[55e1322] | 1 | /* |
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| 2 | * TERMIOS serial line support |
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| 3 | * |
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[d24ceb3] | 4 | * Author: |
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[55e1322] | 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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[d24ceb3] | 33 | * The sizes of the raw message buffers. |
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| 34 | * On most architectures it is quite a bit more |
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| 35 | * efficient if these are powers of two. |
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[118a812] | 36 | */ |
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[d24ceb3] | 37 | #define RAW_INPUT_BUFFER_SIZE 128 |
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| 38 | #define RAW_OUTPUT_BUFFER_SIZE 64 |
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[55e1322] | 39 | |
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| 40 | /* |
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| 41 | * Variables associated with each termios instance. |
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| 42 | * One structure for each hardware I/O device. |
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| 43 | */ |
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| 44 | struct rtems_termios_tty { |
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[118a812] | 45 | /* |
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| 46 | * Linked-list of active TERMIOS devices |
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| 47 | */ |
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| 48 | struct rtems_termios_tty *forw; |
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| 49 | struct rtems_termios_tty *back; |
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| 50 | |
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| 51 | /* |
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| 52 | * How many times has this device been opened |
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| 53 | */ |
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| 54 | int refcount; |
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| 55 | |
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| 56 | /* |
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| 57 | * This device |
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| 58 | */ |
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| 59 | rtems_device_major_number major; |
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| 60 | rtems_device_major_number minor; |
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| 61 | |
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| 62 | /* |
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| 63 | * Mutual-exclusion semaphores |
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| 64 | */ |
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| 65 | rtems_id isem; |
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| 66 | rtems_id osem; |
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| 67 | |
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| 68 | /* |
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| 69 | * The canonical (cooked) character buffer |
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| 70 | */ |
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| 71 | char cbuf[CBUFSIZE]; |
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| 72 | int ccount; |
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| 73 | int cindex; |
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| 74 | |
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| 75 | /* |
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| 76 | * Keep track of cursor (printhead) position |
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| 77 | */ |
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| 78 | int column; |
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| 79 | int read_start_column; |
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| 80 | |
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| 81 | /* |
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| 82 | * The ioctl settings |
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| 83 | */ |
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| 84 | struct termios termios; |
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| 85 | rtems_interval vtimeTicks; |
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| 86 | |
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| 87 | /* |
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[d24ceb3] | 88 | * Raw input character buffer |
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| 89 | */ |
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| 90 | volatile char rawInBuf[RAW_INPUT_BUFFER_SIZE]; |
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| 91 | volatile unsigned int rawInBufHead; |
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| 92 | volatile unsigned int rawInBufTail; |
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| 93 | rtems_id rawInBufSemaphore; |
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| 94 | rtems_unsigned32 rawInBufSemaphoreOptions; |
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| 95 | rtems_interval rawInBufSemaphoreTimeout; |
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| 96 | rtems_interval rawInBufSemaphoreFirstTimeout; |
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| 97 | unsigned int rawInBufDropped; /* Statistics */ |
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| 98 | |
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| 99 | /* |
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| 100 | * Raw output character buffer |
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[118a812] | 101 | */ |
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[d24ceb3] | 102 | volatile char rawOutBuf[RAW_OUTPUT_BUFFER_SIZE]; |
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| 103 | volatile unsigned int rawOutBufHead; |
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| 104 | volatile unsigned int rawOutBufTail; |
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| 105 | rtems_id rawOutBufSemaphore; |
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| 106 | enum {rob_idle, rob_busy, rob_wait } rawOutBufState; |
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[118a812] | 107 | |
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| 108 | /* |
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| 109 | * Callbacks to device-specific routines |
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| 110 | */ |
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[161e1b3f] | 111 | rtems_termios_callbacks device; |
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[55e1322] | 112 | }; |
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[4dc0fd6] | 113 | |
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[55e1322] | 114 | static struct rtems_termios_tty *ttyHead, *ttyTail; |
