i386/libsa/memory.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 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 1.1 (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 #ifndef __BOOT_MEMORY_H
  26 #define __BOOT_MEMORY_H
  27
  28 /* Memory addresses used by booter and friends */
  29
  30 #define BASE_SEG          0x2000
  31 #define STACK_SEG         0x3000
  32 #define STACK_OFS         0xFFF0      // stack pointer
  33
  34 #define BOOT1U_SEG        0x1000
  35 #define BOOT1U_OFS        0x0200
  36
  37 #define BOOT2_SEG         BASE_SEG
  38 #define BOOT2_OFS         0x0200      // 512 byte disk sector offset
  39
  40 #define BIOS_ADDR         0x0C00      // BIOS disk I/O buffer
  41 #define BIOS_LEN          0x2000      // 8K - divisible by 512 and 2048
  42
  43 /* These are all "virtual" addresses...
  44  * which are physical addresses plus MEMBASE.
  45  */
  46 #define ADDR32(seg, ofs)  (((seg) << 4 ) + (ofs))
  47
  48 #define MEMBASE           0x0
  49
  50 #define BOOTSTRUCT_ADDR   0x011000    // it's slightly smaller
  51 #define BOOTSTRUCT_LEN    0x00F000
  52
  53 #define BASE_ADDR         ADDR32(BASE_SEG, 0)
  54 #define BASE1U_ADDR       ADDR32(BOOT1U_SEG, 0)
  55 #define BOOT1U_ADDR       ADDR32(BOOT1U_SEG, BOOT1U_OFS)
  56 #define BOOT2_ADDR        ADDR32(BOOT2_SEG, BOOT2_OFS)
  57
  58 #define VIDEO_ADDR        0x0A0000    // unusable space
  59 #define VIDEO_LEN         0x060000
  60
  61 #define KERNEL_ADDR       0x0100000   // 64M kernel + drivers
  62 #define KERNEL_LEN        0x4000000
  63
  64 #define ZALLOC_ADDR       0x4100000   // 47M zalloc area
  65 #define ZALLOC_LEN        0x2F00000
  66
  67 #define LOAD_ADDR         0x7000000   // 16M File load buffer
  68 #define LOAD_LEN          0x1000000
  69
  70 #define TFTP_ADDR         LOAD_ADDR   // tftp download buffer
  71 #define TFTP_LEN          LOAD_LEN
  72
  73 #define kLoadAddr         LOAD_ADDR
  74 #define kLoadSize         LOAD_LEN
  75
  76 #define CONVENTIONAL_LEN  0x0A0000    // 640k
  77 #define EXTENDED_ADDR     0x100000    // 1024k
  78
  79 #define ptov(paddr)       ((paddr) - MEMBASE)
  80 #define vtop(vaddr)       ((vaddr) + MEMBASE)
  81
  82 /*
  83  * Extract segment/offset from a linear address.
  84  */
  85 #define OFFSET16(addr)    ((addr) - BASE_ADDR)
  86 #define OFFSET1U16(addr)  ((addr) - BASE1U_ADDR)
  87 #define OFFSET(addr)      ((addr) & 0xFFFF)
  88 #define SEGMENT(addr)     (((addr) & 0xF0000) >> 4)
  89
  90 /*
  91  * We need a minimum of 32MB of system memory.
  92  */
  93 #define MIN_SYS_MEM_KB  (32 * 1024)
  94
  95 /*
  96  * The number of descriptor entries in the GDT.
  97  */
  98 #define NGDTENT   7
  99
 100 /*
 101  * The total size of the GDT in bytes.
 102  * Each descriptor entry require 8 bytes.
 103  */
 104 #define GDTLIMIT  ( NGDTENT * 8 )
 105
 106 #endif /* !__BOOT_MEMORY_H */