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audk/UefiCpuPkg/Library/MtrrLib/MtrrLib.c

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/** @file
MTRR setting library
Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Base.h>
#include <Library/MtrrLib.h>
#include <Library/BaseLib.h>
#include <Library/CpuLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
//
// Context to save and restore when MTRRs are programmed
//
typedef struct {
UINTN Cr4;
BOOLEAN InterruptState;
} MTRR_CONTEXT;
//
// This table defines the offset, base and length of the fixed MTRRs
//
CONST FIXED_MTRR mMtrrLibFixedMtrrTable[] = {
{
MTRR_LIB_IA32_MTRR_FIX64K_00000,
0,
SIZE_64KB
},
{
MTRR_LIB_IA32_MTRR_FIX16K_80000,
0x80000,
SIZE_16KB
},
{
MTRR_LIB_IA32_MTRR_FIX16K_A0000,
0xA0000,
SIZE_16KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_C0000,
0xC0000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_C8000,
0xC8000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_D0000,
0xD0000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_D8000,
0xD8000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_E0000,
0xE0000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_E8000,
0xE8000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_F0000,
0xF0000,
SIZE_4KB
},
{
MTRR_LIB_IA32_MTRR_FIX4K_F8000,
0xF8000,
SIZE_4KB
},
};
//
// Lookup table used to print MTRRs
//
GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 *mMtrrMemoryCacheTypeShortName[] = {
"UC", // CacheUncacheable
"WC", // CacheWriteCombining
"R*", // Invalid
"R*", // Invalid
"WT", // CacheWriteThrough
"WP", // CacheWriteProtected
"WB", // CacheWriteBack
"R*" // Invalid
};
/**
Returns the variable MTRR count for the CPU.
@return Variable MTRR count
**/
UINT32
EFIAPI
GetVariableMtrrCount (
VOID
)
{
UINT32 VariableMtrrCount;
if (!IsMtrrSupported ()) {
return 0;
}
VariableMtrrCount = (UINT32)(AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP) & MTRR_LIB_IA32_MTRR_CAP_VCNT_MASK);
ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
return VariableMtrrCount;
}
/**
Returns the firmware usable variable MTRR count for the CPU.
@return Firmware usable variable MTRR count
**/
UINT32
EFIAPI
GetFirmwareVariableMtrrCount (
VOID
)
{
UINT32 VariableMtrrCount;
VariableMtrrCount = GetVariableMtrrCount ();
if (VariableMtrrCount < RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER) {
return 0;
}
return VariableMtrrCount - RESERVED_FIRMWARE_VARIABLE_MTRR_NUMBER;
}
/**
Returns the default MTRR cache type for the system.
@return The default MTRR cache type.
**/
MTRR_MEMORY_CACHE_TYPE
EFIAPI
MtrrGetDefaultMemoryType (
VOID
)
{
if (!IsMtrrSupported ()) {
return CacheUncacheable;
}
return (MTRR_MEMORY_CACHE_TYPE) (AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE) & 0x7);
}
/**
Preparation before programming MTRR.
This function will do some preparation for programming MTRRs:
disable cache, invalid cache and disable MTRR caching functionality
@param[out] MtrrContext Pointer to context to save
**/
VOID
PreMtrrChange (
OUT MTRR_CONTEXT *MtrrContext
)
{
//
// Disable interrupts and save current interrupt state
//
MtrrContext->InterruptState = SaveAndDisableInterrupts();
//
// Enter no fill cache mode, CD=1(Bit30), NW=0 (Bit29)
//
AsmDisableCache ();
//
// Save original CR4 value and clear PGE flag (Bit 7)
//
MtrrContext->Cr4 = AsmReadCr4 ();
AsmWriteCr4 (MtrrContext->Cr4 & (~BIT7));
//
// Flush all TLBs
//
CpuFlushTlb ();
//
// Disable Mtrrs
//
AsmMsrBitFieldWrite64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, 10, 11, 0);
}
/**
Cleaning up after programming MTRRs.
This function will do some clean up after programming MTRRs:
Flush all TLBs, re-enable caching, restore CR4.
@param[in] MtrrContext Pointer to context to restore
**/
VOID
PostMtrrChangeEnableCache (
IN MTRR_CONTEXT *MtrrContext
)
{
//
// Flush all TLBs
//
CpuFlushTlb ();
//
// Enable Normal Mode caching CD=NW=0, CD(Bit30), NW(Bit29)
//
AsmEnableCache ();
//
// Restore original CR4 value
//
AsmWriteCr4 (MtrrContext->Cr4);
//
// Restore original interrupt state
//
SetInterruptState (MtrrContext->InterruptState);
}
/**
Cleaning up after programming MTRRs.
This function will do some clean up after programming MTRRs:
enable MTRR caching functionality, and enable cache
@param[in] MtrrContext Pointer to context to restore
**/
VOID
PostMtrrChange (
IN MTRR_CONTEXT *MtrrContext
)
{
//
// Enable Cache MTRR
//
AsmMsrBitFieldWrite64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, 10, 11, 3);
PostMtrrChangeEnableCache (MtrrContext);
}
/**
Programs fixed MTRRs registers.
@param MemoryCacheType The memory type to set.
@param Base The base address of memory range.
@param Length The length of memory range.
@retval RETURN_SUCCESS The cache type was updated successfully
@retval RETURN_UNSUPPORTED The requested range or cache type was invalid
for the fixed MTRRs.
