Is it mandatory to report Reserved Memory region to the OS? For example, the IOAPICs memory-mapped addresses? Would that be a problem if Linux kernel didn't see it be claimed as RESERVED?
It seems Linuxbios doesn't claim any memory regions as RESERVED.
gin
"Gin" ginlin@nexcom.com.tw writes:
Is it mandatory to report Reserved Memory region to the OS? For example, the IOAPICs memory-mapped addresses?
Reserving the address of any IO devices is a BUG BUG BUG. Your kernel will not boot if it doing things properly.
Would that be a problem if Linux kernel didn't see it be claimed as RESERVED?
More likely the reverse.
It seems Linuxbios doesn't claim any memory regions as RESERVED.
We reserve out tables.
Reserving memory is to tell the OS to never ever touch it (at least that is the linux interpretation). So if there is some magic hardware that the OS never sees we may want to reserve that. But mostly it is about reserving memory that is used for another purpose. And we just have a couple of tables which are pretty small.
We really should communicate the address of non probable devices but that work is in process.
Eric
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ebiederman＠lnxi.com -
Gin