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From: | RayeR <glaux AT centrum DOT cz> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: PM interrupt handling - how to call old old ISR with slower rate than my new ISR |
Date: | Fri, 02 Nov 2007 03:02:30 -0700 |
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> the other DPMI functions... "call real mode procedure with IRET frame" > > For best performance, also hook the real-mode timer interrupt, else > there'll be lots of mode switching. Where can I find the call_real_mode_procedure_with_iret_frame DPMI wrapper? Can I call old ISR by _go32_dpmi_simulate_int or similar? But if I will call RM interrupt I will need to save it's vector as RM int vector using _go32_dpmi_get_realmode_interrupt_vector instead of _go32_dpmi_get_protected_mode_interrupt_vector, right? Does DJGPP hooks something to timer interrupt in PM or pass it to old RM ISR? If I would use hooking RM interrupt I will need to write the ISR completly in assembler and then do some magic with transfer buffer to setup it. I'd rather use PM ISR written in C if possible. BTW if I use _go32_dpmi_set_protected_mode_interrupt_vector and dont't call old ISR at all the system will hang.
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