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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 KLOG_SIZE 4096
  47.  
  48. /**< Kernel log cyclic buffer */
  49. static char klog[KLOG_SIZE];
  50.  
  51. /**< First kernel log characters */
  52. static index_t klog_start = 0;
  53. /**< Number of valid kernel log characters */
  54. static size_t klog_len = 0;
  55. /**< Number of stored (not printed) kernel log characters */
  56. static size_t klog_stored = 0;
  57.  
  58. static chardev_operations_t null_stdout_ops = {
  59.     .suspend = NULL,
  60.     .resume = NULL,
  61.     .write = NULL,
  62.     .read = NULL
  63. };
  64.  
  65. chardev_t null_stdout = {
  66.     .name = "null",
  67.     .op = &null_stdout_ops
  68. };
  69.  
  70. /** Standard input character device. */
  71. chardev_t *stdin = NULL;
  72. chardev_t *stdout = &null_stdout;
  73.  
  74. /** Get character from character device. Do not echo character.
  75.  *
  76.  * @param chardev Character device.
  77.  *
  78.  * @return Character read.
  79.  */
  80. uint8_t _getc(chardev_t *chardev)
  81. {
  82.     uint8_t ch;
  83.     ipl_t ipl;
  84.  
  85.     if (atomic_get(&haltstate)) {
  86.         /* If we are here, we are hopefully on the processor, that
  87.          * issued the 'halt' command, so proceed to read the character
  88.          * directly from input
  89.          */
  90.         if (chardev->op->read)
  91.             return chardev->op->read(chardev);
  92.         /* no other way of interacting with user, halt */
  93.         if (CPU)
  94.             printf("cpu%u: ", CPU->id);
  95.         else
  96.             printf("cpu: ");
  97.         printf("halted - no kconsole\n");
  98.         cpu_halt();
  99.     }
  100.  
  101.     waitq_sleep(&chardev->wq);
  102.     ipl = interrupts_disable();
  103.     spinlock_lock(&chardev->lock);
  104.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  105.     chardev->counter--;
  106.     spinlock_unlock(&chardev->lock);
  107.     interrupts_restore(ipl);
  108.  
  109.     chardev->op->resume(chardev);
  110.  
  111.     return ch;
  112. }
  113.  
  114. /** Get string from character device.
  115.  *
  116.  * Read characters from character device until first occurrence
  117.  * of newline character.
  118.  *
  119.  * @param chardev Character device.
  120.  * @param buf Buffer where to store string terminated by '\0'.
  121.  * @param buflen Size of the buffer.
  122.  *
  123.  * @return Number of characters read.
  124.  */
  125. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  126. {
  127.     index_t index = 0;
  128.     char ch;
  129.  
  130.     while (index < buflen) {
  131.         ch = _getc(chardev);
  132.         if (ch == '\b') {
  133.             if (index > 0) {
  134.                 index--;
  135.                 /* Space backspace, space */
  136.                 putchar('\b');
  137.                 putchar(' ');
  138.                 putchar('\b');
  139.             }
  140.             continue;
  141.         }
  142.         putchar(ch);
  143.  
  144.         if (ch == '\n') { /* end of string => write 0, return */
  145.             buf[index] = '\0';
  146.             return (count_t) index;
  147.         }
  148.         buf[index++] = ch;
  149.     }
  150.     return (count_t) index;
  151. }
  152.  
  153. /** Get character from device & echo it to screen */
  154. uint8_t getc(chardev_t *chardev)
  155. {
  156.     uint8_t ch;
  157.  
  158.     ch = _getc(chardev);
  159.     putchar(ch);
  160.     return ch;
  161. }
  162.  
  163. void putchar(char c)
  164. {
  165.     if ((klog_stored > 0) && (stdout->op->write)) {
  166.         /* Print charaters stored in kernel log */
  167.         index_t i;
  168.         for (i = klog_len - klog_stored; i < klog_len; i++)
  169.             stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]);
  170.         klog_stored = 0;
  171.     }
  172.    
  173.     /* Store character in the cyclic kernel log */
  174.     klog[(klog_start + klog_len) % KLOG_SIZE] = c;
  175.     if (klog_len < KLOG_SIZE)
  176.         klog_len++;
  177.     else
  178.         klog_start = (klog_start + 1) % KLOG_SIZE;
  179.    
  180.     if (stdout->op->write)
  181.         stdout->op->write(stdout, c);
  182.     else {
  183.         /* The character is just in the kernel log */
  184.         if (klog_stored < klog_len)
  185.             klog_stored++;
  186.     }
  187. }
  188.  
  189. /** @}
  190.  */
  191.