2009/6/26 jean-francois simon <jfs@xxxxxxxxxx>: > i have tried it and it fails with: > > Page fault: write instruction to linear address: 0xdffff3fc > CPU was in user mode > Exception was caused by non-available page > VFLAGS(b): 010000001010000110 > EAX: 01000000 EBX: 00cc8600 ECX: 00cc8600 EDX: 00000615 VFLAGS(h): > 00010286 > ESI: 00000212 EDI: dffff3fc EBP: 00000000 > CS: 0033 DS: 0000 ES: 0000 FS: 0000 GS: 0000 > > the address is valid since it is that which is reported by lspci. but it > seems like a permission issue (CPU was in user mode). i did a "dosemu > -s" though. The DOS DPMI program cannot access the memory directly (on i386 Linux kernels it would actually be a kernel address) but would need to create a mapping using the DPMI function for physical address mapping (int31/AX=0x0800). If you run "dosemu -s -D+M" you should see what the DPMI program does in ~/.dosemu/boot.log and also where DOSEMU actually maps that memory. hope that helps, Bart -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