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| 115 | static rtems_id ttyMutex; |
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| 116 | |
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[d24ceb3] | 117 | /* |
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| 118 | * Reserve enough resources to open every physical device once. |
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| 119 | */ |
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[2872e0b] | 120 | |
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| 121 | static int first_time; /* assumed to be zeroed by BSS initialization */ |
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| 122 | |
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[d24ceb3] | 123 | void |
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| 124 | rtems_termios_reserve_resources ( |
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| 125 | rtems_configuration_table *configuration, |
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| 126 | rtems_unsigned32 number_of_devices |
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| 127 | ) |
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| 128 | { |
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| 129 | rtems_api_configuration_table *rtems_config; |
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| 130 | |
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| 131 | if (!configuration) |
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| 132 | rtems_fatal_error_occurred (0xFFF0F001); |
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| 133 | rtems_config = configuration->RTEMS_api_configuration; |
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| 134 | if (!rtems_config) |
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| 135 | rtems_fatal_error_occurred (0xFFF0F002); |
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[2872e0b] | 136 | if (!first_time) |
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[d24ceb3] | 137 | rtems_config->maximum_semaphores += 1; |
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[2872e0b] | 138 | first_time = 1; |
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[d24ceb3] | 139 | rtems_config->maximum_semaphores += (4 * number_of_devices); |
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| 140 | } |
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| 141 | |
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[55e1322] | 142 | void |
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| 143 | rtems_termios_initialize (void) |
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| 144 | { |
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[118a812] | 145 | rtems_status_code sc; |
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| 146 | |
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| 147 | /* |
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| 148 | * Create the mutex semaphore for the tty list |
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| 149 | */ |
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| 150 | if (!ttyMutex) { |
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| 151 | sc = rtems_semaphore_create ( |
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| 152 | rtems_build_name ('T', 'R', 'm', 'i'), |
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| 153 | 1, |
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| 154 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 155 | RTEMS_NO_PRIORITY, |
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| 156 | &ttyMutex); |
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| 157 | if (sc != RTEMS_SUCCESSFUL) |
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| 158 | rtems_fatal_error_occurred (sc); |
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| 159 | } |
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[55e1322] | 160 | } |
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[118a812] | 161 | |
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[55e1322] | 162 | /* |
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| 163 | * Open a termios device |
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| 164 | */ |
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| 165 | rtems_status_code |
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| 166 | rtems_termios_open ( |
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[161e1b3f] | 167 | rtems_device_major_number major, |
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| 168 | rtems_device_minor_number minor, |
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| 169 | void *arg, |
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| 170 | const rtems_termios_callbacks *callbacks |
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[55e1322] | 171 | ) |
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| 172 | { |
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[118a812] | 173 | rtems_status_code sc; |
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| 174 | rtems_libio_open_close_args_t *args = arg; |
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| 175 | struct rtems_termios_tty *tty; |
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| 176 | |
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| 177 | /* |
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| 178 | * See if the device has already been opened |
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| 179 | */ |
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| 180 | sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 181 | if (sc != RTEMS_SUCCESSFUL) |
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| 182 | return sc; |
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| 183 | for (tty = ttyHead ; tty != NULL ; tty = tty->forw) { |
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| 184 | if ((tty->major == major) && (tty->minor == minor)) |
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| 185 | break; |
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| 186 | } |
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| 187 | if (tty == NULL) { |
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| 188 | static char c = 'a'; |
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| 189 | |
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| 190 | /* |
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| 191 | * Create a new device |
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| 192 | */ |
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| 193 | tty = malloc (sizeof (struct rtems_termios_tty)); |
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| 194 | if (tty == NULL) { |
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| 195 | rtems_semaphore_release (ttyMutex); |
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| 196 | return RTEMS_NO_MEMORY; |
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| 197 | } |
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| 198 | tty->forw = ttyHead; |
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| 199 | ttyHead = tty; |
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| 200 | tty->back = NULL; |
