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