03a79520d6
Enable long mode in SMM handler.
x86_32 isn't affected by this change.
As the rsm instruction used to leave SMM doesn't restore MSR registers,
drop back to protected mode after running the smi_handler and restore
IA32_EFER MSR (which enables long mode support) to previous value.
NOTE: This commit does NOT introduce a new security model. It uses the
same page tables as the remaining firmware does.
This can be a security risk if someone is able to manipulate the
page tables stored in ROM at runtime. USE FOR TESTING ONLY!
Tested on Qemu Q35.
Change-Id: I8bba4af4688c723fc079ae905dac95f57ea956f8
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35681
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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| .. | ||
| Intel | ||
| RFC | ||
| _static | ||
| acpi | ||
| arch | ||
| community | ||
| contributing | ||
| doxygen | ||
| drivers | ||
| flash_tutorial | ||
| getting_started | ||
| gfx | ||
| ifdtool | ||
| lib | ||
| mainboard | ||
| northbridge | ||
| releases | ||
| security | ||
| soc | ||
| superio | ||
| technotes | ||
| tutorial | ||
| vendorcode | ||
| AMD-S3.txt | ||
| COPYING | ||
| Doxyfile.coreboot | ||
| Doxyfile.coreboot_simple | ||
| Makefile | ||
| Makefile.sphinx | ||
| POSTCODES | ||
| beginverbatim.tex | ||
| cbfs.txt | ||
| codeflow.svg | ||
| coding_style.md | ||
| conf.py | ||
| corebootBuildingGuide.tex | ||
| coreboot_logo.png | ||
| distributions.md | ||
| endverbatim.tex | ||
| gcov.txt | ||
| hypertransport.svg | ||
| index.md | ||
| mainboard_io_trap_handler_sample.c | ||
| payloads.md | ||
| util.md | ||
