i386/libsaio/bootstruct.c

   1 /*
   2  * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999-2003 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  * Copyright 1993 NeXT, Inc.
  26  * All rights reserved.
  27  */
  28
  29 #include "libsaio.h"
  30 #include "bootstruct.h"
  31
  32 // CMOS access ports in I/O space.
  33 //
  34 #define CMOSADDR    0x70
  35 #define CMOSDATA    0x71
  36 #define HDTYPE      0x12
  37
  38 /*==========================================================================
  39  * Returns the number of active ATA drives since these will increment the
  40  * bios device numbers of SCSI drives.
  41  */
  42 static int countIDEDisks()
  43 {
  44     int            count = 0;
  45     unsigned short hdtype;
  46
  47 #if DEBUG
  48     struct driveParameters param;
  49
  50     printf("Reading drive parameters...\n");
  51     readDriveParameters(0x80, &param);
  52     printf("%d fixed disk drive(s) installed\n", param.totalDrives);
  53     for (count = 0; count < 256; count++)
  54     {
  55         if (readDriveParameters(count + 0x80, &param))
  56             break;
  57         else
  58         {
  59             printf("Drive %d: %d cyls, %d heads, %d sectors\n",
  60                    count, param.cylinders, param.heads, param.sectors);
  61         }
  62     }
  63     outb(CMOSADDR, 0x11);
  64     printf("CMOS addr 0x11 = %x\n",inb(CMOSDATA));
  65     outb(CMOSADDR, 0x12);
  66     printf("CMOS addr 0x12 = %x\n",inb(CMOSDATA));
  67     return count;
  68 #endif
  69
  70     outb( CMOSADDR, HDTYPE );
  71     hdtype = (unsigned short) inb( CMOSDATA );
  72
  73     if (hdtype & 0xF0) count++;
  74     if (hdtype & 0x0F) count++;
  75     return count;
  76 }
  77
  78 /*==========================================================================
  79  * Initialize the 'kernBootStruct'. A structure of parameters passed to
  80  * the kernel by the booter.
  81  */
  82
  83 KernelBootArgs_t *bootArgs;
  84
  85 void initKernBootStruct( int biosdev )
  86 {
  87     static int init_done = 0;
  88
  89     bootArgs = (KernelBootArgs_t *)KERNSTRUCT_ADDR;
  90
  91     if ( !init_done )
  92     {
  93         bzero(bootArgs, sizeof(KernelBootArgs_t));
  94
  95         // Get system memory map. Also update the size of the
  96         // conventional/extended memory for backwards compatibility.
  97
  98         bootArgs->memoryMapCount =
  99             getMemoryMap( bootArgs->memoryMap, kMemoryMapCountMax,
 100                           (unsigned long *) &bootArgs->convmem,
 101                           (unsigned long *) &bootArgs->extmem );
 102
 103         if ( bootArgs->memoryMapCount == 0 )
 104         {
 105             // BIOS did not provide a memory map, systems with
 106             // discontiguous memory or unusual memory hole locations
 107             // may have problems.
 108
 109             bootArgs->convmem = getConventionalMemorySize();
 110             bootArgs->extmem  = getExtendedMemorySize();
 111         }
 112
 113         bootArgs->magicCookie  = KERNBOOTMAGIC;
 114         bootArgs->configEnd    = bootArgs->config;
 115         bootArgs->graphicsMode = TEXT_MODE;
 116
 117         /* New style */
 118         /* XXX initialize bootArgs here */
 119
 120         init_done = 1;
 121     }
 122
 123     // Get number of ATA devices.
 124
 125     bootArgs->numDrives = countIDEDisks();
 126
 127     // Update kernDev from biosdev.
 128
 129     bootArgs->kernDev = biosdev;
 130 }
 131
 132
 133 /* Copy boot args after kernel and record address. */
 134
 135 void
 136 reserveKernBootStruct(void)
 137 {
 138     void *oldAddr = bootArgs;
 139     bootArgs = (KernelBootArgs_t *)AllocateKernelMemory(sizeof(KERNBOOTSTRUCT));
 140     bcopy(oldAddr, bootArgs, sizeof(KernelBootArgs_t));
 141 }
 142