Hello
http://msdn.microsoft.com/en-us/library/windows/hardware/ff551322(v=vs.85).aspx
I’m trying to read a few sectors with ATA pass through interface (APTI), that works when I read the MBR because we read sector 0, of size 1. So even with putting shit into the CurrentTaskFile that works because almost all the fields are 0.
Now I’m trying to read in a given place, let’s say sector 4000 (decimal) and that doesn’t work.
The definition of CurrentTaskFile isn’t the same on several places.
On MSDN it’s the following (CHS):
[quote]0 Features Register
1 Sector Count Register
2 Sector Number Register
3 Cylinder Low Register
4 Cylinder High Register
5 Device/Head Register
6 Command Register
7 Reserved[/quote]
And on a source I found: http://www.smartmontools.org/browser/trunk/smartmontools/scsiata.cpp#L229 as well as t10 documentation ftp://ftp.t10.org/t10/document.04/04-262r8.pdf
it’s using an ATA command of size 12 or 16 (while ATA_PASS_THROUGH_DIRECT structure has CurrentTaskFile of size 8), and they put LBA inside while MSDN tells to use CHS.
What is the correct way to use it?
My code:
void Disk::FillAPTI(PATA_PASS_THROUGH_DIRECT pATAData, bool write, BYTE\* outBuff, int sizeBuff, int nbSectors, int sectorOffset, CHS sectorNum, UCHAR command, bool useDMA)
{
//http://msdn.microsoft.com/en-us/library/windows/hardware/ff551322%28v=vs.85%29.aspx
//Clear the contents
ZeroMemory(pATAData, sizeof(ATA_PASS_THROUGH_DIRECT));
// Init input / output buffs
ZeroMemory(outBuff, sizeBuff);
//Fill in query data
pATAData-\>Length = sizeof(ATA_PASS_THROUGH_DIRECT);
pATAData-\>AtaFlags = (write ? ATA_FLAGS_DATA_OUT : ATA_FLAGS_DATA_IN) | (useDMA ? ATA_FLAGS_USE_DMA : 0) | ATA_FLAGS_DRDY_REQUIRED | (nbSectors == 1 ? ATA_FLAGS_NO_MULTIPLE : 0);
pATAData-\>PathId = 0; // Set by the port driver
pATAData-\>TargetId = 0; // Set by the port driver
pATAData-\>Lun = 0; // Set by the port driver
pATAData-\>DataTransferLength = sizeBuff;
pATAData-\>TimeOutValue = 5; //Seconds
pATAData-\>DataBuffer = outBuff;
// http://msdn.microsoft.com/en-us/library/windows/hardware/ff559015%28v=vs.85%29.aspx
PIDEREGS pIdeRegs = (PIDEREGS) &pATAData-\>CurrentTaskFile[0];
pIdeRegs-\>bFeaturesReg = 0x0; //Feature ID
pIdeRegs-\>bSectorCountReg = LOBYTE(LOWORD(nbSectors); //Number of sectors
pIdeRegs-\>bSectorNumberReg = LOBYTE(LOWORD(sectorNum.Sector));
pIdeRegs-\>bCylLowReg = LOBYTE(LOWORD(sectorNum.Cylinder));
pIdeRegs-\>bCylHighReg = HIBYTE(LOWORD(sectorNum.Cylinder));
pIdeRegs-\>bDriveHeadReg = LOBYTE(LOWORD(sectorNum.Head));
pIdeRegs-\>bCommandReg = command; //Command
pIdeRegs-\>bReserved = 0x0; //Res
}
How am I supposed to pass that CDB block? Is it the same as CurrentTaskFile?
