CVS commit: src/sys/arch

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

Module Name:    src
Committed By:   maxv
Date:           Sun Jul 24 14:09:22 UTC 2016

Modified Files:
        src/sys/arch/i386/acpi: acpi_wakecode.S acpi_wakeup_low.S
        src/sys/arch/x86/acpi: acpi_wakeup.c

Log Message:
The MSR EFER state is not saved and restored when sleeping on i386. On PAE,
the CPU crashes right after waking up, since it needs to access NOX-ed
pages, which are to be enabled in an MSR.

Fix this by properly saving and restoring the EFER MSR. It's a little
tricky since the wakeup code uses %edx, but rdmsr overwrites it. We just
save it in %esi.

Now, the CPU sleeps properly on PAE kernels.


To generate a diff of this commit:
cvs rdiff -u -r1.17 -r1.18 src/sys/arch/i386/acpi/acpi_wakecode.S
cvs rdiff -u -r1.6 -r1.7 src/sys/arch/i386/acpi/acpi_wakeup_low.S
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/x86/acpi/acpi_wakeup.c

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