CVS commit: src/sys/arch

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat Sep 24 11:05:18 UTC 2022

Modified Files:
        src/sys/arch/amd64/conf: ALL GENERIC
        src/sys/arch/i386/conf: ALL GENERIC
        src/sys/arch/x86/conf: files.x86
        src/sys/arch/x86/include: pmap_private.h
        src/sys/arch/x86/x86: cpu.c efi_machdep.c pmap.c svs.c
Added Files:
        src/sys/arch/amd64/include: efi.h
        src/sys/arch/i386/include: efi.h

Log Message:
x86: Support EFI runtime services.

This creates a special pmap, efi_runtime_pmap, which avoids setting
PTE_U but allows mappings to lie in what would normally be user VM --
this way we don't fall afoul of SMAP/SMEP when executing EFI runtime
services from CPL 0.  SVS does not apply to the EFI runtime pmap.

The mechanism is intended to work with either physical addressing or
virtual addressing; currently the bootloader does physical addressing
but in principle it could be modified to do virtual addressing
instead, if it allocated virtual pages, assigned them in the memory
map, and issued RT->SetVirtualAddressMap.

Not sure pmap_activate_sync and pmap_deactivate_sync are correct,
need more review from an x86 wizard.

If this causes fallout, it can be disabled temporarily without
reverting anything by just making efi_runtime_init return immediately
without doing anything, or by removing options EFI_RUNTIME.

amd64-only for now pending type fixes and testing on i386.


To generate a diff of this commit:
cvs rdiff -u -r1.173 -r1.174 src/sys/arch/amd64/conf/ALL
cvs rdiff -u -r1.597 -r1.598 src/sys/arch/amd64/conf/GENERIC
cvs rdiff -u -r0 -r1.1 src/sys/arch/amd64/include/efi.h
cvs rdiff -u -r1.502 -r1.503 src/sys/arch/i386/conf/ALL
cvs rdiff -u -r1.1240 -r1.1241 src/sys/arch/i386/conf/GENERIC
cvs rdiff -u -r0 -r1.1 src/sys/arch/i386/include/efi.h
cvs rdiff -u -r1.123 -r1.124 src/sys/arch/x86/conf/files.x86
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/x86/include/pmap_private.h
cvs rdiff -u -r1.205 -r1.206 src/sys/arch/x86/x86/cpu.c
cvs rdiff -u -r1.1 -r1.2 src/sys/arch/x86/x86/efi_machdep.c
cvs rdiff -u -r1.421 -r1.422 src/sys/arch/x86/x86/pmap.c
cvs rdiff -u -r1.41 -r1.42 src/sys/arch/x86/x86/svs.c

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