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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/irq.h>
  45. #include <arch.h>
  46. #include <func.h>
  47. #include <print.h>
  48. #include <atomic.h>
  49. #include <syscall/copy.h>
  50. #include <errno.h>
  51.  
  52. #define KLOG_SIZE PAGE_SIZE
  53. #define KLOG_LATENCY 8
  54.  
  55. /** Kernel log cyclic buffer */
  56. static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
  57.  
  58. /** Kernel log initialized */
  59. static bool klog_inited = false;
  60. /** First kernel log characters */
  61. static index_t klog_start = 0;
  62. /** Number of valid kernel log characters */
  63. static size_t klog_len = 0;
  64. /** Number of stored (not printed) kernel log characters */
  65. static size_t klog_stored = 0;
  66. /** Number of stored kernel log characters for uspace */
  67. static size_t klog_uspace = 0;
  68.  
  69. /** Silence output */
  70. bool silent = false;
  71.  
  72. /** Kernel log spinlock */
  73. SPINLOCK_INITIALIZE(klog_lock);
  74.  
  75. /** Physical memory area used for klog buffer */
  76. static parea_t klog_parea;
  77.  
  78. /** Standard input and output character devices */
  79. indev_t *stdin = NULL;
  80. outdev_t *stdout = NULL;
  81.  
  82. /** Initialize kernel logging facility
  83.  *
  84.  * The shared area contains kernel cyclic buffer. Userspace application may
  85.  * be notified on new data with indication of position and size
  86.  * of the data within the circular buffer.
  87.  *
  88.  */
  89. void klog_init(void)
  90. {
  91.     void *faddr = (void *) KA2PA(klog);
  92.    
  93.     ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
  94.     ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
  95.    
  96.     klog_parea.pbase = (uintptr_t) faddr;
  97.     klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
  98.     ddi_parea_register(&klog_parea);
  99.    
  100.     sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
  101.     sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
  102.    
  103.     //irq_initialize(&klog_irq);
  104.     //klog_irq.devno = devno;
  105.     //klog_irq.inr = KLOG_VIRT_INR;
  106.     //klog_irq.claim = klog_claim;
  107.     //irq_register(&klog_irq);
  108.    
  109.     spinlock_lock(&klog_lock);
  110.     klog_inited = true;
  111.     spinlock_unlock(&klog_lock);
  112. }
  113.  
  114. void grab_console(void)
  115. {
  116.     silent = false;
  117.     arch_grab_console();
  118. }
  119.  
  120. void release_console(void)
  121. {
  122.     silent = true;
  123.     arch_release_console();
  124. }
  125.  
  126. /** Tell kernel to get keyboard/console access again */
  127. unative_t sys_debug_enable_console(void)
  128. {
  129. #ifdef CONFIG_KCONSOLE
  130.     grab_console();
  131.     return true;
  132. #else
  133.     return false;
  134. #endif
  135. }
  136.  
  137. /** Tell kernel to relinquish keyboard/console access */
  138. unative_t sys_debug_disable_console(void)
  139. {
  140.     release_console();
  141.     return true;
  142. }
  143.  
  144. bool check_poll(indev_t *indev)
  145. {
  146.     if (indev == NULL)
  147.         return false;
  148.    
  149.     if (indev->op == NULL)
  150.         return false;
  151.    
  152.     return (indev->op->poll != NULL);
  153. }
  154.  
  155. /** Get character from input character device. Do not echo character.
  156.  *
  157.  * @param indev Input character device.
  158.  * @return Character read.
  159.  *
  160.  */
  161. uint8_t _getc(indev_t *indev)
  162. {
  163.     if (atomic_get(&haltstate)) {
  164.         /* If we are here, we are hopefully on the processor that
  165.          * issued the 'halt' command, so proceed to read the character
  166.          * directly from input
  167.          */
  168.         if (check_poll(indev))
  169.             return indev->op->poll(indev);
  170.        
  171.         /* No other way of interacting with user */
  172.         interrupts_disable();
  173.        
  174.         if (CPU)
  175.             printf("cpu%u: ", CPU->id);
  176.         else
  177.             printf("cpu: ");
  178.         printf("halted (no polling input)\n");
  179.         cpu_halt();
  180.     }
  181.    
