diff options
Diffstat (limited to 'EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c')
| -rw-r--r-- | EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c b/EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c deleted file mode 100644 index 89b18c3..0000000 --- a/EdkModulePkg/Core/DxeIplPeim/Ia32/VirtualMemory.c +++ /dev/null @@ -1,168 +0,0 @@ -/*++
-
-Copyright (c) 2006, Intel Corporation
-All rights reserved. This program and the accompanying materials
-are licensed and made available under the terms and conditions of the BSD License
-which accompanies this distribution. The full text of the license may be found at
-http://opensource.org/licenses/bsd-license.php
-
-THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-Module Name:
- VirtualMemory.c
-
-Abstract:
-
- x64 Virtual Memory Management Services in the form of an IA-32 driver.
- Used to establish a 1:1 Virtual to Physical Mapping that is required to
- enter Long Mode (x64 64-bit mode).
-
- While we make a 1:1 mapping (identity mapping) for all physical pages
- we still need to use the MTRR's to ensure that the cachability attirbutes
- for all memory regions is correct.
-
- The basic idea is to use 2MB page table entries where ever possible. If
- more granularity of cachability is required then 4K page tables are used.
-
- References:
- 1) IA-32 Intel(R) Atchitecture Software Developer's Manual Volume 1:Basic Architecture, Intel
- 2) IA-32 Intel(R) Atchitecture Software Developer's Manual Volume 2:Instruction Set Reference, Intel
- 3) IA-32 Intel(R) Atchitecture Software Developer's Manual Volume 3:System Programmer's Guide, Intel
-
---*/
-
-#include "VirtualMemory.h"
-
-UINTN
-CreateIdentityMappingPageTables (
- VOID
- )
-/*++
-
-Routine Description:
-
- Allocates and fills in the Page Directory and Page Table Entries to
- establish a 1:1 Virtual to Physical mapping.
-
-Arguments:
-
- NumberOfProcessorPhysicalAddressBits - Number of processor address bits to use.
- Limits the number of page table entries
- to the physical address space.
-
-Returns:
-
- EFI_SUCCESS The 1:1 Virtual to Physical identity mapping was created
-
---*/
-{
- UINT8 PhysicalAddressBits;
- EFI_PHYSICAL_ADDRESS PageAddress;
- UINTN IndexOfPml4Entries;
- UINTN IndexOfPdpEntries;
- UINTN IndexOfPageDirectoryEntries;
- UINTN NumberOfPml4EntriesNeeded;
- UINTN NumberOfPdpEntriesNeeded;
- PAGE_MAP_AND_DIRECTORY_POINTER *PageMapLevel4Entry;
- PAGE_MAP_AND_DIRECTORY_POINTER *PageMap;
- PAGE_MAP_AND_DIRECTORY_POINTER *PageDirectoryPointerEntry;
- PAGE_TABLE_ENTRY *PageDirectoryEntry;
- UINTN TotalPagesNum;
- UINTN BigPageAddress;
- VOID *Hob;
-
- //
- // Get physical address bits supported from CPU HOB.
- //
- PhysicalAddressBits = 36;
-
- Hob = GetFirstHob (EFI_HOB_TYPE_CPU);
- if (Hob != NULL) {
- PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;
- }
-
- //
- // Calculate the table entries needed.
- //
- if (PhysicalAddressBits <= 39 ) {
- NumberOfPml4EntriesNeeded = 1;
- NumberOfPdpEntriesNeeded = 1 << (PhysicalAddressBits - 30);
- } else {
- NumberOfPml4EntriesNeeded = 1 << (PhysicalAddressBits - 39);
- NumberOfPdpEntriesNeeded = 512;
- }
-
- //
- // Pre-allocate big pages to avoid later allocations.
- //
- TotalPagesNum = (NumberOfPdpEntriesNeeded + 1) * NumberOfPml4EntriesNeeded + 1;
- BigPageAddress = (UINTN) AllocatePages (TotalPagesNum);
- ASSERT (BigPageAddress != 0);
-
- //
- // By architecture only one PageMapLevel4 exists - so lets allocate storage for it.
- //
- PageMap = (VOID *) BigPageAddress;
- BigPageAddress += EFI_PAGE_SIZE;
-
- PageMapLevel4Entry = PageMap;
- PageAddress = 0;
- for (IndexOfPml4Entries = 0; IndexOfPml4Entries < NumberOfPml4EntriesNeeded; IndexOfPml4Entries++, PageMapLevel4Entry++) {
- //
- // Each PML4 entry points to a page of Page Directory Pointer entires.
- // So lets allocate space for them and fill them in in the IndexOfPdpEntries loop.
- //
- PageDirectoryPointerEntry = (VOID *) BigPageAddress;
- BigPageAddress += EFI_PAGE_SIZE;
-
- //
- // Make a PML4 Entry
- //
- PageMapLevel4Entry->Uint64 = (UINT64)(UINTN)PageDirectoryPointerEntry;
- PageMapLevel4Entry->Bits.ReadWrite = 1;
- PageMapLevel4Entry->Bits.Present = 1;
-
- for (IndexOfPdpEntries = 0; IndexOfPdpEntries < NumberOfPdpEntriesNeeded; IndexOfPdpEntries++, PageDirectoryPointerEntry++) {
- //
- // Each Directory Pointer entries points to a page of Page Directory entires.
- // So allocate space for them and fill them in in the IndexOfPageDirectoryEntries loop.
- //
- PageDirectoryEntry = (VOID *) BigPageAddress;
- BigPageAddress += EFI_PAGE_SIZE;
-
- //
- // Fill in a Page Directory Pointer Entries
- //
- PageDirectoryPointerEntry->Uint64 = (UINT64)(UINTN)PageDirectoryEntry;
- PageDirectoryPointerEntry->Bits.ReadWrite = 1;
- PageDirectoryPointerEntry->Bits.Present = 1;
-
- for (IndexOfPageDirectoryEntries = 0; IndexOfPageDirectoryEntries < 512; IndexOfPageDirectoryEntries++, PageDirectoryEntry++, PageAddress += 0x200000) {
- //
- // Fill in the Page Directory entries
- //
- PageDirectoryEntry->Uint64 = (UINT64)PageAddress;
- PageDirectoryEntry->Bits.ReadWrite = 1;
- PageDirectoryEntry->Bits.Present = 1;
- PageDirectoryEntry->Bits.MustBe1 = 1;
-
- }
- }
- }
-
- //
- // For the PML4 entries we are not using fill in a null entry.
- // For now we just copy the first entry.
- //
- for (; IndexOfPml4Entries < 512; IndexOfPml4Entries++, PageMapLevel4Entry++) {
- CopyMem (
- PageMapLevel4Entry,
- PageMap,
- sizeof (PAGE_MAP_AND_DIRECTORY_POINTER)
- );
- }
-
- return (UINTN)PageMap; // FIXME
-}
-
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