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| 201 | if (ttyTail == NULL) |
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| 202 | ttyTail = tty; |
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| 203 | |
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[3a7782b] | 204 | tty->minor = minor; |
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| 205 | tty->major = major; |
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| 206 | |
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[118a812] | 207 | /* |
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| 208 | * Set up mutex semaphores |
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| 209 | */ |
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| 210 | sc = rtems_semaphore_create ( |
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| 211 | rtems_build_name ('T', 'R', 'i', c), |
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| 212 | 1, |
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| 213 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 214 | RTEMS_NO_PRIORITY, |
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| 215 | &tty->isem); |
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| 216 | if (sc != RTEMS_SUCCESSFUL) |
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| 217 | rtems_fatal_error_occurred (sc); |
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| 218 | sc = rtems_semaphore_create ( |
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| 219 | rtems_build_name ('T', 'R', 'o', c), |
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| 220 | 1, |
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| 221 | RTEMS_BINARY_SEMAPHORE | RTEMS_INHERIT_PRIORITY | RTEMS_PRIORITY, |
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| 222 | RTEMS_NO_PRIORITY, |
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| 223 | &tty->osem); |
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| 224 | if (sc != RTEMS_SUCCESSFUL) |
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| 225 | rtems_fatal_error_occurred (sc); |
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[d24ceb3] | 226 | sc = rtems_semaphore_create ( |
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| 227 | rtems_build_name ('T', 'R', 'x', c), |
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| 228 | 0, |
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| 229 | RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY, |
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| 230 | RTEMS_NO_PRIORITY, |
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| 231 | &tty->rawOutBufSemaphore); |
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| 232 | if (sc != RTEMS_SUCCESSFUL) |
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| 233 | rtems_fatal_error_occurred (sc); |
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| 234 | tty->rawOutBufHead = 0; |
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| 235 | tty->rawOutBufTail = 0; |
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[118a812] | 236 | |
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| 237 | /* |
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| 238 | * Set callbacks |
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| 239 | */ |
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[161e1b3f] | 240 | tty->device = *callbacks; |
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| 241 | if (!tty->device.pollRead) { |
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[118a812] | 242 | sc = rtems_semaphore_create ( |
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| 243 | rtems_build_name ('T', 'R', 'r', c), |
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| 244 | 0, |
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| 245 | RTEMS_COUNTING_SEMAPHORE | RTEMS_PRIORITY, |
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| 246 | RTEMS_NO_PRIORITY, |
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[d24ceb3] | 247 | &tty->rawInBufSemaphore); |
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[118a812] | 248 | if (sc != RTEMS_SUCCESSFUL) |
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| 249 | rtems_fatal_error_occurred (sc); |
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[d24ceb3] | 250 | tty->rawInBufHead = 0; |
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| 251 | tty->rawInBufTail = 0; |
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[118a812] | 252 | } |
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| 253 | |
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| 254 | /* |
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| 255 | * Initialize variables |
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| 256 | */ |
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| 257 | tty->column = 0; |
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| 258 | tty->cindex = tty->ccount = 0; |
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| 259 | |
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| 260 | /* |
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| 261 | * Set default parameters |
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| 262 | */ |
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| 263 | tty->termios.c_iflag = BRKINT | ICRNL | IXON | IMAXBEL; |
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| 264 | tty->termios.c_oflag = OPOST | ONLCR | XTABS; |
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| 265 | tty->termios.c_cflag = B9600 | CS8 | CREAD; |
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| 266 | tty->termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOK | ECHOE | ECHOCTL; |
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| 267 | tty->termios.c_cc[VINTR] = '\003'; |
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| 268 | tty->termios.c_cc[VQUIT] = '\034'; |
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| 269 | tty->termios.c_cc[VERASE] = '\177'; |
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| 270 | tty->termios.c_cc[VKILL] = '\025'; |
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| 271 | tty->termios.c_cc[VEOF] = '\004'; |
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| 272 | tty->termios.c_cc[VEOL] = '\000'; |
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| 273 | tty->termios.c_cc[VEOL2] = '\000'; |
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| 274 | tty->termios.c_cc[VSTART] = '\021'; |
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| 275 | tty->termios.c_cc[VSTOP] = '\023'; |
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| 276 | tty->termios.c_cc[VSUSP] = '\032'; |
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| 277 | tty->termios.c_cc[VREPRINT] = '\022'; |
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| 278 | tty->termios.c_cc[VDISCARD] = '\017'; |
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| 279 | tty->termios.c_cc[VWERASE] = '\027'; |
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| 280 | tty->termios.c_cc[VLNEXT] = '\026'; |
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| 281 | |
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| 282 | /* |
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| 283 | * Device-specific open |
