diff options
| author | Dong, Eric <eric.dong@intel.com> | 2019-08-16 11:57:25 +0800 |
|---|---|---|
| committer | Ray Ni <ray.ni@intel.com> | 2019-08-21 02:44:48 +0800 |
| commit | 35c2809ba6a510182dc704fd59952d54695299f8 (patch) | |
| tree | 8f07a486d9175ddecb5ffe42b90ecfcbc4f2543d /UefiCpuPkg/Library | |
| parent | 4201098e97fe53275638ebc64e9aa90b537199b9 (diff) | |
| download | edk2-35c2809ba6a510182dc704fd59952d54695299f8.tar.gz edk2-35c2809ba6a510182dc704fd59952d54695299f8.tar.bz2 edk2-35c2809ba6a510182dc704fd59952d54695299f8.zip | |
UefiCpuPkg/RegisterCpuFeaturesLib: Add "Test Then Write" Macros.
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2040
Add below new micros which test the current value before write the new
value. Only write new value when current value not same as new value.
CPU_REGISTER_TABLE_TEST_THEN_WRITE32
CPU_REGISTER_TABLE_TEST_THEN_WRITE64
CPU_REGISTER_TABLE_TEST_THEN_WRITE_FIELD
Also add below API:
CpuRegisterTableTestThenWrite
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Cc: Star Zeng <star.zeng@intel.com>
Diffstat (limited to 'UefiCpuPkg/Library')
| -rw-r--r-- | UefiCpuPkg/Library/RegisterCpuFeaturesLib/RegisterCpuFeaturesLib.c | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/RegisterCpuFeaturesLib.c b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/RegisterCpuFeaturesLib.c index 67885bf69b..58910b8891 100644 --- a/UefiCpuPkg/Library/RegisterCpuFeaturesLib/RegisterCpuFeaturesLib.c +++ b/UefiCpuPkg/Library/RegisterCpuFeaturesLib/RegisterCpuFeaturesLib.c @@ -1025,6 +1025,8 @@ EnlargeRegisterTable ( @param[in] ValidBitStart Start of the bit section
@param[in] ValidBitLength Length of the bit section
@param[in] Value Value to write
+ @param[in] TestThenWrite Whether need to test current Value before writing.
+
**/
VOID
CpuRegisterTableWriteWorker (
@@ -1034,7 +1036,8 @@ CpuRegisterTableWriteWorker ( IN UINT64 Index,
IN UINT8 ValidBitStart,
IN UINT8 ValidBitLength,
- IN UINT64 Value
+ IN UINT64 Value,
+ IN BOOLEAN TestThenWrite
)
{
CPU_FEATURES_DATA *CpuFeaturesData;
@@ -1070,6 +1073,7 @@ CpuRegisterTableWriteWorker ( RegisterTableEntry[RegisterTable->TableLength].ValidBitStart = ValidBitStart;
RegisterTableEntry[RegisterTable->TableLength].ValidBitLength = ValidBitLength;
RegisterTableEntry[RegisterTable->TableLength].Value = Value;
+ RegisterTableEntry[RegisterTable->TableLength].TestThenWrite = TestThenWrite;
RegisterTable->TableLength++;
}
@@ -1105,7 +1109,41 @@ CpuRegisterTableWrite ( Start = (UINT8)LowBitSet64 (ValueMask);
End = (UINT8)HighBitSet64 (ValueMask);
Length = End - Start + 1;
- CpuRegisterTableWriteWorker (FALSE, ProcessorNumber, RegisterType, Index, Start, Length, Value);
+ CpuRegisterTableWriteWorker (FALSE, ProcessorNumber, RegisterType, Index, Start, Length, Value, FALSE);
+}
+
+/**
+ Adds an entry in specified register table.
+
+ This function adds an entry in specified register table, with given register type,
+ register index, bit section and value.
+
+ @param[in] ProcessorNumber The index of the CPU to add a register table entry
+ @param[in] RegisterType Type of the register to program
+ @param[in] Index Index of the register to program
+ @param[in] ValueMask Mask of bits in register to write
+ @param[in] Value Value to write
+
+ @note This service could be called by BSP only.
+**/
+VOID
+EFIAPI
+CpuRegisterTableTestThenWrite (
+ IN UINTN ProcessorNumber,
+ IN REGISTER_TYPE RegisterType,
+ IN UINT64 Index,
+ IN UINT64 ValueMask,
+ IN UINT64 Value
+ )
+{
+ UINT8 Start;
+ UINT8 End;
+ UINT8 Length;
+
+ Start = (UINT8)LowBitSet64 (ValueMask);
+ End = (UINT8)HighBitSet64 (ValueMask);
+ Length = End - Start + 1;
+ CpuRegisterTableWriteWorker (FALSE, ProcessorNumber, RegisterType, Index, Start, Length, Value, TRUE);
}
/**
@@ -1139,7 +1177,7 @@ PreSmmCpuRegisterTableWrite ( Start = (UINT8)LowBitSet64 (ValueMask);
End = (UINT8)HighBitSet64 (ValueMask);
Length = End - Start + 1;
- CpuRegisterTableWriteWorker (TRUE, ProcessorNumber, RegisterType, Index, Start, Length, Value);
+ CpuRegisterTableWriteWorker (TRUE, ProcessorNumber, RegisterType, Index, Start, Length, Value, FALSE);
}
/**
|