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disable irq in kpanic()

/*  $Id: printf.c,v 1.2 2007/11/23 13:12:57 nbrk Exp $ */
/*	$OpenBSD: printf.c,v 1.24 2006/09/18 21:11:50 mpf Exp $	*/
/*	$NetBSD: printf.c,v 1.10 1996/11/30 04:19:21 gwr Exp $	*/

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)printf.c	8.1 (Berkeley) 6/11/93
 */

/*
 * Scaled down version of printf(3).
 *
 * One additional format:
 *
 * The format %b is supported to decode error registers.
 * Its usage is:
 *
 *	printf("reg=%b\n", regval, "<base><arg>*");
 *
 * where <base> is the output base expressed as a control character, e.g.
 * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
 * the first of which gives the bit number to be inspected (origin 1), and
 * the next characters (up to a control character, i.e. a character <= 32),
 * give the name of the register.  Thus:
 *
 *	printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 *
 * would produce output:
 *
 *	reg=3<BITTWO,BITONE>
 */

#include <sys/types.h>
#include <sys/stdarg.h>

#include <dev/cpuvar.h> /* __cpu_disable_irq() for kpanic() */
#include <libkern/printf.h>


void kdoprnt(void (*)(char), const char *, va_list);
void kprintn(void (*put)(char), unsigned long ul, int base);

const char hexdig[] = "0123456789abcdef";

/*
 * putchar function; usually gets xxx_early_putc at startup and then gets fcons_putc after fcons attachment.
 */
void (*putchar)(char);


void
kpanic(const char *fmt, ...)
{
	/*
	 * System panic. Just disables interrupts, prints alarm message and spins off forever.
	 */
	va_list ap;

	__cpu_disable_irq();

	putchar('\n');
	putchar('S');
	putchar('Y');
	putchar('S');
	putchar('T');
	putchar('E');
	putchar('M');
	putchar(' ');
	putchar('P');
	putchar('A');
	putchar('N');
	putchar('I');
	putchar('C');
	putchar(' ');
	putchar(':');
	putchar(' ');

	va_start(ap, fmt);
	kdoprnt(putchar, fmt, ap);
	va_end(ap);

	while(1)
		;
	/* NOTREACHED */
}


void
printf(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	kdoprnt(putchar, fmt, ap);
	va_end(ap);
}

void
kdoprnt(void (*put)(char), const char *fmt, va_list ap)
{
#ifdef LIBSA_LONGLONG_PRINTF
	u_int64_t ull;
#endif
	unsigned long ul;
	int ch, lflag;
	char *p;

	for (;;) {
		while ((ch = *fmt++) != '%') {
			if (ch == '\0')
				return;
			put(ch);
		}
		lflag = 0;
reswitch:	switch (ch = *fmt++) {
		case 'l':
			lflag++;
			goto reswitch;
#ifndef	STRIPPED
		case 'b':
		{
			int set, n;

			ul = va_arg(ap, int);
			p = va_arg(ap, char *);
			kprintn(put, ul, *p++);

			if (!ul)
				break;

			for (set = 0; (n = *p++);) {
				if (ul & (1 << (n - 1))) {
					put(set ? ',' : '<');
					for (; (n = *p) > ' '; ++p)
						put(n);
					set = 1;
				} else
					for (; *p > ' '; ++p)
						;
			}
			if (set)
				put('>');
		}
			break;
#endif
		case 'c':
			ch = va_arg(ap, int);
			put(ch & 0x7f);
			break;
		case 's':
			p = va_arg(ap, char *);
			while ((ch = *p++))
				put(ch);
			break;
		case 'd':
#ifdef LIBSA_LONGLONG_PRINTF
			if (lflag > 1) {
				ull = va_arg(ap, int64_t);
				if ((int64_t)ull < 0) {
					put('-');
					ull = -(int64_t)ull;
				}
				kprintn64(put, ull, 10);
				break;
			} 
#endif
			ul = lflag ?
			    va_arg(ap, long) : va_arg(ap, int);
			if ((long)ul < 0) {
				put('-');
				ul = -(long)ul;
			}
			kprintn(put, ul, 10);
			break;
		case 'o':
#ifdef LIBSA_LONGLONG_PRINTF
			if (lflag > 1) {
				ull = va_arg(ap, u_int64_t);
				kprintn64(put, ull, 8);
				break;
			} 
#endif
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(put, ul, 8);
			break;
		case 'u':
#ifdef LIBSA_LONGLONG_PRINTF
			if (lflag > 1) {
				ull = va_arg(ap, u_int64_t);
				kprintn64(put, ull, 10);
				break;
			} 
#endif
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(put, ul, 10);
			break;
		case 'p':
			put('0');
			put('x');
			lflag += sizeof(void *)==sizeof(u_long)? 1 : 0;
		case 'x':
#ifdef LIBSA_LONGLONG_PRINTF
			if (lflag > 1) {
				ull = va_arg(ap, u_int64_t);
				kprintn64(put, ull, 16);
				break;
			}
#else
 			if (lflag > 1) {
				/* hold an int64_t in base 16 */
				char *p, buf[(sizeof(u_int64_t) * 8 / 4) + 1];
				u_int64_t ull;

 				ull = va_arg(ap, u_int64_t);
				p = buf;
				do {
					*p++ = hexdig[ull & 15];
				} while (ull >>= 4);
				do {
					put(*--p);
				} while (p > buf);
 				break;
 			}
#endif
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(put, ul, 16);
			break;
		default:
			put('%');
#ifdef LIBSA_LONGLONG_PRINTF
			while (--lflag)
#else
			if (lflag)
#endif
				put('l');
			put(ch);
		}
	}
	va_end(ap);
}


void
kprintn(void (*put)(char), unsigned long ul, int base)
{
	/* hold a long in base 8 */
	char *p, buf[(sizeof(long) * 8 / 3) + 1];

	p = buf;
	do {
		*p++ = hexdig[ul % base];
	} while (ul /= base);
	do {
		put(*--p);
	} while (p > buf);
}