |
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| 107 | rtems_termios_initialize (void) |
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| 108 | { |
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[118a812] | 109 | rtems_status_code sc; |
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| 110 | |
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| 111 | /* |
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| 112 | * Create the mutex semaphore for the tty list |
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| 113 | */ |
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| 114 | if (!ttyMutex) { |
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| 115 | sc = rtems_semaphore_create ( |
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| 116 | rtems_build_name ('T', 'R', 'm', 'i'), |
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| 117 | 1, |
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| 118 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 119 | RTEMS_NO_PRIORITY, |
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| 120 | &ttyMutex); |
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| 121 | if (sc != RTEMS_SUCCESSFUL) |
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| 122 | rtems_fatal_error_occurred (sc); |
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| 123 | } |
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[55e1322] | 124 | } |
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[118a812] | 125 | |
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[55e1322] | 126 | /* |
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| 127 | * Open a termios device |
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| 128 | */ |
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| 129 | rtems_status_code |
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| 130 | rtems_termios_open ( |
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| 131 | rtems_device_major_number major, |
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| 132 | rtems_device_minor_number minor, |
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| 133 | void *arg, |
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| 134 | int (*deviceFirstOpen)(int major, int minor, void *arg), |
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| 135 | int (*deviceLastClose)(int major, int minor, void *arg), |
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[118a812] | 136 | int (*deviceRead)(int minor, char *buf), |
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[55e1322] | 137 | int (*deviceWrite)(int minor, char *buf, int len) |
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| 138 | ) |
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| 139 | { |
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[118a812] | 140 | rtems_status_code sc; |
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| 141 | rtems_libio_open_close_args_t *args = arg; |
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| 142 | struct rtems_termios_tty *tty; |
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| 143 | |
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| 144 | /* |
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| 145 | * See if the device has already been opened |
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| 146 | */ |
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| 147 | sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 148 | if (sc != RTEMS_SUCCESSFUL) |
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| 149 | return sc; |
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| 150 | for (tty = ttyHead ; tty != NULL ; tty = tty->forw) { |
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| 151 | if ((tty->major == major) && (tty->minor == minor)) |
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| 152 | break; |
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| 153 | } |
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| 154 | if (tty == NULL) { |
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| 155 | static char c = 'a'; |
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| 156 | |
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| 157 | /* |
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| 158 | * Create a new device |
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| 159 | */ |
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| 160 | tty = malloc (sizeof (struct rtems_termios_tty)); |
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| 161 | if (tty == NULL) { |
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| 162 | rtems_semaphore_release (ttyMutex); |
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| 163 | return RTEMS_NO_MEMORY; |
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| 164 | } |
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| 165 | tty->forw = ttyHead; |
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| 166 | ttyHead = tty; |
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| 167 | tty->back = NULL; |
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| 168 | if (ttyTail == NULL) |
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| 169 | ttyTail = tty; |
