--- 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. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
