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According to LoongArch documentations, there are two types of address translation modes: direct mapped address translation mode (DMW mode) and page table mapped address translation mode (TLB mode). Currently, virt_to_page() only supports direct mapped mode. This patch determines which mode is used, and adds corresponding handling functions for both modes. For more details on the two modes, see [1]. [1] https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html#virtual-address-space-and-address-translation-mode Signed-off-by: Enze Li <lienze@kylinos.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>