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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 <sysinfo/sysinfo.h>
  39. #include <synch/waitq.h>
  40. #include <synch/spinlock.h>
  41. #include <arch/types.h>
  42. #include <ddi/irq.h>
  43. #include <ddi/ddi.h>
  44. #include <ipc/event.h>
  45. #include <ipc/irq.h>
  46. #include <arch.h>
  47. #include <func.h>
  48. #include <print.h>
  49. #include <putchar.h>
  50. #include <atomic.h>
  51. #include <syscall/copy.h>
  52. #include <errno.h>
  53. #include <string.h>
  54.  
  55. #define KLOG_PAGES    4
  56. #define KLOG_LENGTH   (KLOG_PAGES * PAGE_SIZE / sizeof(wchar_t))
  57. #define KLOG_LATENCY  8
  58.  
  59. /** Kernel log cyclic buffer */
  60. static wchar_t klog[KLOG_LENGTH] __attribute__ ((aligned (PAGE_SIZE)));
  61.  
  62. /** Kernel log initialized */
  63. static bool klog_inited = false;
  64. /** First kernel log characters */
  65. static index_t klog_start = 0;
  66. /** Number of valid kernel log characters */
  67. static size_t klog_len = 0;
  68. /** Number of stored (not printed) kernel log characters */
  69. static size_t klog_stored = 0;
  70. /** Number of stored kernel log characters for uspace */
  71. static size_t klog_uspace = 0;
  72.  
  73. /** Silence output */
  74. bool silent = false;
  75.  
  76. /** Kernel log spinlock */
  77. SPINLOCK_INITIALIZE(klog_lock);
  78.  
  79. /** Physical memory area used for klog buffer */
  80. static parea_t klog_parea;
  81.  
  82. /** Standard input and output character devices */
  83. indev_t *stdin = NULL;
  84. outdev_t *stdout = NULL;
  85.  
  86. /** Initialize kernel logging facility
  87.  *
  88.  * The shared area contains kernel cyclic buffer. Userspace application may
  89.  * be notified on new data with indication of position and size
  90.  * of the data within the circular buffer.
  91.  *
  92.  */
  93. void klog_init(void)
  94. {
  95.     void *faddr = (void *) KA2PA(klog);
  96.    
  97.     ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
  98.    
  99.     klog_parea.pbase = (uintptr_t) faddr;
  100.     klog_parea.frames = SIZE2FRAMES(sizeof(klog));
  101.     ddi_parea_register(&klog_parea);
  102.    
  103.     sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
  104.     sysinfo_set_item_val("klog.pages", NULL, KLOG_PAGES);
  105.    
  106.     spinlock_lock(&klog_lock);
  107.     klog_inited = true;
  108.     spinlock_unlock(&klog_lock);
  109. }
  110.  
  111. void grab_console(void)
  112. {
  113.     silent = false;
  114.     arch_grab_console();
  115. }
  116.  
  117. void release_console(void)
  118. {
  119.     silent = true;
  120.     arch_release_console();
  121. }
  122.  
  123. /** Tell kernel to get keyboard/console access again */
  124. unative_t sys_debug_enable_console(void)
  125. {
  126. #ifdef CONFIG_KCONSOLE
  127.     grab_console();
  128.     return true;
  129. #else
  130.     return false;
  131. #endif
  132. }
  133.  
  134. /** Tell kernel to relinquish keyboard/console access */
  135. unative_t sys_debug_disable_console(void)
  136. {
  137.     release_console();
  138.     return true;
  139. }
  140.  
  141. bool check_poll(indev_t *indev)
  142. {
  143.     if (indev == NULL)
  144.         return false;
  145.    
  146.     if (indev->op == NULL)
  147.         return false;
  148.    
  149.     return (indev->op->poll != NULL);
  150. }
  151.  
  152. /** Get character from input character device. Do not echo character.
  153.  *
  154.  * @param indev Input character device.
  155.  * @return Character read.
  156.  *
  157.  */
  158. wchar_t _getc(indev_t *indev)
  159. {
  160.     if (atomic_get(&haltstate)) {
  161.         /* If we are here, we are hopefully on the processor that
  162.          * issued the 'halt' command, so proceed to read the character
  163.          * directly from input
  164.          */
  165.         if (check_poll(indev))
  166.             return indev->op->poll(indev);
  167.        
  168.         /* No other way of interacting with user */
  169.         interrupts_disable();
  170.        
  171.         if (CPU)
  172.             printf("cpu%u: ", CPU->id);
  173.         else
  174.             printf("cpu: ");
  175.         printf("halted (no polling input)\n");
  176.         cpu_halt();
  177.     }
  178.    
