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/** @file
Page table manipulation functions for IA-32 processors
Copyright (c) 2009 - 2023, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "PiSmmCpuDxeSmm.h"
/**
Create PageTable for SMM use.
@return PageTable Address
**/
UINT32
SmmInitPageTable (
VOID
)
{
UINTN PageFaultHandlerHookAddress;
IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
EFI_STATUS Status;
//
// Initialize spin lock
//
InitializeSpinLock (mPFLock);
mPhysicalAddressBits = 32;
mPagingMode = PagingPae;
if (FeaturePcdGet (PcdCpuSmmProfileEnable) ||
HEAP_GUARD_NONSTOP_MODE ||
NULL_DETECTION_NONSTOP_MODE)
{
//
// Set own Page Fault entry instead of the default one, because SMM Profile
// feature depends on IRET instruction to do Single Step
//
PageFaultHandlerHookAddress = (UINTN)PageFaultIdtHandlerSmmProfile;
IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *)gcSmiIdtr.Base;
IdtEntry += EXCEPT_IA32_PAGE_FAULT;
IdtEntry->Bits.OffsetLow = (UINT16)PageFaultHandlerHookAddress;
IdtEntry->Bits.Reserved_0 = 0;
IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
IdtEntry->Bits.OffsetHigh = (UINT16)(PageFaultHandlerHookAddress >> 16);
} else {
//
// Register SMM Page Fault Handler
//
Status = SmmRegisterExceptionHandler (&mSmmCpuService, EXCEPT_IA32_PAGE_FAULT, SmiPFHandler);
ASSERT_EFI_ERROR (Status);
}
//
// Additional SMM IDT initialization for SMM stack guard
//
if (FeaturePcdGet (PcdCpuSmmStackGuard)) {
InitializeIDTSmmStackGuard ();
}
return GenSmmPageTable (PagingPae, mPhysicalAddressBits);
}
/**
Page Fault handler for SMM use.
**/
VOID
SmiDefaultPFHandler (
VOID
)
{
CpuDeadLoop ();
}
/**
ThePage Fault handler wrapper for SMM use.
@param InterruptType Defines the type of interrupt or exception that
occurred on the processor.This parameter is processor architecture specific.
@param SystemContext A pointer to the processor context when
the interrupt occurred on the processor.
**/
VOID
EFIAPI
SmiPFHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
UINTN PFAddress;
UINTN GuardPageAddress;
UINTN CpuIndex;
ASSERT (InterruptType == EXCEPT_IA32_PAGE_FAULT);
AcquireSpinLock (mPFLock);
PFAddress = AsmReadCr2 ();
//
// If a page fault occurs in SMRAM range, it might be in a SMM stack guard page,
// or SMM page protection violation.
//
if ((PFAddress >= mCpuHotPlugData.SmrrBase) &&
(PFAddress < (mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize)))
{
DumpCpuContext (InterruptType, SystemContext);
CpuIndex = GetCpuIndex ();
GuardPageAddress = (mSmmStackArrayBase + EFI_PAGE_SIZE + CpuIndex * mSmmStackSize);
if ((FeaturePcdGet (PcdCpuSmmStackGuard)) &&
(PFAddress >= GuardPageAddress) &&
(PFAddress < (GuardPageAddress + EFI_PAGE_SIZE)))
{
DEBUG ((DEBUG_ERROR, "SMM stack overflow!\n"));
} else {
if ((SystemContext.SystemContextIa32->ExceptionData & IA32_PF_EC_ID) != 0) {
DEBUG ((DEBUG_ERROR, "SMM exception at execution (0x%x)\n", PFAddress));
DEBUG_CODE (
DumpModuleInfoByIp (*(UINTN *)(UINTN)SystemContext.SystemContextIa32->Esp);
);
} else {
DEBUG ((DEBUG_ERROR, "SMM exception at access (0x%x)\n", PFAddress));
DEBUG_CODE (
DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);
);
}
if (HEAP_GUARD_NONSTOP_MODE) {
GuardPagePFHandler (SystemContext.SystemContextIa32->ExceptionData);
goto Exit;
}
}
CpuDeadLoop ();
goto Exit;
}
//
// If a page fault occurs in non-SMRAM range.
//
if ((PFAddress < mCpuHotPlugData.SmrrBase) ||
(PFAddress >= mCpuHotPlugData.SmrrBase + mCpuHotPlugData.SmrrSize))
{
if ((SystemContext.SystemContextIa32->ExceptionData & IA32_PF_EC_ID) != 0) {
DumpCpuContext (InterruptType, SystemContext);
DEBUG ((DEBUG_ERROR, "Code executed on IP(0x%x) out of SMM range after SMM is locked!\n", PFAddress));
DEBUG_CODE (
DumpModuleInfoByIp (*(UINTN *)(UINTN)SystemContext.SystemContextIa32->Esp);
);
CpuDeadLoop ();
goto Exit;
}
//
// If NULL pointer was just accessed
//
if (((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT1) != 0) &&
(PFAddress < EFI_PAGE_SIZE))
{
DumpCpuContext (InterruptType, SystemContext);
DEBUG ((DEBUG_ERROR, "!!! NULL pointer access !!!\n"));
DEBUG_CODE (
DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);
);
if (NULL_DETECTION_NONSTOP_MODE) {
GuardPagePFHandler (SystemContext.SystemContextIa32->ExceptionData);
goto Exit;
}
CpuDeadLoop ();
goto Exit;
}
if (IsSmmCommBufferForbiddenAddress (PFAddress)) {
DumpCpuContext (InterruptType, SystemContext);
DEBUG ((DEBUG_ERROR, "Access SMM communication forbidden address (0x%x)!\n", PFAddress));
DEBUG_CODE (
DumpModuleInfoByIp ((UINTN)SystemContext.SystemContextIa32->Eip);
);
CpuDeadLoop ();
goto Exit;
}
}
if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
SmmProfilePFHandler (
SystemContext.SystemContextIa32->Eip,
SystemContext.SystemContextIa32->ExceptionData
);
} else {
DumpCpuContext (InterruptType, SystemContext);
SmiDefaultPFHandler ();
}
Exit:
ReleaseSpinLock (mPFLock);
}
/**
This function returns with no action for 32 bit.
@param[out] *Cr2 Pointer to variable to hold CR2 register value.
**/
VOID
SaveCr2 (
OUT UINTN *Cr2
)
{
return;
}
/**
This function returns with no action for 32 bit.
@param[in] Cr2 Value to write into CR2 register.
**/
VOID
RestoreCr2 (
IN UINTN Cr2
)
{
return;
}
/**
Return whether access to non-SMRAM is restricted.
@retval TRUE Access to non-SMRAM is restricted.
@retval FALSE Access to non-SMRAM is not restricted.
**/
BOOLEAN
IsRestrictedMemoryAccess (
VOID
)
{
return TRUE;
}
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