reactos/boot/freeldr/freeldr/arch/amd64/loader.c

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
   4  *  Copyright (C) 2005       Alex Ionescu  <alex@relsoft.net>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #define _NTSYSTEM_
  21 #include <freeldr.h>
  22
  23 #define NDEBUG
  24 #include <debug.h>
  25 #undef DbgPrint
  26
  27 /* Page Directory and Tables for non-PAE Systems */
  28 extern PAGE_DIRECTORY_X86 startup_pagedirectory;
  29 extern PAGE_DIRECTORY_X86 lowmem_pagetable;
  30 extern PAGE_DIRECTORY_X86 kernel_pagetable;
  31 extern PAGE_DIRECTORY_X86 hyperspace_pagetable;
  32 extern PAGE_DIRECTORY_X86 apic_pagetable;
  33 extern PAGE_DIRECTORY_X86 kpcr_pagetable;
  34 extern PAGE_DIRECTORY_X86 kuser_pagetable;
  35 extern ULONG_PTR KernelBase;
  36 extern ROS_KERNEL_ENTRY_POINT KernelEntryPoint;
  37 /* FUNCTIONS *****************************************************************/
  38
  39 /*++
  40  * FrLdrStartup
  41  * INTERNAL
  42  *
  43  *     Prepares the system for loading the Kernel.
  44  *
  45  * Params:
  46  *     Magic - Multiboot Magic
  47  *
  48  * Returns:
  49  *     None.
  50  *
  51  * Remarks:
  52  *     None.
  53  *
  54  *--*/
  55 VOID
  56 NTAPI
  57 FrLdrStartup(ULONG Magic)
  58 {
  59     ASSERT(FALSE);
  60 #if 0
  61     /* Disable Interrupts */
  62     _disable();
  63
  64     /* Re-initalize EFLAGS */
  65     Ke386EraseFlags();
  66
  67     /* Initialize the page directory */
  68     FrLdrSetupPageDirectory();
  69
  70     /* Initialize Paging, Write-Protection and Load NTOSKRNL */
  71     FrLdrSetupPae(Magic);
  72 #endif
  73 }
  74
  75 /*++
  76  * FrLdrSetupPae
  77  * INTERNAL
  78  *
  79  *     Configures PAE on a MP System, and sets the PDBR if it's supported, or if
  80  *     the system is UP.
  81  *
  82  * Params:
  83  *     Magic - Multiboot Magic
  84  *
  85  * Returns:
  86  *     None.
  87  *
  88  * Remarks:
  89  *     None.
  90  *
  91  *--*/
  92 VOID
  93 FASTCALL
  94 FrLdrSetupPae(ULONG Magic)
  95 {
  96 #if 0
  97     ULONG_PTR PageDirectoryBaseAddress = (ULONG_PTR)&startup_pagedirectory;
  98
  99     /* Set the PDBR */
 100     __writecr3(PageDirectoryBaseAddress);
 101
 102     /* Enable Paging and Write Protect*/
 103     __writecr0(__readcr0() | X86_CR0_PG | X86_CR0_WP);
 104
 105     /* Jump to Kernel */
 106     (*KernelEntryPoint)(Magic, &LoaderBlock);
 107 #endif
 108 }
 109
 110 /*++
 111  * FrLdrSetupPageDirectory
 112  * INTERNAL
 113  *
 114  *     Sets up the ReactOS Startup Page Directory.
 115  *
 116  * Params:
 117  *     None.
 118  *
 119  * Returns:
 120  *     None.
 121  *
 122  * Remarks:
 123  *     We are setting PDEs, but using the equvivalent (for our purpose) PTE structure.
 124  *     As such, please note that PageFrameNumber == PageEntryNumber.
