I can't think of a good way.... https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Library/BaseIoLibIntrinsic/ will ASSERT on misaligned access.
So you can turn off all ASSERT() and DEBUG() macros when you build your module, or you could build versions of the library functions that support unaligned access. Andrew Fish On Nov 8, 2012, at 12:53 PM, Gerd Hoffmann wrote: > Hi, > > Is there some way to do _unaligned_ I/O? > > Background: > > I'm trying to extend the ovmf video driver, so it isn't limited to the > cirrus gfx card but can handle the other vga cards emulated by qemu/kvm > too. The easiest way to get this going is to use the bochs display > interface directly for modesetting. > > The problem with that approach is that the data register for the bochs > dispi interface is a 16bit register at a uneven address (0x01CF to be > exact). There seems to be no easy way to do that ... > > And, no, splitting that into two 8-byte accesses doesn't cut it, it must > be an outw instruction. > > Hints anyone? > > thanks, > Gerd > > PS: wip patch attached for reference > <0001-wip-QemuVideo-add-qemu-standard-vga-support.patch>------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_nov_______________________________________________ > edk2-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/edk2-devel ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_nov _______________________________________________ edk2-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/edk2-devel
