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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. /** @addtogroup genericconsole
  31.  * @{
  32.  */
  33. /** @file
  34.  */
  35.  
  36. #include <console/console.h>
  37. #include <console/chardev.h>
  38. #include <synch/waitq.h>
  39. #include <synch/spinlock.h>
  40. #include <arch/types.h>
  41. #include <arch.h>
  42. #include <func.h>
  43. #include <print.h>
  44. #include <atomic.h>
  45.  
  46. #define BUFLEN 2048
  47. static char debug_buffer[BUFLEN];
  48. static size_t offset = 0;
  49. /** Initialize stdout to something that does not print, but does not fail
  50.  *
  51.  * Save data in some buffer so that it could be retrieved in the debugger
  52.  */
  53. static void null_putchar(chardev_t *d, const char ch)
  54. {
  55.     if (offset >= BUFLEN)
  56.         offset = 0;
  57.     debug_buffer[offset++] = ch;
  58. }
  59.  
  60. static chardev_operations_t null_stdout_ops = {
  61.     .write = null_putchar
  62. };
  63.  
  64. chardev_t null_stdout = {
  65.     .name = "null",
  66.     .op = &null_stdout_ops
  67. };
  68.  
  69. /** Standard input character device. */
  70. chardev_t *stdin = NULL;
  71. chardev_t *stdout = &null_stdout;
  72.  
  73. /** Get character from character device. Do not echo character.
  74.  *
  75.  * @param chardev Character device.
  76.  *
  77.  * @return Character read.
  78.  */
  79. uint8_t _getc(chardev_t *chardev)
  80. {
  81.     uint8_t ch;
  82.     ipl_t ipl;
  83.  
  84.     if (atomic_get(&haltstate)) {
  85.         /* If we are here, we are hopefully on the processor, that
  86.          * issued the 'halt' command, so proceed to read the character
  87.          * directly from input
  88.          */
  89.         if (chardev->op->read)
  90.             return chardev->op->read(chardev);
  91.         /* no other way of interacting with user, halt */
  92.         if (CPU)
  93.             printf("cpu%d: ", CPU->id);
  94.         else
  95.             printf("cpu: ");
  96.         printf("halted - no kconsole\n");
  97.         cpu_halt();
  98.     }
  99.  
  100.     waitq_sleep(&chardev->wq);
  101.     ipl = interrupts_disable();
  102.     spinlock_lock(&chardev->lock);
  103.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  104.     chardev->counter--;
  105.     spinlock_unlock(&chardev->lock);
  106.     interrupts_restore(ipl);
  107.  
  108.     chardev->op->resume(chardev);
  109.  
  110.     return ch;
  111. }
  112.  
  113. /** Get string from character device.
  114.  *
  115.  * Read characters from character device until first occurrence
  116.  * of newline character.
  117.  *
  118.  * @param chardev Character device.
  119.  * @param buf Buffer where to store string terminated by '\0'.
  120.  * @param buflen Size of the buffer.
  121.  *
  122.  * @return Number of characters read.
  123.  */
  124. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  125. {
  126.     index_t index = 0;
  127.     char ch;
  128.  
  129.     while (index < buflen) {
  130.         ch = _getc(chardev);
  131.         if (ch == '\b') {
  132.             if (index > 0) {
  133.                 index--;
  134.                 /* Space backspace, space */
  135.                 putchar('\b');
  136.                 putchar(' ');
  137.                 putchar('\b');
  138.             }
  139.             continue;
  140.         }
  141.         putchar(ch);
  142.  
  143.         if (ch == '\n') { /* end of string => write 0, return */
  144.             buf[index] = '\0';
  145.             return (count_t) index;
  146.         }
  147.         buf[index++] = ch;
  148.     }
  149.     return (count_t) index;
  150. }
  151.  
  152. /** Get character from device & echo it to screen */
  153. uint8_t getc(chardev_t *chardev)
  154. {
  155.     uint8_t ch;
  156.  
  157.     ch = _getc(chardev);
  158.     putchar(ch);
  159.     return ch;
  160. }
  161.  
  162. void putchar(char c)
  163. {
  164.     if (stdout->op->write)
  165.         stdout->op->write(stdout, c);
  166. }
  167.  
  168. /** @}
  169.  */
  170.