Dear Avadh,
I am Ishwar Singh Bhati, PhD student in UMCP. We are integrating the
DiskSim or FlashDim simulator with the MARSS.
I was trying to understand how Hard Disk requests are handled by
PTLsim/QEMU. And at the same time how the time dilation
for the hard disk request is simulated in the PTLSim. Like, how many
simulation cycles PTLSIM will advance, for a Disk data request.
From my understanding, for a File I/O request, processor will switch to
kernel mode and write in to the dma registers to read/write from the
Disk. And once the
dma has completed the request, it will interrupt the processor that it
has completed the request. And then processor will come back to user
mode and execute the next
instructions. But, how the number of simulation cycles are increasing
when DMA is accessing the IDE disk in the QEMU.
Please help me in understanding, how QEMU and PTLSim are interacting for
the Disk requests. And how the clock cycles are advancing.
Thanks
Ishwar
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