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| About site: Software/Operating Systems/Microkernel/VSTa - VSTa work |
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| About site: http://www.zip.com.au/~jeremy/VSTa.html |
Title: Software/Operating Systems/Microkernel/VSTa - VSTa work Jeremy's code hack to talk to PCI BIOS.
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Prioria_Robotics Maker of the Merlin AVR/CPLD robot controller board. Also provides embedded-systems design and autonomous systems design consulting services.
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| O&M_Systems Software for the UK financial services industry including Pensions Profiler (best advice system) and Transvas Profiler (final salary transfer analysis).
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VSTa VSTa workI've hacked up some code to talk to a PCI BIOS,which is basically some code hacked from an oldish version of Linux. Theaim was to get an NCR53c810 SCSI driver going, but I got stalledon the PCI problem.On my old machine it worked well, but since then I've upgraded to aPentium, and it stopped working.The PCI standard includes a new type of BIOS for PC-type machines: BIOS32.It's designed to be a BIOS which is usable by real 32 bit kernels to determinePCI state without having to directly drive the hardware. A good ideain theory, but unfortunately it isn't designed as well as it could be.I used the standard algorithm to scan for a BIOS32 service directoryand map in the code found there. I can call it and get useful information.The assumption is that the BIOS will be called from an environmentwhere the code is allowed to do anything, which is typical in a conventionalkernel. VSTa, however, doesn't have conventional device drivers in a kernel.Instead, device drivers are implemented in normal user processes whichare given special permission to access the necessary hardware.I can do that in a VSTa process, so long as I know what informationneeds to be made availale. Unfortunately, there's no interface to findout which memory areas the BIOS will want to use, so I can't map themin. In addtion, the code is not relocatable, so I have to map it intothe same virtual address in the process as its physical address. This isOK so long as there's nothing else there, and its within the user addressspace limit (lower 2 or 3 gig?).NOTE: there's some kernel patches to change the interfaceof mmap(). The original version has an inconsistency: when using MAP_PHYS tomap a physical address into the address space, it uses the addrargument as the physical address, and inhibits the use of MAP_FIXEDat the same time. It is more consistent to allow MAP_FIXED anduse offset for the physical address and addr as the virtualaddress. The patch in mmap.dif does this, and there's a correspondingpatch to /vsta/src/srv/mach/cons2/cons.c to make it use the newmmap.All code and commentry applies to VSTa 1.4. I have not hada chance to test out newer versions. Andy said he would add my mmap() fixto newer kernels, but I haven't checked if this is the case. |
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Jeremy's | code | hack | to | talk | to | PCI | BIOS. |
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http://www.zip.com.au/~jeremy/VSTa.html
VSTa work 2008 October
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