Dear all: If I remember correctly, the translation between virtual and physical memory should use page table. But in include/asm/memory.h, these 2 functions seem don't use page table to do the translation. #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) where in mmu mode #define PHYS_OFFSET UL(0x00000000) #ifndef PAGE_OFFSET #define PAGE_OFFSET UL(0xc0000000) #endif not in mmu mode #ifndef PHYS_OFFSET #define PHYS_OFFSET (CONFIG_DRAM_BASE) #endif #ifndef PAGE_OFFSET #define PAGE_OFFSET (PHYS_OFFSET) #endif Why they don't need page table to do the page table translation? Except the caller is at the first page and in kernel, the first page is located at the first frame. thanks for your help, miloody -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
