opensbi.git/platform/generic/sifive_fu540.c, branch master

platform: generic: Move Sifive platform overrides into own directory

2022-05-13T03:57:23Z

Let us move SiFive platform overrides for FU540 and FU740 into a separate directory so better maintainability. Other SoC vendors can also create their own directory under platform/generic. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

platform/lib: Allow the OS to map the regions that are protected by PMP

2020-06-15T03:55:44Z

This is achieved by removing the 'no-map' property from the 'reserved-memory' node when PMP is present, otherwise we keep it as it offers a small protection if the OS does not map this region at all. A new callback in platform_override is introduced and allows to fixup the device-tree. It is used here to override this new default behaviour on SiFive Fu540 platforms that has an erratum that prevents S-mode software to access a PMP protected region using 1GB page table mapping. If PMP is present, telling the OS not to map the reserved regions does not add much protection since it only avoids access to regions that are already protected by PMP. But by not allowing the OS to map those regions, it creates holes in the OS system memory map and prevents the use of hugepages which would generate, among other benefits, less TLB miss. Signed-off-by: Alexandre Ghiti Reviewed-by: Atish Patra Reviewed-by: Anup Patel

platform: generic: Add Sifive FU540 TLB flush range limit override

2020-05-01T05:03:14Z

We need to override the remote TLB flush range limit for SiFive FU540 so we add platform override to achieve this. Signed-off-by: Anup Patel Reviewed-by: Atish Patra