191 lines
4.3 KiB
C
191 lines
4.3 KiB
C
/**
|
|
* PROJECT: ExectOS
|
|
* COPYRIGHT: See COPYING.md in the top level directory
|
|
* FILE: xtoskrnl/mm/amd64/pmap.c
|
|
* DESCRIPTION: Low-level support for AMD64 page map manipulation
|
|
* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
|
|
*/
|
|
|
|
#include <xtos.h>
|
|
|
|
|
|
/**
|
|
* Clears the contents of a page table entry (PTE).
|
|
*
|
|
* @param PtePointer
|
|
* Pointer to the page table entry (PTE) to be cleared.
|
|
*
|
|
* @return This routine does not return any value.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
VOID
|
|
MmpClearPte(PHARDWARE_PTE PtePointer)
|
|
{
|
|
PtePointer->CacheDisable = 0;
|
|
PtePointer->PageFrameNumber = 0;
|
|
PtePointer->Valid = 0;
|
|
PtePointer->Writable = 0;
|
|
PtePointer->WriteThrough = 0;
|
|
}
|
|
|
|
/**
|
|
* Checks if eXtended Physical Addressing (XPA) is enabled.
|
|
*
|
|
* @return This routine returns TRUE if LA57 is enabled, or FALSE otherwise.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
BOOLEAN
|
|
MmpGetExtendedPhysicalAddressingStatus(VOID)
|
|
{
|
|
/* Check if LA57 is enabled */
|
|
return ((ArReadControlRegister(4) & CR4_LA57) != 0) ? TRUE : FALSE;
|
|
}
|
|
|
|
/**
|
|
* Gets the address of the P5E (Page Map Level 5 Entry), that maps given address.
|
|
*
|
|
* @param Address
|
|
* Specifies the virtual address for which to retrieve the corresponding P5E.
|
|
*
|
|
* @return This routine returns the address of the P5E, or NULL if LA57 is not enabled.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
PMMP5E
|
|
MmpGetP5eAddress(PVOID Address)
|
|
{
|
|
ULONGLONG Offset;
|
|
|
|
Offset = (((ULONGLONG)Address >> MM_P5I_SHIFT) << MM_PTE_SHIFT);
|
|
return (PMMP5E)((MmpPageMapInfo.P5eBase + Offset) * MmpPageMapInfo.Xpa);
|
|
}
|
|
|
|
/**
|
|
* Gets the address of the PDE (Page Directory Entry), that maps given address.
|
|
*
|
|
* @param Address
|
|
* Specifies the virtual address for which to retrieve the corresponding PDE.
|
|
*
|
|
* @return This routine returns the address of the PDE.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
PMMPDE
|
|
MmpGetPdeAddress(PVOID Address)
|
|
{
|
|
ULONGLONG Offset;
|
|
|
|
Offset = (((ULONGLONG)Address >> MM_PDI_SHIFT) << MM_PTE_SHIFT);
|
|
return (PMMPDE)(MmpPageMapInfo.PdeBase + Offset);
|
|
}
|
|
|
|
/**
|
|
* Gets the address of the PPE (Page Directory Pointer Table Entry), that maps given address.
|
|
*
|
|
* @param Address
|
|
* Specifies the virtual address for which to retrieve the corresponding PPE.
|
|
*
|
|
* @return This routine returns the address of the PPE.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
PMMPPE
|
|
MmpGetPpeAddress(PVOID Address)
|
|
{
|
|
ULONGLONG Offset;
|
|
|
|
Offset = (((ULONGLONG)Address >> MM_PPI_SHIFT) << MM_PTE_SHIFT);
|
|
return (PMMPPE)(MmpPageMapInfo.PpeBase + Offset);
|
|
}
|
|
|
|
/**
|
|
* Gets the address of the PTE (Page Table Entry), that maps given address.
|
|
*
|
|
* @param Address
|
|
* Specifies the virtual address for which to retrieve the corresponding PTE.
|
|
*
|
|
* @return This routine returns the address of the PTE.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
PMMPTE
|
|
MmpGetPteAddress(PVOID Address)
|
|
{
|
|
ULONGLONG Offset;
|
|
|
|
Offset = (((ULONGLONG)Address >> MM_PTI_SHIFT) << MM_PTE_SHIFT);
|
|
return (PMMPTE)(MmpPageMapInfo.PteBase + Offset);
|
|
}
|
|
|
|
/**
|
|
* Gets the address of the PXE (Extended Page Entry), that maps given address.
|
|
*
|
|
* @param Address
|
|
* Specifies the virtual address for which to retrieve the corresponding PXE.
|
|
*
|
|
* @return This routine returns the address of the PXE.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
PMMPXE
|
|
MmpGetPxeAddress(PVOID Address)
|
|
{
|
|
ULONGLONG Offset;
|
|
|
|
Offset = (((ULONGLONG)Address >> MM_PXI_SHIFT) << MM_PTE_SHIFT);
|
|
return (PMMPXE)(MmpPageMapInfo.PxeBase + Offset);
|
|
}
|
|
|
|
/**
|
|
* Checks whether the given page table entry (PTE) is valid.
|
|
*
|
|
* @param PtePointer
|
|
* Pointer to the page table entry (PTE) to check.
|
|
*
|
|
* @return Returns TRUE if the entry is valid, FALSE otherwise.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
BOOLEAN
|
|
MmpPteValid(PHARDWARE_PTE PtePointer)
|
|
{
|
|
return (BOOLEAN)PtePointer->Valid;
|
|
}
|
|
|
|
/**
|
|
* Sets a page table entry (PTE) with the specified physical page and access flags.
|
|
*
|
|
* @param PtePointer
|
|
* Pointer to the page table entry (PTE) to set.
|
|
*
|
|
* @param PageFrameNumber
|
|
* Physical frame number to map.
|
|
*
|
|
* @param Writable
|
|
* Indicates whether the page should be writable.
|
|
*
|
|
* @return This routine does not return any value.
|
|
*
|
|
* @since XT 1.0
|
|
*/
|
|
XTAPI
|
|
VOID
|
|
MmpSetPte(PHARDWARE_PTE PtePointer,
|
|
PFN_NUMBER PageFrameNumber,
|
|
BOOLEAN Writable)
|
|
{
|
|
PtePointer->PageFrameNumber = PageFrameNumber;
|
|
PtePointer->Valid = 1;
|
|
PtePointer->Writable = Writable;
|
|
}
|