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Adjust memory management for both 32BIT and 64BIT, including: address space definition, DMW CSR definition, page table bits definition, boot time detection of VA/PA bits, page table init, tlb exception handling, copy_page/clear_page/dump_tlb libraries, etc. Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Yawei Li <liyawei@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>