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| author | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-11 15:52:12 +0300 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-08-12 08:10:11 +0300 |
| commit | ab2579d79529b8ed34f26a374a352f12ce24d5df (patch) | |
| tree | 479868eddc4b104801cf4c657daac305c9e5a0be /arch/loongarch/include/asm/irq.h | |
| parent | 5e8be07ca8f7f49d49c6d5d44f69caaa2fa4b660 (diff) | |
| download | linux-ab2579d79529b8ed34f26a374a352f12ce24d5df.tar.xz | |
LoongArch: Jump to the link address before enable PG
The kernel entry points of both boot CPU (i.e., kernel_entry) and non-
boot CPUs (i.e., smpboot_entry) may be physical address from BootLoader
(in DA mode or identity-mapping PG mode). So we should jump to the link
address before PG enabled (because DA is disabled at the same time) and
just after DMW configured.
Specifically: With some older firmwares, non-boot CPUs started with PG
enabled, but this need firmware cooperation in the form of a temporary
page table, which is deemed unnecessary. OTOH, latest firmware versions
configure the non-boot CPUs to start in DA mode, so kernel-side changes
are needed.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/asm/irq.h')
0 files changed, 0 insertions, 0 deletions