diff options
| -rw-r--r-- | IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BiosInt13.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BiosInt13.c b/IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BiosInt13.c index c53490b0e3..63aa1a22c1 100644 --- a/IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BiosInt13.c +++ b/IntelFrameworkModulePkg/Csm/BiosThunk/BlockIoDxe/BiosInt13.c @@ -864,8 +864,13 @@ Edd11BiosReadBlocks ( AddressPacket->Zero = 0;
AddressPacket->NumberOfBlocks = (UINT8) NumberOfBlocks;
AddressPacket->Zero2 = 0;
- AddressPacket->SegOffset = EFI_SEGMENT (TransferBuffer) << 16;
- AddressPacket->SegOffset |= EFI_OFFSET (TransferBuffer);
+ //
+ // TransferBuffer has been 4KB alignment. Normalize TransferBuffer to make offset as 0 in seg:offset
+ // format to transfer maximum 127 blocks of data.
+ // Otherwise when offset adding data size exceeds 0xFFFF, if OpROM does not normalize TransferBuffer,
+ // INT13 function 42H will return data boundary error 09H.
+ //
+ AddressPacket->SegOffset = (UINT32) ((TransferBuffer >> 4) << 16);
AddressPacket->Lba = (UINT64) Lba;
Regs.H.AH = 0x42;
@@ -1012,8 +1017,13 @@ Edd11BiosWriteBlocks ( AddressPacket->Zero = 0;
AddressPacket->NumberOfBlocks = (UINT8) NumberOfBlocks;
AddressPacket->Zero2 = 0;
- AddressPacket->SegOffset = EFI_SEGMENT (TransferBuffer) << 16;
- AddressPacket->SegOffset |= EFI_OFFSET (TransferBuffer);
+ //
+ // TransferBuffer has been 4KB alignment. Normalize TransferBuffer to make offset as 0 in seg:offset
+ // format to transfer maximum 127 blocks of data.
+ // Otherwise when offset adding data size exceeds 0xFFFF, if OpROM does not normalize TransferBuffer,
+ // INT13 function 42H will return data boundary error 09H.
+ //
+ AddressPacket->SegOffset = (UINT32) ((TransferBuffer >> 4) << 16);
AddressPacket->Lba = (UINT64) Lba;
Regs.H.AH = 0x43;
|