**/
RETURN_STATUS
ProgramFixedMtrr (
IN UINT64 MemoryCacheType,
IN OUT UINT64 *Base,
IN OUT UINT64 *Length
)
{
UINT32 MsrNum;
UINT32 ByteShift;
UINT64 TempQword;
UINT64 OrMask;
UINT64 ClearMask;
TempQword = 0;
OrMask = 0;
ClearMask = 0;
for (MsrNum = 0; MsrNum < MTRR_NUMBER_OF_FIXED_MTRR; MsrNum++) {
if ((*Base >= mMtrrLibFixedMtrrTable[MsrNum].BaseAddress) &&
(*Base <
(
mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +
(8 * mMtrrLibFixedMtrrTable[MsrNum].Length)
)
)
) {
break;
}
}
if (MsrNum == MTRR_NUMBER_OF_FIXED_MTRR) {
return RETURN_UNSUPPORTED;
}
//
// We found the fixed MTRR to be programmed
//
for (ByteShift = 0; ByteShift < 8; ByteShift++) {
if (*Base ==
(
mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +
(ByteShift * mMtrrLibFixedMtrrTable[MsrNum].Length)
)
) {
break;
}
}
if (ByteShift == 8) {
return RETURN_UNSUPPORTED;
}
for (
;
((ByteShift < 8) && (*Length >= mMtrrLibFixedMtrrTable[MsrNum].Length));
ByteShift++
) {
OrMask |= LShiftU64 ((UINT64) MemoryCacheType, (UINT32) (ByteShift * 8));
ClearMask |= LShiftU64 ((UINT64) 0xFF, (UINT32) (ByteShift * 8));
*Length -= mMtrrLibFixedMtrrTable[MsrNum].Length;
*Base += mMtrrLibFixedMtrrTable[MsrNum].Length;
}
if (ByteShift < 8 && (*Length != 0)) {
return RETURN_UNSUPPORTED;
}
TempQword =
(AsmReadMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr) & ~ClearMask) | OrMask;
AsmWriteMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr, TempQword);
return RETURN_SUCCESS;
}
/**
Get the attribute of variable MTRRs.
This function shadows the content of variable MTRRs into an
internal array: VariableMtrr.
@param MtrrValidBitsMask The mask for the valid bit of the MTRR
@param MtrrValidAddressMask The valid address mask for MTRR
@param VariableMtrr The array to shadow variable MTRRs content
@return The return value of this paramter indicates the
number of MTRRs which has been used.
**/
UINT32
EFIAPI
MtrrGetMemoryAttributeInVariableMtrr (
IN UINT64 MtrrValidBitsMask,
IN UINT64 MtrrValidAddressMask,
OUT VARIABLE_MTRR *VariableMtrr
)
{
UINTN Index;
UINT32 MsrNum;
UINT32 UsedMtrr;
UINT32 FirmwareVariableMtrrCount;
UINT32 VariableMtrrEnd;
if (!IsMtrrSupported ()) {
return 0;
}
FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();
VariableMtrrEnd = MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (2 * GetVariableMtrrCount ()) - 1;
ZeroMem (VariableMtrr, sizeof (VARIABLE_MTRR) * MTRR_NUMBER_OF_VARIABLE_MTRR);
UsedMtrr = 0;
for (MsrNum = MTRR_LIB_IA32_VARIABLE_MTRR_BASE, Index = 0;
(
(MsrNum < VariableMtrrEnd) &&
(Index < FirmwareVariableMtrrCount)
);
MsrNum += 2
) {
if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) != 0) {
VariableMtrr[Index].Msr = MsrNum;
VariableMtrr[Index].BaseAddress = (AsmReadMsr64 (MsrNum) &
MtrrValidAddressMask);
VariableMtrr[Index].Length = ((~(AsmReadMsr64 (MsrNum + 1) &
MtrrValidAddressMask)
) &
MtrrValidBitsMask
) + 1;
VariableMtrr[Index].Type = (AsmReadMsr64 (MsrNum) & 0x0ff);
VariableMtrr[Index].Valid = TRUE;
VariableMtrr[Index].Used = TRUE;
UsedMtrr = UsedMtrr + 1;
Index++;
}
}
return UsedMtrr;
}
/**
Checks overlap between given memory range and MTRRs.
@param Start The start address of memory range.
@param End The end address of memory range.
@param VariableMtrr The array to shadow variable MTRRs content
@retval TRUE Overlap exists.
@retval FALSE No overlap.
**/
BOOLEAN
CheckMemoryAttributeOverlap (
IN PHYSICAL_ADDRESS Start,
IN PHYSICAL_ADDRESS End,
IN VARIABLE_MTRR *VariableMtrr
)
{
UINT32 Index;
for (Index = 0; Index < 6; Index++) {
if (
VariableMtrr[Index].Valid &&
!(
(Start > (VariableMtrr[Index].BaseAddress +
VariableMtrr[Index].Length - 1)
) ||
(End < VariableMtrr[Index].BaseAddress)
)
) {
return TRUE;
}
}
return FALSE;
}
/**
Marks a variable MTRR as non-valid.
@param Index The index of the array VariableMtrr to be invalidated
@param VariableMtrr The array to shadow variable MTRRs content
@param UsedMtrr The number of MTRRs which has already been used
**/
VOID
InvalidateShadowMtrr (
IN UINTN Index,
IN VARIABLE_MTRR *VariableMtrr,
OUT UINT32 *UsedMtrr
)
{
VariableMtrr[Index].Valid = FALSE;
*UsedMtrr = *UsedMtrr - 1;
}
/**
Combine memory attributes.
If overlap exists between given memory range and MTRRs, try to combine them.
@param Attributes The memory type to set.
@param Base The base address of memory range.
@param Length The length of memory range.
@param VariableMtrr The array to shadow variable MTRRs content
@param UsedMtrr The number of MTRRs which has already been used
@param OverwriteExistingMtrr Returns whether an existing MTRR was used
@retval EFI_SUCCESS Memory region successfully combined.
@retval EFI_ACCESS_DENIED Memory region cannot be combined.
