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.