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| 284 | */ |
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[161e1b3f] | 285 | if (tty->device.firstOpen) |
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| 286 | (*tty->device.firstOpen)(major, minor, arg); |
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[118a812] | 287 | |
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| 288 | /* |
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| 289 | * Bump name characer |
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| 290 | */ |
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| 291 | if (c++ == 'z') |
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| 292 | c = 'a'; |
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| 293 | } |
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| 294 | tty->refcount++; |
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| 295 | args->iop->data1 = tty; |
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| 296 | rtems_semaphore_release (ttyMutex); |
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| 297 | return RTEMS_SUCCESSFUL; |
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[55e1322] | 298 | } |
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| 299 | |
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| 300 | rtems_status_code |
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| 301 | rtems_termios_close (void *arg) |
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| 302 | { |
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[118a812] | 303 | rtems_libio_open_close_args_t *args = arg; |
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| 304 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 305 | rtems_status_code sc; |
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| 306 | |
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| 307 | sc = rtems_semaphore_obtain (ttyMutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 308 | if (sc != RTEMS_SUCCESSFUL) |
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| 309 | rtems_fatal_error_occurred (sc); |
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| 310 | if (--tty->refcount == 0) { |
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[161e1b3f] | 311 | if (tty->device.lastClose) |
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| 312 | (*tty->device.lastClose)(tty->major, tty->minor, arg); |
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[118a812] | 313 | if (tty->forw == NULL) |
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| 314 | ttyTail = tty->back; |
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| 315 | else |
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| 316 | tty->forw->back = tty->back; |
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| 317 | if (tty->back == NULL) |
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| 318 | ttyHead = tty->forw; |
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| 319 | else |
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| 320 | tty->back->forw = tty->forw; |
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| 321 | rtems_semaphore_delete (tty->isem); |
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| 322 | rtems_semaphore_delete (tty->osem); |
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[d24ceb3] | 323 | rtems_semaphore_delete (tty->rawOutBufSemaphore); |
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[161e1b3f] | 324 | if (!tty->device.pollRead) |
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[d24ceb3] | 325 | rtems_semaphore_delete (tty->rawInBufSemaphore); |
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[118a812] | 326 | free (tty); |
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| 327 | } |
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| 328 | rtems_semaphore_release (ttyMutex); |
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| 329 | return RTEMS_SUCCESSFUL; |
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[55e1322] | 330 | } |
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| 331 | |
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| 332 | rtems_status_code |
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| 333 | rtems_termios_ioctl (void *arg) |
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| 334 | { |
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[118a812] | 335 | rtems_libio_ioctl_args_t *args = arg; |
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| 336 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 337 | rtems_status_code sc; |
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| 338 | |
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[d24ceb3] | 339 | args->ioctl_return = 0; |
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[118a812] | 340 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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[3a7782b] | 341 | if (sc != RTEMS_SUCCESSFUL) { |
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| 342 | args->ioctl_return = sc; |
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[118a812] | 343 | return sc; |
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[3a7782b] | 344 | } |
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[118a812] | 345 | switch (args->command) { |
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| 346 | default: |
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| 347 | sc = RTEMS_INVALID_NUMBER; |
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| 348 | break; |
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| 349 | |
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| 350 | case RTEMS_IO_GET_ATTRIBUTES: |
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| 351 | *(struct termios *)args->buffer = tty->termios; |
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| 352 | break; |
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| 353 | |
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| 354 | case RTEMS_IO_SET_ATTRIBUTES: |
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| 355 | tty->termios = *(struct termios *)args->buffer; |
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| 356 | if (tty->termios.c_lflag & ICANON) { |
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[d24ceb3] | 357 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
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| 358 | tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
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| 359 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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[118a812] | 360 | } |
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| 361 | else { |
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| 362 | rtems_interval ticksPerSecond; |
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| 363 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond); |
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| 364 | tty->vtimeTicks = tty->termios.c_cc[VTIME] * ticksPerSecond / 10; |
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| 365 | if (tty->termios.c_cc[VTIME]) { |
