H. Peter Anvin wrote:
Furthermore, it is completely unnecessary. Instead of stuffing the old
pointer in an interupt vector and using the INT instruction, stuff it in
a variable in the local code segment, and use the following sequence:
pushf
lcallw *%cs:old_vector
In order to do this it needs, of course, to be able to write to its own
memory, which I'm not sure if qemu-kvm allows by default. If so, this
You mean, "if not"?
is actually a defect in qemu-kvm, since modern expansion "ROMs" *do*
expect to be able to write to their own memory areas during
initialization; see the PnPBIOS spec, Appendix B; support for this
specification is mandatory for PCI systems.
kvm allows writing into the bios; qemu does not. I thought it was a kvm
bug, but turns out that it's a qemu bug...
(though to be fair, true emulation ought to start out read-only, then be
enabled by the bios ram shadow mechanism)
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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