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| 170 | |
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| 171 | /* |
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| 172 | * Set up mutex semaphores |
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| 173 | */ |
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| 174 | sc = rtems_semaphore_create ( |
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| 175 | rtems_build_name ('T', 'R', 'i', c), |
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| 176 | 1, |
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| 177 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 178 | RTEMS_NO_PRIORITY, |
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| 179 | &tty->isem); |
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| 180 | if (sc != RTEMS_SUCCESSFUL) |
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| 181 | rtems_fatal_error_occurred (sc); |
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| 182 | sc = rtems_semaphore_create ( |
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| 183 | rtems_build_name ('T', 'R', 'o', c), |
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| 184 | 1, |
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| 185 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 186 | RTEMS_NO_PRIORITY, |
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| 187 | &tty->osem); |
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| 188 | if (sc != RTEMS_SUCCESSFUL) |
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| 189 | rtems_fatal_error_occurred (sc); |
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| 190 | |
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| 191 | /* |
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| 192 | * Set callbacks |
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| 193 | */ |
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| 194 | tty->write = deviceWrite; |
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| 195 | tty->lastClose = deviceLastClose; |
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| 196 | if ((tty->read = deviceRead) == NULL) { |
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| 197 | sc = rtems_semaphore_create ( |
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| 198 | rtems_build_name ('T', 'R', 'r', c), |
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| 199 | 0, |
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| 200 | RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY, |
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| 201 | RTEMS_NO_PRIORITY, |
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| 202 | &tty->rawBufSemaphore); |
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| 203 | if (sc != RTEMS_SUCCESSFUL) |
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| 204 | rtems_fatal_error_occurred (sc); |
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| 205 | tty->rawBufHead = 0; |
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| 206 | tty->rawBufTail = 0; |
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| 207 | } |
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| 208 | |
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| 209 | /* |
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| 210 | * Initialize variables |
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| 211 | */ |
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| 212 | tty->column = 0; |
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| 213 | tty->cindex = tty->ccount = 0; |
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| 214 | |
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| 215 | /* |
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| 216 | * Set default parameters |
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| 217 | */ |
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| 218 | tty->termios.c_iflag = BRKINT | ICRNL | IXON | IMAXBEL; |
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| 219 | tty->termios.c_oflag = OPOST | ONLCR | XTABS; |
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| 220 | tty->termios.c_cflag = B9600 | CS8 | CREAD; |
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| 221 | tty->termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOK | ECHOE | ECHOCTL; |
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| 222 | tty->termios.c_cc[VINTR] = '\003'; |
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| 223 | tty->termios.c_cc[VQUIT] = '\034'; |
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| 224 | tty->termios.c_cc[VERASE] = '\177'; |
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| 225 | tty->termios.c_cc[VKILL] = '\025'; |
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| 226 | tty->termios.c_cc[VEOF] = '\004'; |
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| 227 | tty->termios.c_cc[VEOL] = '\000'; |
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| 228 | tty->termios.c_cc[VEOL2] = '\000'; |
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| 229 | tty->termios.c_cc[VSTART] = '\021'; |
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| 230 | tty->termios.c_cc[VSTOP] = '\023'; |
