forked from xt-sys/exectos
107 lines
2.5 KiB
C
107 lines
2.5 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/i686/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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* Detects if eXtended Physical Addressing (XPA) is enabled and initializes page map support.
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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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MmInitializePageMapSupport(VOID)
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{
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/* Check if XPA is enabled */
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if(MmpGetExtendedPhysicalAddressingStatus())
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{
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/* Set PML3 page map information */
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MmpPageMapInfo.Xpa = TRUE;
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/* Set PML3 base addresses */
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MmpPageMapInfo.PteBase = MM_PTE_BASE;
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MmpPageMapInfo.PdeBase = MM_PDE_BASE;
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/* Set PML3 shift values */
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MmpPageMapInfo.PdiShift = MM_PDI_SHIFT;
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MmpPageMapInfo.PteShift = MM_PTE_SHIFT;
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}
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else
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{
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/* Set PML2 page map information */
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MmpPageMapInfo.Xpa = FALSE;
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/* Set PML2 base addresses */
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MmpPageMapInfo.PteBase = MM_PTE_BASE;
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MmpPageMapInfo.PdeBase = MM_PDE_LEGACY_BASE;
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/* Set PML2 shift values */
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MmpPageMapInfo.PdiShift = MM_PDI_LEGACY_SHIFT;
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MmpPageMapInfo.PteShift = MM_PTE_LEGACY_SHIFT;
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}
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}
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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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ULONG Offset;
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/* Calculate offset and return PTE address */
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Offset = ((((ULONG)(Address)) >> 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 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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ULONG Offset;
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/* Calculate offset and return PTE address */
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Offset = ((((ULONG)(Address)) >> 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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* 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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