LoongArch: Add kexec support

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Add three new files, kexec.h, machine_kexec.c and relocate_kernel.S to
the LoongArch architecture, so as to add support for the kexec re-boot
mechanism (CONFIG_KEXEC) on LoongArch platforms.

Kexec supports loading vmlinux.elf in ELF format and vmlinux.efi in PE
format.

I tested kexec on LoongArch machines (Loongson-3A5000) and it works as
expected:

 $ sudo kexec -l /boot/vmlinux.efi --reuse-cmdline
 $ sudo kexec -e

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

...

This commit is contained in:

Youling Tang 2022-10-12 16:36:19 +08:00 • committed by Huacai Chen

parent 2d2c395217

commit 4a03b2ac06

6 changed files with 400 additions and 1 deletions

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11

arch/loongarch/Kconfig

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60

arch/loongarch/include/asm/kexec.h

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2

arch/loongarch/kernel/Makefile

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6

arch/loongarch/kernel/head.S

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216

arch/loongarch/kernel/machine_kexec.c

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106

arch/loongarch/kernel/relocate_kernel.S

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