PCI IDE Controller: Difference between revisions
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===Read From ATAPI Drive=== |
===Read From ATAPI Drive=== |
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Let's move to a part which is quite easier, it is to read from ATAPI Drive, i will not make the function write to ATAPI Drive, because the write Operation is very |
Let's move to a part which is quite easier, it is to read from ATAPI Drive, i will not make the function write to ATAPI Drive, because the write Operation is very complex and it should done by third-party tools (like Nero in Windows, and Brasero in Linux). |
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ATAPI Drive is different from ATA Drives, as it doesn't use ATA Commands, but it use the SCSI-Command-Set. Parameters are sent into a Packet, so it is Called: ATA-Packet Interface [ATAPI]. |
ATAPI Drive is different from ATA Drives, as it doesn't use ATA Commands, but it use the SCSI-Command-Set. Parameters are sent into a Packet, so it is Called: ATA-Packet Interface [ATAPI]. |
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</source> |
</source> |
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by this way, ide_wait_irq() will go into a while loop, which waits for the variable ide_irq_invoked to be set, then |
by this way, ide_wait_irq() will go into a while loop, which waits for the variable ide_irq_invoked to be set, then clears it. |
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<source lang="c"> |
<source lang="c"> |
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* drive, is the drive number, which is from 0 to 3. |
* drive, is the drive number, which is from 0 to 3. |
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* lba, the lba address. |
* lba, the lba address. |
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* numsects, number of sectors, it should always be 1, and if you wanna read more than one sector, re-execute this |
* numsects, number of sectors, it should always be 1, and if you wanna read more than one sector, re-execute this function with updated LBA address. |
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* selector, Segment Selector. |
* selector, Segment Selector. |
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* edi, offset in the selector. |
* edi, offset in the selector. |
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<source lang="c"> |
<source lang="c"> |
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// (IX): |
// (IX): Receiving Data: |
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// ------------------------------------------------------------------ |
// ------------------------------------------------------------------ |
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for (i = 0; i < numsects; i++) { |
for (i = 0; i < numsects; i++) { |
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