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| 231 | tty->termios.c_cc[VSUSP] = '\032'; |
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| 232 | tty->termios.c_cc[VREPRINT] = '\022'; |
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| 233 | tty->termios.c_cc[VDISCARD] = '\017'; |
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| 234 | tty->termios.c_cc[VWERASE] = '\027'; |
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| 235 | tty->termios.c_cc[VLNEXT] = '\026'; |
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| 236 | |
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| 237 | /* |
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| 238 | * Device-specific open |
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| 239 | */ |
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| 240 | if (deviceFirstOpen) |
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| 241 | (*deviceFirstOpen) (major, minor, arg); |
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| 242 | |
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| 243 | /* |
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| 244 | * Bump name characer |
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| 245 | */ |
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| 246 | if (c++ == 'z') |
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| 247 | c = 'a'; |
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| 248 | } |
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| 249 | tty->refcount++; |
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| 250 | args->iop->data1 = tty; |
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| 251 | rtems_semaphore_release (ttyMutex); |
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| 252 | return RTEMS_SUCCESSFUL; |
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[55e1322] | 253 | } |
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| 254 | |
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| 255 | rtems_status_code |
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| 256 | rtems_termios_close (void *arg) |
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| 257 | { |
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[118a812] | 258 | rtems_libio_open_close_args_t *args = arg; |
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| 259 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 260 | rtems_status_code sc; |
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| 261 | |
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| 262 | sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 263 | if (sc != RTEMS_SUCCESSFUL) |
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| 264 | rtems_fatal_error_occurred (sc); |
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| 265 | if (--tty->refcount == 0) { |
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| 266 | if (tty->lastClose) |
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| 267 | (*tty->lastClose) (tty->major, tty->minor, arg); |
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| 268 | if (tty->forw == NULL) |
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| 269 | ttyTail = tty->back; |
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| 270 | else |
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| 271 | tty->forw->back = tty->back; |
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| 272 | if (tty->back == NULL) |
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| 273 | ttyHead = tty->forw; |
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| 274 | else |
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| 275 | tty->back->forw = tty->forw; |
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| 276 | rtems_semaphore_delete (tty->isem); |
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| 277 | rtems_semaphore_delete (tty->osem); |
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| 278 | if (tty->read == NULL) |
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| 279 | rtems_semaphore_delete (tty->rawBufSemaphore); |
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| 280 | free (tty); |
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| 281 | } |
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| 282 | rtems_semaphore_release (ttyMutex); |
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| 283 | return RTEMS_SUCCESSFUL; |
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[55e1322] | 284 | } |
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| 285 | |
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| 286 | rtems_status_code |
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| 287 | rtems_termios_ioctl (void *arg) |
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| 288 | { |
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[118a812] | 289 | rtems_libio_ioctl_args_t *args = arg; |
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| 290 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 291 | rtems_status_code sc; |
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| 292 | |
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| 293 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 294 | if (sc != RTEMS_SUCCESSFUL) |
