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9e14e03032
Set a default MMIO region with a single SmePMP entry, which allows us to save entries for M-mode only devices. The default entry has M-/S-mode shared permission, so system-level resource protection, such as RISC-V World extension and WorldGuard checker, will be introduced to protect M-mode only region access from lower privilege modes. Reviewed-by: Greentime Hu <greentime.hu@sifive.com> Reviewed-by: Zong Li <zong.li@sifive.com> Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com> Link: https://lore.kernel.org/r/20260224031733.3817148-3-peter.lin@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>