Re: Generic Disk Driver in Linux

[Aleksey Gorelov]

--- Phillip Susi <psusi@xxxxxxxxxx> wrote:

> The int 13 calls to the bios can only accept addresses within the first 
> 1 MB of memory, and the calls are synchronous, so DMA really doesn't 
> matter as the cpu will be busy waiting anyhow while the IO takes place, 
> which will wreak all kinds of hell on the rest of the running system, 
> including other hardware ISRs.
> 
  Not that easy. Once you start int13 transfer, your vm86 thread may be 
preempted to allow cpu doing something useful, including other ISRs processing.
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