94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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pat.c
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Abstract:
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This module initializes the page attributes table.
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Author:
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David N. Cutler (davec) 2-May-2001
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "ki.h"
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#pragma alloc_text(PAGELK, KiSetPageAttributesTable)
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VOID
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KiSetPageAttributesTable (
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VOID
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)
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/*++
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Routine Description:
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This function initializes the page attribute table for the current
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processor. The page attribute table is set up to provide write back,
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write combining, uncacheable/stronly order, and uncacheable/weakly
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ordered.
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PAT_Entry PAT Index PCD PWT Memory Type
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0 0 0 0 WB
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1 0 0 1 WC *
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2 0 1 0 WEAK_UC
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3 0 1 1 STRONG_UC
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4 1 0 0 WB
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5 1 0 1 WC *
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6 1 1 0 WEAK_UC
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7 1 1 1 STRONG_UC
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N.B. The caller must have the PAGELK code locked before calling this
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function.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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PAT_ATTRIBUTES Attributes;
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//
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// Initialize the page attribute table.
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//
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Attributes.hw.Pat[0] = PAT_TYPE_WB;
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Attributes.hw.Pat[1] = PAT_TYPE_USWC;
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Attributes.hw.Pat[2] = PAT_TYPE_WEAK_UC;
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Attributes.hw.Pat[3] = PAT_TYPE_STRONG_UC;
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Attributes.hw.Pat[4] = PAT_TYPE_WB;
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Attributes.hw.Pat[5] = PAT_TYPE_USWC;
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Attributes.hw.Pat[6] = PAT_TYPE_WEAK_UC;
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Attributes.hw.Pat[7] = PAT_TYPE_STRONG_UC;
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//
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// Invalidate the cache on the current proccesor, write the page attributes
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// table, and invalidate the cache a second time.
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//
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WritebackInvalidate();
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WriteMSR(MSR_PAT, Attributes.QuadPart);
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WritebackInvalidate();
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return;
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}
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