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[d24ceb3] | 366 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
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| 367 | tty->rawInBufSemaphoreTimeout = tty->vtimeTicks; |
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[118a812] | 368 | if (tty->termios.c_cc[VMIN]) |
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[d24ceb3] | 369 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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[118a812] | 370 | else |
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[d24ceb3] | 371 | tty->rawInBufSemaphoreFirstTimeout = tty->vtimeTicks; |
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[118a812] | 372 | } |
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| 373 | else { |
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| 374 | if (tty->termios.c_cc[VMIN]) { |
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[d24ceb3] | 375 | tty->rawInBufSemaphoreOptions = RTEMS_WAIT; |
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| 376 | tty->rawInBufSemaphoreTimeout = RTEMS_NO_TIMEOUT; |
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| 377 | tty->rawInBufSemaphoreFirstTimeout = RTEMS_NO_TIMEOUT; |
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[118a812] | 378 | } |
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| 379 | else { |
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[d24ceb3] | 380 | tty->rawInBufSemaphoreOptions = RTEMS_NO_WAIT; |
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[118a812] | 381 | } |
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| 382 | } |
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| 383 | } |
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[161e1b3f] | 384 | if (tty->device.setAttributes) |
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| 385 | (*tty->device.setAttributes)(tty->minor, &tty->termios); |
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[118a812] | 386 | break; |
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| 387 | } |
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| 388 | rtems_semaphore_release (tty->osem); |
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[3a7782b] | 389 | args->ioctl_return = sc; |
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[118a812] | 390 | return sc; |
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[55e1322] | 391 | } |
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| 392 | |
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[d24ceb3] | 393 | /* |
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| 394 | * Send characters to device-specific code |
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| 395 | */ |
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| 396 | static void |
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| 397 | osend (const char *buf, int len, struct rtems_termios_tty *tty) |
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| 398 | { |
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| 399 | unsigned int newHead; |
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| 400 | rtems_interrupt_level level; |
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| 401 | rtems_status_code sc; |
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| 402 | |
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[161e1b3f] | 403 | if (!tty->device.outputUsesInterrupts) { |
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| 404 | (*tty->device.write)(tty->minor, buf, len); |
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[d24ceb3] | 405 | return; |
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| 406 | } |
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| 407 | newHead = tty->rawOutBufHead; |
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| 408 | while (len) { |
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| 409 | /* |
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| 410 | * Performance improvement could be made here. |
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| 411 | * Copy multiple bytes to raw buffer: |
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| 412 | * if (len > 1) && (space to buffer end, or tail > 1) |
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| 413 | * ncopy = MIN (len, space to buffer end or tail) |
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| 414 | * memcpy (raw buffer, buf, ncopy) |
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| 415 | * buf += ncopy |
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| 416 | * len -= ncopy |
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| 417 | * |
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| 418 | * To minimize latency, the memcpy should be done |
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| 419 | * with interrupts enabled. |
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| 420 | */ |
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| 421 | newHead = (newHead + 1) % RAW_OUTPUT_BUFFER_SIZE; |
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| 422 | rtems_interrupt_disable (level); |
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| 423 | while (newHead == tty->rawOutBufTail) { |
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| 424 | tty->rawOutBufState = rob_wait; |
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| 425 | rtems_interrupt_enable (level); |
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| 426 | sc = rtems_semaphore_obtain (tty->rawOutBufSemaphore, |
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| 427 | RTEMS_WAIT, |
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| 428 | RTEMS_NO_TIMEOUT); |
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| 429 | if (sc != RTEMS_SUCCESSFUL) |
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| 430 | rtems_fatal_error_occurred (sc); |
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| 431 | rtems_interrupt_disable (level); |
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| 432 | } |
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| 433 | tty->rawOutBuf[tty->rawOutBufHead] = *buf++; |
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| 434 | tty->rawOutBufHead = newHead; |
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| 435 | if (tty->rawOutBufState == rob_idle) { |
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| 436 | rtems_interrupt_enable (level); |
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| 437 | tty->rawOutBufState = rob_busy; |
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[161e1b3f] | 438 | (*tty->device.write)(tty->minor, (char *)&tty->rawOutBuf[tty->rawOutBufTail], 1); |
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[d24ceb3] | 439 | } |
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| 440 | else { |
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| 441 | rtems_interrupt_enable (level); |
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| 442 | } |
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| 443 | len--; |
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| 444 | } |
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| 445 | } |
