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      1 /* Copyright (C) 2007-2008 The Android Open Source Project
      2 **
      3 ** This software is licensed under the terms of the GNU General Public
      4 ** License version 2, as published by the Free Software Foundation, and
      5 ** may be copied, distributed, and modified under those terms.
      6 **
      7 ** This program is distributed in the hope that it will be useful,
      8 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
      9 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     10 ** GNU General Public License for more details.
     11 */
     12 #include "android/hw-kmsg.h"
     13 #include "qemu-char.h"
     14 #include "charpipe.h"
     15 #include "android/utils/debug.h"
     16 
     17 static CharDriverState*  android_kmsg_cs;
     18 
     19 typedef struct {
     20     CharDriverState*  cs;
     21     AndroidKmsgFlags  flags;
     22 } KernelLog;
     23 
     24 static int
     25 kernel_log_can_read( void*  opaque )
     26 {
     27     return 1024;
     28 }
     29 
     30 static void
     31 kernel_log_read( void*  opaque, const uint8_t*  from, int  len )
     32 {
     33     KernelLog*  k = opaque;
     34 
     35     if (k->flags & ANDROID_KMSG_PRINT_MESSAGES)
     36         printf( "%.*s", len, (const char*)from );
     37 
     38     /* XXXX: TODO: save messages into in-memory buffer for later retrieval */
     39 }
     40 
     41 static void
     42 kernel_log_init( KernelLog*  k, AndroidKmsgFlags  flags )
     43 {
     44     if ( qemu_chr_open_charpipe( &k->cs, &android_kmsg_cs ) < 0 ) {
     45         derror( "could not create kernel log charpipe" );
     46         exit(1);
     47     }
     48 
     49     qemu_chr_add_handlers( k->cs, kernel_log_can_read, kernel_log_read, NULL, k );
     50 
     51     k->flags = flags;
     52 }
     53 
     54 static KernelLog  _kernel_log[1];
     55 
     56 void
     57 android_kmsg_init( AndroidKmsgFlags  flags )
     58 {
     59     if (_kernel_log->cs == NULL)
     60         kernel_log_init( _kernel_log, flags );
     61 }
     62 
     63 
     64 CharDriverState*  android_kmsg_get_cs( void )
     65 {
     66     if (android_kmsg_cs == NULL) {
     67         android_kmsg_init(0);
     68     }
     69     return android_kmsg_cs;
     70 }
     71