  179.     waitq_sleep(&indev->wq);
  180.     ipl_t ipl = interrupts_disable();
  181.     spinlock_lock(&indev->lock);
  182.     wchar_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN];
  183.     indev->counter--;
  184.     spinlock_unlock(&indev->lock);
  185.     interrupts_restore(ipl);
  186.    
  187.     return ch;
  188. }
  189.  
  190. /** Get string from input character device.
  191.  *
  192.  * Read characters from input character device until first occurrence
  193.  * of newline character.
  194.  *
  195.  * @param indev  Input character device.
  196.  * @param buf    Buffer where to store string terminated by NULL.
  197.  * @param buflen Size of the buffer.
  198.  *
  199.  * @return Number of characters read.
  200.  *
  201.  */
  202. count_t gets(indev_t *indev, char *buf, size_t buflen)
  203. {
  204.     size_t offset = 0;
  205.     count_t count = 0;
  206.     buf[offset] = 0;
  207.    
  208.     wchar_t ch;
  209.     while ((ch = _getc(indev)) != '\n') {
  210.         if (ch == '\b') {
  211.             if (count > 0) {
  212.                 /* Space, backspace, space */
  213.                 putchar('\b');
  214.                 putchar(' ');
  215.                 putchar('\b');
  216.                
  217.                 count--;
  218.                 offset = str_lsize(buf, count);
  219.                 buf[offset] = 0;
  220.             }
  221.         }
  222.         if (chr_encode(ch, buf, &offset, buflen - 1) == EOK) {
  223.             putchar(ch);
  224.             count++;
  225.             buf[offset] = 0;
  226.         }
  227.     }
  228.    
  229.     return count;
  230. }
  231.  
  232. /** Get character from input device & echo it to screen */
  233. wchar_t getc(indev_t *indev)
  234. {
  235.     wchar_t ch = _getc(indev);
  236.     putchar(ch);
  237.     return ch;
  238. }
  239.  
  240. void klog_update(void)
  241. {
  242.     spinlock_lock(&klog_lock);
  243.    
  244.     if ((klog_inited) && (event_is_subscribed(EVENT_KLOG)) && (klog_uspace > 0)) {
  245.         event_notify_3(EVENT_KLOG, klog_start, klog_len, klog_uspace);
  246.         klog_uspace = 0;
  247.     }
  248.    
  249.     spinlock_unlock(&klog_lock);
  250. }
  251.  
  252. void putchar(const wchar_t ch)
  253. {
  254.     spinlock_lock(&klog_lock);
  255.    
  256.     if ((klog_stored > 0) && (stdout) && (stdout->op->write)) {
  257.         /* Print charaters stored in kernel log */
  258.         index_t i;
  259.         for (i = klog_len - klog_stored; i < klog_len; i++)
  260.             stdout->op->write(stdout, klog[(klog_start + i) % KLOG_LENGTH], silent);
  261.         klog_stored = 0;
  262.     }
  263.    
  264.     /* Store character in the cyclic kernel log */
  265.     klog[(klog_start + klog_len) % KLOG_LENGTH] = ch;
  266.     if (klog_len < KLOG_LENGTH)
  267.         klog_len++;
  268.     else
  269.         klog_start = (klog_start + 1) % KLOG_LENGTH;
  270.    
  271.     if ((stdout) && (stdout->op->write))
  272.         stdout->op->write(stdout, ch, silent);
  273.     else {
  274.         /* The character is just in the kernel log */
  275.         if (klog_stored < klog_len)
  276.             klog_stored++;
  277.     }
  278.    
  279.     /* The character is stored for uspace */
  280.     if (klog_uspace < klog_len)
  281.         klog_uspace++;
  282.    
  283.     /* Check notify uspace to update */
  284.     bool update;
  285.     if ((klog_uspace > KLOG_LATENCY) || (ch == '\n'))
  286.         update = true;
  287.     else
  288.         update = false;
  289.    
  290.     spinlock_unlock(&klog_lock);
  291.    
  292.     if (update)
  293.         klog_update();
  294. }
  295.  
  296. /** Print using kernel facility
  297.  *
  298.  * Print to kernel log.
  299.  *
  300.  */
  301. unative_t sys_klog(int fd, const void *buf, size_t size)
  302. {
  303.     char *data;
  304.     int rc;
  305.    
  306.     if (size > PAGE_SIZE)
  307.         return ELIMIT;
  308.    
  309.     if (size > 0) {
  310.         data = (char *) malloc(size + 1, 0);
  311.         if (!data)
  312.             return ENOMEM;
  313.        
  314.         rc = copy_from_uspace(data, buf, size);
  315.         if (rc) {
  316.             free(data);
  317.             return rc;
  318.         }
  319.         data[size] = 0;
  320.        
  321.         printf("%s", data);
  322.         free(data);
  323.     } else
  324.         klog_update();
  325.    
  326.     return size;
  327. }
  328.  
  329. /** @}
  330.  */
  331.