osfmk/i386/idle_pt.c

   1 /*
   2  * Copyright (c) 2008 Apple 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 #include <i386/pmap.h>
  29
  30 pml4_entry_t            IdlePML4[PTE_PER_PAGE] __attribute__((section("__INITPT, __data"))) = {
  31 #ifdef __x86_64__
  32                 [  0] = ((uint64_t)(INITPT_SEG_BASE + PAGE_SIZE) | INTEL_PTE_VALID | INTEL_PTE_WRITE),
  33                 [KERNEL_PML4_INDEX] = ((uint64_t)(INITPT_SEG_BASE + PAGE_SIZE) | INTEL_PTE_VALID | INTEL_PTE_WRITE),
  34 #endif
  35         };
  36
  37 #if defined(__x86_64__)
  38 #define PDPT_PROT (INTEL_PTE_VALID | INTEL_PTE_WRITE)
  39 #elif defined(__i386__)
  40 #define PDPT_PROT (INTEL_PTE_VALID)
  41 #endif
  42 pdpt_entry_t            IdlePDPT[PTE_PER_PAGE] __attribute__((section("__INITPT, __data"))) = {
  43                 [0] = ((uint64_t)(INITPT_SEG_BASE + 2*PAGE_SIZE) | PDPT_PROT),
  44                 [1] = ((uint64_t)(INITPT_SEG_BASE + 3*PAGE_SIZE) | PDPT_PROT),
  45                 [2] = ((uint64_t)(INITPT_SEG_BASE + 4*PAGE_SIZE) | PDPT_PROT),
  46                 [3] = ((uint64_t)(INITPT_SEG_BASE + 5*PAGE_SIZE) | PDPT_PROT),
  47         };
  48
  49 #if NPGPTD != 4
  50 #error Please update idle_pt.c to reflect the new value of NPGPTD
  51 #endif
  52
  53 #define ID_MAP_2MEG(x) [(x)] = ((((uint64_t)(x)) << 21) | (INTEL_PTE_PS | INTEL_PTE_VALID | INTEL_PTE_WRITE)),
  54
  55 #define L0(x,n) x(n)
  56 #define L1(x,n) L0(x,n-1)   L0(x,n)
  57 #define L2(x,n) L1(x,n-2)   L1(x,n)
  58 #define L3(x,n) L2(x,n-4)   L2(x,n)
  59 #define L4(x,n) L3(x,n-8)   L3(x,n)
  60 #define L5(x,n) L4(x,n-16)  L4(x,n)
  61 #define L6(x,n) L5(x,n-32)  L5(x,n)
  62 #define L7(x,n) L6(x,n-64)  L6(x,n)
  63 #define L8(x,n) L7(x,n-128) L7(x,n)
  64 #define L9(x,n) L8(x,n-256) L8(x,n)
  65 #define L10(x,n) L9(x,n-512) L9(x,n)
  66 #define L11(x,n) L10(x,n-1024) L10(x,n)
  67
  68 #define FOR_0_TO_2047(x) L11(x,2047)
  69
  70 pd_entry_t              BootstrapPTD[2048] __attribute__((section("__INITPT, __data"))) = {
  71         FOR_0_TO_2047(ID_MAP_2MEG)
  72 };