[SeaBIOS] SeaBIOS CSM status

[David Woodhouse]

Just a brief update for those who are interested... the CSM is fairly
functional now. I've tested with:

 Various Linuxes including CentOS [56], Fedora 17.
 Windows 7
 Windows 2008r2 (via EFI)
 OpenBSD 5.2
 FreeBSD 9
 FreeBSD 8
 Debian/kFreeBSD (also FBSD 8 kernel I think)
 DragonflyBSD
 NetBSD
 Solaris 10
 Solaris 11
 OpenIndiana
 FreeDOS

I think everything is working except a few problems with the ACPI tables
that OVMF produces. OpenBSD crashes in its AML interpreter unless I
revert OVMF commit r14403.

FreeBSD 9 crashes when assigning PCI interrupts:

pcib0: allocated type 3 (0x82000000-0x8201ffff) for rid 10 of pci0:0:3:0
        map[14]: type I/O Port, range 32, base 0xc000, size  6, enabled
pcib0: allocated type 4 (0xc000-0xc03f) for rid 14 of pci0:0:3:0
pcib0: matched entry for 0.3.INTA (src \_SB_.PCI0.LPC_.LNKC:0)

... and then it just sits there. If I boot with a normal SeaBIOS, it
looks like this:

pcib0: allocated type 3 (0xfeba0000-0xfebbffff) for rid 10 of pci0:0:3:0
        map[14]: type I/O Port, range 32, base 0xc000, size  6, enabled
pcib0: allocated type 4 (0xc000-0xc03f) for rid 14 of pci0:0:3:0
pcib0: matched entry for 0.3.INTA (src \_SB_.LNKC:0)
pcib0: slot 3 INTA routed to irq 11 via \_SB_.LNKC
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0

... and continues happily.

FreeBSD 8 (and Debian/kFreeBSD) seem to work but keep complaining of a
storm of IRQ9, which is the ACPI interrupt.

At this point, I'm fairly much prepared to declare that all of those are
Not My Fault™ and that the CSM is basically working.

I'm probably going to look at NV variable storage for OVMF next, using
qemu's fw_cfg (which *is* writeable) directly instead of the evil thing
it does now with storing a file on the EFI partition. And also fix up
the device detection on the OVMF side, and fix the fact that OVMF won't
even *ask* the CSM to boot from a virtio or SCSI disk if they exist.
 
-- 
dwmw2

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