i386/libsa/memory.h

   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 #ifndef __BOOT_MEMORY_H
  27 #define __BOOT_MEMORY_H
  28
  29 /* Memory addresses used by booter and friends */
  30
  31 #define BASE_SEG          0x2000
  32 #define STACK_SEG         0x3000
  33 #define STACK_OFS         0xFFF0      // stack pointer
  34
  35 #define BOOT1U_SEG        0x1000
  36 #define BOOT1U_OFS        0x0200
  37
  38 #define BOOT2_SEG         BASE_SEG
  39 #define BOOT2_OFS         0x0200      // 512 byte disk sector offset
  40
  41 #define BIOS_ADDR         0x0C00      // BIOS disk I/O buffer
  42 #define BIOS_LEN          0x2000      // 8K - divisible by 512 and 2048
  43
  44 /* These are all "virtual" addresses...
  45  * which are physical addresses plus MEMBASE.
  46  */
  47 #define ADDR32(seg, ofs)  (((seg) << 4 ) + (ofs))
  48
  49 #define MEMBASE           0x0
  50
  51 #define BOOTSTRUCT_ADDR   0x011000    // it's slightly smaller
  52 #define BOOTSTRUCT_LEN    0x00F000
  53
  54 #define BASE_ADDR         ADDR32(BASE_SEG, 0)
  55 #define BASE1U_ADDR       ADDR32(BOOT1U_SEG, 0)
  56 #define BOOT1U_ADDR       ADDR32(BOOT1U_SEG, BOOT1U_OFS)
  57 #define BOOT2_ADDR        ADDR32(BOOT2_SEG, BOOT2_OFS)
  58
  59 #define VIDEO_ADDR        0x0A0000    // unusable space
  60 #define VIDEO_LEN         0x060000
  61
  62 #define KERNEL_ADDR       0x0100000   // 64M kernel + drivers
  63 #define KERNEL_LEN        0x4000000
  64
  65 #define ZALLOC_ADDR       0x4100000   // 47M zalloc area
  66 #define ZALLOC_LEN        0x2F00000
  67
  68 #define LOAD_ADDR         0x7000000   // 16M File load buffer
  69 #define LOAD_LEN          0x1000000
  70
  71 #define TFTP_ADDR         LOAD_ADDR   // tftp download buffer
  72 #define TFTP_LEN          LOAD_LEN
  73
  74 #define kLoadAddr         LOAD_ADDR
  75 #define kLoadSize         LOAD_LEN
  76
  77 #define CONVENTIONAL_LEN  0x0A0000    // 640k
  78 #define EXTENDED_ADDR     0x100000    // 1024k
  79
  80 #define ptov(paddr)       ((paddr) - MEMBASE)
  81 #define vtop(vaddr)       ((vaddr) + MEMBASE)
  82
  83 /*
  84  * Extract segment/offset from a linear address.
  85  */
  86 #define OFFSET16(addr)    ((addr) - BASE_ADDR)
  87 #define OFFSET1U16(addr)  ((addr) - BASE1U_ADDR)
  88 #define OFFSET(addr)      ((addr) & 0xFFFF)
  89 #define SEGMENT(addr)     (((addr) & 0xF0000) >> 4)
  90
  91 /*
  92  * We need a minimum of 32MB of system memory.
  93  */
  94 #define MIN_SYS_MEM_KB  (32 * 1024)
  95
  96 /*
  97  * The number of descriptor entries in the GDT.
  98  */
  99 #define NGDTENT   7
 100
 101 /*
 102  * The total size of the GDT in bytes.
 103  * Each descriptor entry require 8 bytes.
 104  */
 105 #define GDTLIMIT  ( NGDTENT * 8 )
 106
 107 #endif /* !__BOOT_MEMORY_H */