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FDCMotorTask was patched to use 64-bit variables, preserve DOR contents when setting the motor bits, and properly set the block device's motor state. FDCMotor now properly checks the current motor status before writing to the DOR or spawning the power-off task, and also preserves the DOR bits.
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I have patched FDCReset to actually do its job correctly, switching it over to DOR-twiddling instead of the DSR method. I also allowed it to skip the interrupt checks if it gets a 0x80 byte back at any point.
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FDCReadByte and FDCSendByte have been updated to store the MSR contents into a separate variable for readability. They also now Yield; when polling to prevent the OS from feezing.
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Since KInts.HC is compiled before DskFDC.HC, undefined symbol issues could possibly occur. when attempting to compile the interrupt set-up code because the IRQ handler is not yet compiled. To prevent this, I separated the IRQ handler into another file that is included immediately after the headers. The instructions have been updated to reflect this change.
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Some of the patches are applied to files in subdirectories of ::/Kernel and ::/Adam. The directory tree has been re-arranged in such a way as to allow them to be #included without having the compiler backtrack to their parent directory.
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I have added the "PURPOSE", "TO USE", and "THEN" tags to make the information sections more easy to read while keeping line length down. These are used by a Python script I wrote to generate an instruction file.
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The IRQ handlers in TempleOS' kernel code have an "IRQ_" prefix. FDCInt has been renamed to IRQ_FDC in keeping with Terry's code style. An unused definition of the same name has also been removed from KFloppyA.HH.
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I added comments to all patch files explaining their function and how to install them. Installation instructions were also added to some of the code files as well.
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The Bt call was modified to test for the corrrect bit of SRA.
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FDCWriteBlks now checks if the disk is write-protected before attempting a write, throwing an exception if it is. I also reworked the retry check for both it and FDCReadBlks.
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I realized that the logic that determined the sector size value sent to the controller would not work properly on larger sector size, so I redid it.
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I have added a function that will check for the presence of valid sector data on either side of a floppy disk. This function is used to check for the presence of a disk in a way that does not rely on the proper handling of the disk change flag.
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I moved the version check into the drive-0-only code; it wouldn't make sense to check the version each time a drive gets initialized.
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I have decided not to use multi-track mode and instead do atomic reads and writes to sector ranges. I have also added a timeout to the motor command when the motor is turned on (approximately 500 milliseconds to accomodate 5ΒΌ" drives). FDCInit now sets the highest-accessible block.
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This is the initial commit for the BlkDev-ified driver. It is not at all
in a working state at this point, and the old files have been left for
reference purposes.
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