Commit 63a8802f authored May 18, 2016 by Matt Redfearn Committed by Ralf Baechle May 28, 2016

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>

parent 5c33f8b2

arch/mips/kernel/cps-vec.S

+15 −0

Original line number	Diff line number	Diff line
		@@ -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

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