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Groups > linux.kernel > #1403132
| From | Matt Redfearn <matt.redfearn@imgtec.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v2 2/2] MIPS: CPS: Copy EVA configuration when starting secondary VPs. |
| Date | 2016-05-18 18:20 +0200 |
| Message-ID | <rAcmu-4oQ-21@gated-at.bofh.it> (permalink) |
| References | <rAcmu-4oQ-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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> --- 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 + 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
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[PATCH v2 2/2] MIPS: CPS: Copy EVA configuration when starting secondary VPs. Matt Redfearn <matt.redfearn@imgtec.com> - 2016-05-18 18:20 +0200
Re: [PATCH v2 2/2] MIPS: CPS: Copy EVA configuration when starting secondary VPs. Paul Burton <paul.burton@imgtec.com> - 2016-05-19 00:40 +0200
Re: [PATCH v2 2/2] MIPS: CPS: Copy EVA configuration when starting secondary VPs. Matt Redfearn <matt.redfearn@imgtec.com> - 2016-05-19 09:10 +0200
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