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| 446 | |
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[55e1322] | 447 | /* |
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| 448 | * Handle output processing |
---|
| 449 | */ |
---|
| 450 | static void |
---|
| 451 | oproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
| 452 | { |
---|
[118a812] | 453 | int i; |
---|
| 454 | |
---|
| 455 | if (tty->termios.c_oflag & OPOST) { |
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| 456 | switch (c) { |
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| 457 | case '\n': |
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| 458 | if (tty->termios.c_oflag & ONLRET) |
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| 459 | tty->column = 0; |
---|
| 460 | if (tty->termios.c_oflag & ONLCR) { |
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[d24ceb3] | 461 | osend ("\r", 1, tty); |
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[118a812] | 462 | tty->column = 0; |
---|
| 463 | } |
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| 464 | break; |
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| 465 | |
---|
| 466 | case '\r': |
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| 467 | if ((tty->termios.c_oflag & ONOCR) && (tty->column == 0)) |
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| 468 | return; |
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| 469 | if (tty->termios.c_oflag & OCRNL) { |
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| 470 | c = '\n'; |
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| 471 | if (tty->termios.c_oflag & ONLRET) |
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| 472 | tty->column = 0; |
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| 473 | break; |
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| 474 | } |
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| 475 | tty->column = 0; |
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| 476 | break; |
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| 477 | |
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| 478 | case '\t': |
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| 479 | i = 8 - (tty->column & 7); |
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| 480 | if ((tty->termios.c_oflag & TABDLY) == XTABS) { |
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| 481 | tty->column += i; |
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[d24ceb3] | 482 | osend ( " ", i, tty); |
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[118a812] | 483 | return; |
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| 484 | } |
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| 485 | tty->column += i; |
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| 486 | break; |
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| 487 | |
---|
| 488 | case '\b': |
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| 489 | if (tty->column > 0) |
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| 490 | tty->column--; |
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| 491 | break; |
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| 492 | |
---|
| 493 | default: |
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| 494 | if (tty->termios.c_oflag & OLCUC) |
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| 495 | c = toupper(c); |
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| 496 | if (!iscntrl(c)) |
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| 497 | tty->column++; |
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| 498 | break; |
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| 499 | } |
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| 500 | } |
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[d24ceb3] | 501 | osend (&c, 1, tty); |
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[55e1322] | 502 | } |
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| 503 | |
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| 504 | rtems_status_code |
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| 505 | rtems_termios_write (void *arg) |
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| 506 | { |
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[118a812] | 507 | rtems_libio_rw_args_t *args = arg; |
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| 508 | struct rtems_termios_tty *tty = args->iop->data1; |
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| 509 | rtems_status_code sc; |
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| 510 | |
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| 511 | sc = rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 512 | if (sc != RTEMS_SUCCESSFUL) |
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| 513 | return sc; |
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| 514 | if (tty->termios.c_oflag & OPOST) { |
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| 515 | unsigned32 count = args->count; |
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| 516 | unsigned8 *buffer = args->buffer; |
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| 517 | while (count--) |
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| 518 | oproc (*buffer++, tty); |
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| 519 | args->bytes_moved = args->count; |
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| 520 | } |
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| 521 | else { |
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[d24ceb3] | 522 | osend (args->buffer, args->count, tty); |
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| 523 | args->bytes_moved = args->count; |
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[118a812] | 524 | } |
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| 525 | rtems_semaphore_release (tty->osem); |
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| 526 | return sc; |
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[55e1322] | 527 | } |
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| 528 | |
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| 529 | /* |
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| 530 | * Echo a typed character |
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| 531 | */ |
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| 532 | static void |
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| 533 | echo (unsigned char c, struct rtems_termios_tty *tty) |
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| 534 | { |
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[118a812] | 535 | if ((tty->termios.c_lflag & ECHOCTL) && iscntrl(c) && (c != '\t') && (c != '\n')) { |
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| 536 | char echobuf[2]; |
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| 537 | |
---|
| 538 | echobuf[0] = '^'; |
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| 539 | echobuf[1] = c ^ 0x40; |
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[d24ceb3] | 540 | osend (echobuf, 2, tty); |
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[118a812] | 541 | tty->column += 2; |
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| 542 | } |
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| 543 | else { |
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| 544 | oproc (c, tty); |
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| 545 | } |
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[55e1322] | 546 | } |
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| 547 | |
---|
| 548 | /* |
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| 549 | * Erase a character or line |
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| 550 | * FIXME: Needs support for WERASE and ECHOPRT. |
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| 551 | * FIXME: Some of the tests should check for IEXTEN, too. |
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| 552 | */ |
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| 553 | static void |
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| 554 | erase (struct rtems_termios_tty *tty, int lineFlag) |
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| 555 | { |
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[118a812] | 556 | if (tty->ccount == 0) |
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| 557 | return; |
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| 558 | if (lineFlag) { |
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| 559 | if (!(tty->termios.c_lflag & ECHO)) { |
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| 560 | tty->ccount = 0; |
---|
| 561 | return; |
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| 562 | } |
---|
| 563 | if (!(tty->termios.c_lflag & ECHOE)) { |
---|
| 564 | tty->ccount = 0; |
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| 565 | echo (tty->termios.c_cc[VKILL], tty); |
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| 566 | if (tty->termios.c_lflag & ECHOK) |
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| 567 | echo ('\n', tty); |
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| 568 | return; |
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| 569 | } |
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| 570 | } |
---|
| 571 | while (tty->ccount) { |
---|
| 572 | unsigned char c = tty->cbuf[--tty->ccount]; |
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| 573 | |
---|
| 574 | if (tty->termios.c_lflag & ECHO) { |
---|
| 575 | if (!lineFlag && !(tty->termios.c_lflag & ECHOE)) { |
---|
| 576 | echo (tty->termios.c_cc[VERASE], tty); |
---|
| 577 | } |
---|
| 578 | else if (c == '\t') { |
---|
| 579 | int col = tty->read_start_column; |
---|
| 580 | int i = 0; |
---|
| 581 | |
---|
| 582 | /* |
---|
| 583 | * Find the character before the tab |
---|
| 584 | */ |
---|
| 585 | while (i != tty->ccount) { |
---|
| 586 | c = tty->cbuf[i++]; |
---|
| 587 | if (c == '\t') { |
---|
| 588 | col = (col | 7) + 1; |
---|
| 589 | } |
---|
| 590 | else if (iscntrl (c)) { |
---|
| 591 | if (tty->termios.c_lflag & ECHOCTL) |
---|
| 592 | col += 2; |
---|
| 593 | } |
---|
| 594 | else { |
---|
| 595 | col++; |
---|
| 596 | } |
---|
| 597 | } |
---|
| 598 | |
---|
| 599 | /* |
---|
| 600 | * Back up over the tab |
---|
| 601 | */ |
---|
| 602 | while (tty->column > col) { |
---|
[d24ceb3] | 603 | osend ("\b", 1, tty); |
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[118a812] | 604 | tty->column--; |
---|
| 605 | } |
---|
| 606 | } |
---|
| 607 | else { |
---|
| 608 | if (iscntrl (c) && (tty->termios.c_lflag & ECHOCTL)) { |
---|
[d24ceb3] | 609 | osend ("\b \b", 3, tty); |
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[118a812] | 610 | if (tty->column) |
---|
| 611 | tty->column--; |
---|
| 612 | } |
---|
| 613 | if (!iscntrl (c) || (tty->termios.c_lflag & ECHOCTL)) { |
---|
[d24ceb3] | 614 | osend ("\b \b", 3, tty); |
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[118a812] | 615 | if (tty->column) |
---|
| 616 | tty->column--; |
---|
| 617 | } |
---|
| 618 | } |
---|
| 619 | } |
---|
| 620 | if (!lineFlag) |
---|
| 621 | break; |
---|
| 622 | } |
---|
[55e1322] | 623 | } |
---|
| 624 | |
---|
| 625 | /* |
---|
| 626 | * Process a single input character |
---|
| 627 | */ |
---|
| 628 | static int |
---|
| 629 | iproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
| 630 | { |
---|
[118a812] | 631 | if (tty->termios.c_iflag & ISTRIP) |
---|
| 632 | c &= 0x7f; |
---|
| 633 | if (tty->termios.c_iflag & IUCLC) |
---|
| 634 | c = tolower (c); |
---|
| 635 | if (c == '\r') { |
---|
| 636 | if (tty->termios.c_iflag & IGNCR) |
---|
| 637 | return 0; |
---|
| 638 | if (tty->termios.c_iflag & ICRNL) |
---|
| 639 | c = '\n'; |
---|
| 640 | } |
---|
| 641 | else if ((c == '\n') && (tty->termios.c_iflag & INLCR)) { |
---|
| 642 | c = '\r'; |
---|
| 643 | } |
---|
| 644 | if ((c != '\0') && (tty->termios.c_lflag & ICANON)) { |
---|
| 645 | if (c == tty->termios.c_cc[VERASE]) { |
---|
| 646 | erase (tty, 0); |
---|
| 647 | return 0; |
---|
| 648 | } |
---|
| 649 | else if (c == tty->termios.c_cc[VKILL]) { |
---|
| 650 | erase (tty, 1); |
---|
| 651 | return 0; |
---|
| 652 | } |
---|
| 653 | else if (c == tty->termios.c_cc[VEOF]) { |
---|
| 654 | return 1; |
---|
| 655 | } |
---|
| 656 | else if (c == '\n') { |
---|
| 657 | if (tty->termios.c_lflag & (ECHO | ECHONL)) |
---|
| 658 | echo (c, tty); |
---|
| 659 | tty->cbuf[tty->ccount++] = c; |
---|
| 660 | return 1; |
---|
| 661 | } |
---|
| 662 | else if ((c == tty->termios.c_cc[VEOL]) |
---|
| 663 | || (c == tty->termios.c_cc[VEOL2])) { |
---|
| 664 | if (tty->termios.c_lflag & ECHO) |
---|
| 665 | echo (c, tty); |
---|
| 666 | tty->cbuf[tty->ccount++] = c; |
---|
| 667 | return 1; |
---|
| 668 | } |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | /* |
---|
| 672 | * FIXME: Should do IMAXBEL handling somehow |
---|
| 673 | */ |
---|
| 674 | if (tty->ccount < (CBUFSIZE-1)) { |
---|
| 675 | if (tty->termios.c_lflag & ECHO) |
---|
| 676 | echo (c, tty); |
---|
| 677 | tty->cbuf[tty->ccount++] = c; |
---|
| 678 | } |
---|
| 679 | return 0; |
---|
[55e1322] | 680 | } |
---|
| 681 | |
---|
| 682 | /* |
---|
| 683 | * Process input character, with semaphore. |
---|
| 684 | */ |
---|
| 685 | static int |
---|
| 686 | siproc (unsigned char c, struct rtems_termios_tty *tty) |
---|
| 687 | { |
---|
[118a812] | 688 | int i; |
---|
| 689 | |
---|
| 690 | /* |
---|
| 691 | * Obtain output semaphore if character will be echoed |
---|
| 692 | */ |
---|
| 693 | if (tty->termios.c_lflag & (ECHO|ECHOE|ECHOK|ECHONL|ECHOPRT|ECHOCTL|ECHOKE)) { |
---|
| 694 | rtems_semaphore_obtain (tty->osem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
| 695 | i = iproc (c, tty); |
---|
| 696 | rtems_semaphore_release (tty->osem); |
---|
| 697 | } |
---|
| 698 | else { |
---|
| 699 | i = iproc (c, tty); |
---|
| 700 | } |
---|
| 701 | return i; |
---|
[55e1322] | 702 | } |
---|
| 703 | |
---|
| 704 | /* |
---|
| 705 | * Fill the input buffer by polling the device |
---|
| 706 | */ |
---|
| 707 | static rtems_status_code |
---|
| 708 | fillBufferPoll (struct rtems_termios_tty *tty) |
---|
| 709 | { |
---|
[118a812] | 710 | int n; |
---|
| 711 | |
---|
| 712 | if (tty->termios.c_lflag & ICANON) { |
---|
| 713 | for (;;) { |
---|
[161e1b3f] | 714 | n = (*tty->device.pollRead)(tty->minor); |
---|
[118a812] | 715 | if (n < 0) { |
---|
