pexpert/i386/pe_kprintf.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * file: pe_kprintf.c
  27  *    i386 platform expert debugging output initialization.
  28  */
  29 #include <stdarg.h>
  30 #include <pexpert/pexpert.h>
  31 #include <kern/debug.h>
  32
  33 /* extern references */
  34 extern void cnputc(char c);
  35
  36 /* Globals */
  37 void (*PE_kputc)(char c) = 0;
  38
  39 unsigned int disableSerialOuput = TRUE;
  40
  41 void PE_init_kprintf(boolean_t vm_initialized)
  42 {
  43         unsigned int    boot_arg;
  44
  45         if (PE_state.initialized == FALSE)
  46                 panic("Platform Expert not initialized");
  47
  48         if (!vm_initialized)
  49         {
  50             if (PE_parse_boot_arg("debug", &boot_arg))
  51                 if (boot_arg & DB_KPRT) disableSerialOuput = FALSE;
  52
  53         /* FIXME - route output to serial port. */
  54         PE_kputc = cnputc;
  55     }
  56 }
  57
  58 void kprintf(const char *fmt, ...)
  59 {
  60         va_list listp;
  61
  62     if (!disableSerialOuput) {
  63         va_start(listp, fmt);
  64         _doprnt(fmt, &listp, PE_kputc, 16);
  65         va_end(listp);
  66     }
  67 }