<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - nouveau fails to run with NV5 [Riva TNT2 / TNT2 Pro]" href="https://bugs.freedesktop.org/show_bug.cgi?id=91025#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - nouveau fails to run with NV5 [Riva TNT2 / TNT2 Pro]" href="https://bugs.freedesktop.org/show_bug.cgi?id=91025">bug 91025</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>OK, looks like they're real opcodes, and not identical to other ones (at least not obviously so): udcli -16 -s 2032 vbios.rom The relevant code is: 000000000000015c 3c5a cmp al, 0x5a 000000000000015e 745b jz 0x1bb 000000000000016a 3c59 cmp al, 0x59 000000000000016c 0f84a700 jz word 0x217 00000000000001bb 53 push bx 00000000000001bc 662e8b37 mov esi, [cs:bx] 00000000000001c0 2e8b5f04 mov bx, [cs:bx+0x4] 00000000000001c4 662e8b07 mov eax, [cs:bx] 00000000000001c8 0bff or di, di 00000000000001ca 7503 jnz 0x1cf 00000000000001cc e8113e call 0x3fe0 00000000000001cf 5b pop bx 00000000000001d0 83c306 add bx, 0x6 00000000000001d3 e978ff jmp 0x14e 0000000000000217 662e8b37 mov esi, [cs:bx] 000000000000021b 83c304 add bx, 0x4 000000000000021e 53 push bx 000000000000021f 2e8b1f mov bx, [cs:bx] 0000000000000222 2e8b07 mov ax, [cs:bx] 0000000000000225 bb6400 mov bx, 0x64 0000000000000228 f7e3 mul bx 000000000000022a 5b pop bx 000000000000022b 0bff or di, di 000000000000022d 7513 jnz 0x242 000000000000022f 53 push bx 0000000000000230 e80842 call 0x443b 0000000000000233 5b pop bx 0000000000000234 32f6 xor dh, dh 0000000000000236 66c1e210 shl edx, 0x10 000000000000023a 8bd0 mov dx, ax 000000000000023c 668bc2 mov eax, edx 000000000000023f e89e3d call 0x3fe0 0000000000000242 83c302 add bx, 0x2 Where 0x3fe0 is a write of eax to mmio reg esi. Not sure what the function at 0x443b does. Nothing simple though... something PLL-related, I think. So looks like 0x5a is R[0..3] = VBIOS[4..5]. And 0x59 is... R[0..3] = who knows.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>