**/
RETURN_STATUS
CombineMemoryAttribute (
IN UINT64 Attributes,
IN OUT UINT64 *Base,
IN OUT UINT64 *Length,
IN VARIABLE_MTRR *VariableMtrr,
IN OUT UINT32 *UsedMtrr,
OUT BOOLEAN *OverwriteExistingMtrr
)
{
UINT32 Index;
UINT64 CombineStart;
UINT64 CombineEnd;
UINT64 MtrrEnd;
UINT64 EndAddress;
UINT32 FirmwareVariableMtrrCount;
BOOLEAN CoveredByExistingMtrr;
FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();
*OverwriteExistingMtrr = FALSE;
CoveredByExistingMtrr = FALSE;
EndAddress = *Base +*Length - 1;
for (Index = 0; Index < FirmwareVariableMtrrCount; Index++) {
MtrrEnd = VariableMtrr[Index].BaseAddress + VariableMtrr[Index].Length - 1;
if (
!VariableMtrr[Index].Valid ||
(
*Base > (MtrrEnd) ||
(EndAddress < VariableMtrr[Index].BaseAddress)
)
) {
continue;
}
//
// Combine same attribute MTRR range
//
if (Attributes == VariableMtrr[Index].Type) {
//
// if the Mtrr range contain the request range, set a flag, then continue to
// invalidate any MTRR of the same request range with higher priority cache type.
//
if (VariableMtrr[Index].BaseAddress <= *Base && MtrrEnd >= EndAddress) {
CoveredByExistingMtrr = TRUE;
continue;
}
//
// invalid this MTRR, and program the combine range
//
CombineStart =
(*Base) < VariableMtrr[Index].BaseAddress ?
(*Base) :
VariableMtrr[Index].BaseAddress;
CombineEnd = EndAddress > MtrrEnd ? EndAddress : MtrrEnd;
//
// Record the MTRR usage status in VariableMtrr array.
//
InvalidateShadowMtrr (Index, VariableMtrr, UsedMtrr);
*Base = CombineStart;
*Length = CombineEnd - CombineStart + 1;
EndAddress = CombineEnd;
*OverwriteExistingMtrr = TRUE;
continue;
} else {
//
// The cache type is different, but the range is convered by one MTRR
//
if (VariableMtrr[Index].BaseAddress == *Base && MtrrEnd == EndAddress) {
InvalidateShadowMtrr (Index, VariableMtrr, UsedMtrr);
continue;
}
}
if ((Attributes== MTRR_CACHE_WRITE_THROUGH &&
VariableMtrr[Index].Type == MTRR_CACHE_WRITE_BACK) ||
(Attributes == MTRR_CACHE_WRITE_BACK &&
VariableMtrr[Index].Type == MTRR_CACHE_WRITE_THROUGH) ||
(Attributes == MTRR_CACHE_UNCACHEABLE) ||
(VariableMtrr[Index].Type == MTRR_CACHE_UNCACHEABLE)
) {
*OverwriteExistingMtrr = TRUE;
continue;
}
//
// Other type memory overlap is invalid
//
return RETURN_ACCESS_DENIED;
}
if (CoveredByExistingMtrr) {
*Length = 0;
}
return RETURN_SUCCESS;
}
/**
Calculate the maximum value which is a power of 2, but less the MemoryLength.
@param MemoryLength The number to pass in.
@return The maximum value which is align to power of 2 and less the MemoryLength
**/
UINT64
Power2MaxMemory (
IN UINT64 MemoryLength
)
{
UINT64 Result;
if (RShiftU64 (MemoryLength, 32) != 0) {
Result = LShiftU64 (
(UINT64) GetPowerOfTwo32 (
(UINT32) RShiftU64 (MemoryLength, 32)
),
32
);
} else {
Result = (UINT64) GetPowerOfTwo32 ((UINT32) MemoryLength);
}
return Result;
}
/**
Determine the MTRR numbers used to program a memory range.
This function first checks the alignment of the base address. If the alignment of the base address <= Length,
cover the memory range (BaseAddress, alignment) by a MTRR, then BaseAddress += alignment and Length -= alignment.
Repeat the step until alignment > Length.
Then this function determines which direction of programming the variable MTRRs for the remaining length
will use fewer MTRRs.
@param BaseAddress Length of Memory to program MTRR
@param Length Length of Memory to program MTRR
@param MtrrNumber Pointer to the number of necessary MTRRs
@retval TRUE Positive direction is better.
FALSE Negtive direction is better.
**/
BOOLEAN
GetMtrrNumberAndDirection (
IN UINT64 BaseAddress,
IN UINT64 Length,
IN UINTN *MtrrNumber
)
{
UINT64 TempQword;
UINT64 Alignment;
UINT32 Positive;
UINT32 Subtractive;
*MtrrNumber = 0;
if (BaseAddress != 0) {
do {
//
// Calculate the alignment of the base address.
//
Alignment = LShiftU64 (1, (UINTN)LowBitSet64 (BaseAddress));
if (Alignment > Length) {
break;
}
(*MtrrNumber)++;
BaseAddress += Alignment;
Length -= Alignment;
} while (TRUE);
if (Length == 0) {
return TRUE;
}
}
TempQword = Length;
Positive = 0;
Subtractive = 0;
do {
TempQword -= Power2MaxMemory (TempQword);
Positive++;
} while (TempQword != 0);
TempQword = Power2MaxMemory (LShiftU64 (Length, 1)) - Length;
Subtractive++;
do {
TempQword -= Power2MaxMemory (TempQword);
Subtractive++;
} while (TempQword != 0);
if (Positive <= Subtractive) {
*MtrrNumber += Positive;
return TRUE;
} else {
*MtrrNumber += Subtractive;
return FALSE;
}
}
/**
Invalid variable MTRRs according to the value in the shadow array.