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| 295 | return sc; |
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| 296 | switch (args->command) { |
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| 297 | default: |
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| 298 | sc = RTEMS_INVALID_NUMBER; |
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| 299 | break; |
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| 300 | |
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| 301 | case RTEMS_IO_GET_ATTRIBUTES: |
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| 302 | *(struct termios *)args->buffer = tty->termios; |
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| 303 | break; |
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| 304 | |
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| 305 | case RTEMS_IO_SET_ATTRIBUTES: |
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| 306 | tty->termios = *(struct termios *)args->buffer; |
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| 307 | if (tty->termios.c_lflag & ICANON) { |
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| 308 | tty->rawBufSemaphoreOptions = RTEMS_WAIT; |
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| 309 | tty->rawBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
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| 310 | tty->rawBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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| 311 | } |
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| 312 | else { |
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| 313 | rtems_interval ticksPerSecond; |
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| 314 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond); |
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| 315 | tty->vtimeTicks = tty->termios.c_cc[VTIME] * ticksPerSecond / 10; |
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| 316 | if (tty->termios.c_cc[VTIME]) { |
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| 317 | tty->rawBufSemaphoreOptions = RTEMS_WAIT; |
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| 318 | tty->rawBufSemap`oreTimeout = tty->vtimeTicks; |
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| 319 | if (tty->termios.c_cc[VMIN]) |
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| 320 | tty->rawBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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| 321 | else |
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| 322 | tty->rawBufSemaphoreFirstTimeout = tty->vtimeTicks; |
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| 323 | } |
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| 324 | else { |
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| 325 | if (tty->termios.c_cc[VMIN]) { |
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| 326 | tty->rawBufSemaphoreOptions = RTEMS_WAIT; |
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| 327 | tty->rawBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
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| 328 | tty->rawBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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| 329 | } |
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| 330 | else { |
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| 331 | tty->rawBufSemaphoreOptions = RTEMS_NO_WAIT; |
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| 332 | } |
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| 333 | } |
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| 334 | } |
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| 335 | break; |
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| 336 | } |
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| 337 | rtems_semaphore_release (tty->osem); |
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| 338 | return sc; |
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[55e1322] | 339 | } |
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| 340 | |
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| 341 | /* |
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| 342 | * Handle output processing |
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| 343 | */ |
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| 344 | static void |
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| 345 | oproc (unsigned char c, struct rtems_termios_tty *tty) |
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| 346 | { |
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[118a812] | 347 | int i; |
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| 348 | |
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| 349 | if (tty->termios.c_oflag & OPOST) { |
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| 350 | switch (c) { |
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| 351 | case '\n': |
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| 352 | if (tty->termios.c_oflag & ONLRET) |
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| 353 | tty->column = 0; |
