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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. /**< Silent output */
  69. static 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(void *instance)
  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.vbase = (uintptr_t) klog;
  130.     klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
  131.     klog_parea.cacheable = true;
  132.     ddi_parea_register(&klog_parea);
  133.  
  134.     sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
  135.     sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
  136.     sysinfo_set_item_val("klog.devno", NULL, devno);
  137.     sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
  138.  
  139.     irq_initialize(&klog_irq);
  140.     klog_irq.devno = devno;
  141.     klog_irq.inr = KLOG_VIRT_INR;
  142.     klog_irq.claim = klog_claim;
  143.     irq_register(&klog_irq);
  144.    
  145.     spinlock_lock(&klog_lock);
  146.     klog_inited = true;
  147.     spinlock_unlock(&klog_lock);
  148. }
  149.  
  150. void grab_console(void)
  151. {
  152.     silent = false;
  153.     arch_grab_console();
  154. }
  155.  
  156. void release_console(void)
  157. {
  158.     silent = true;
  159.     arch_release_console();
  160. }
  161.  
  162. /** Get character from character device. Do not echo character.
  163.  *
  164.  * @param chardev Character device.
  165.  *
  166.  * @return Character read.
  167.  */
  168. uint8_t _getc(chardev_t *chardev)
  169. {
  170.     uint8_t ch;
  171.     ipl_t ipl;
  172.  
  173.     if (atomic_get(&haltstate)) {
  174.         /* If we are here, we are hopefully on the processor, that
  175.          * issued the 'halt' command, so proceed to read the character
  176.          * directly from input
  177.          */
  178.         if (chardev->op->read)
  179.             return chardev->op->read(chardev);
  180.         /* no other way of interacting with user, halt */
  181.         if (CPU)
  182.             printf("cpu%u: ", CPU->id);
  183.         else
  184.             printf("cpu: ");
  185.         printf("halted (no kconsole)\n");
  186.         cpu_halt();
  187.     }
  188.  
  189.     waitq_sleep(&chardev->wq);
  190.     ipl = interrupts_disable();
  191.     spinlock_lock(&chardev->lock);
  192.     ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
  193.     chardev->counter--;
  194.     spinlock_unlock(&chardev->lock);
  195.     interrupts_restore(ipl);
  196.  
  197.     chardev->op->resume(chardev);
  198.  
  199.     return ch;
  200. }
  201.  
  202. /** Get string from character device.
  203.  *
  204.  * Read characters from character device until first occurrence
  205.  * of newline character.
  206.  *
  207.  * @param chardev Character device.
  208.  * @param buf Buffer where to store string terminated by '\0'.
  209.  * @param buflen Size of the buffer.
  210.  *
  211.  * @return Number of characters read.
  212.  */
  213. count_t gets(chardev_t *chardev, char *buf, size_t buflen)
  214. {
  215.     index_t index = 0;
  216.     char ch;
  217.    
  218.     while (index < buflen) {
  219.         ch = _getc(chardev);
  220.         if (ch == '\b') {
  221.             if (index > 0) {
  222.                 index--;
  223.                 /* Space backspace, space */
  224.                 putchar('\b');
  225.                 putchar(' ');
  226.                 putchar('\b');
  227.             }
  228.             continue;
  229.         }
  230.         putchar(ch);
  231.        
  232.         if (ch == '\n') { /* end of string => write 0, return */
  233.             buf[index] = '\0';
  234.             return (count_t) index;
  235.         }
  236.         buf[index++] = ch;
  237.     }
  238.     return (count_t) index;
  239. }
  240.  
  241. /** Get character from device & echo it to screen */
  242. uint8_t getc(chardev_t *chardev)
  243. {
  244.     uint8_t ch;
  245.  
  246.     ch = _getc(chardev);
  247.     putchar(ch);
  248.     return ch;
  249. }
  250.  
  251. void klog_update(void)
  252. {
  253.     spinlock_lock(&klog_lock);
  254.    
  255.     if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
  256.         ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
  257.         klog_uspace = 0;
  258.     }
  259.    
  260.     spinlock_unlock(&klog_lock);
  261. }
  262.  
  263. void putchar(char c)
  264. {
  265.     spinlock_lock(&klog_lock);
  266.    
  267.     if ((klog_stored > 0) && (stdout->op->write)) {
  268.         /* Print charaters stored in kernel log */
  269.         index_t i;
  270.         for (i = klog_len - klog_stored; i < klog_len; i++)
  271.             stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);
  272.         klog_stored = 0;
  273.     }
  274.    
  275.     /* Store character in the cyclic kernel log */
  276.     klog[(klog_start + klog_len) % KLOG_SIZE] = c;
  277.     if (klog_len < KLOG_SIZE)
  278.         klog_len++;
  279.     else
  280.         klog_start = (klog_start + 1) % KLOG_SIZE;
  281.    
  282.     if (stdout->op->write)
  283.         stdout->op->write(stdout, c, silent);
  284.     else {
  285.         /* The character is just in the kernel log */
  286.         if (klog_stored < klog_len)
  287.             klog_stored++;
  288.     }
  289.    
  290.     /* The character is stored for uspace */
  291.     if (klog_uspace < klog_len)
  292.         klog_uspace++;
  293.    
  294.     /* Check notify uspace to update */
  295.     bool update;
  296.     if ((klog_uspace > KLOG_LATENCY) || (c == '\n'))
  297.         update = true;
  298.     else
  299.         update = false;
  300.    
  301.     spinlock_unlock(&klog_lock);
  302.    
  303.     if (update)
  304.         klog_update();
  305. }
  306.  
  307. /** @}
  308.  */
  309.