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64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/ke/i386/patpge.c
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* PURPOSE: Support for PAT and PGE (Large Pages)
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS *******************************************************************/
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ULONG Ke386GlobalPagesEnabled;
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/* FUNCTIONS *****************************************************************/
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ULONG_PTR
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NTAPI
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Ki386EnableGlobalPage(IN volatile ULONG_PTR Context)
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{
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volatile PLONG Count = (PLONG)Context;
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ULONG Cr4, Cr3;
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/* Disable interrupts */
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_disable();
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/* Decrease CPU Count and loop until it's reached 0 */
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do {InterlockedDecrement(Count);} while (!*Count);
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/* Now check if this is the Boot CPU */
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if (!KeGetPcr()->Number)
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{
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/* It is.FIXME: Patch KeFlushCurrentTb */
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}
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/* Now get CR4 and make sure PGE is masked out */
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Cr4 = __readcr4();
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__writecr4(Cr4 & ~CR4_PGE);
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/* Flush the TLB */
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Cr3 = __readcr3();
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__writecr3(Cr3);
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/* Now enable PGE */
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__writecr4(Cr4 | CR4_PGE);
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Ke386GlobalPagesEnabled = TRUE;
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/* Restore interrupts */
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_enable();
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return 0;
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}
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VOID
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NTAPI
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KiInitializePAT(VOID)
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{
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/* FIXME: Support this */
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DPRINT1("Advanced Memory features detected but not yet taken advantage of.\n");
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}
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