On 1/15/2014 9:27 PM, Charles Steinkuehler wrote: > On 1/14/2014 8:38 PM, Charles Steinkuehler wrote: >> On 1/14/2014 5:34 AM, andy pugh wrote: >>> Someone on the forum is trying to write a driver for some onboard GPIO >>> that needs to be enabled via an INT 15. The sample assembler is: >>> >>> MOV AX, 6F08H Sets the digital port as input >>> INT 15H Initiates the INT 15H >>> >>> Is it reasonable/legitimate to do this with inline assembler in a .comp >>> file? >>> >>> Having never tried to use inline assembler, what would it look like? I >>> guess we need to put ax back to where it was afterwards? >>> >>> Is there a linux system call to achieve the same result? >> Not to derail this thread from the "I used to have to enter hex machine >> instructions by hand with toggle switches, and it was up-hill both >> ways!" reminiscing, but it should be OK to do an INT instruction or make >> kernel calls in the setup portion of a HAL component. Of course the >> execution mode and the interrupt need to agree on things like the >> current operating context of the CPU (no calling 16-bit BIOS routines >> from 32-bit PAE code!). > I was reading a bit more about this today, and apparently how the > graphics applications do this is to include a virtual x86 machines for > the sole purpose of being able to execute INT calls to the on-board > video BIOS for GPUs (which is the only way they can be properly setup on > some systems, particularly non-x86 machines with undocumented hardware > and closed-source GPU drivers). > > https://lists.sourceforge.net/lists/listinfo/emc-developers
That makes sense. But in this GPIO application, unless the INT 15 vector pointer has an interrupt service routine already attached to it via a driver, to service the I/O, I doubt that running the code below is going to have the desired effect. MOV AX, 6F08H Sets the digital port as input INT 15H Initiates the INT 15H Dave ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
