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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 KLog
  30.  * @brief Kernel logging facility
  31.  * @ingroup kernel
  32.  * @{
  33.  */
  34. /** @file
  35.  */
  36.  
  37. #include <mm/frame.h>
  38. #include <sysinfo/sysinfo.h>
  39. #include <console/klog.h>
  40. #include <print.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. /** Initialize kernel logging facility
  53.  *
  54.  * Allocate pages that are to be shared with uspace for console data.
  55.  * The shared area is a circular buffer. Userspace application may
  56.  * be notified on new data with indication of position and size
  57.  * of the data within the circular buffer.
  58.  */
  59. void klog_init(void)
  60. {
  61.     void *faddr;
  62.  
  63.     faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC));
  64.     if (!faddr)
  65.         panic("Cannot allocate page for klog");
  66.     klog = (char *)PA2KA(faddr);
  67.    
  68.     sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr);
  69.     sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
  70.  
  71.     klogsize = PAGE_SIZE << KLOG_ORDER;
  72.     klogpos = 0;
  73. }
  74.  
  75. static void klog_vprintf(const char *fmt, va_list args)
  76. {
  77.     int ret;
  78.     va_list atst;
  79.  
  80.     va_copy(atst, args);
  81.     spinlock_lock(&klog_lock);
  82.  
  83.     ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
  84.     if (ret >= klogsize-klogpos) {
  85.         klogpos = 0;
  86.         if (ret >= klogsize)
  87.             goto out;
  88.     }
  89.     ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret, 0);
  90.     klogpos += ret;
  91.     if (klogpos >= klogsize)
  92.         klogpos = 0;
  93. out:
  94.     spinlock_unlock(&klog_lock);
  95.     va_end(atst);
  96. }
  97.  
  98. /** Printf a message to kernel-uspace log */
  99. void klog_printf(const char *fmt, ...)
  100. {
  101.     va_list args;
  102.    
  103.     va_start(args, fmt);
  104.    
  105.     klog_vprintf(fmt, args);
  106.  
  107.     va_end(args);
  108. }
  109.  
  110.  /** @}
  111.  */
  112.  
  113.