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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 <ddi/ddi.h>
  42. #include <ipc/irq.h>
  43.  
  44. /** Physical memory area used for klog. */
  45. static parea_t klog_parea;
  46.    
  47. /*
  48.  * For now, we use 0 as INR.
  49.  * However, on some architectures 0 is the clock interrupt (e.g. amd64 and
  50.  * ia32). It is therefore desirable to have architecture specific definition of
  51.  * KLOG_VIRT_INR in the future.
  52.  */
  53. #define KLOG_VIRT_INR   0
  54.  
  55. /* Order of frame to be allocated for klog communication */
  56. #define KLOG_ORDER  0
  57.  
  58. static char *klog;
  59. static int klogsize;
  60. static int klogpos;
  61.  
  62. SPINLOCK_INITIALIZE(klog_lock);
  63.  
  64. static irq_t klog_irq;
  65.  
  66. static irq_ownership_t klog_claim(void);
  67.  
  68. /** Initialize kernel logging facility
  69.  *
  70.  * Allocate pages that are to be shared with uspace for console data.
  71.  * The shared area is a circular buffer. Userspace application may
  72.  * be notified on new data with indication of position and size
  73.  * of the data within the circular buffer.
  74.  */
  75. void klog_init(void)
  76. {
  77.     void *faddr;
  78.  
  79.     faddr = frame_alloc(KLOG_ORDER, FRAME_ATOMIC);
  80.     if (!faddr)
  81.         panic("Cannot allocate page for klog");
  82.     klog = (char *) PA2KA(faddr);
  83.    
  84.     devno_t devno = device_assign_devno();
  85.    
  86.     klog_parea.pbase = (uintptr_t) faddr;
  87.     klog_parea.vbase = (uintptr_t) klog;
  88.     klog_parea.frames = 1 << KLOG_ORDER;
  89.     klog_parea.cacheable = true;
  90.     ddi_parea_register(&klog_parea);
  91.  
  92.     sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
  93.     sysinfo_set_item_val("klog.pages", NULL, 1 << KLOG_ORDER);
  94.     sysinfo_set_item_val("klog.devno", NULL, devno);
  95.     sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
  96.  
  97.     irq_initialize(&klog_irq);
  98.     klog_irq.devno = devno;
  99.     klog_irq.inr = KLOG_VIRT_INR;
  100.     klog_irq.claim = klog_claim;
  101.     irq_register(&klog_irq);
  102.  
  103.     klogsize = PAGE_SIZE << KLOG_ORDER;
  104.     klogpos = 0;
  105. }
  106.  
  107. /** Allways refuse IRQ ownership.
  108.  *
  109.  * This is not a real IRQ, so we always decline.
  110.  *
  111.  * @return Always returns IRQ_DECLINE.
  112.  */
  113. irq_ownership_t klog_claim(void)
  114. {
  115.     return IRQ_DECLINE;
  116. }
  117.  
  118. static void klog_vprintf(const char *fmt, va_list args)
  119. {
  120.     int ret;
  121.     va_list atst;
  122.  
  123.     va_copy(atst, args);
  124.     spinlock_lock(&klog_lock);
  125.  
  126.     ret = vsnprintf(klog+klogpos, klogsize-klogpos, fmt, atst);
  127.     if (ret >= klogsize-klogpos) {
  128.         klogpos = 0;
  129.         if (ret >= klogsize)
  130.             goto out;
  131.     }
  132.     ipc_irq_send_msg(&klog_irq, klogpos, ret, 0);
  133.     klogpos += ret;
  134.     if (klogpos >= klogsize)
  135.         klogpos = 0;
  136. out:
  137.     spinlock_unlock(&klog_lock);
  138.     va_end(atst);
  139. }
  140.  
  141. /** Printf a message to kernel-uspace log */
  142. void klog_printf(const char *fmt, ...)
  143. {
  144.     va_list args;
  145.    
  146.     va_start(args, fmt);
  147.    
  148.     klog_vprintf(fmt, args);
  149.  
  150.     va_end(args);
  151. }
  152.  
  153. /** @}
  154.  */
  155.