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authorAlexandre Ghiti2021-12-06 11:46:51 +0100
committerPalmer Dabbelt2022-01-19 17:54:09 -0800
commite8a62cc26ddf53a3c6ba2a8d33036cf7b84f3923 (patch)
tree15b9020880a651c756268a4560b8c6c720fc1031 /fs/efs/Makefile
parent60639f74c2f4fcc3ffa2ac0b120eaa874ccc713f (diff)
riscv: Implement sv48 support
By adding a new 4th level of page table, give the possibility to 64bit kernel to address 2^48 bytes of virtual address: in practice, that offers 128TB of virtual address space to userspace and allows up to 64TB of physical memory. If the underlying hardware does not support sv48, we will automatically fallback to a standard 3-level page table by folding the new PUD level into PGDIR level. In order to detect HW capabilities at runtime, we use SATP feature that ignores writes with an unsupported mode. Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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