26 lines
629 B
C
26 lines
629 B
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/pmap.c
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* DESCRIPTION: Low-level support for AMD64 page map manipulation
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.h>
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/**
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* Checks if eXtended Physical Addressing (XPA) 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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MmpGetExtendedPhysicalAddressingStatus(VOID)
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{
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/* Check if LA57 is enabled */
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return ((ArReadControlRegister(4) & CR4_LA57) != 0) ? TRUE : FALSE;
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}
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