This function programs MTRRs according to the values specified
in the shadow array.
@param VariableMtrr The array to shadow variable MTRRs content
**/
VOID
InvalidateMtrr (
IN VARIABLE_MTRR *VariableMtrr
)
{
UINTN Index;
UINTN VariableMtrrCount;
MTRR_CONTEXT MtrrContext;
PreMtrrChange (&MtrrContext);
Index = 0;
VariableMtrrCount = GetVariableMtrrCount ();
while (Index < VariableMtrrCount) {
if (!VariableMtrr[Index].Valid && VariableMtrr[Index].Used) {
AsmWriteMsr64 (VariableMtrr[Index].Msr, 0);
AsmWriteMsr64 (VariableMtrr[Index].Msr + 1, 0);
VariableMtrr[Index].Used = FALSE;
}
Index ++;
}
PostMtrrChange (&MtrrContext);
}
/**
Programs variable MTRRs
This function programs variable MTRRs
@param MtrrNumber Index of MTRR to program.
@param BaseAddress Base address of memory region.
@param Length Length of memory region.
@param MemoryCacheType Memory type to set.
@param MtrrValidAddressMask The valid address mask for MTRR
**/
VOID
ProgramVariableMtrr (
IN UINTN MtrrNumber,
IN PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length,
IN UINT64 MemoryCacheType,
IN UINT64 MtrrValidAddressMask
)
{
UINT64 TempQword;
MTRR_CONTEXT MtrrContext;
PreMtrrChange (&MtrrContext);
//
// MTRR Physical Base
//
TempQword = (BaseAddress & MtrrValidAddressMask) | MemoryCacheType;
AsmWriteMsr64 ((UINT32) MtrrNumber, TempQword);
//
// MTRR Physical Mask
//
TempQword = ~(Length - 1);
AsmWriteMsr64 (
(UINT32) (MtrrNumber + 1),
(TempQword & MtrrValidAddressMask) | MTRR_LIB_CACHE_MTRR_ENABLED
);
PostMtrrChange (&MtrrContext);
}
/**
Convert the Memory attibute value to MTRR_MEMORY_CACHE_TYPE.
@param MtrrType MTRR memory type
@return The enum item in MTRR_MEMORY_CACHE_TYPE
**/
MTRR_MEMORY_CACHE_TYPE
GetMemoryCacheTypeFromMtrrType (
IN UINT64 MtrrType
)
{
switch (MtrrType) {
case MTRR_CACHE_UNCACHEABLE:
return CacheUncacheable;
case MTRR_CACHE_WRITE_COMBINING:
return CacheWriteCombining;
case MTRR_CACHE_WRITE_THROUGH:
return CacheWriteThrough;
case MTRR_CACHE_WRITE_PROTECTED:
return CacheWriteProtected;
case MTRR_CACHE_WRITE_BACK:
return CacheWriteBack;
default:
//
// MtrrType is MTRR_CACHE_INVALID_TYPE, that means
// no mtrr covers the range
//
return MtrrGetDefaultMemoryType ();
}
}
/**
Initializes the valid bits mask and valid address mask for MTRRs.
This function initializes the valid bits mask and valid address mask for MTRRs.
@param MtrrValidBitsMask The mask for the valid bit of the MTRR
@param MtrrValidAddressMask The valid address mask for the MTRR
**/
VOID
MtrrLibInitializeMtrrMask (
OUT UINT64 *MtrrValidBitsMask,
OUT UINT64 *MtrrValidAddressMask
)
{
UINT32 RegEax;
UINT8 PhysicalAddressBits;
AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
if (RegEax >= 0x80000008) {
AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
PhysicalAddressBits = (UINT8) RegEax;
*MtrrValidBitsMask = LShiftU64 (1, PhysicalAddressBits) - 1;
*MtrrValidAddressMask = *MtrrValidBitsMask & 0xfffffffffffff000ULL;
} else {
*MtrrValidBitsMask = MTRR_LIB_MSR_VALID_MASK;
*MtrrValidAddressMask = MTRR_LIB_CACHE_VALID_ADDRESS;
}
}
/**
Determing the real attribute of a memory range.
This function is to arbitrate the real attribute of the memory when
there are 2 MTRR covers the same memory range. For further details,
please refer the IA32 Software Developer's Manual, Volume 3,
Section 10.11.4.1.
@param MtrrType1 the first kind of Memory type
@param MtrrType2 the second kind of memory type
**/
UINT64
MtrrPrecedence (
UINT64 MtrrType1,
UINT64 MtrrType2
)
{
UINT64 MtrrType;
MtrrType = MTRR_CACHE_INVALID_TYPE;
switch (MtrrType1) {
case MTRR_CACHE_UNCACHEABLE:
MtrrType = MTRR_CACHE_UNCACHEABLE;
break;
case MTRR_CACHE_WRITE_COMBINING:
if (
MtrrType2==MTRR_CACHE_WRITE_COMBINING ||
MtrrType2==MTRR_CACHE_UNCACHEABLE
) {
MtrrType = MtrrType2;
}
break;
case MTRR_CACHE_WRITE_THROUGH:
if (
MtrrType2==MTRR_CACHE_WRITE_THROUGH ||
MtrrType2==MTRR_CACHE_WRITE_BACK
) {
MtrrType = MTRR_CACHE_WRITE_THROUGH;
} else if(MtrrType2==MTRR_CACHE_UNCACHEABLE) {
MtrrType = MTRR_CACHE_UNCACHEABLE;
}
break;
case MTRR_CACHE_WRITE_PROTECTED:
if (MtrrType2 == MTRR_CACHE_WRITE_PROTECTED ||
MtrrType2 == MTRR_CACHE_UNCACHEABLE) {
MtrrType = MtrrType2;
}
break;
case MTRR_CACHE_WRITE_BACK:
if (
MtrrType2== MTRR_CACHE_UNCACHEABLE ||
MtrrType2==MTRR_CACHE_WRITE_THROUGH ||
MtrrType2== MTRR_CACHE_WRITE_BACK
) {
MtrrType = MtrrType2;
}
break;
case MTRR_CACHE_INVALID_TYPE:
MtrrType = MtrrType2;
break;
default:
break;
}
if (MtrrType2 == MTRR_CACHE_INVALID_TYPE) {
MtrrType = MtrrType1;
}
return MtrrType;
}
/**
This function attempts to set the attributes for a memory range.
