Searched hist:"043 cb41a85de1c0e944da61ad7a264960e22c865" (Results 1 – 2 of 2) sorted by relevance
| /linux/arch/riscv/include/asm/ |
| H A D | fixmap.h | diff 043cb41a85de1c0e944da61ad7a264960e22c865 Mon Mar 09 17:55:43 CET 2020 Zong Li <zong.li@sifive.com> riscv: introduce interfaces to patch kernel code
On strict kernel memory permission, we couldn't patch code without
writable permission. Preserve two holes in fixmap area, so we can map
the kernel code temporarily to fixmap area, then patch the instructions.
We need two pages here because we support the compressed instruction, so
the instruction might be align to 2 bytes. When patching the 32-bit
length instruction which is 2 bytes alignment, it will across two pages.
Introduce two interfaces to patch kernel code:
riscv_patch_text_nosync:
- patch code without synchronization, it's caller's responsibility to
synchronize all CPUs if needed.
riscv_patch_text:
- patch code and always synchronize with stop_machine()
Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
|
| /linux/arch/riscv/kernel/ |
| H A D | Makefile | diff 043cb41a85de1c0e944da61ad7a264960e22c865 Mon Mar 09 17:55:43 CET 2020 Zong Li <zong.li@sifive.com> riscv: introduce interfaces to patch kernel code
On strict kernel memory permission, we couldn't patch code without
writable permission. Preserve two holes in fixmap area, so we can map
the kernel code temporarily to fixmap area, then patch the instructions.
We need two pages here because we support the compressed instruction, so
the instruction might be align to 2 bytes. When patching the 32-bit
length instruction which is 2 bytes alignment, it will across two pages.
Introduce two interfaces to patch kernel code:
riscv_patch_text_nosync:
- patch code without synchronization, it's caller's responsibility to
synchronize all CPUs if needed.
riscv_patch_text:
- patch code and always synchronize with stop_machine()
Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
|