xnu-123.5.tar.gz

[apple/xnu.git] / pexpert / i386 / pe_kprintf.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * file: pe_kprintf.c
 *    i386 platform expert debugging output initialization.
 */
#include <stdarg.h>
#include <pexpert/pexpert.h>
#include <kern/debug.h>

/* extern references */
extern void cnputc(char c);

/* Globals */
void (*PE_kputc)(char c) = 0;

unsigned int disableSerialOuput = TRUE;

void PE_init_kprintf(boolean_t vm_initialized)
{
	unsigned int	boot_arg;

	if (PE_state.initialized == FALSE)
		panic("Platform Expert not initialized");

	if (!vm_initialized)
	{
	    if (PE_parse_boot_arg("debug", &boot_arg)) 
	        if (boot_arg & DB_KPRT) disableSerialOuput = FALSE;
        
        /* FIXME - route output to serial port. */
        PE_kputc = cnputc;
    }
}

void kprintf(const char *fmt, ...)
{
	va_list listp;
    
    if (!disableSerialOuput) {
        va_start(listp, fmt);
        _doprnt(fmt, &listp, PE_kputc, 16);
        va_end(listp);
    }
}