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| 354 | if (tty->termios.c_oflag & ONLCR) { |
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| 355 | (*tty->write)(tty->minor, "\r", 1); |
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| 356 | tty->column = 0; |
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| 357 | } |
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| 358 | break; |
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| 359 | |
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| 360 | case '\r': |
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| 361 | if ((tty->termios.c_oflag & ONOCR) && (tty->column == 0)) |
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| 362 | return; |
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| 363 | if (tty->termios.c_oflag & OCRNL) { |
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| 364 | c = '\n'; |
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| 365 | if (tty->termios.c_oflag & ONLRET) |
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| 366 | tty->column = 0; |
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| 367 | break; |
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| 368 | } |
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| 369 | tty->column = 0; |
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| 370 | break; |
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| 371 | |
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| 372 | case '\t': |
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| 373 | i = 8 - (tty->column & 7); |
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| 374 | if ((tty->termios.c_oflag & TABDLY) == XTABS) { |
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| 375 | tty->column += i; |
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| 376 | (*tty->write)(tty->minor, " ", i); |
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| 377 | return; |
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| 378 | } |
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| 379 | tty->column += i; |
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| 380 | break; |
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| 381 | |
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| 382 | case '\b': |
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| 383 | if (tty->column > 0) |
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| 384 | tty->column--; |
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| 385 | break; |
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| 386 | |
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| 387 | default: |
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| 388 | if (tty->termios.c_oflag & OLCUC) |
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| 389 | c = toupper(c); |
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| 390 | if (!iscntrl(c)) |
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| 391 | tty->column++; |
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| 392 | break; |
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| 393 | } |
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| 394 | } |
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| 395 | (*tty->write)(tty->minor, &c, 1); |
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[55e1322] | 396 | } |
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| 397 | |
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| 398 | rtems_status_code |
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| 399 | rtems_termios_write (void *arg) |
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| 400 | { |
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[118a812] | 401 | rtems_libio_rw_args_t *args = arg; |
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| 402 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 403 | rtems_status_code sc; |
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| 404 | |
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| 405 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 406 | if (sc != RTEMS_SUCCESSFUL) |
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| 407 | return sc; |
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| 408 | if (tty->termios.c_oflag & OPOST) { |
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| 409 | unsigned32 count = args->count; |
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| 410 | unsigned8 *buffer = args->buffer; |
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| 411 | while (count--) |
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| 412 | oproc (*buffer++, tty); |
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| 413 | args->bytes_moved = args->count; |
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| 414 | } |
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| 415 | else { |
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| 416 | if ((*tty->write)(tty->minor, args->buffer, args->count) < 0) |
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| 417 | sc = RTEMS_UNSATISFIED; |
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| 418 | else |
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| 419 | args->bytes_moved = args->count; |
