CVS commit: src/sys/arch/x86/x86

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Tue Jun 19 09:25:13 UTC 2018

Modified Files:
        src/sys/arch/x86/x86: fpu.c

Log Message:
When using EagerFPU, create the fpu state in execve at IPL_HIGH.

A preemption could occur in the middle, and we don't want that to happen,
because the context switch would use the partially-constructed fpu state.

The procedure becomes:

        splhigh
        unbusy the current cpu's fpu
        create a new fpu state in memory
        install the state on the current cpu's fpu
        splx

Disabling preemption also ensures that x86_fpu_eager doesn't change in
the middle.

In LazyFPU mode we drop IPL_HIGH right away.

Add more KASSERTs.


To generate a diff of this commit:
cvs rdiff -u -r1.38 -r1.39 src/sys/arch/x86/x86/fpu.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.