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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-02-21 13:37:55 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2019-02-21 16:10:16 +0300
commit93c4a162b014d238a287f8264adb25c009c79e61 (patch)
tree22a11a62f16f26c387315108f5b6ff2892f9e14f /arch/powerpc/kernel/cpu_setup_6xx.S
parent0df977eafc792a5365a7f81d8d5920132e03afad (diff)
downloadlinux-93c4a162b014d238a287f8264adb25c009c79e61.tar.xz
powerpc/6xx: Store PGDIR physical address in a SPRG
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>
Diffstat (limited to 'arch/powerpc/kernel/cpu_setup_6xx.S')
-rw-r--r--arch/powerpc/kernel/cpu_setup_6xx.S4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S
index 8c069e96c478..6f1c11e0691f 100644
--- a/arch/powerpc/kernel/cpu_setup_6xx.S
+++ b/arch/powerpc/kernel/cpu_setup_6xx.S
@@ -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)