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| 420 | } |
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| 421 | rtems_semaphore_release (tty->osem); |
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| 422 | return sc; |
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[55e1322] | 423 | } |
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| 424 | |
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| 425 | /* |
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| 426 | * Echo a typed character |
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| 427 | */ |
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| 428 | static void |
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| 429 | echo (unsigned char c, struct rtems_termios_tty *tty) |
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| 430 | { |
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[118a812] | 431 | if ((tty->termios.c_lflag & ECHOCTL) && iscntrl(c) && (c != '\t') && (c != '\n')) { |
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| 432 | char echobuf[2]; |
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| 433 | |
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| 434 | echobuf[0] = '^'; |
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| 435 | echobuf[1] = c ^ 0x40; |
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| 436 | (*tty->write)(tty->minor, echobuf, 2); |
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| 437 | tty->column += 2; |
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| 438 | } |
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| 439 | else { |
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| 440 | oproc (c, tty); |
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| 441 | } |
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[55e1322] | 442 | } |
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| 443 | |
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| 444 | /* |
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| 445 | * Erase a character or line |
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| 446 | * FIXME: Needs support for WERASE and ECHOPRT. |
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| 447 | * FIXME: Some of the tests should check for IEXTEN, too. |
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| 448 | */ |
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| 449 | static void |
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| 450 | erase (struct rtems_termios_tty *tty, int lineFlag) |
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| 451 | { |
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[118a812] | 452 | if (tty->ccount == 0) |
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| 453 | return; |
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| 454 | if (lineFlag) { |
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| 455 | if (!(tty->termios.c_lflag & ECHO)) { |
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| 456 | tty->ccount = 0; |
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| 457 | return; |
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| 458 | } |
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| 459 | if (!(tty->termios.c_lflag & ECHOE)) { |
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| 460 | tty->ccount = 0; |
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| 461 | echo (tty->termios.c_cc[VKILL], tty); |
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| 462 | if (tty->termios.c_lflag & ECHOK) |
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| 463 | echo ('\n', tty); |
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| 464 | return; |
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| 465 | } |
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| 466 | } |
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| 467 | while (tty->ccount) { |
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| 468 | unsigned char c = tty->cbuf[--tty->ccount]; |
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| 469 | |
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| 470 | if (tty->termios.c_lflag & ECHO) { |
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| 471 | if (!lineFlag && !(tty->termios.c_lflag & ECHOE)) { |
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| 472 | echo (tty->termios.c_cc[VERASE], tty); |
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| 473 | } |
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| 474 | else if (c == '\t') { |
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| 475 | int col = tty->read_start_column; |
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| 476 | int i = 0; |
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| 477 | |
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| 478 | /* |
---|
| 479 | * Find the character before the tab |
---|
| 480 | */ |
---|
| 481 | while (i != tty->ccount) { |
---|
| 482 | c = tty->cbuf[i++]; |
---|
| 483 | if (c == '\t') { |
---|
| 484 | col = (col | 7) + 1; |
---|
| 485 | } |
---|
| 486 | else if (iscntrl (c)) { |
---|
| 487 | if (tty->termios.c_lflag & ECHOCTL) |
---|
| 488 | col += 2; |
