OpenBSD / src / ymKbTq4 / Add an instruction synchronisation barrier instruction after changing

OpenBSD/src ymKbTq4 — sys/arch/arm64/arm64 vfp.c

2017-03-28 23:47:17 UTC by jsg on ⎇

HEAD

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OPENBSD_6_2_BASE
OPENBSD_6_1_BASE

   Add an instruction synchronisation barrier instruction after changing
   the vfp state via cpacr_el1.  This matches the advice given in the
   "Synchronization requirements for system registers" section of the ARMv8
   ARM.

   Without this an overdrive 1000 with A1120 (Cortex A57 r1p2) reliably
   triggers "panic: VFP exception in the kernel" when init(8) is run.

   ok drahn@ kettenis@

Version	Delta		File
1.2	+2	-1	sys/arch/arm64/arm64/vfp.c
	+2	-1	1 files

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