CVS commit: src/sys/arch

["Emmanuel Dreyfus" <manu%netbsd.org@localhost>]

Module Name:    src
Committed By:   manu
Date:           Thu Apr 20 00:42:24 UTC 2023

Modified Files:
        src/sys/arch/amd64/amd64: locore.S
        src/sys/arch/i386/stand/efiboot: boot.c efiboot.c efiboot.h
        src/sys/arch/i386/stand/efiboot/bootia32: efibootia32.c startprog32.S
        src/sys/arch/i386/stand/efiboot/bootx64: efibootx64.c startprog64.S
        src/sys/arch/i386/stand/lib: exec.c

Log Message:
Add reloc keyworkd to let EFI bootstrap load amd64 kernel at any address

EFI bootstrap assumes it can copy the amd64 kernel to its ELF load
address (that is KERNTEXTOFF - KERNBASE = 0x200000), but it can
clash with previous UEFI memory allocation, as described here:
http://mail-index.netbsd.org/tech-kern/2023/04/07/msg028833.html

This change adds a reloc keyword for controling where the EFI
boostrap will copy the kernel image. Possible values are:
default - the default and prior behavior, copy at 0x200000.
none - do not copy and use the kernel image where it was loaded.
address - specify an explicit address where to copy the kernel.

This comes with an amd64 kernel patch that makes it self-relocatable.
It first discover where it was loaded in memory, and if this is
different than the expected 0x200000, hhe the kernel relocates
itself and start over at the right address.


To generate a diff of this commit:
cvs rdiff -u -r1.218 -r1.219 src/sys/arch/amd64/amd64/locore.S
cvs rdiff -u -r1.21 -r1.22 src/sys/arch/i386/stand/efiboot/boot.c
cvs rdiff -u -r1.12 -r1.13 src/sys/arch/i386/stand/efiboot/efiboot.c
cvs rdiff -u -r1.11 -r1.12 src/sys/arch/i386/stand/efiboot/efiboot.h
cvs rdiff -u -r1.5 -r1.6 \
    src/sys/arch/i386/stand/efiboot/bootia32/efibootia32.c
cvs rdiff -u -r1.2 -r1.3 \
    src/sys/arch/i386/stand/efiboot/bootia32/startprog32.S
cvs rdiff -u -r1.5 -r1.6 src/sys/arch/i386/stand/efiboot/bootx64/efibootx64.c
cvs rdiff -u -r1.3 -r1.4 \
    src/sys/arch/i386/stand/efiboot/bootx64/startprog64.S
cvs rdiff -u -r1.78 -r1.79 src/sys/arch/i386/stand/lib/exec.c

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