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Correctly manage PAE state when enabling paging
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Aiken Harris 2025-08-02 18:26:01 +02:00 committed by CodingWorkshop Signing Team
parent e6ebac7cda
commit ca06f9ebb5
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
1 changed files with 15 additions and 2 deletions
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17
xtldr/modules/xtos_o/i686/memory.c
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@ -125,8 +125,21 @@ XtEnablePaging(IN PXTBL_PAGE_MAPPING PageMap)
return STATUS_EFI_ABORTED;
}
/* Enable Physical Address Extension (PAE) */
ArWriteControlRegister(4, ArReadControlRegister(4) | CR4_PAE);
/* Disable paging */
ArWriteControlRegister(0, ArReadControlRegister(0) & ~CR0_PG);
if(PageMap->PageMapLevel == 3)
{
/* Enable Physical Address Extension (PAE) */
XtLdrProtocol->Debug.Print(L"Enabling Physical Address Extension (PAE)\n");
ArWriteControlRegister(4, ArReadControlRegister(4) | CR4_PAE);
}
else
{
/* Disable Physical Address Extension (PAE) */
XtLdrProtocol->Debug.Print(L"Disabling Physical Address Extension (PAE)\n");
ArWriteControlRegister(4, ArReadControlRegister(4) & ~CR4_PAE);
}
/* Write page mappings to CR3 */
ArWriteControlRegister(3, (UINT_PTR)PageMap->PtePointer);