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powerpc/6xx: Store PGDIR physical address in a SPRG

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Use SPRN_SPRG2 to store the current thread PGDIR and
avoid reading thread_struct.pgdir at every TLB miss.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-02-21 10:37:55 +00:00
committed by Michael Ellerman
parent 0df977eafc
commit 93c4a162b0
4 changed files with 18 additions and 15 deletions
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4
arch/powerpc/kernel/cpu_setup_6xx.S
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@@ -24,6 +24,10 @@ BEGIN_MMU_FTR_SECTION
li r10,0
mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */
END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
lis r10, (swapper_pg_dir - PAGE_OFFSET)@h
ori r10, r10, (swapper_pg_dir - PAGE_OFFSET)@l
mtspr SPRN_SPRG_PGDIR, r10
BEGIN_FTR_SECTION
bl __init_fpu_registers
END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE)