[556fb911] | 1 | /* |
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| 2 | * Tty IO Driver |
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| 3 | * This is a "libio" driver based on libc/support/generic/libio interface |
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| 4 | * which is on top of the RTEMS IO manager. |
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| 5 | * |
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| 6 | * These provide UNIX-like read and write calls for the C library. |
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| 7 | * |
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| 8 | * COPYRIGHT (c) 1994 by Division Incorporated |
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| 9 | * |
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[e71ce071] | 10 | * The license and distribution terms for this file may in |
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| 11 | * the file LICENSE in this distribution or at |
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| 12 | * http://www.OARcorp.com/rtems/license.html. |
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[556fb911] | 13 | * |
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[63edbb3f] | 14 | * $Id$ |
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[556fb911] | 15 | */ |
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| 16 | |
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| 17 | #include <bsp.h> |
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| 18 | #include <rtems/libio.h> |
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| 19 | |
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| 20 | #include <errno.h> |
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| 21 | |
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| 22 | #define PRINT_BUFFER_SIZE (16 * 1024) |
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| 23 | |
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| 24 | /* |
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| 25 | * NOTE: this structure is dumplicated in print_dump.c utility |
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| 26 | */ |
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| 27 | |
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| 28 | struct { |
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| 29 | int index; |
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| 30 | int size; |
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| 31 | char buffer[PRINT_BUFFER_SIZE]; |
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| 32 | } print_buffer; |
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| 33 | |
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| 34 | /* always use printf buffer if non-zero */ |
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| 35 | int use_print_buffer; |
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| 36 | |
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| 37 | static int host_read_syscall(int fd, char *buffer, int count); |
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| 38 | static int host_write_syscall(int fd, char *buffer, int count); |
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| 39 | |
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| 40 | rtems_device_driver |
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| 41 | tty_initialize( |
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| 42 | rtems_device_major_number major, |
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| 43 | rtems_device_minor_number minor, |
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| 44 | void * arg |
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| 45 | ) |
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| 46 | { |
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| 47 | rtems_status_code status; |
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| 48 | |
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| 49 | status = rtems_io_register_name("/dev/tty00", |
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| 50 | major, |
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| 51 | (rtems_device_minor_number) 0); |
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| 52 | if (status != RTEMS_SUCCESSFUL) |
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| 53 | rtems_fatal_error_occurred(status); |
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| 54 | |
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| 55 | return RTEMS_SUCCESSFUL; |
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| 56 | } |
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| 57 | |
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| 58 | rtems_device_driver |
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| 59 | tty_open( |
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| 60 | rtems_device_major_number major, |
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| 61 | rtems_device_minor_number minor, |
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| 62 | void * arg |
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| 63 | ) |
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| 64 | { |
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| 65 | return RTEMS_SUCCESSFUL; |
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| 66 | } |
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| 67 | |
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| 68 | rtems_device_driver |
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| 69 | tty_close( |
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| 70 | rtems_device_major_number major, |
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| 71 | rtems_device_minor_number minor, |
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| 72 | void * arg |
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| 73 | ) |
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| 74 | { |
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| 75 | return RTEMS_SUCCESSFUL; |
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| 76 | } |
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| 77 | |
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| 78 | rtems_device_driver |
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| 79 | tty_control( |
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| 80 | rtems_device_major_number major, |
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| 81 | rtems_device_minor_number minor, |
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| 82 | void * arg |
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| 83 | ) |
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| 84 | { |
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| 85 | return RTEMS_SUCCESSFUL; |
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| 86 | } |
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| 87 | |
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| 88 | |
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| 89 | rtems_device_driver |
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| 90 | tty_read( |
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| 91 | rtems_device_major_number major, |
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| 92 | rtems_device_minor_number minor, |
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| 93 | void * arg |
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| 94 | ) |
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| 95 | { |
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| 96 | rtems_libio_rw_args_t *rw_args; |
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| 97 | int count = 0; |
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| 98 | |
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| 99 | rw_args = (rtems_libio_rw_args_t *) arg; |
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| 100 | |
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| 101 | /* |
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| 102 | * If we are printing to a buffer, then just return newline on all |
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| 103 | * read's. If we return 0 bytes read, then the pause() calls in |
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| 104 | * the RTEMS tests get hosed (pause() does a gets()) |
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| 105 | */ |
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| 106 | |
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| 107 | if ( use_print_buffer ) |
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| 108 | { |
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| 109 | *rw_args->buffer = '\n'; |
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| 110 | count = 1; |
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| 111 | } |
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| 112 | else |
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| 113 | { |
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| 114 | count = host_read_syscall(0, rw_args->buffer, rw_args->count); |
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| 115 | } |
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| 116 | |
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| 117 | if (count >= 0) |
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| 118 | { |
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| 119 | rw_args->bytes_moved = count; |
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| 120 | return RTEMS_SUCCESSFUL; |
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| 121 | } |
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| 122 | return RTEMS_UNSATISFIED; |
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| 123 | } |
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| 124 | |
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| 125 | rtems_device_driver |
