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
virt_to_phys(void * address)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
phys_to_virt(unsigned long address)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