| 716 | rtems_task_wake_after (1); |
---|
| 717 | } |
---|
| 718 | else { |
---|
[51eb8d5] | 719 | if (siproc (n, tty)) |
---|
[118a812] | 720 | break; |
---|
| 721 | } |
---|
| 722 | } |
---|
| 723 | } |
---|
| 724 | else { |
---|
| 725 | rtems_interval then, now; |
---|
| 726 | if (!tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) |
---|
| 727 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); |
---|
| 728 | for (;;) { |
---|
[161e1b3f] | 729 | n = (*tty->device.pollRead)(tty->minor); |
---|
[118a812] | 730 | if (n < 0) { |
---|
| 731 | if (tty->termios.c_cc[VMIN]) { |
---|
| 732 | if (tty->termios.c_cc[VTIME] && tty->ccount) { |
---|
| 733 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); |
---|
| 734 | if ((now - then) > tty->vtimeTicks) { |
---|
| 735 | break; |
---|
| 736 | } |
---|
| 737 | } |
---|
| 738 | } |
---|
| 739 | else { |
---|
| 740 | if (!tty->termios.c_cc[VTIME]) |
---|
| 741 | break; |
---|
| 742 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now); |
---|
| 743 | if ((now - then) > tty->vtimeTicks) { |
---|
| 744 | break; |
---|
| 745 | } |
---|
| 746 | } |
---|
| 747 | rtems_task_wake_after (1); |
---|
| 748 | } |
---|
| 749 | else { |
---|
[51eb8d5] | 750 | siproc (n, tty); |
---|
[118a812] | 751 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
| 752 | break; |
---|
| 753 | if (tty->termios.c_cc[VMIN] && tty->termios.c_cc[VTIME]) |
---|
| 754 | rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &then); |
---|
| 755 | } |
---|
| 756 | } |
---|
| 757 | } |
---|
| 758 | return RTEMS_SUCCESSFUL; |
---|
[55e1322] | 759 | } |
---|
| 760 | |
---|
| 761 | /* |
---|
| 762 | * Fill the input buffer from the raw input queue |
---|
| 763 | */ |
---|
| 764 | static rtems_status_code |
---|
| 765 | fillBufferQueue (struct rtems_termios_tty *tty) |
---|
| 766 | { |
---|
[d24ceb3] | 767 | rtems_interval timeout = tty->rawInBufSemaphoreFirstTimeout; |
---|
[118a812] | 768 | rtems_status_code sc; |
---|
| 769 | |
---|
| 770 | for (;;) { |
---|
| 771 | /* |
---|
| 772 | * Process characters read from raw queue |
---|
| 773 | */ |
---|
[d24ceb3] | 774 | while (tty->rawInBufHead != tty->rawInBufTail) { |
---|
[118a812] | 775 | unsigned char c; |
---|
| 776 | unsigned int newHead; |
---|
| 777 | |
---|
[d24ceb3] | 778 | newHead = (tty->rawInBufHead + 1) % RAW_INPUT_BUFFER_SIZE; |
---|
| 779 | c = tty->rawInBuf[newHead]; |
---|
| 780 | tty->rawInBufHead = newHead; |
---|
[118a812] | 781 | if (tty->termios.c_lflag & ICANON) { |
---|
| 782 | if (siproc (c, tty)) |
---|
| 783 | return RTEMS_SUCCESSFUL; |
---|
| 784 | } |
---|
| 785 | else { |
---|
| 786 | siproc (c, tty); |
---|
| 787 | if (tty->ccount >= tty->termios.c_cc[VMIN]) |
---|
| 788 | return RTEMS_SUCCESSFUL; |
---|
| 789 | } |
---|
[d24ceb3] | 790 | timeout = tty->rawInBufSemaphoreTimeout; |
---|
[118a812] | 791 | } |
---|
| 792 | |
---|
| 793 | /* |
---|
| 794 | * Wait for characters |
---|
| 795 | */ |
---|
[d24ceb3] | 796 | sc = rtems_semaphore_obtain (tty->rawInBufSemaphore, |
---|
| 797 | tty->rawInBufSemaphoreOptions, |
---|
[118a812] | 798 | timeout); |
---|
| 799 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 800 | break; |
---|
| 801 | } |
---|
| 802 | return RTEMS_SUCCESSFUL; |
---|
[55e1322] | 803 | } |
---|
| 804 | |
---|
| 805 | rtems_status_code |
---|
| 806 | rtems_termios_read (void *arg) |
---|
| 807 | { |
---|
[118a812] | 808 | rtems_libio_rw_args_t *args = arg; |
---|
| 809 | struct rtems_termios_tty *tty = args->iop->data1; |
---|
| 810 | unsigned32 count = args->count; |
---|
| 811 | unsigned8 *buffer = args->buffer; |
---|
| 812 | rtems_status_code sc; |
---|
| 813 | |
---|
| 814 | sc = rtems_semaphore_obtain (tty->isem, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
---|
| 815 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 816 | return sc; |
---|
| 817 | if (tty->cindex == tty->ccount) { |
---|
| 818 | tty->cindex = tty->ccount = 0; |
---|
| 819 | tty->read_start_column = tty->column; |
---|
[161e1b3f] | 820 | if (tty->device.pollRead) |
---|
[118a812] | 821 | sc = fillBufferPoll (tty); |
---|
| 822 | else |
---|
| 823 | sc = fillBufferQueue (tty); |
---|
| 824 | if (sc != RTEMS_SUCCESSFUL) |
---|
| 825 | tty->cindex = tty->ccount = 0; |
---|
| 826 | } |
---|
| 827 | while (count && (tty->cindex < tty->ccount)) { |
---|
| 828 | *buffer++ = tty->cbuf[tty->cindex++]; |
---|
| 829 | count--; |
---|
| 830 | } |
---|
| 831 | args->bytes_moved = args->count - count; |
---|
| 832 | rtems_semaphore_release (tty->isem); |
---|
| 833 | return sc; |
---|
[55e1322] | 834 | } |
---|
| 835 | |
---|
| 836 | /* |
---|
| 837 | * Place characters on raw queue. |
---|
[d24ceb3] | 838 | * NOTE: This routine runs in the context of the |
---|
| 839 | * device receive interrupt handler. |
---|
[55e1322] | 840 | */ |
---|
| 841 | void |
---|
| 842 | rtems_termios_enqueue_raw_characters (void *ttyp, char *buf, int len) |
---|
| 843 | { |
---|
[118a812] | 844 | struct rtems_termios_tty *tty = ttyp; |
---|
| 845 | unsigned int newTail; |
---|
| 846 | |
---|
| 847 | while (len) { |
---|
[d24ceb3] | 848 | newTail = (tty->rawInBufTail + 1) % RAW_INPUT_BUFFER_SIZE; |
---|
| 849 | if (newTail == tty->rawInBufHead) { |
---|
| 850 | tty->rawInBufDropped += len; |
---|
[118a812] | 851 | break; |
---|
| 852 | } |
---|
[d24ceb3] | 853 | tty->rawInBuf[newTail] = *buf++; |
---|
[118a812] | 854 | len--; |
---|
[d24ceb3] | 855 | tty->rawInBufTail = newTail; |
---|
[118a812] | 856 | } |
---|
[d24ceb3] | 857 | rtems_semaphore_release (tty->rawInBufSemaphore); |
---|
[55e1322] | 858 | } |
---|
| 859 | |
---|
[118a812] | 860 | /* |
---|
[d24ceb3] | 861 | * Characters have been transmitted |
---|
| 862 | * NOTE: This routine runs in the context of the |
---|
| 863 | * device transmit interrupt handler. |
---|
| 864 | * The second argument is the number of characters transmitted so far. |
---|
| 865 | * This value will always be 1 for devices which generate an interrupt |
---|
| 866 | * for each transmitted character. |
---|
[118a812] | 867 | */ |
---|
[d24ceb3] | 868 | void |
---|
| 869 | rtems_termios_dequeue_characters (void *ttyp, int len) |
---|
[118a812] | 870 | { |
---|
[d24ceb3] | 871 | struct rtems_termios_tty *tty = ttyp; |
---|
| 872 | unsigned int newTail; |
---|
| 873 | int nToSend; |
---|
[118a812] | 874 | |
---|
[d24ceb3] | 875 | if (tty->rawOutBufState == rob_wait) |
---|
| 876 | rtems_semaphore_release (tty->rawOutBufSemaphore); |
---|
| 877 | newTail = (tty->rawOutBufTail + len) % RAW_OUTPUT_BUFFER_SIZE; |
---|
| 878 | if (newTail == tty->rawOutBufHead) { |
---|
| 879 | /* |
---|
| 880 | * Buffer empty |
---|
| 881 | */ |
---|
| 882 | tty->rawOutBufState = rob_idle; |
---|
| 883 | } |
---|
| 884 | else { |
---|
| 885 | /* |
---|
| 886 | * Buffer not empty, start tranmitter |
---|
| 887 | */ |
---|
| 888 | tty->rawOutBufState = rob_busy; |
---|
| 889 | if (newTail > tty->rawOutBufHead) |
---|
| 890 | nToSend = RAW_OUTPUT_BUFFER_SIZE - newTail; |
---|
| 891 | else |
---|
| 892 | nToSend = tty->rawOutBufHead - newTail; |
---|
[161e1b3f] | 893 | (*tty->device.write)(tty->minor, (char *)&tty->rawOutBuf[newTail], nToSend); |
---|
[d24ceb3] | 894 | } |
---|
| 895 | tty->rawOutBufTail = newTail; |
---|
[118a812] | 896 | } |
---|