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