sorry, i am beginning to learn something new. never knew there is such a system call vm86(). (man vm86 to read more), and the implementation is in linux kernel's vm86.c, which runs 16bit under 32bit protected mode task. and from the man pages of vm86, dosemu is using this API. So I think your answer could be found from source codes of DOSEMU at sourceforge. On Tue, Sep 2, 2008 at 11:15 AM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > technically, 16bit cannot access > 16bit of RAM for i368 CPU. so the > answer is technically impossible, CMIW. > > and linux kernel only runs on 32bit and 64bit, but u want to execute > 16bit insn? eg, using QEMU to run 16 bit application? So i think > your questions sounds like: how to execute insn (16bit) and do > graphic rendering? if everything is done in the realm of emulated > 16bit, i think that is possible. but then u are running everything > independent of Linux Kernel (only 32/64 bit) as well......wow....i am > really puzzled...:-(. > > essentially....u are writing your OS.....16bit version. > > how about checking out the source codes of FreeDOS at sourceforge, > which run 16bit OS, and should have some codes for rendering the > screen graphics? > > > On Mon, Sep 1, 2008 at 5:56 PM, ZelluX <zellux@xxxxxxxxx> wrote: >> Hi, all >> >> I want to enter v86 mode and switch to VGA Mode 13h to draw some pictures. >> Now i can enter v86 mode with IRET instruction setting VM flag in the eflags >> register. >> >> But since v86 mode supports only 16-bit address, how can i let the cpu >> executes instructions beyond 0x100000 which includes setting VGA Mode 13h >> and drawing pictures? >> >> Many thanks for your reply ;-) >> > > > > -- > Regards, > Peter Teoh > -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
