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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. #include <mm/frame.h>
  30. #include <sysinfo/sysinfo.h>
  31. #include <console/klog.h>
  32. #include <print.h>
  33. #include <ipc/irq.h>
  34.  
  35. /* Order of frame to be allocated for klog communication */
  36. #define KLOG_ORDER 0
  37.  
  38. static char *klog;
  39. static int klogsize;
  40. static int klogpos;
  41.  
  42. SPINLOCK_INITIALIZE(klog_lock);
  43.  
  44. /** Initialize kernel logging facility
  45.  *
  46.  * Allocate pages that are to be shared with uspace for console data.
  47.  * The shared area is a circular buffer. Userspace application may
  48.  * be notified on new data with indication of position and size
  49.  * of the data within the circular buffer.
  50.  */
  51. void klog_init(void)
  52. {
  53.     void *faddr;
  54.  
  55.     faddr = (void *)PFN2ADDR(frame_alloc(KLOG_ORDER, FRAME_ATOMIC));
  56.     if (!faddr)
  57.         panic("Cannot allocate page for klog");
  58.     klog = (char *)PA2KA(faddr);
  59.    
  60.     sysinfo_set_item_val("klog.faddr", NULL, (__native)faddr);
  61.     sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
  62.  
  63.     klogsize = PAGE_SIZE << KLOG_ORDER;
  64.     klogpos = 0;
  65. }
  66.  
  67. static void klog_vprintf(const char *fmt, va_list args)
  68. {
  69.     int ret;
  70.     va_list atst;
  71.  
  72.     va_copy(atst, args);
  73.     spinlock_lock(&klog_lock);
  74.  
  75.     ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
  76.     if (ret >= klogsize-klogpos) {
  77.         klogpos = 0;
  78.         if (ret >= klogsize)
  79.             goto out;
  80.     }
  81.     ipc_irq_send_msg(IPC_IRQ_KLOG, klogpos, ret);
  82.     klogpos += ret;
  83.     if (klogpos >= klogsize)
  84.         klogpos = 0;
  85. out:
  86.     spinlock_unlock(&klog_lock);
  87.     va_end(atst);
  88. }
  89.  
  90. /** Printf a message to kernel-uspace log */
  91. void klog_printf(const char *fmt, ...)
  92. {
  93.     va_list args;
  94.    
  95.     va_start(args, fmt);
  96.    
  97.     klog_vprintf(fmt, args);
  98.  
  99.     va_end(args);
  100. }
  101.