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 static inline unsigned long virt_to_phys(void *address) 20 { 21 return __pa(address); 22 } 23 24 static inline void *phys_to_virt(unsigned long address) 25 { 26 return __va(address); 27 } 28 29 /* Permanent address of a page. */ 30 #if defined(CONFIG_MMU) && defined(CONFIG_SINGLE_MEMORY_CHUNK) 31 #define page_to_phys(page) \ 32 __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT)) 33 #else 34 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 35 #endif 36 37 /* 38 * IO bus memory addresses are 1:1 with the physical address, 39 */ 40 #define virt_to_bus virt_to_phys 41 #define bus_to_virt phys_to_virt 42 43 #endif 44 #endif 45