  182.     waitq_sleep(&indev->wq);
  183.     ipl_t ipl = interrupts_disable();
  184.     spinlock_lock(&indev->lock);
  185.     uint8_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN];
  186.     indev->counter--;
  187.     spinlock_unlock(&indev->lock);
  188.     interrupts_restore(ipl);
  189.    
  190.     return ch;
  191. }
  192.  
  193. /** Get string from input character device.
  194.  *
  195.  * Read characters from input character device until first occurrence
  196.  * of newline character.
  197.  *
  198.  * @param indev  Input character device.
  199.  * @param buf    Buffer where to store string terminated by '\0'.
  200.  * @param buflen Size of the buffer.
  201.  *
  202.  * @return Number of characters read.
  203.  *
  204.  */
  205. count_t gets(indev_t *indev, char *buf, size_t buflen)
  206. {
  207.     index_t index = 0;
  208.    
  209.     while (index < buflen) {
  210.         char ch = _getc(indev);
  211.         if (ch == '\b') {
  212.             if (index > 0) {
  213.                 index--;
  214.                 /* Space backspace, space */
  215.                 putchar('\b');
  216.                 putchar(' ');
  217.                 putchar('\b');
  218.             }
  219.             continue;
  220.         }
  221.         putchar(ch);
  222.        
  223.         if (ch == '\n') { /* end of string => write 0, return */
  224.             buf[index] = '\0';
  225.             return (count_t) index;
  226.         }
  227.         buf[index++] = ch;
  228.     }
  229.    
  230.     return (count_t) index;
  231. }
  232.  
  233. /** Get character from input device & echo it to screen */
  234. uint8_t getc(indev_t *indev)
  235. {
  236.     uint8_t ch = _getc(indev);
  237.     putchar(ch);
  238.     return ch;
  239. }
  240.  
  241. void klog_update(void)
  242. {
  243.     spinlock_lock(&klog_lock);
  244.    
  245. //  if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
  246. //      ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
  247. //      klog_uspace = 0;
  248. //  }
  249.    
  250.     spinlock_unlock(&klog_lock);
  251. }
  252.  
  253. void putchar(char c)
  254. {
  255.     spinlock_lock(&klog_lock);
  256.    
  257.     if ((klog_stored > 0) && (stdout) && (stdout->op->write)) {
  258.         /* Print charaters stored in kernel log */
  259.         index_t i;
  260.         for (i = klog_len - klog_stored; i < klog_len; i++)
  261.             stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);
  262.         klog_stored = 0;
  263.     }
  264.    
  265.     /* Store character in the cyclic kernel log */
  266.     klog[(klog_start + klog_len) % KLOG_SIZE] = c;
  267.     if (klog_len < KLOG_SIZE)
  268.         klog_len++;
  269.     else
  270.         klog_start = (klog_start + 1) % KLOG_SIZE;
  271.    
  272.     if ((stdout) && (stdout->op->write))
  273.         stdout->op->write(stdout, c, silent);
  274.     else {
  275.         /* The character is just in the kernel log */
  276.         if (klog_stored < klog_len)
  277.             klog_stored++;
  278.     }
  279.    
  280.     /* The character is stored for uspace */
  281.     if (klog_uspace < klog_len)
  282.         klog_uspace++;
  283.    
  284.     /* Check notify uspace to update */
  285.     bool update;
  286.     if ((klog_uspace > KLOG_LATENCY) || (c == '\n'))
  287.         update = true;
  288.     else
  289.         update = false;
  290.    
  291.     spinlock_unlock(&klog_lock);
  292.    
  293.     if (update)
  294.         klog_update();
  295. }
  296.  
  297. /** Print using kernel facility
  298.  *
  299.  * Print to kernel log.
  300.  *
  301.  */
  302. unative_t sys_klog(int fd, const void * buf, size_t count)
  303. {
  304.     char *data;
  305.     int rc;
  306.  
  307.     if (count > PAGE_SIZE)
  308.         return ELIMIT;
  309.    
  310.     if (count > 0) {
  311.         data = (char *) malloc(count + 1, 0);
  312.         if (!data)
  313.             return ENOMEM;
  314.        
  315.         rc = copy_from_uspace(data, buf, count);
  316.         if (rc) {
  317.             free(data);
  318.             return rc;
  319.         }
  320.         data[count] = 0;
  321.        
  322.         printf("%s", data);
  323.         free(data);
  324.     } else
  325.         klog_update();
  326.    
  327.     return count;
  328. }
  329.  
  330. /** @}
  331.  */
  332.