---|
| 489 | } |
---|
| 490 | else { |
---|
| 491 | col++; |
---|
| 492 | } |
---|
| 493 | } |
---|
| 494 | |
---|
| 495 | /* |
---|
| 496 | * Back up over the tab |
---|
| 497 | */ |
---|
| 498 | while (tty->column > col) { |
---|
| 499 | (*tty->write)(tty->minor, "\b", 1); |
---|
| 500 | tty->column--; |
---|
| 501 | } |
---|
| 502 | } |
---|
| 503 | else { |
---|
| 504 | if (iscntrl (c) && (tty->termios.c_lflag & ECHOCTL)) { |
---|
| 505 | (*tty->write)(tty->minor, "\b \b", 3); |
---|
| 506 | if (tty->column) |
---|
| 507 | tty->column--; |
---|
| 508 | } |
---|
| 509 | if (!iscntrl (c) || (tty->termios.c_lflag & ECHOCTL)) { |
---|
| 510 | (*tty->write)(tty->minor, "\b \b", 3); |
---|
| 511 | if (tty->column) |
---|
| 512 | tty->column--; |
---|
| 513 | } |
---|
| 514 | } |
---|
| 515 | } |
---|
| 516 | if (!lineFlag) |
---|
| 517 | break; |
---|
| 518 | } |
---|
[55e1322] | 519 | } |
---|
| 520 | |
---|
| 521 | /* |
---|
| 522 | * Process a single input character |
---|
| 523 | */ |
---|
| 524 | static int |
---|
| 525 | iproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
| 526 | { |
---|
[118a812] | 527 | if (tty->termios.c_iflag & ISTRIP) |
---|
| 528 | c &= 0x7f; |
---|
| 529 | if (tty->termios.c_iflag & IUCLC) |
---|
| 530 | c = tolower (c); |
---|
| 531 | if (c == '\r') { |
---|
| 532 | if (tty->termios.c_iflag & IGNCR) |
---|
| 533 | return 0; |
---|
| 534 | if (tty->termios.c_iflag & ICRNL) |
---|
| 535 | c = '\n'; |
---|
| 536 | } |
---|
| 537 | else if ((c == '\n') && (tty->termios.c_iflag & INLCR)) { |
---|
| 538 | c = '\r'; |
---|
| 539 | } |
---|
| 540 | if ((c != '\0') && (tty->termios.c_lflag & ICANON)) { |
---|
| 541 | if (c == tty->termios.c_cc[VERASE]) { |
---|
| 542 | erase (tty, 0); |
---|
| 543 | return 0; |
---|
| 544 | } |
---|
| 545 | else if (c == tty->termios.c_cc[VKILL]) { |
---|
| 546 | erase (tty, 1); |
---|
| 547 | return 0; |
---|
| 548 | } |
---|
| 549 | else if (c == tty->termios.c_cc[VEOF]) { |
---|
| 550 | return 1; |
---|
| 551 | } |
---|
| 552 | else if (c == '\n') { |
---|
| 553 | if (tty->termios.c_lflag & (ECHO | ECHONL)) |
---|
| 554 | echo (c, tty); |
---|
| 555 | tty->cbuf[tty->ccount++] = c; |
---|
| 556 | return 1; |
---|
| 557 | } |
---|
| 558 | else if ((c == tty->termios.c_cc[VEOL]) |
---|
| 559 | || (c == tty->termios.c_cc[VEOL2])) { |
---|
| 560 | if (tty->termios.c_lflag & ECHO) |
---|
| 561 | echo (c, tty); |
---|
| 562 | tty->cbuf[tty->ccount++] = c; |
---|
| 563 | return 1; |
---|
| 564 | } |
---|
| 565 | } |
---|
| 566 | |
---|
| 567 | /* |
---|
| 568 | * FIXME: Should do IMAXBEL handling somehow |
---|
| 569 | */ |
---|
| 570 | if (tty->ccount < (CBUFSIZE-1)) { |
---|
| 571 | if (tty->termios.c_lflag & ECHO) |
---|
| 572 | echo (c, tty); |
---|
| 573 | tty->cbuf[tty->ccount++] = c; |
---|
| 574 | } |
---|
| 575 | return 0; |
---|
[55e1322] | 576 | } |
---|
| 577 | |
---|
| 578 | /* |
---|
| 579 | * Process input character, with semaphore. |
---|
| 580 | */ |
---|
| 581 | static int |
---|
| 582 | siproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
| 583 | { |
---|
[118a812] | 584 | int i; |
---|
| 585 | |
---|
| 586 | /* |
---|
| 587 | * Obtain output semaphore if character will be echoed |
---|
| 588 | */ |
---|
| 589 | if (tty->termios.c_lflag & (ECHO|ECHOE|ECHOK|ECHONL|ECHOPRT|ECHOCTL|ECHOKE)) { |
---|
| 590 | rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
| 591 | i = iproc (c, tty); |
---|
| 592 | rtems_semaphore_release (tty->osem); |
---|
| 593 | } |
---|
| 594 | else { |
---|
| 595 | i = iproc (c, tty); |
---|
| 596 | } |
---|
| 597 | return i; |
---|
[55e1322] | 598 | } |
---|
| 599 | |
---|
| 600 | /* |
---|
| 601 | * Fill the input buffer by polling the device |
---|
| 602 | */ |
---|
| 603 | static rtems_status_code |
---|
| 604 | fillBufferPoll (struct rtems_termios_tty *tty) |
---|
| 605 | { |
---|
[118a812] | 606 | unsigned char c; |
---|
| 607 | int n; |
---|
| 608 | |
---|
| 609 | if (tty->termios.c_lflag & ICANON) { |
---|
| 610 | for (;;) { |
---|
| 611 | n = (*tty->read)(tty->minor, &c); |
---|
| 612 | if (n < 0) { |
---|
| 613 | return RTEMS_UNSATISFIED; |
---|
| 614 | } |
---|
| 615 | else if (n == 0) { |
---|
| 616 | rtems_task_wake_after (1); |
---|
| 617 | } |
---|
| 618 | else { |
---|
| 619 | if (siproc (c, tty)) |
---|
| 620 | break; |
---|
| 621 | } |
---|
| 622 | } |
---|
| 623 | } |
---|
| 624 | else { |
---|
| 625 | rtems_interval then, now; |
---|
| 626 | if (!tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) |
---|
| 627 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); |
---|
| 628 | for (;;) { |
---|
| 629 | n = (*tty->read)(tty->minor, &c); |
---|
| 630 | if (n < 0) { |
---|
| 631 | return RTEMS_UNSATISFIED; |
---|
| 632 | } |
---|
| 633 | else if (n == 0) { |
---|
| 634 | if (tty->termios.c_cc[VMIN]) { |
---|
| 635 | if (tty->termios.c_cc[VTIME] && tty->ccount) { |
---|
| 636 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); |
---|
| 637 | if ((now - then) > tty->vtimeTicks) { |
---|
| 638 | break; |
---|
| 639 | } |
---|
| 640 | } |
---|
| 641 | } |
---|
| 642 | else { |
---|
| 643 | if (!tty->termios.c_cc[VTIME]) |
---|
| 644 | break; |
---|
| 645 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); |