@param BaseAddress The physical address that is the start
address of a memory region.
@param Length The size in bytes of the memory region.
@param Attributes The bit mask of attributes to set for the
memory region.
@retval RETURN_SUCCESS The attributes were set for the memory
region.
@retval RETURN_INVALID_PARAMETER Length is zero.
@retval RETURN_UNSUPPORTED The processor does not support one or
more bytes of the memory resource range
specified by BaseAddress and Length.
@retval RETURN_UNSUPPORTED The bit mask of attributes is not support
for the memory resource range specified
by BaseAddress and Length.
@retval RETURN_ACCESS_DENIED The attributes for the memory resource
range specified by BaseAddress and Length
cannot be modified.
@retval RETURN_OUT_OF_RESOURCES There are not enough system resources to
modify the attributes of the memory
resource range.
**/
RETURN_STATUS
EFIAPI
MtrrSetMemoryAttribute (
IN PHYSICAL_ADDRESS BaseAddress,
IN UINT64 Length,
IN MTRR_MEMORY_CACHE_TYPE Attribute
)
{
UINT64 TempQword;
RETURN_STATUS Status;
UINT64 MemoryType;
UINT64 Alignment;
BOOLEAN OverLap;
BOOLEAN Positive;
UINT32 MsrNum;
UINTN MtrrNumber;
VARIABLE_MTRR VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];
UINT32 UsedMtrr;
UINT64 MtrrValidBitsMask;
UINT64 MtrrValidAddressMask;
BOOLEAN OverwriteExistingMtrr;
UINT32 FirmwareVariableMtrrCount;
UINT32 VariableMtrrEnd;
MTRR_CONTEXT MtrrContext;
DEBUG((DEBUG_CACHE, "MtrrSetMemoryAttribute() %a:%016lx-%016lx\n", mMtrrMemoryCacheTypeShortName[Attribute], BaseAddress, Length));
if (!IsMtrrSupported ()) {
Status = RETURN_UNSUPPORTED;
goto Done;
}
FirmwareVariableMtrrCount = GetFirmwareVariableMtrrCount ();
VariableMtrrEnd = MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (2 * GetVariableMtrrCount ()) - 1;
MtrrLibInitializeMtrrMask(&MtrrValidBitsMask, &MtrrValidAddressMask);
TempQword = 0;
MemoryType = (UINT64)Attribute;
OverwriteExistingMtrr = FALSE;
//
// Check for an invalid parameter
//
if (Length == 0) {
Status = RETURN_INVALID_PARAMETER;
goto Done;
}
if (
(BaseAddress & ~MtrrValidAddressMask) != 0 ||
(Length & ~MtrrValidAddressMask) != 0
) {
Status = RETURN_UNSUPPORTED;
goto Done;
}
//
// Check if Fixed MTRR
//
Status = RETURN_SUCCESS;
while ((BaseAddress < BASE_1MB) && (Length > 0) && Status == RETURN_SUCCESS) {
PreMtrrChange (&MtrrContext);
Status = ProgramFixedMtrr (MemoryType, &BaseAddress, &Length);
PostMtrrChange (&MtrrContext);
if (RETURN_ERROR (Status)) {
goto Done;
}
}
if (Length == 0) {
//
// A Length of 0 can only make sense for fixed MTTR ranges.
// Since we just handled the fixed MTRRs, we can skip the
// variable MTRR section.
//
goto Done;
}
//
// Since memory ranges below 1MB will be overridden by the fixed MTRRs,
// we can set the base to 0 to save variable MTRRs.
//
if (BaseAddress == BASE_1MB) {
BaseAddress = 0;
Length += SIZE_1MB;
}
//
// Check for overlap
//
UsedMtrr = MtrrGetMemoryAttributeInVariableMtrr (MtrrValidBitsMask, MtrrValidAddressMask, VariableMtrr);
OverLap = CheckMemoryAttributeOverlap (BaseAddress, BaseAddress + Length - 1, VariableMtrr);
if (OverLap) {
Status = CombineMemoryAttribute (MemoryType, &BaseAddress, &Length, VariableMtrr, &UsedMtrr, &OverwriteExistingMtrr);
if (RETURN_ERROR (Status)) {
goto Done;
}
if (Length == 0) {
//
// Combined successfully, invalidate the now-unused MTRRs
//
InvalidateMtrr(VariableMtrr);
Status = RETURN_SUCCESS;
goto Done;
}
}
//
// The memory type is the same with the type specified by
// MTRR_LIB_IA32_MTRR_DEF_TYPE.
//
if ((!OverwriteExistingMtrr) && (Attribute == MtrrGetDefaultMemoryType ())) {
//
// Invalidate the now-unused MTRRs
//
InvalidateMtrr(VariableMtrr);
goto Done;
}
Positive = GetMtrrNumberAndDirection (BaseAddress, Length, &MtrrNumber);
if ((UsedMtrr + MtrrNumber) > FirmwareVariableMtrrCount) {
Status = RETURN_OUT_OF_RESOURCES;
goto Done;
}
//
// Invalidate the now-unused MTRRs
//
InvalidateMtrr(VariableMtrr);
//
// Find first unused MTRR
//
for (MsrNum = MTRR_LIB_IA32_VARIABLE_MTRR_BASE;
MsrNum < VariableMtrrEnd;
MsrNum += 2
) {
if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {
break;
}
}
if (BaseAddress != 0) {
do {
//
// Calculate the alignment of the base address.