 125  *
 126  *--*/
 127 VOID
 128 FASTCALL
 129 FrLdrSetupPageDirectory(VOID)
 130 {
 131 #if 0
 132     PPAGE_DIRECTORY_X86 PageDir;
 133     ULONG KernelPageTableIndex;
 134     ULONG i;
 135
 136     /* Get the Kernel Table Index */
 137     KernelPageTableIndex = KernelBase >> PDE_SHIFT;
 138
 139     /* Get the Startup Page Directory */
 140     PageDir = (PPAGE_DIRECTORY_X86)&startup_pagedirectory;
 141
 142     /* Set up the Low Memory PDE */
 143     PageDir->Pde[LowMemPageTableIndex].Valid = 1;
 144     PageDir->Pde[LowMemPageTableIndex].Write = 1;
 145     PageDir->Pde[LowMemPageTableIndex].PageFrameNumber = PaPtrToPfn(lowmem_pagetable);
 146
 147     /* Set up the Kernel PDEs */
 148     PageDir->Pde[KernelPageTableIndex].Valid = 1;
 149     PageDir->Pde[KernelPageTableIndex].Write = 1;
 150     PageDir->Pde[KernelPageTableIndex].PageFrameNumber = PaPtrToPfn(kernel_pagetable);
 151     PageDir->Pde[KernelPageTableIndex + 1].Valid = 1;
 152     PageDir->Pde[KernelPageTableIndex + 1].Write = 1;
 153     PageDir->Pde[KernelPageTableIndex + 1].PageFrameNumber = PaPtrToPfn(kernel_pagetable + 4096);
 154
 155     /* Set up the Startup PDE */
 156     PageDir->Pde[StartupPageTableIndex].Valid = 1;
 157     PageDir->Pde[StartupPageTableIndex].Write = 1;
 158     PageDir->Pde[StartupPageTableIndex].PageFrameNumber = PaPtrToPfn(startup_pagedirectory);
 159
 160     /* Set up the Hyperspace PDE */
 161     PageDir->Pde[HyperspacePageTableIndex].Valid = 1;
 162     PageDir->Pde[HyperspacePageTableIndex].Write = 1;
 163     PageDir->Pde[HyperspacePageTableIndex].PageFrameNumber = PaPtrToPfn(hyperspace_pagetable);
 164
 165     /* Set up the HAL PDE */
 166     PageDir->Pde[HalPageTableIndex].Valid = 1;
 167     PageDir->Pde[HalPageTableIndex].Write = 1;
 168     PageDir->Pde[HalPageTableIndex].PageFrameNumber = PaPtrToPfn(apic_pagetable);
 169
 170     /* Set up Low Memory PTEs */
 171     PageDir = (PPAGE_DIRECTORY_X86)&lowmem_pagetable;
 172     for (i=0; i<1024; i++)
 173     {
 174         PageDir->Pde[i].Valid = 1;
 175         PageDir->Pde[i].Write = 1;
 176         PageDir->Pde[i].Owner = 1;
 177         PageDir->Pde[i].PageFrameNumber = PaToPfn(i * PAGE_SIZE);
 178     }
 179
 180     /* Set up Kernel PTEs */
 181     PageDir = (PPAGE_DIRECTORY_X86)&kernel_pagetable;
 182     for (i=0; i<1536; i++)
 183     {
 184         PageDir->Pde[i].Valid = 1;
 185         PageDir->Pde[i].Write = 1;
 186         PageDir->Pde[i].PageFrameNumber = PaToPfn(KERNEL_BASE_PHYS + i * PAGE_SIZE);
 187     }
 188
 189     /* Setup APIC Base */
 190     PageDir = (PPAGE_DIRECTORY_X86)&apic_pagetable;
 191     PageDir->Pde[0].Valid = 1;
 192     PageDir->Pde[0].Write = 1;
 193     PageDir->Pde[0].CacheDisable = 1;
 194     PageDir->Pde[0].WriteThrough = 1;
 195     PageDir->Pde[0].PageFrameNumber = PaToPfn(HAL_BASE);
 196     PageDir->Pde[0x200].Valid = 1;
 197     PageDir->Pde[0x200].Write = 1;
 198     PageDir->Pde[0x200].CacheDisable = 1;
 199     PageDir->Pde[0x200].WriteThrough = 1;
 200     PageDir->Pde[0x200].PageFrameNumber = PaToPfn(HAL_BASE + KERNEL_BASE_PHYS);
 201
 202     /* Setup KUSER_SHARED_DATA Base */
 203     PageDir->Pde[0x1F0].Valid = 1;
 204     PageDir->Pde[0x1F0].Write = 1;
 205     PageDir->Pde[0x1F0].PageFrameNumber = 2;
 206
 207     /* Setup KPCR Base*/
 208     PageDir->Pde[0x1FF].Valid = 1;
 209     PageDir->Pde[0x1FF].Write = 1;
 210     PageDir->Pde[0x1FF].PageFrameNumber = 1;
 211
 212     /* Zero shared data */
 213     RtlZeroMemory((PVOID)(2 << MM_PAGE_SHIFT), PAGE_SIZE);
 214 #endif
 215 }
 216