On Wed, May 18, 2016 at 05:12:36PM +0100, Matt Redfearn wrote:
> 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@xxxxxxxxxx>
> ---
>
> Changes in v2:
> - Skip check for config3 existing - we know it must to be doing
> multithreading
> - Use a unique lable name in the function
>
> arch/mips/kernel/cps-vec.S | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S
> index ac81edd44563..f8eae9189e38 100644
> --- a/arch/mips/kernel/cps-vec.S
> +++ b/arch/mips/kernel/cps-vec.S
> @@ -431,6 +431,21 @@ 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
Tiny nit - I'd prefer "andi" here since we're using an immediate. The
assembler will figure it out though, so it's not a big deal.
For both in the series:
Reviewed-by: Paul Burton <paul.burton@xxxxxxxxxx>
Thanks,
Paul
> + 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
> --
> 2.5.0
>