//
Alignment = LShiftU64 (1, (UINTN)LowBitSet64 (BaseAddress));
if (Alignment > Length) {
break;
}
//
// Find unused MTRR
//
for (; MsrNum < VariableMtrrEnd; MsrNum += 2) {
if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {
break;
}
}
ProgramVariableMtrr (
MsrNum,
BaseAddress,
Alignment,
MemoryType,
MtrrValidAddressMask
);
BaseAddress += Alignment;
Length -= Alignment;
} while (TRUE);
if (Length == 0) {
goto Done;
}
}
TempQword = Length;
if (!Positive) {
Length = Power2MaxMemory (LShiftU64 (TempQword, 1));
//
// Find unused MTRR
//
for (; MsrNum < VariableMtrrEnd; MsrNum += 2) {
if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {
break;
}
}
ProgramVariableMtrr (
MsrNum,
BaseAddress,
Length,
MemoryType,
MtrrValidAddressMask
);
BaseAddress += Length;
TempQword = Length - TempQword;
MemoryType = MTRR_CACHE_UNCACHEABLE;
}
do {
//
// Find unused MTRR
//
for (; MsrNum < VariableMtrrEnd; MsrNum += 2) {
if ((AsmReadMsr64 (MsrNum + 1) & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {
break;
}
}
Length = Power2MaxMemory (TempQword);
if (!Positive) {
BaseAddress -= Length;
}
ProgramVariableMtrr (
MsrNum,
BaseAddress,
Length,
MemoryType,
MtrrValidAddressMask
);
if (Positive) {
BaseAddress += Length;
}
TempQword -= Length;
} while (TempQword > 0);
Done:
DEBUG((DEBUG_CACHE, " Status = %r\n", Status));
if (!RETURN_ERROR (Status)) {
MtrrDebugPrintAllMtrrs ();
}
return Status;
}
/**
This function will get the memory cache type of the specific address.
This function is mainly for debug purpose.
@param Address The specific address
@return Memory cache type of the sepcific address
**/
MTRR_MEMORY_CACHE_TYPE
EFIAPI
MtrrGetMemoryAttribute (
IN PHYSICAL_ADDRESS Address
)
{
UINT64 TempQword;
UINTN Index;
UINTN SubIndex;
UINT64 MtrrType;
UINT64 TempMtrrType;
MTRR_MEMORY_CACHE_TYPE CacheType;
VARIABLE_MTRR VariableMtrr[MTRR_NUMBER_OF_VARIABLE_MTRR];
UINT64 MtrrValidBitsMask;
UINT64 MtrrValidAddressMask;
UINTN VariableMtrrCount;
if (!IsMtrrSupported ()) {
return CacheUncacheable;
}
//
// Check if MTRR is enabled, if not, return UC as attribute
//
TempQword = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE);
MtrrType = MTRR_CACHE_INVALID_TYPE;
if ((TempQword & MTRR_LIB_CACHE_MTRR_ENABLED) == 0) {
return CacheUncacheable;
}
//
// If address is less than 1M, then try to go through the fixed MTRR
//
if (Address < BASE_1MB) {
if ((TempQword & MTRR_LIB_CACHE_FIXED_MTRR_ENABLED) != 0) {
//
// Go through the fixed MTRR
//
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
if (Address >= mMtrrLibFixedMtrrTable[Index].BaseAddress &&
Address < (
mMtrrLibFixedMtrrTable[Index].BaseAddress +
(mMtrrLibFixedMtrrTable[Index].Length * 8)
)
) {
SubIndex =
((UINTN)Address - mMtrrLibFixedMtrrTable[Index].BaseAddress) /
mMtrrLibFixedMtrrTable[Index].Length;
TempQword = AsmReadMsr64 (mMtrrLibFixedMtrrTable[Index].Msr);
MtrrType = RShiftU64 (TempQword, SubIndex * 8) & 0xFF;
return GetMemoryCacheTypeFromMtrrType (MtrrType);
}
}
}
}
MtrrLibInitializeMtrrMask(&MtrrValidBitsMask, &MtrrValidAddressMask);
MtrrGetMemoryAttributeInVariableMtrr(
MtrrValidBitsMask,
MtrrValidAddressMask,
VariableMtrr
);
//
// Go through the variable MTRR
//
VariableMtrrCount = GetVariableMtrrCount ();
ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
for (Index = 0; Index < VariableMtrrCount; Index++) {
if (VariableMtrr[Index].Valid) {
if (Address >= VariableMtrr[Index].BaseAddress &&
Address < VariableMtrr[Index].BaseAddress+VariableMtrr[Index].Length) {
TempMtrrType = VariableMtrr[Index].Type;
MtrrType = MtrrPrecedence (MtrrType, TempMtrrType);
}
}
}
CacheType = GetMemoryCacheTypeFromMtrrType (MtrrType);
return CacheType;
}
/**
This function will get the raw value in variable MTRRs
@param VariableSettings A buffer to hold variable MTRRs content.
@return The VariableSettings input pointer
**/
MTRR_VARIABLE_SETTINGS*
EFIAPI
MtrrGetVariableMtrr (
OUT MTRR_VARIABLE_SETTINGS *VariableSettings
)
{
UINT32 Index;
UINT32 VariableMtrrCount;
if (!IsMtrrSupported ()) {
return VariableSettings;
}
VariableMtrrCount = GetVariableMtrrCount ();
ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
for (Index = 0; Index < VariableMtrrCount; Index++) {
VariableSettings->Mtrr[Index].Base =
AsmReadMsr64 (MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1));
VariableSettings->Mtrr[Index].Mask =
AsmReadMsr64 (MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1) + 1);
}
return VariableSettings;
}
/**
Worker function setting variable MTRRs
@param VariableSettings A buffer to hold variable MTRRs content.
