120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/mm/amd64/init.c
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* DESCRIPTION: Architecture specific Memory Manager initialization routines
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Gets the address of the PDE (Page Directory Entry), that maps given address.
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*
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* @param Address
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* Specifies the address to find the PDE for.
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*
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* @return This routine returns the address of the PDE.
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*
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* @since XT 1.0
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*/
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XTAPI
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PMMPTE
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MmpGetPdeAddress(PVOID Address)
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{
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ULONGLONG Offset;
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Offset = ((((ULONGLONG)Address & (((ULONGLONG)1 << 48) - 1)) >> MM_PDI_SHIFT) << MM_PTE_SHIFT);
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return (PMMPTE)(MM_PDE_BASE + Offset);
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}
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/**
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* Gets the address of the PPE (Page Directory Pointer Table Entry), that maps given address.
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*
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* @param Address
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* Specifies the address to find the PPE for.
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*
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* @return This routine returns the address of the PPE.
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*
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* @since XT 1.0
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*/
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XTAPI
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PMMPTE
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MmpGetPpeAddress(PVOID Address)
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{
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ULONGLONG Offset;
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Offset = ((((ULONGLONG)Address & (((ULONGLONG)1 << 48) - 1)) >> MM_PPI_SHIFT) << MM_PTE_SHIFT);
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return (PMMPTE)(MM_PPE_BASE + Offset);
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}
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/**
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* Gets the address of the PTE (Page Table Entry), that maps given address.
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*
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* @param Address
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* Specifies the address to find the PTE for.
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*
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* @return This routine returns the address of the PTE.
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*
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* @since XT 1.0
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*/
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XTAPI
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PMMPTE
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MmpGetPteAddress(PVOID Address)
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{
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ULONGLONG Offset;
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Offset = ((((ULONGLONG)Address & (((ULONGLONG)1 << 48) - 1)) >> MM_PTI_SHIFT) << MM_PTE_SHIFT);
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return (PMMPTE)(MM_PTE_BASE + Offset);
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}
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/**
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* Gets the address of the PXE (Extended Page Entry), that maps given address.
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*
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* @param Address
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* Specifies the address to find the PXE for.
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*
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* @return This routine returns the address of the PXE.
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*
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* @since XT 1.0
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*/
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XTAPI
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PMMPTE
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MmpGetPxeAddress(PVOID Address)
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{
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ULONGLONG Offset;
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Offset = (((ULONGLONG)Address >> MM_PXI_SHIFT) & (MM_PXE_PER_PAGE - 1));
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return (PMMPTE)(MM_PXE_BASE + Offset);
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}
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/**
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* Performs architecture specific initialization of the XTOS Memory Manager.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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MmpInitializeArchitecture(VOID)
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{
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UNIMPLEMENTED;
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}
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/**
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* Checks if LA57 (PML5) is enabled.
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*
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* @return This routine returns TRUE if LA57 is enabled, or FALSE otherwise.
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*
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* @since XT 1.0
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*/
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XTAPI
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BOOLEAN
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MmpMemoryExtensionEnabled(VOID)
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{
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/* Check if LA57 (PML5) is enabled */
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return ((ArReadControlRegister(4) & CR4_LA57) != 0) ? TRUE : FALSE;
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}
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