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1. Fix bug in some boundary cases to calculate SectorCountExp. 

2. Add assertion to ensure the boolean value must be 0 or 1 before the use of array index

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9597 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8 2009-12-24 08:31:31 +00:00
parent a115836609
commit 423401f9ea
1 changed files with 13 additions and 4 deletions
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17
MdeModulePkg/Bus/Ata/AtaBusDxe/AtaPassThruExecute.c
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@ -408,6 +408,11 @@ TransferAtaDevice (
EFI_ATA_COMMAND_BLOCK *Acb;
EFI_ATA_PASS_THRU_COMMAND_PACKET *Packet;
//
// Ensure AtaDevice->Lba48Bit and IsWrite are valid boolean values
//
ASSERT ((UINTN) AtaDevice->Lba48Bit < 2);
ASSERT ((UINTN) IsWrite < 2);
//
// Prepare for ATA command block.
//
@ -417,15 +422,15 @@ TransferAtaDevice (
Acb->AtaCylinderLow = (UINT8) RShiftU64 (StartLba, 8);
Acb->AtaCylinderHigh = (UINT8) RShiftU64 (StartLba, 16);
Acb->AtaDeviceHead = (UINT8) (BIT7 | BIT6 | BIT5 | (AtaDevice->PortMultiplierPort << 4));
Acb->AtaSectorCount = (UINT8) TransferLength;
if (AtaDevice->Lba48Bit) {
Acb->AtaSectorNumberExp = (UINT8) RShiftU64 (StartLba, 24);
Acb->AtaCylinderLowExp = (UINT8) RShiftU64 (StartLba, 32);
Acb->AtaCylinderHighExp = (UINT8) RShiftU64 (StartLba, 40);
Acb->AtaSectorCountExp = (UINT8) (TransferLength >> 8);
} else {
Acb->AtaDeviceHead = (UINT8) (Acb->AtaDeviceHead | RShiftU64 (StartLba, 24));
}
Acb->AtaCylinderLowExp = (UINT8) RShiftU64 (StartLba, 32);
Acb->AtaCylinderHighExp = (UINT8) RShiftU64 (StartLba, 40);
Acb->AtaSectorCount = (UINT8) TransferLength;
Acb->AtaSectorCountExp = (UINT8) (TransferLength >> 8);
//
// Prepare for ATA pass through packet.
@ -475,6 +480,10 @@ AccessAtaDevice(
UINTN TransferBlockNumber;
UINTN BlockSize;
//
// Ensure AtaDevice->Lba48Bit is a valid boolean value
//
ASSERT ((UINTN) AtaDevice->Lba48Bit < 2);
MaxTransferBlockNumber = mMaxTransferBlockNumber[AtaDevice->Lba48Bit];
BlockSize = AtaDevice->BlockMedia.BlockSize;
do {