On Thu, 04 Dec 2003 20:35:02 -0500, Sergey Babkin wrote: > >I've been running XFree86 4.3.0.1 on a machine with a particularly >weird videocard and I've got the VESA driver craching. >... >A little investigation has shown that it crashes in >x86emuOp_mov_word_SR_RM() >... >This happens because destreg is 0, because it's returned that way >from decode_rm_seg_register(). rh is 4, and that's the value that >decode_rm_seg_register() in decode.c (also linked from extras) does >not understand. I've looked it up in the manual and actually >the value 4 is for FS and value 5 is for GS.
So, the conclusion here is that the Intel 815 BIOS uses FS and GS? That is both surprising and disturbing. The BIOS runs in real/v86 mode, and is not generally allowed to make any assumptions about the addressing in the machine. XFree86 doesn't map in any low-memory sections other than the segments at 00000, A0000, B0000, and C0000. Given that, it is hard to imagine a scenario where DS and ES are not completely sufficient to do the job. Do you know what call is being made at the time of the crash? -- - Tim Roberts, [EMAIL PROTECTED] Providenza & Boekelheide, Inc. _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