**/
VOID
MtrrSetVariableMtrrWorker (
IN MTRR_VARIABLE_SETTINGS *VariableSettings
)
{
UINT32 Index;
UINT32 VariableMtrrCount;
VariableMtrrCount = GetVariableMtrrCount ();
ASSERT (VariableMtrrCount <= MTRR_NUMBER_OF_VARIABLE_MTRR);
for (Index = 0; Index < VariableMtrrCount; Index++) {
AsmWriteMsr64 (
MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1),
VariableSettings->Mtrr[Index].Base
);
AsmWriteMsr64 (
MTRR_LIB_IA32_VARIABLE_MTRR_BASE + (Index << 1) + 1,
VariableSettings->Mtrr[Index].Mask
);
}
}
/**
This function sets variable MTRRs
@param VariableSettings A buffer to hold variable MTRRs content.
@return The pointer of VariableSettings
**/
MTRR_VARIABLE_SETTINGS*
EFIAPI
MtrrSetVariableMtrr (
IN MTRR_VARIABLE_SETTINGS *VariableSettings
)
{
MTRR_CONTEXT MtrrContext;
if (!IsMtrrSupported ()) {
return VariableSettings;
}
PreMtrrChange (&MtrrContext);
MtrrSetVariableMtrrWorker (VariableSettings);
PostMtrrChange (&MtrrContext);
return VariableSettings;
}
/**
This function gets the content in fixed MTRRs
@param FixedSettings A buffer to hold fixed Mtrrs content.
@retval The pointer of FixedSettings
**/
MTRR_FIXED_SETTINGS*
EFIAPI
MtrrGetFixedMtrr (
OUT MTRR_FIXED_SETTINGS *FixedSettings
)
{
UINT32 Index;
if (!IsMtrrSupported ()) {
return FixedSettings;
}
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
FixedSettings->Mtrr[Index] =
AsmReadMsr64 (mMtrrLibFixedMtrrTable[Index].Msr);
};
return FixedSettings;
}
/**
Worker function setting fixed MTRRs
@param FixedSettings A buffer to hold fixed Mtrrs content.
**/
VOID
MtrrSetFixedMtrrWorker (
IN MTRR_FIXED_SETTINGS *FixedSettings
)
{
UINT32 Index;
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
AsmWriteMsr64 (
mMtrrLibFixedMtrrTable[Index].Msr,
FixedSettings->Mtrr[Index]
);
}
}
/**
This function sets fixed MTRRs
@param FixedSettings A buffer to hold fixed Mtrrs content.
@retval The pointer of FixedSettings
**/
MTRR_FIXED_SETTINGS*
EFIAPI
MtrrSetFixedMtrr (
IN MTRR_FIXED_SETTINGS *FixedSettings
)
{
MTRR_CONTEXT MtrrContext;
if (!IsMtrrSupported ()) {
return FixedSettings;
}
PreMtrrChange (&MtrrContext);
MtrrSetFixedMtrrWorker (FixedSettings);
PostMtrrChange (&MtrrContext);
return FixedSettings;
}
/**
This function gets the content in all MTRRs (variable and fixed)
@param MtrrSetting A buffer to hold all Mtrrs content.
@retval the pointer of MtrrSetting
**/
MTRR_SETTINGS *
EFIAPI
MtrrGetAllMtrrs (
OUT MTRR_SETTINGS *MtrrSetting
)
{
if (!IsMtrrSupported ()) {
return MtrrSetting;
}
//
// Get fixed MTRRs
//
MtrrGetFixedMtrr (&MtrrSetting->Fixed);
//
// Get variable MTRRs
//
MtrrGetVariableMtrr (&MtrrSetting->Variables);
//
// Get MTRR_DEF_TYPE value
//
MtrrSetting->MtrrDefType = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE);
return MtrrSetting;
}
/**
This function sets all MTRRs (variable and fixed)
@param MtrrSetting A buffer holding all MTRRs content.
@retval The pointer of MtrrSetting
**/
MTRR_SETTINGS *
EFIAPI
MtrrSetAllMtrrs (
IN MTRR_SETTINGS *MtrrSetting
)
{
MTRR_CONTEXT MtrrContext;
if (!IsMtrrSupported ()) {
return MtrrSetting;
}
PreMtrrChange (&MtrrContext);
//
// Set fixed MTRRs
//
MtrrSetFixedMtrrWorker (&MtrrSetting->Fixed);
//
// Set variable MTRRs
//
MtrrSetVariableMtrrWorker (&MtrrSetting->Variables);
//
// Set MTRR_DEF_TYPE value
//
AsmWriteMsr64 (MTRR_LIB_IA32_MTRR_DEF_TYPE, MtrrSetting->MtrrDefType);
PostMtrrChangeEnableCache (&MtrrContext);
return MtrrSetting;
}
/**
This function prints all MTRRs for debugging.