---|
| 646 | if ((now - then) > tty->vtimeTicks) { |
---|
| 647 | break; |
---|
| 648 | } |
---|
| 649 | } |
---|
| 650 | rtems_task_wake_after (1); |
---|
| 651 | } |
---|
| 652 | else { |
---|
| 653 | siproc (c, tty); |
---|
| 654 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
| 655 | break; |
---|
| 656 | if (tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) |
---|
| 657 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); |
---|
| 658 | } |
---|
| 659 | } |
---|
| 660 | } |
---|
| 661 | return RTEMS_SUCCESSFUL; |
---|
[55e1322] | 662 | } |
---|
| 663 | |
---|
| 664 | /* |
---|
| 665 | * Fill the input buffer from the raw input queue |
---|
| 666 | */ |
---|
| 667 | static rtems_status_code |
---|
| 668 | fillBufferQueue (struct rtems_termios_tty *tty) |
---|
| 669 | { |
---|
[118a812] | 670 | rtems_interval timeout = tty->rawBufSemaphoreFirstTimeout; |
---|
| 671 | rtems_status_code sc; |
---|
| 672 | |
---|
| 673 | for (;;) { |
---|
| 674 | /* |
---|
| 675 | * Process characters read from raw queue |
---|
| 676 | */ |
---|
| 677 | while (tty->rawBufHead != tty->rawBufTail) { |
---|
| 678 | unsigned char c; |
---|
| 679 | unsigned int newHead; |
---|
| 680 | |
---|
| 681 | newHead = (tty->rawBufHead + 1) % RAW_BUFFER_SIZE; |
---|
| 682 | c = tty->rawBuf[newHead]; |
---|
| 683 | tty->rawBufHead = newHead; |
---|
| 684 | if (tty->termios.c_lflag & ICANON) { |
---|
| 685 | if (siproc (c, tty)) |
---|
| 686 | return RTEMS_SUCCESSFUL; |
---|
| 687 | } |
---|
| 688 | else { |
---|
| 689 | siproc (c, tty); |
---|
| 690 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
| 691 | return RTEMS_SUCCESSFUL; |
---|
| 692 | } |
---|
| 693 | timeout = tty->rawBufSemaphoreTimeout; |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | /* |
---|
| 697 | * Wait for characters |
---|
| 698 | */ |
---|
| 699 | sc = rtems_semaphore_obtain (tty->rawBufSemaphore, |
---|
| 700 | tty->rawBufSemaphoreOptions, |
---|
| 701 | timeout); |
---|
| 702 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 703 | break; |
---|
| 704 | } |
---|
| 705 | return RTEMS_SUCCESSFUL; |
---|
[55e1322] | 706 | } |
---|
| 707 | |
---|
| 708 | rtems_status_code |
---|
| 709 | rtems_termios_read (void *arg) |
---|
| 710 | { |
---|
[118a812] | 711 | rtems_libio_rw_args_t *args = arg; |
---|
| 712 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
| 713 | unsigned32 count = args->count; |
---|
| 714 | unsigned8 *buffer = args->buffer; |
---|
| 715 | rtems_status_code sc; |
---|
| 716 | |
---|
| 717 | sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
| 718 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 719 | return sc; |
---|
| 720 | if (tty->cindex == tty->ccount) { |
---|
| 721 | tty->cindex = tty->ccount = 0; |
---|
| 722 | tty->read_start_column = tty->column; |
---|
| 723 | if (tty->read) |
---|
| 724 | sc = fillBufferPoll (tty); |
---|
| 725 | else |
---|
| 726 | sc = fillBufferQueue (tty); |
---|
| 727 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 728 | tty->cindex = tty->ccount = 0; |
---|
| 729 | } |
---|
| 730 | while (count && (tty->cindex < tty->ccount)) { |
---|
| 731 | *buffer++ = tty->cbuf[tty->cindex++]; |
---|
| 732 | count--; |
---|
| 733 | } |
---|
| 734 | args->bytes_moved = args->count - count; |
---|
| 735 | rtems_semaphore_release (tty->isem); |
---|
| 736 | return sc; |
---|
[55e1322] | 737 | } |
---|
| 738 | |
---|
| 739 | /* |
---|
| 740 | * Place characters on raw queue. |
---|
| 741 | * NOTE: This routine runs in the context of the device interrupt handler. |
---|
| 742 | */ |
---|
| 743 | void |
---|
| 744 | rtems_termios_enqueue_raw_characters (void *ttyp, char *buf, int len) |
---|
| 745 | { |
---|
[118a812] | 746 | struct rtems_termios_tty *tty = ttyp; |
---|
| 747 | unsigned int newTail; |
---|
| 748 | |
---|
| 749 | while (len) { |
---|
| 750 | newTail = (tty->rawBufTail + 1) % RAW_BUFFER_SIZE; |
---|
| 751 | if (newTail == tty->rawBufHead) { |
---|
| 752 | tty->rawBufDropped += len; |
---|
| 753 | break; |
---|
| 754 | } |
---|
| 755 | tty->rawBuf[newTail] = *buf++; |
---|
| 756 | len--; |
---|
| 757 | tty->rawBufTail = newTail; |
---|
| 758 | } |
---|
| 759 | rtems_semaphore_release (tty->rawBufSemaphore); |
---|
[55e1322] | 760 | } |
---|
| 761 | |
---|
[118a812] | 762 | /* |
---|
[3ee825e8] | 763 | * Reserve enough resources to open every physical device once. |
---|
[118a812] | 764 | */ |
---|
| 765 | |
---|
| 766 | void rtems_termios_reserve_resources( |
---|
| 767 | rtems_configuration_table *configuration, |
---|
| 768 | rtems_unsigned32 number_of_devices |
---|
| 769 | ) |
---|
| 770 | { |
---|
| 771 | static int first_time = 1; |
---|
| 772 | rtems_api_configuration_table *rtems_config; |
---|
| 773 | |
---|
| 774 | if (!configuration) |
---|
| 775 | rtems_fatal_error_occurred (0xFFF0F001); |
---|
| 776 | |
---|
| 777 | rtems_config = configuration->RTEMS_api_configuration; |
---|
| 778 | if (!rtems_config) |
---|
| 779 | rtems_fatal_error_occurred (0xFFF0F002); |
---|
| 780 | |
---|
| 781 | if (first_time) |
---|
| 782 | rtems_config->maximum_semaphores += 1; |
---|
| 783 | |
---|
| 784 | first_time = 0; |
---|
| 785 | rtems_config->maximum_semaphores += (3 * number_of_devices); |
---|
| 786 | } |
---|