i386/libsaio/bootstruct.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright 1993 NeXT, Inc.
  27  * All rights reserved.
  28  */
  29
  30 #include "libsaio.h"
  31 #include "bootstruct.h"
  32
  33 // CMOS access ports in I/O space.
  34 //
  35 #define CMOSADDR    0x70
  36 #define CMOSDATA    0x71
  37 #define HDTYPE      0x12
  38
  39 /*==========================================================================
  40  * Returns the number of active ATA drives since these will increment the
  41  * bios device numbers of SCSI drives.
  42  */
  43 static int countIDEDisks()
  44 {
  45     int            count = 0;
  46     unsigned short hdtype;
  47
  48 #if DEBUG
  49     struct driveParameters param;
  50
  51     printf("Reading drive parameters...\n");
  52     readDriveParameters(0x80, &param);
  53     printf("%d fixed disk drive(s) installed\n", param.totalDrives);
  54     for (count = 0; count < 256; count++)
  55     {
  56         if (readDriveParameters(count + 0x80, &param))
  57             break;
  58         else
  59         {
  60             printf("Drive %d: %d cyls, %d heads, %d sectors\n",
  61                    count, param.cylinders, param.heads, param.sectors);
  62         }
  63     }
  64     outb(CMOSADDR, 0x11);
  65     printf("CMOS addr 0x11 = %x\n",inb(CMOSDATA));
  66     outb(CMOSADDR, 0x12);
  67     printf("CMOS addr 0x12 = %x\n",inb(CMOSDATA));
  68     return count;
  69 #endif
  70
  71     outb( CMOSADDR, HDTYPE );
  72     hdtype = (unsigned short) inb( CMOSDATA );
  73
  74     if (hdtype & 0xF0) count++;
  75     if (hdtype & 0x0F) count++;
  76     return count;
  77 }
  78
  79 /*==========================================================================
  80  * Initialize the 'kernBootStruct'. A structure of parameters passed to
  81  * the kernel by the booter.
  82  */
  83
  84 KernelBootArgs_t *bootArgs;
  85
  86 void initKernBootStruct( int biosdev )
  87 {
  88     static int init_done = 0;
  89
  90     bootArgs = (KernelBootArgs_t *)KERNSTRUCT_ADDR;
  91
  92     if ( !init_done )
  93     {
  94         bzero(bootArgs, sizeof(KernelBootArgs_t));
  95
  96         // Get system memory map. Also update the size of the
  97         // conventional/extended memory for backwards compatibility.
  98
  99         bootArgs->memoryMapCount =
 100             getMemoryMap( bootArgs->memoryMap, kMemoryMapCountMax,
 101                           (unsigned long *) &bootArgs->convmem,
 102                           (unsigned long *) &bootArgs->extmem );
 103
 104         if ( bootArgs->memoryMapCount == 0 )
 105         {
 106             // BIOS did not provide a memory map, systems with
 107             // discontiguous memory or unusual memory hole locations
 108             // may have problems.
 109
 110             bootArgs->convmem = getConventionalMemorySize();
 111             bootArgs->extmem  = getExtendedMemorySize();
 112         }
 113
 114         bootArgs->magicCookie  = KERNBOOTMAGIC;
 115         bootArgs->configEnd    = bootArgs->config;
 116         bootArgs->graphicsMode = TEXT_MODE;
 117
 118         /* New style */
 119         /* XXX initialize bootArgs here */
 120
 121         init_done = 1;
 122     }
 123
 124     // Get number of ATA devices.
 125
 126     bootArgs->numDrives = countIDEDisks();
 127
 128     // Update kernDev from biosdev.
 129
 130     bootArgs->kernDev = biosdev;
 131 }
 132
 133
 134 /* Copy boot args after kernel and record address. */
 135
 136 void
 137 reserveKernBootStruct(void)
 138 {
 139     void *oldAddr = bootArgs;
 140     bootArgs = (KernelBootArgs_t *)AllocateKernelMemory(sizeof(KERNBOOTSTRUCT));
 141     bcopy(oldAddr, bootArgs, sizeof(KernelBootArgs_t));
 142 }
 143