What is CONFIG_RTAS ? Which CPUs are concerned
Christophe Leroy
christophe.leroy at c-s.fr
Tue Jan 29 05:20:43 AEDT 2019
Hello All,
I'm wondering what CONFIG_RTAS is. It makes use of one of the SPRN_SPRG,
ie SPRN_SPRG2.
What are the CPUs concerned by RTAS ? Is there any of the old CPUs which
have only 4 SPRGs (eg the 601), or could we use one in SPRG4-7 for it
and reuse SPRG2 for something else ?
The idea behind this question is to store physical address of PGDIR in
SPRG2 and then put virtual address of thread_struct instead of its
physical address in SPRG3, especially for when CONFIG_VMAP_STACK is set.
Thanks
Christophe
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