text: //
  //  boot.h
  //  BetaOS
  //
  //  Created by Adam Kopeć on 4/29/16.
  //  Copyright © 2016 Adam Kopeć. All rights reserved.
  //
  
  #include <i386/pmap.h>
  
  /*
   * These pagetables are used during early processor startup during
   * the transition from protected mode to 64-bit mode and the jump
   * to high kernel address space.
   *
   * They are required to be at the base of the kernel and specifically
   * the base of the special __HIB section.
   *
   * These tables are statically-defined as physical-zero-based.
   * Startup code in start.s rebases these according to the actual physical
   * base address.
   */
  
  /*
   * NB: This must be located at the kernel's base address!
   */
  #define PML4_PROT (INTEL_PTE_VALID | INTEL_PTE_WRITE)
  pml4_entry_t	BootPML4[PTE_PER_PAGE]
  #ifndef __ELF__
  __attribute__((section("__HIB, __bootPT"))) = {
  #else
  __attribute__((section(".data"))) = {
  #endif
  	[0]			= ((uint64_t)(PAGE_SIZE) | PML4_PROT),
  	[KERNEL_PML4_INDEX]	= ((uint64_t)(PAGE_SIZE) | PML4_PROT),
  };
  
  #define PDPT_PROT (INTEL_PTE_VALID | INTEL_PTE_WRITE)
  pdpt_entry_t	BootPDPT[PTE_PER_PAGE]
  #ifndef __ELF__
  __attribute__((section("__HIB, __bootPT"))) = {
  #else
  __attribute__((section(".data"))) = {
  #endif
  	[0]	= ((uint64_t)(2*PAGE_SIZE) | PDPT_PROT),
  	[1]	= ((uint64_t)(3*PAGE_SIZE) | PDPT_PROT),
  	[2]	= ((uint64_t)(4*PAGE_SIZE) | PDPT_PROT),
  	[3]	= ((uint64_t)(5*PAGE_SIZE) | PDPT_PROT),
  };
  
  #if NPGPTD != 4
  #error Please update boot_pt.c to reflect the new value of NPGPTD
  #endif
  
  //#if MACHINE_BOOTSTRAPPTD
  
  #define PDT_PROT (INTEL_PTE_PS | INTEL_PTE_VALID | INTEL_PTE_WRITE)
  #define ID_MAP_2MEG(x)	[(x)] = ((((uint64_t)(x)) << 21) | (PDT_PROT)),
  
  #define L0(x,n)	 x(n)
  #define L1(x,n)	 L0(x,n-1)     L0(x,n)
  #define L2(x,n)  L1(x,n-2)     L1(x,n)
  #define L3(x,n)  L2(x,n-4)     L2(x,n)
  #define L4(x,n)  L3(x,n-8)     L3(x,n)
  #define L5(x,n)  L4(x,n-16)    L4(x,n)
  #define L6(x,n)  L5(x,n-32)    L5(x,n)
  #define L7(x,n)  L6(x,n-64)    L6(x,n)
  #define L8(x,n)  L7(x,n-128)   L7(x,n)
  #define L9(x,n)  L8(x,n-256)   L8(x,n)
  #define L10(x,n) L9(x,n-512)   L9(x,n)
  #define L11(x,n) L10(x,n-1024) L10(x,n)
  
  #define FOR_0_TO_2047(x) L11(x,2047)
  
  pd_entry_t	BootPTD[2048]
  #ifndef __ELF__
  __attribute__((section("__HIB, __bootPT"))) = {
  #else
  __attribute__((section(".data"))) = {
  #endif
  	FOR_0_TO_2047(ID_MAP_2MEG)
  };
  //#endif /* MACHINE_BOOTSTRAPPTD */
  