Re: please explain to me why video/bios shadowing must be disabledto use graphics... -- Victory!!!
Hi. Bart Oldeman wrote: Doing the reset call from within DOS brings everything back in a sane state. Just wondering, why this reset is needed so badly? Just a very rough guess: proper initialization of certain BIOS variables in the range 0x400-0x4ff (0040:-0040:00ff) ? Exactly! Plus some int vectors, which I can easily identify as they are pointing to a vbios seg. Now I am getting that vectors together with 0x40:00-ff from /dev/mem, skipping the INIT and opening the high ports and... - I have a full-screen VESA! There are still some minor problems to resolve, but I expect to get the new video startup code within a few weeks, just let me play full-screen GTA a little:) Oh, and there is still one very bad thing, which is that we can't open the high ports in a fast mode (or can we?), so sometimes it works even slower than xdos... why ioperm() doesn't allow 0x3ff ports?.. - To unsubscribe from this list: send the line unsubscribe linux-msdos in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: please explain to me why video/bios shadowing must be disabledto use graphics... -- Victory!!!
Hello. Bart Oldeman wrote: slower than xdos... why ioperm() doesn't allow 0x3ff ports?.. Once upon a time Linus decided that a 128 byte per-process i/o bitmap is ok, but 8192 bytes is excessively large. Yes, and there was a reason then, which was that ISA had 10-bit IO space most likely, but why it wasn't altered since, is still unclear. see also iopl(2) I don't think it can be used. Even if I trap int10, do iopl(3), then trap iret and do iopl(0), it is still dangerous, because pesky vbios calls some other ints in a mean time. iopl() is used in ports.c anyway to access that ports... I think there is no way around: VESA in WinXP have the same speed (which means that they also doesn't have an ability to manipulate the large IO bitmap? - strange). - To unsubscribe from this list: send the line unsubscribe linux-msdos in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
