i86pc/dboot/dboot_printf.c

	dboot_printf.c revision 843e19887f64dde75055cf8842fc4db2171eff45
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/machparam.h>
#include <sys/archsystm.h>
#include <sys/boot_console.h>
#include <sys/varargs.h>
#include "dboot_asm.h"
#include "dboot_printf.h"
#include "dboot_xboot.h"

#ifdef __xpv
#include <sys/hypervisor.h>
#endif

/*
 * This file provides simple output formatting via dboot_printf()
 */

static void do_dboot_printf(char *fmt, va_list args);

static char digits[] = "0123456789abcdef";

/*
 * Primitive version of panic, prints a message then resets the system
 */
void
dboot_panic(char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    do_dboot_printf(fmt, args);

    if (console == CONS_SCREEN_TEXT) {
        dboot_printf("Press any key to reboot\n");
        (void) bcons_getchar();
    }
    outb(0x64, 0xfe);   /* this resets the system, see pc_reset() */
    dboot_halt();       /* just in case */
}

/*
 * printf for boot code
 */
void
dboot_printf(char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    do_dboot_printf(fmt, args);
}


/*
 * output a string
 */
static void
dboot_puts(char *s)
{
    while (*s != 0) {
        bcons_putchar(*s);
        ++s;
    }
}

static void
dboot_putnum(uint64_t x, uint_t is_signed, uint8_t base)
{
    char buffer[64];    /* digits in reverse order */
    int i;

    if (is_signed && (int64_t)x < 0) {
        bcons_putchar('-');
        x = -x;
    }

    for (i  = -1; x != 0 && i <= 63; x /= base)
        buffer[++i] = digits[x - ((x / base) * base)];

    if (i < 0)
        buffer[++i] = '0';

    while (i >= 0)
        bcons_putchar(buffer[i--]);
}

/*
 * very primitive printf - only does %s, %d, %x, %lx, or %%
 */
static void
do_dboot_printf(char *fmt, va_list args)
{
    char *s;
    uint64_t x;
    uint8_t base;
    uint8_t size;
    uint_t is_signed = 1;

    if (fmt == NULL) {
        dboot_puts("dboot_printf(): 1st arg is NULL\n");
        return;
    }
    for (; *fmt; ++fmt) {
        if (*fmt != '%') {
            bcons_putchar(*fmt);
            continue;
        }

        size = 0;
again:
        ++fmt;
        switch (*fmt) {

        case '%':
            bcons_putchar(*fmt);
            break;

        case 'c':
            x = va_arg(args, int);
            bcons_putchar(x);
            break;

        case 's':
            s = va_arg(args, char *);
            if (s == NULL)
                dboot_puts("*NULL*");
            else
                dboot_puts(s);
            break;

        case 'p':
            x = va_arg(args, ulong_t);
            dboot_putnum(x, !is_signed, 16);
            break;

        case 'l':
            if (size == 0)
                size = sizeof (long);
            else if (size == sizeof (long))
                size = sizeof (long long);
            goto again;

        case 'd':
            if (size == 0)
                x = va_arg(args, int);
            else if (size == sizeof (long))
                x = va_arg(args, long);
            else
                x = va_arg(args, long long);
            dboot_putnum(x, is_signed, 10);
            break;

        case 'b':
            base = 2;
            goto unsigned_num;

        case 'o':
            base = 8;
            goto unsigned_num;

        case 'x':
            base = 16;
unsigned_num:
            if (size == 0)
                x = va_arg(args, uint_t);
            else if (size == sizeof (long))
                x = va_arg(args, ulong_t);
            else
                x = va_arg(args, unsigned long long);
            dboot_putnum(x, !is_signed, base);
            break;

        default:
            dboot_puts("dboot_printf(): unknown % escape\n");
        }
    }
}