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  1. /*
  2.  * Copyright (C) 2003 Josef Cejka
  3.  * Copyright (C) 2005 Jakub Jermar
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <console/console.h>
  31. #include <console/chardev.h>
  32. #include <synch/waitq.h>
  33. #include <synch/spinlock.h>
  34. #include <arch/types.h>
  35. #include <typedefs.h>
  36. #include <arch.h>
  37. #include <func.h>
  38. #include <print.h>
  39. #include <atomic.h>
  40.  
  41. #define BUFLEN 2048
  42. static char debug_buffer[BUFLEN];
  43. static size_t offset = 0;
  44. /** Initialize stdout to something that does not print, but does not fail
  45.  *
  46.  * Save data in some buffer so that it could be retrieved in the debugger
  47.  */
  48. static void null_putchar(chardev_t *d, const char ch)
  49. {
  50.     if (offset >= BUFLEN)
  51.         offset = 0;
  52.     debug_buffer[offset++] = ch;
  53. }
  54.  
  55. static chardev_operations_t null_stdout_ops = {
  56.     .write = null_putchar
  57. };
  58. chardev_t null_stdout = {
  59.     .name = "null",
  60.     .op = &null_stdout_ops
  61. };
  62.  
  63. /** Standard input character device. */
  64. chardev_t *stdin = NULL;
  65. chardev_t *stdout = &null_stdout;
  66.  
  67. /** Get character from character device. Do not echo character.
  68.  *
  69.  * @param chardev Character device.
  70.  *
  71.  * @return Character read.
  72.  */
  73. __u8 _getc(chardev_t *chardev)
  74. {
  75.     __u8 ch;
  76.     ipl_t ipl;
  77.  
  78.     if (atomic_get(&haltstate)) {
  79.         /* If we are here, we are hopefully on the processor, that
  80.          * issued the 'halt' command, so proceed to read the character
  81.          * directly from input
  82.          */
  83.         if (chardev->op->read)
  84.             return chardev->op->read(chardev);
  85.         /* no other way of interacting with user, halt */
  86.         if (CPU)
  87.             printf("cpu%d: ", CPU->id);
  88.         else
  89.             printf("cpu: ");
  90.         printf("halted - no kconsole\n");
  91.         cpu_halt();
  92.     }
  93.  
  94.     waitq_sleep(&chardev->wq);
  95.     ipl = interrupts_disable();
  96.     spinlock_lock(&chardev->lock);
  97.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  98.     chardev->counter--;
  99.     spinlock_unlock(&chardev->lock);
  100.     interrupts_restore(ipl);
  101.  
  102.     chardev->op->resume(chardev);
  103.  
  104.     return ch;
  105. }
  106.  
  107. /** Get string from character device.
  108.  *
  109.  * Read characters from character device until first occurrence
  110.  * of newline character.
  111.  *
  112.  * @param chardev Character device.
  113.  * @param buf Buffer where to store string terminated by '\0'.
  114.  * @param len Size of the buffer.
  115.  *
  116.  * @return Number of characters read.
  117.  */
  118. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  119. {
  120.     index_t index = 0;
  121.     char ch;
  122.  
  123.     while (index < buflen) {
  124.         ch = _getc(chardev);
  125.         if (ch == '\b') {
  126.             if (index > 0) {
  127.                 index--;
  128.                 /* Space backspace, space */
  129.                 putchar('\b');
  130.                 putchar(' ');
  131.                 putchar('\b');
  132.             }
  133.             continue;
  134.         }
  135.         putchar(ch);
  136.  
  137.         if (ch == '\n') { /* end of string => write 0, return */
  138.             buf[index] = '\0';
  139.             return (count_t) index;
  140.         }
  141.         buf[index++] = ch;
  142.     }
  143.     return (count_t) index;
  144. }
  145.  
  146. /** Get character from device & echo it to screen */
  147. __u8 getc(chardev_t *chardev)
  148. {
  149.     __u8 ch;
  150.  
  151.     ch = _getc(chardev);
  152.     putchar(ch);
  153.     return ch;
  154. }
  155.  
  156. void putchar(char c)
  157. {
  158.     if (stdout->op->write)
  159.         stdout->op->write(stdout, c);
  160. }
  161.