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/** @file
Null instance of Memory Test Library.
Copyright (c) 2009, Intel Corporation.<BR>
All rights reserved. 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/BaseMemoryTestLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/ReportStatusCodeLib.h>
UINT32 TestPattern[] = {
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5,
0x5a5a5a5a,
0xa5a5a5a5
};
/**
Internal function to compare two memory buffers of a given length.
This is the internal function to compare two memory buffers. We cannot
use CompareMem() in BaseLib, for that function ASSERT when buffer address
is zero.
@param DestinationBuffer First memory buffer
@param SourceBuffer Second memory buffer
@param Length Length of DestinationBuffer and SourceBuffer memory
regions to compare.
@return 0 All Length bytes of the two buffers are identical.
@retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first
mismatched byte in DestinationBuffer.
**/
INTN
CompareMemoryWorker (
IN CONST VOID *DestinationBuffer,
IN CONST VOID *SourceBuffer,
IN UINTN Length
)
{
while ((--Length != 0) &&
(*(INT8*)DestinationBuffer == *(INT8*)SourceBuffer)) {
DestinationBuffer = (INT8*)DestinationBuffer + 1;
SourceBuffer = (INT8*)SourceBuffer + 1;
}
return (INTN)*(UINT8*)DestinationBuffer - (INTN)*(UINT8*)SourceBuffer;
}
/**
Internal worker function for system memory range test.
This function is the internal worker function for system memory range test.
It writes test pattern to memory range and then reads back to check if memory
works well.
@param StartAddress Start address of the memory range to test.
@param Length Length of the memory range to test.
@param ErrorAddress Address of the memory where error is encountered.
@retval RETURN_SUCCESS The memory range passes test.
@retval RETURN_DEVICE_ERROR The memory range does not pass test.
**/
RETURN_STATUS
MemoryTestWorker (
IN VOID *StartAddress,
IN UINT64 Length,
IN UINTN SpanSize,
OUT VOID **ErrorAddress
)
{
VOID *TempAddress;
//
// Make sure we don't try and test anything above the max physical address range
//
ASSERT ((UINTN) StartAddress + Length < MAX_ADDRESS);
REPORT_STATUS_CODE (EFI_PROGRESS_CODE, PcdGet32 (PcdStatusCodeValueMemoryTestStarted));
//
// Write the test pattern into memory range
//
TempAddress = StartAddress;
while ((UINTN) TempAddress < (UINTN) StartAddress + Length) {
CopyMem (TempAddress, TestPattern, sizeof (TestPattern));
TempAddress = (VOID *) ((UINTN) TempAddress + SpanSize);
}
//
// Write back and invalidate cache to make sure data is in memory
//
WriteBackInvalidateDataCacheRange (StartAddress, (UINTN) Length);
//
// Read pattern from memory and compare it
//
TempAddress = StartAddress;
while ((UINTN) TempAddress < (UINTN) StartAddress + Length) {
if (CompareMemoryWorker (TempAddress, TestPattern, sizeof (TestPattern)) != 0) {
//
// Value read back does not equal to the value written, so error is detected.
//
*ErrorAddress = TempAddress;
REPORT_STATUS_CODE (EFI_ERROR_CODE | EFI_ERROR_UNRECOVERED, PcdGet32 (PcdStatusCodeValueUncorrectableMemoryError));
return RETURN_DEVICE_ERROR;
}
TempAddress = (VOID *) ((UINTN) TempAddress + SpanSize);
}
return RETURN_SUCCESS;
}
/**
Perform a quick system memory range test.
This function performs a quick system memory range test. It leads to quick performance
but least reliability.
@param StartAddress Start address of the memory range to test.
@param Length Length of the memory range to test.
@param ErrorAddress Address of the memory where error is encountered.
@retval RETURN_SUCCESS The memory range passes test.
@retval RETURN_DEVICE_ERROR The memory range does not pass test.
**/
RETURN_STATUS
EFIAPI
QuickMemoryTest (
IN VOID *StartAddress,
IN UINT64 Length,
OUT VOID **ErrorAddress
)
{
RETURN_STATUS Status;
Status = MemoryTestWorker (
StartAddress,
Length,
sizeof (TestPattern) * 0x20000,
ErrorAddress
);
return Status;
}
/**
Test a system memory range with sparsely sampled memory units.
This function tests a system memory range, whose memory units
are sampled sparsely. It leads to relatively good performance
and partial reliability.
@param StartAddress Start address of the memory range to test.
@param Length Length of the memory range to test.
@param ErrorAddress Address of the memory where error is encountered.
@retval RETURN_SUCCESS The memory range passes test.
@retval RETURN_DEVICE_ERROR The memory range does not pass test.
**/
RETURN_STATUS
EFIAPI
SparseMemoryTest (
IN VOID *StartAddress,
IN UINT64 Length,
OUT VOID **ErrorAddress
)
{
RETURN_STATUS Status;
Status = MemoryTestWorker (
StartAddress,
Length,
sizeof (TestPattern) * 0x8000,
ErrorAddress
);
return Status;
}
/**
Test a system memory range with extensively sampled memory units.
This function tests a system memory range, whose memory units
are sampled extensively. Compared with SparseMemoryTest, it achieves
more reliability and less performance.
@param StartAddress Start address of the memory range to test.
@param Length Length of the memory range to test.
@param ErrorAddress Address of the memory where error is encountered.
@retval RETURN_SUCCESS The memory range passes test.
@retval RETURN_DEVICE_ERROR The memory range does not pass test.
**/
RETURN_STATUS
EFIAPI
ExtensiveMemoryTest (
IN VOID *StartAddress,
IN UINT64 Length,
OUT VOID **ErrorAddress
)
{
RETURN_STATUS Status;
Status = MemoryTestWorker (
StartAddress,
Length,
sizeof (TestPattern),
ErrorAddress
);
return Status;
}
/**
Check if soft ECC initialzation is needed for system
@retval TRUE Soft ECC initialzation is needed.
@retval FALSE Soft ECC initialzation is not needed.
**/
BOOLEAN
EFIAPI
IsSoftEccInitRequired (
VOID
)
{
return FALSE;
}
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