1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __VIRT_CONVERT__ 3 #define __VIRT_CONVERT__ 4 5 /* 6 * Macros used for converting between virtual and physical mappings. 7 */ 8 9 #ifdef __KERNEL__ 10 11 #include <linux/compiler.h> 12 #include <linux/mmzone.h> 13 #include <asm/setup.h> 14 #include <asm/page.h> 15 16 /* 17 * Change virtual addresses to physical addresses and vv. 18 */ 19 #define virt_to_phys virt_to_phys 20 static inline unsigned long virt_to_phys(void *address) 21 { 22 return __pa(address); 23 } 24 25 #define phys_to_virt phys_to_virt 26 static inline void *phys_to_virt(unsigned long address) 27 { 28 return __va(address); 29 } 30 31 /* Permanent address of a page. */ 32 #if defined(CONFIG_MMU) && defined(CONFIG_SINGLE_MEMORY_CHUNK) 33 #define page_to_phys(page) \ 34 __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT)) 35 #else 36 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 37 #endif 38 39 /* 40 * IO bus memory addresses are 1:1 with the physical address, 41 */ 42 #define virt_to_bus virt_to_phys 43 #define bus_to_virt phys_to_virt 44 45 #endif 46 #endif 47