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authorMatt Redfearn <matt.redfearn@imgtec.com>2016-05-18 19:12:36 +0300
committerRalf Baechle <ralf@linux-mips.org>2016-05-28 13:35:05 +0300
commit63a8802f4fb60963d3f91b072f4d0424330ec0d4 (patch)
tree5003df7cbee637eed4e4f2302ffe97c917967bc2 /arch
parent5c33f8b2e54c519c42a30cfb34d9ecb70631bf83 (diff)
downloadlinux-63a8802f4fb60963d3f91b072f4d0424330ec0d4.tar.xz
MIPS: CPS: Copy EVA configuration when starting secondary VPs.
When starting secondary VPEs which support EVA and the SegCtl registers, copy the memory segmentation configuration from the running VPE to ensure that all VPEs in the core have a consistent virtual memory map. The EVA configuration of secondary cores is dealt with when starting the core via the CM. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/13291/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/kernel/cps-vec.S15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
index 51b98dc371b3..59476a607add 100644
--- a/arch/mips/kernel/cps-vec.S
+++ b/arch/mips/kernel/cps-vec.S
@@ -441,6 +441,21 @@ LEAF(mips_cps_boot_vpes)
mfc0 t0, CP0_CONFIG
mttc0 t0, CP0_CONFIG
+ /*
+ * Copy the EVA config from this VPE if the CPU supports it.
+ * CONFIG3 must exist to be running MT startup - just read it.
+ */
+ mfc0 t0, CP0_CONFIG, 3
+ and t0, t0, MIPS_CONF3_SC
+ beqz t0, 3f
+ nop
+ mfc0 t0, CP0_SEGCTL0
+ mttc0 t0, CP0_SEGCTL0
+ mfc0 t0, CP0_SEGCTL1
+ mttc0 t0, CP0_SEGCTL1
+ mfc0 t0, CP0_SEGCTL2
+ mttc0 t0, CP0_SEGCTL2
+3:
/* Ensure no software interrupts are pending */
mttc0 zero, CP0_CAUSE
mttc0 zero, CP0_STATUS