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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup genericklog
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <mm/frame.h>
  36. #include <sysinfo/sysinfo.h>
  37. #include <console/klog.h>
  38. #include <print.h>
  39. #include <ddi/device.h>
  40. #include <ddi/irq.h>
  41. #include <ipc/irq.h>
  42.  
  43. /* Order of frame to be allocated for klog communication */
  44. #define KLOG_ORDER  0
  45.  
  46. static char *klog;
  47. static int klogsize;
  48. static int klogpos;
  49.  
  50. SPINLOCK_INITIALIZE(klog_lock);
  51.  
  52. static irq_t klog_irq;
  53.  
  54. static irq_ownership_t klog_claim(void);
  55.  
  56. /** Initialize kernel logging facility
  57.  *
  58.  * Allocate pages that are to be shared with uspace for console data.
  59.  * The shared area is a circular buffer. Userspace application may
  60.  * be notified on new data with indication of position and size
  61.  * of the data within the circular buffer.
  62.  */
  63. void klog_init(void)
  64. {
  65.     void *faddr;
  66.  
  67.     faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC);
  68.     if (!faddr)
  69.         panic("Cannot allocate page for klog");
  70.     klog = (char *)PA2KA(faddr);
  71.    
  72.     devno_t devno = device_assign_devno();
  73.    
  74.     sysinfo_set_item_val("klog.faddr", NULL, (unative_t)faddr);
  75.     sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
  76.     sysinfo_set_item_val("klog.devno", NULL, devno);
  77.     sysinfo_set_item_val("klog.inr", NULL, VIRT_INR_KLOG);
  78.  
  79.     irq_initialize(&klog_irq);
  80.     klog_irq.devno = devno;
  81.     klog_irq.inr = VIRT_INR_KLOG;
  82.     klog_irq.claim = klog_claim;
  83.     irq_register(&klog_irq);
  84.  
  85.     klogsize = PAGE_SIZE << KLOG_ORDER;
  86.     klogpos = 0;
  87. }
  88.  
  89. /** Allways refuse IRQ ownership.
  90.  *
  91.  * This is not a real IRQ, so we always decline.
  92.  *
  93.  * @return Always returns IRQ_DECLINE.
  94.  */
  95. irq_ownership_t klog_claim(void)
  96. {
  97.     return IRQ_DECLINE;
  98. }
  99.  
  100. static void klog_vprintf(const char *fmt, va_list args)
  101. {
  102.     int ret;
  103.     va_list atst;
  104.  
  105.     va_copy(atst, args);
  106.     spinlock_lock(&klog_lock);
  107.  
  108.     ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
  109.     if (ret >= klogsize-klogpos) {
  110.         klogpos = 0;
  111.         if (ret >= klogsize)
  112.             goto out;
  113.     }
  114.     ipc_irq_send_msg(&klog_irq, klogpos, ret, 0);
  115.     klogpos += ret;
  116.     if (klogpos >= klogsize)
  117.         klogpos = 0;
  118. out:
  119.     spinlock_unlock(&klog_lock);
  120.     va_end(atst);
  121. }
  122.  
  123. /** Printf a message to kernel-uspace log */
  124. void klog_printf(const char *fmt, ...)
  125. {
  126.     va_list args;
  127.    
  128.     va_start(args, fmt);
  129.    
  130.     klog_vprintf(fmt, args);
  131.  
  132.     va_end(args);
  133. }
  134.  
  135. /** @}
  136.  */
  137.