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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 klog KLog
  30.  * @brief HelenOS KLog
  31.  * @{
  32.  */
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <stdio.h>
  38. #include <ipc/ipc.h>
  39. #include <async.h>
  40. #include <ipc/services.h>
  41. #include <as.h>
  42. #include <sysinfo.h>
  43. #include <io/stream.h>
  44. #include <console.h>
  45. #include <event.h>
  46. #include <errno.h>
  47.  
  48. #define NAME "klog"
  49.  
  50. #define KLOG_SIZE   PAGE_SIZE
  51. #define KLOG_LENGTH (KLOG_SIZE / sizeof(wchar_t))
  52.  
  53. /* Pointer to klog area */
  54. static wchar_t *klog;
  55.  
  56. static void interrupt_received(ipc_callid_t callid, ipc_call_t *call)
  57. {
  58.     async_serialize_start();
  59.    
  60.     size_t klog_start = (size_t) IPC_GET_ARG1(*call);
  61.     size_t klog_len = (size_t) IPC_GET_ARG2(*call);
  62.     size_t klog_stored = (size_t) IPC_GET_ARG3(*call);
  63.     size_t i;
  64.     for (i = klog_len - klog_stored; i < klog_len; i++)
  65.         putchar(klog[(klog_start + i) % KLOG_LENGTH]);
  66.    
  67.     async_serialize_end();
  68. }
  69.  
  70. int main(int argc, char *argv[])
  71. {
  72.     console_wait();
  73.    
  74.     klog = (char *) as_get_mappable_page(KLOG_SIZE);
  75.     if (klog == NULL) {
  76.         printf(NAME ": Error allocating memory area\n");
  77.         return -1;
  78.     }
  79.    
  80.     int res = ipc_share_in_start_1_0(PHONE_NS, (void *) klog, KLOG_SIZE,
  81.         SERVICE_MEM_KLOG);
  82.     if (res != EOK) {
  83.         printf(NAME ": Error initializing memory area\n");
  84.         return -1;
  85.     }
  86.    
  87.     if (event_subscribe(EVENT_KLOG, 0) != EOK) {
  88.         printf(NAME ": Error registering klog notifications\n");
  89.         return -1;
  90.     }
  91.    
  92.     async_set_interrupt_received(interrupt_received);
  93.     klog_update();
  94.     async_manager();
  95.  
  96.     return 0;
  97. }
  98.  
  99. /** @}
  100.  */
  101.