**/
VOID
EFIAPI
MtrrDebugPrintAllMtrrs (
VOID
)
{
DEBUG_CODE (
MTRR_SETTINGS MtrrSettings;
UINTN Index;
UINTN Index1;
UINTN VariableMtrrCount;
UINT64 Base;
UINT64 Limit;
UINT64 MtrrBase;
UINT64 MtrrLimit;
UINT64 RangeBase;
UINT64 RangeLimit;
UINT64 NoRangeBase;
UINT64 NoRangeLimit;
UINT32 RegEax;
UINTN MemoryType;
UINTN PreviousMemoryType;
BOOLEAN Found;
if (!IsMtrrSupported ()) {
return;
}
DEBUG((DEBUG_CACHE, "MTRR Settings\n"));
DEBUG((DEBUG_CACHE, "=============\n"));
MtrrGetAllMtrrs (&MtrrSettings);
DEBUG((DEBUG_CACHE, "MTRR Default Type: %016lx\n", MtrrSettings.MtrrDefType));
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
DEBUG((DEBUG_CACHE, "Fixed MTRR[%02d] : %016lx\n", Index, MtrrSettings.Fixed.Mtrr[Index]));
}
VariableMtrrCount = GetVariableMtrrCount ();
for (Index = 0; Index < VariableMtrrCount; Index++) {
DEBUG((DEBUG_CACHE, "Variable MTRR[%02d]: Base=%016lx Mask=%016lx\n",
Index,
MtrrSettings.Variables.Mtrr[Index].Base,
MtrrSettings.Variables.Mtrr[Index].Mask
));
}
DEBUG((DEBUG_CACHE, "\n"));
DEBUG((DEBUG_CACHE, "MTRR Ranges\n"));
DEBUG((DEBUG_CACHE, "====================================\n"));
Base = 0;
PreviousMemoryType = MTRR_CACHE_INVALID_TYPE;
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
Base = mMtrrLibFixedMtrrTable[Index].BaseAddress;
for (Index1 = 0; Index1 < 8; Index1++) {
MemoryType = (UINTN)(RShiftU64 (MtrrSettings.Fixed.Mtrr[Index], Index1 * 8) & 0xff);
if (MemoryType > CacheWriteBack) {
MemoryType = MTRR_CACHE_INVALID_TYPE;
}
if (MemoryType != PreviousMemoryType) {
if (PreviousMemoryType != MTRR_CACHE_INVALID_TYPE) {
DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));
}
PreviousMemoryType = MemoryType;
DEBUG((DEBUG_CACHE, "%a:%016lx-", mMtrrMemoryCacheTypeShortName[MemoryType], Base));
}
Base += mMtrrLibFixedMtrrTable[Index].Length;
}
}
DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));
VariableMtrrCount = GetVariableMtrrCount ();
Limit = BIT36 - 1;
AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);
if (RegEax >= 0x80000008) {
AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);
Limit = LShiftU64 (1, RegEax & 0xff) - 1;
}
Base = BASE_1MB;
PreviousMemoryType = MTRR_CACHE_INVALID_TYPE;
do {
MemoryType = MtrrGetMemoryAttribute (Base);
if (MemoryType > CacheWriteBack) {
MemoryType = MTRR_CACHE_INVALID_TYPE;
}
if (MemoryType != PreviousMemoryType) {
if (PreviousMemoryType != MTRR_CACHE_INVALID_TYPE) {
DEBUG((DEBUG_CACHE, "%016lx\n", Base - 1));
}
PreviousMemoryType = MemoryType;
DEBUG((DEBUG_CACHE, "%a:%016lx-", mMtrrMemoryCacheTypeShortName[MemoryType], Base));
}
RangeBase = BASE_1MB;
NoRangeBase = BASE_1MB;
RangeLimit = Limit;
NoRangeLimit = Limit;
for (Index = 0, Found = FALSE; Index < VariableMtrrCount; Index++) {
if ((MtrrSettings.Variables.Mtrr[Index].Mask & BIT11) == 0) {
//
// If mask is not valid, then do not display range
//
continue;
}
MtrrBase = (MtrrSettings.Variables.Mtrr[Index].Base & (~(SIZE_4KB - 1)));
MtrrLimit = MtrrBase + ((~(MtrrSettings.Variables.Mtrr[Index].Mask & (~(SIZE_4KB - 1)))) & Limit);
if (Base >= MtrrBase && Base < MtrrLimit) {
Found = TRUE;
}
if (Base >= MtrrBase && MtrrBase > RangeBase) {
RangeBase = MtrrBase;
}
if (Base > MtrrLimit && MtrrLimit > RangeBase) {
RangeBase = MtrrLimit + 1;
}
if (Base < MtrrBase && MtrrBase < RangeLimit) {
RangeLimit = MtrrBase - 1;
}
if (Base < MtrrLimit && MtrrLimit <= RangeLimit) {
RangeLimit = MtrrLimit;
}
if (Base > MtrrLimit && NoRangeBase < MtrrLimit) {
NoRangeBase = MtrrLimit + 1;
}
if (Base < MtrrBase && NoRangeLimit > MtrrBase) {
NoRangeLimit = MtrrBase - 1;
}
}
if (Found) {
Base = RangeLimit + 1;
} else {
Base = NoRangeLimit + 1;
}
} while (Base < Limit);
DEBUG((DEBUG_CACHE, "%016lx\n\n", Base - 1));
);
}
/**
Checks if MTRR is supported.
@retval TRUE MTRR is supported.
@retval FALSE MTRR is not supported.
**/
BOOLEAN
EFIAPI
IsMtrrSupported (
VOID
)
{
UINT32 RegEdx;
UINT64 MtrrCap;
//
// Check CPUID(1).EDX[12] for MTRR capability
//
AsmCpuid (1, NULL, NULL, NULL, &RegEdx);
if (BitFieldRead32 (RegEdx, 12, 12) == 0) {
return FALSE;
}
//
// Check IA32_MTRRCAP.[0..7] for number of variable MTRRs and IA32_MTRRCAP[8] for
// fixed MTRRs existence. If number of variable MTRRs is zero, or fixed MTRRs do not
// exist, return false.
//
MtrrCap = AsmReadMsr64 (MTRR_LIB_IA32_MTRR_CAP);
if ((BitFieldRead64 (MtrrCap, 0, 7) == 0) || (BitFieldRead64 (MtrrCap, 8, 8) == 0)) {
return FALSE;
}
return TRUE;
}
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