boot-132.tar.gz

[apple/boot.git] / i386 / boot1u / boot.c

/*
 * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Portions Copyright (c) 2002-2003 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 2.0 (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.
 * 
 * The 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@
 */

#include <libsa.h>
#include <libsa/memory.h>
#include <saio_types.h>
#include <saio_internal.h>

#include <fdisk.h>
#include <ufs.h>

#include "boot1u.h"
#include "disk.h"

#include <io_inline.h>

void *gFSLoadAddress;

//#define BOOT_FILE "/foo"
#define BOOT_FILE "/usr/standalone/i386/boot"


//==========================================================================
// Zero the BSS.

static void zeroBSS()
{
    extern char _DATA__bss__begin, _DATA__bss__end;
    extern char _DATA__common__begin, _DATA__common__end;

    bzero( &_DATA__bss__begin,
           (&_DATA__bss__end - &_DATA__bss__begin) );

    bzero( &_DATA__common__begin, 
           (&_DATA__common__end - &_DATA__common__begin) );
}

struct BootVolume bv;

extern char chainbootdev;

void boot(int biosdev, void *partPtr)
{
    struct fdisk_part part;
    int cc;

    zeroBSS();

    // Enable A20 gate before accessing memory above 1Mb.
    enableA20();

    biosdev = biosdev & 0xFF;
    chainbootdev = biosdev;

    /* Don't believe the passed-in partition table */
    cc = findUFSPartition(biosdev, &part);
    if (cc<0) {
	printf("No UFS partition\n");
	halt();
    }

    initUFSBVRef(&bv, biosdev, &part);

    gFSLoadAddress = (void *)BOOT2_ADDR;
    cc = UFSLoadFile(&bv, BOOT_FILE);
    if (cc < 0) {
	printf("Could not load %s\n", BOOT_FILE);
	halt();
    }
    // Return to execute booter
}