[coreboot] SMM on K8

Marc Jones marcj303 at gmail.com
Fri Nov 19 17:41:01 CET 2010


2010/11/17 Rudolf Marek <r.marek at assembler.cz>:
> Hi all,
>
> Here is a SMM patch that actually works on VT8237S! It supports only SMI CMD
> so sending something to port 0x52f should trigger it.
>
> It is mostly in good state however following needs to be done. Thats left to
> Tobias or Fengwei.
>
> 0) only enabled board is m2v-mx se (trivial to enable others VIA 8237 based)
> 1) PCIe access is hardcoded to 0xe000000
>
> This sucks,but generally mmconfig is good idea beacuse it does not create
> races...
>
> So what about that?
>
> a) change the SMM handler to save PCIcfg/PCIdata??? regs
> b) make MMCONFIG static to 0xe00000
> c) some clever way to get idea where it is without PCI access
>
>
> 2) Dualcore/more cpus
>
> I hardcoded that for single CPU. You need most likely change
> model_fxx_init.c and call smm_init from there (except that copy can done via
> CPU)
>
> All CPUs needs to set Aseg ENable and SMM_BASE (to different address)
>
> No smm_relocate.S is used because we dont need it on AMD, we have the
> MSRs...
>
> 3) More features to SMM
>
> Handy would be ACPI enable/disable -maybe whats there will work
> and Poweroff if powerbutton is pressed and acpi does not work yet ;)
>
> Otherwise SMM is not used at all so we don't really need any features...
>
> 4) Cool stuff
>
> Emulate some hardware one can do traps for IO and for MMIO so any HW can be
> created just for fun (TPM ;)
>
> 5) remove HACK_SMM
> The header file dislikes the include someone needs to fix that.
>
> 6) SMM locking
>
> The SMM should be locked, there is even a register for that. However I dont
> know if all CPUs needs to lock... and if some cpu is locked, can others
> still access the memory (for the memcopy?)
>
> Also we lock SMM on the base in the RAM, we should create a dummy "RSM" like
> handler if we don't have any SMI handler on K8.
>
> Thanks goes to Stepan for initial version (from mine POC version).
>

I haven't looked at the patch, but this is exciting development. Open
SMM implementation should interest many people.

Marc

-- 
http://se-eng.com




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