c8c6cf149d
Add OUTPUT IsModified parameter in PageTableMap() to indicate if page table has been modified. With this parameter, caller can know if need to call FlushTlb when the page table is in CR3. Signed-off-by: Dun Tan <dun.tan@intel.com> Cc: Eric Dong <eric.dong@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> Tested-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/** @file
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Function to create page talbe.
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Only create page table for x64, and leave the CreatePageTable empty for Ia32.
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Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/CpuPageTableLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Base.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseLib.h>
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/**
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Create 1:1 mapping page table in reserved memory to map the specified address range.
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@param[in] LinearAddress The start of the linear address range.
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@param[in] Length The length of the linear address range.
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@return The page table to be created.
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**/
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UINTN
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CreatePageTable (
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IN UINTN Address,
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IN UINTN Length
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)
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{
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EFI_STATUS Status;
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VOID *PageTableBuffer;
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UINTN PageTableBufferSize;
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UINTN PageTable;
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PAGING_MODE PagingMode;
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IA32_CR4 Cr4;
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IA32_MAP_ATTRIBUTE MapAttribute;
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IA32_MAP_ATTRIBUTE MapMask;
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MapAttribute.Uint64 = Address;
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MapAttribute.Bits.Present = 1;
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MapAttribute.Bits.ReadWrite = 1;
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MapMask.Uint64 = MAX_UINT64;
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PageTable = 0;
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PageTableBufferSize = 0;
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Cr4.UintN = AsmReadCr4 ();
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if (Cr4.Bits.LA57 == 1) {
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PagingMode = Paging5Level;
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} else {
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PagingMode = Paging4Level;
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}
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Status = PageTableMap (
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&PageTable,
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PagingMode,
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NULL,
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&PageTableBufferSize,
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Address,
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Length,
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&MapAttribute,
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&MapMask,
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NULL
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);
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ASSERT (Status == EFI_BUFFER_TOO_SMALL);
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DEBUG ((DEBUG_INFO, "AP Page Table Buffer Size = %x\n", PageTableBufferSize));
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PageTableBuffer = AllocateReservedPages (EFI_SIZE_TO_PAGES (PageTableBufferSize));
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ASSERT (PageTableBuffer != NULL);
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Status = PageTableMap (
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&PageTable,
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PagingMode,
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PageTableBuffer,
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&PageTableBufferSize,
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Address,
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Length,
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&MapAttribute,
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&MapMask,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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return PageTable;
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}
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