#ifndef __VIRT_CONVERT__ #define __VIRT_CONVERT__ /* * Macros used for converting between virtual and physical mappings. */ #ifdef __KERNEL__ #include <linux/compiler.h> #include <linux/mmzone.h> #include <asm/setup.h> #include <asm/page.h> /* * Change virtual addresses to physical addresses and vv. */ static inline unsigned long virt_to_phys(void *address) { return __pa(address); } static inline void *phys_to_virt(unsigned long address) { return __va(address); } /* Permanent address of a page. */ #ifdef CONFIG_SINGLE_MEMORY_CHUNK #define page_to_phys(page) \ __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT)) #else #define page_to_phys(_page) ({ \ struct page *__page = _page; \ struct pglist_data *pgdat; \ pgdat = pg_data_table[page_to_nid(__page)]; \ page_to_pfn(__page) << PAGE_SHIFT; \ }) #endif /* * IO bus memory addresses are 1:1 with the physical address, * except on the PCI bus of the Hades. */ #ifdef CONFIG_HADES #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0)) #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0))) #else #define virt_to_bus virt_to_phys #define bus_to_virt phys_to_virt #endif #endif #endif