i386/boot1u/boot.c

   1 /*
   2  * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 2002-2003 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 2.0 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <libsa.h>
  26 #include <libsa/memory.h>
  27 #include <saio_types.h>
  28 #include <saio_internal.h>
  29
  30 #include <fdisk.h>
  31 #include <ufs.h>
  32
  33 #include "boot1u.h"
  34 #include "disk.h"
  35
  36 #include <io_inline.h>
  37
  38 void *gFSLoadAddress;
  39
  40 //#define BOOT_FILE "/foo"
  41 #define BOOT_FILE "/usr/standalone/i386/boot"
  42
  43
  44 //==========================================================================
  45 // Zero the BSS.
  46
  47 static void zeroBSS()
  48 {
  49     extern char _DATA__bss__begin, _DATA__bss__end;
  50     extern char _DATA__common__begin, _DATA__common__end;
  51
  52     bzero( &_DATA__bss__begin,
  53            (&_DATA__bss__end - &_DATA__bss__begin) );
  54
  55     bzero( &_DATA__common__begin,
  56            (&_DATA__common__end - &_DATA__common__begin) );
  57 }
  58
  59 struct BootVolume bv;
  60
  61 extern char chainbootdev;
  62
  63 void boot(int biosdev, void *partPtr)
  64 {
  65     struct fdisk_part part;
  66     int cc;
  67
  68     zeroBSS();
  69
  70     // Enable A20 gate before accessing memory above 1Mb.
  71     enableA20();
  72
  73     biosdev = biosdev & 0xFF;
  74     chainbootdev = biosdev;
  75
  76     /* Don't believe the passed-in partition table */
  77     cc = findUFSPartition(biosdev, &part);
  78     if (cc<0) {
  79         printf("No UFS partition\n");
  80         halt();
  81     }
  82
  83     initUFSBVRef(&bv, biosdev, &part);
  84
  85     gFSLoadAddress = (void *)BOOT2_ADDR;
  86     cc = UFSLoadFile(&bv, BOOT_FILE);
  87     if (cc < 0) {
  88         printf("Could not load %s\n", BOOT_FILE);
  89         halt();
  90     }
  91     // Return to execute booter
  92 }