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| 126 | tty_write( |
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| 127 | rtems_device_major_number major, |
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| 128 | rtems_device_minor_number minor, |
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| 129 | void * arg |
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| 130 | ) |
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| 131 | { |
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| 132 | unsigned32 level; |
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| 133 | rtems_libio_rw_args_t *rw_args; |
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| 134 | int count = 0; |
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| 135 | int fd = 1; /* XXX fixme; needs to be saved in iop */ |
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| 136 | |
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| 137 | rw_args = (rtems_libio_rw_args_t *) arg; |
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| 138 | |
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| 139 | /* |
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| 140 | * HACK alert |
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| 141 | * |
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| 142 | * Some of the simulators have real problems when multi cpu and |
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| 143 | * using the system calls. Until this is fixed, if we are multi |
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| 144 | * cpu then we write to a printf buffer |
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| 145 | */ |
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| 146 | |
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| 147 | if ( use_print_buffer ) |
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| 148 | { |
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| 149 | /* save size in memory for dumper */ |
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| 150 | if (print_buffer.size == 0) |
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| 151 | print_buffer.size = PRINT_BUFFER_SIZE; |
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| 152 | |
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| 153 | while (rw_args->count-- > 0) |
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| 154 | { |
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| 155 | rtems_interrupt_disable(level); |
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| 156 | print_buffer.buffer[print_buffer.index] = *rw_args->buffer++; |
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| 157 | print_buffer.index++; |
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| 158 | print_buffer.index &= (PRINT_BUFFER_SIZE - 1); |
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| 159 | print_buffer.buffer[print_buffer.index] = 0; |
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| 160 | rtems_interrupt_enable(level); |
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| 161 | count++; |
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| 162 | } |
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| 163 | } |
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| 164 | else |
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| 165 | { |
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| 166 | #if 1 |
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| 167 | /* |
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| 168 | * if on a multi cpu system and writing to stdout, redirect to stderr |
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| 169 | * so we can keep them separate |
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| 170 | */ |
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| 171 | |
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| 172 | if ((cpu_number == 1) && (fd == 1)) |
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| 173 | fd = 2; |
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| 174 | #endif |
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| 175 | count = host_write_syscall(fd, rw_args->buffer, rw_args->count); |
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| 176 | } |
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| 177 | |
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| 178 | if (count >= 0) |
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| 179 | { |
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| 180 | rw_args->bytes_moved = count; |
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| 181 | return RTEMS_SUCCESSFUL; |
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| 182 | } |
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| 183 | return RTEMS_UNSATISFIED; |
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| 184 | } |
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| 185 | |
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| 186 | |
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| 187 | /* |
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| 188 | * Host system call hack. |
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| 189 | * This little trick gets all the args in the right registers |
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| 190 | * for the system call and permits simpler inline asm. |
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| 191 | * Since this whole thing (syscalls under simulator) is a hack, |
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| 192 | * this little bit more is not going to hurt anything. |
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| 193 | */ |
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| 194 | |
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| 195 | |
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| 196 | static int |
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| 197 | host_read_syscall( |
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| 198 | int fd, |
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| 199 | char *buffer, |
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| 200 | int count |
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| 201 | ) |
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| 202 | { |
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| 203 | unsigned32 level; |
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| 204 | int rc; |
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| 205 | |
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| 206 | rtems_interrupt_disable(level); |
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| 207 | |
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| 208 | /* This is an HPUX system call, with return value copied out */ |
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| 209 | asm volatile (" stw %%r19,-28(0,%%r30)\n\ |
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| 210 | ldil L%%0xc0000000,%%r1\n\ |
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| 211 | ble 4(7,%%r1)\n\ |
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| 212 | ldi 3,%%r22\n\ |
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| 213 | ldw -28(0,%%r30),%%r19\n\ |
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| 214 | copy %%r28, %0" |
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| 215 | : "=r" (rc) |
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| 216 | : ); |
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| 217 | |
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| 218 | rtems_interrupt_enable(level); |
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| 219 | return rc; |
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| 220 | } |
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| 221 | |
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| 222 | static int |
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| 223 | host_write_syscall( |
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| 224 | int fd, |
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| 225 | char *buffer, |
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| 226 | int count |
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| 227 | ) |
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| 228 | { |
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| 229 | unsigned32 level; |
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| 230 | int rc; |
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| 231 | |
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| 232 | rtems_interrupt_disable(level); |
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| 233 | |
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| 234 | /* This is an HPUX system call, with return value copied out */ |
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| 235 | asm volatile (" stw %%r19,-28(0,%%r30)\n\ |
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| 236 | ldil L%%0xc0000000,%%r1\n\ |
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| 237 | ble 4(7,%%r1)\n\ |
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| 238 | ldi 4,%%r22\n\ |
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| 239 | ldw -28(0,%%r30),%%r19\n\ |
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| 240 | copy %%r28, %0" |
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| 241 | : "=r" (rc) |
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| 242 | : ); |
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| 243 | |
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| 244 | rtems_interrupt_enable(level); |
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| 245 | return rc; |
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| 246 | } |
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| 247 | |
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