osfmk/i386/i386_lowmem.h

   1 /*
   2  * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _I386_LOWMEM_H_
  30 #define _I386_LOWMEM_H_
  31
  32
  33 #ifdef __APPLE_API_PRIVATE
  34
  35 /* The kernel is linked at VM_MIN_KERNEL_ADDRESS + 0x100000 */
  36 #define I386_KERNEL_IMAGE_BASE_PAGE     0x100
  37
  38 #if defined(__i386__)
  39 #define I386_LOWMEM_RESERVED            0x18
  40
  41 #define I386_HIB_PAGETABLE              0x13
  42 #define I386_HIB_PAGETABLE_COUNT        5
  43
  44 #elif defined(__x86_64__)
  45 /* For K64, only 3 pages are reserved
  46  * - physical page zero, a gap page, and then real-mode-bootstrap/lowGlo.
  47  * Note that the kernel virtual address 0xffffff8000002000 is re-mapped
  48  * to the low globals and that physical page, 0x2000, is used by the bootstrap.
  49  */
  50 #define I386_LOWMEM_RESERVED            3
  51 #endif
  52
  53 #endif /* __APPLE_API_PRIVATE */
  54
  55 #endif /* !_I386_LOWMEM_H_ */