Re: Inclusion of x86_64 memorize ioapic at bootup patch

Eric W. Biederman
2006-01-07T19:45:31Z

yhlu <yhlu.kernel@gmail.com> writes:

> MPTABLE in LinuxBIOS is put from 0x20, if the system has too many cpu
> and devices (slots) the mptable will get bigger than 0x464, so it
> will use 0x40:67....

Then you or someone moved it. The base in low memory was originally
at 0x500, to avoid just these kinds of problems.

> We need to put mptable to [0xf0000:0x100000] together with acpi
> tables.

Or move it up a few bytes.

> and if it is bigger than 64k, then we have to put it on special
> postion ...from 1K, and pass the posstion of mptable to the kernel via
> command line.
>
> I will update the code in LinuxBIOS.

Thanks. It is always a good idea not to assign legacy regions of the
address space new meanings.

Eric