1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_MEMORY_MODEL_H
 3#define __ASM_MEMORY_MODEL_H
 4
 5#include <linux/pfn.h>
 6
 7#ifndef __ASSEMBLY__
 8
 
 
 
 9#if defined(CONFIG_FLATMEM)
10
11#ifndef ARCH_PFN_OFFSET
12#define ARCH_PFN_OFFSET		(0UL)
13#endif
14
15#elif defined(CONFIG_DISCONTIGMEM)
16
17#ifndef arch_pfn_to_nid
18#define arch_pfn_to_nid(pfn)	pfn_to_nid(pfn)
19#endif
20
21#ifndef arch_local_page_offset
22#define arch_local_page_offset(pfn, nid)	\
23	((pfn) - NODE_DATA(nid)->node_start_pfn)
24#endif
25
26#endif /* CONFIG_DISCONTIGMEM */
27
28/*
29 * supports 3 memory models.
30 */
31#if defined(CONFIG_FLATMEM)
32
33#define __pfn_to_page(pfn)	(mem_map + ((pfn) - ARCH_PFN_OFFSET))
34#define __page_to_pfn(page)	((unsigned long)((page) - mem_map) + \
35				 ARCH_PFN_OFFSET)
36#elif defined(CONFIG_DISCONTIGMEM)
37
38#define __pfn_to_page(pfn)			\
39({	unsigned long __pfn = (pfn);		\
40	unsigned long __nid = arch_pfn_to_nid(__pfn);  \
41	NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\
42})
43
44#define __page_to_pfn(pg)						\
45({	const struct page *__pg = (pg);					\
46	struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg));	\
47	(unsigned long)(__pg - __pgdat->node_mem_map) +			\
48	 __pgdat->node_start_pfn;					\
49})
50
51#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
52
53/* memmap is virtually contiguous.  */
54#define __pfn_to_page(pfn)	(vmemmap + (pfn))
55#define __page_to_pfn(page)	(unsigned long)((page) - vmemmap)
56
57#elif defined(CONFIG_SPARSEMEM)
58/*
59 * Note: section's mem_map is encoded to reflect its start_pfn.
60 * section[i].section_mem_map == mem_map's address - start_pfn;
61 */
62#define __page_to_pfn(pg)					\
63({	const struct page *__pg = (pg);				\
64	int __sec = page_to_section(__pg);			\
65	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
66})
67
68#define __pfn_to_page(pfn)				\
69({	unsigned long __pfn = (pfn);			\
70	struct mem_section *__sec = __pfn_to_section(__pfn);	\
71	__section_mem_map_addr(__sec) + __pfn;		\
72})
73#endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
74
75/*
76 * Convert a physical address to a Page Frame Number and back
77 */
78#define	__phys_to_pfn(paddr)	PHYS_PFN(paddr)
79#define	__pfn_to_phys(pfn)	PFN_PHYS(pfn)
80
81#define page_to_pfn __page_to_pfn
82#define pfn_to_page __pfn_to_page
83
84#endif /* __ASSEMBLY__ */
85
86#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_MEMORY_MODEL_H
 3#define __ASM_MEMORY_MODEL_H
 4
 5#include <linux/pfn.h>
 6
 7#ifndef __ASSEMBLY__
 8
 9/*
10 * supports 3 memory models.
11 */
12#if defined(CONFIG_FLATMEM)
13
14#ifndef ARCH_PFN_OFFSET
15#define ARCH_PFN_OFFSET		(0UL)
16#endif
17
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
18#define __pfn_to_page(pfn)	(mem_map + ((pfn) - ARCH_PFN_OFFSET))
19#define __page_to_pfn(page)	((unsigned long)((page) - mem_map) + \
20				 ARCH_PFN_OFFSET)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
21
22#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
23
24/* memmap is virtually contiguous.  */
25#define __pfn_to_page(pfn)	(vmemmap + (pfn))
26#define __page_to_pfn(page)	(unsigned long)((page) - vmemmap)
27
28#elif defined(CONFIG_SPARSEMEM)
29/*
30 * Note: section's mem_map is encoded to reflect its start_pfn.
31 * section[i].section_mem_map == mem_map's address - start_pfn;
32 */
33#define __page_to_pfn(pg)					\
34({	const struct page *__pg = (pg);				\
35	int __sec = page_to_section(__pg);			\
36	(unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec)));	\
37})
38
39#define __pfn_to_page(pfn)				\
40({	unsigned long __pfn = (pfn);			\
41	struct mem_section *__sec = __pfn_to_section(__pfn);	\
42	__section_mem_map_addr(__sec) + __pfn;		\
43})
44#endif /* CONFIG_FLATMEM/SPARSEMEM */
45
46/*
47 * Convert a physical address to a Page Frame Number and back
48 */
49#define	__phys_to_pfn(paddr)	PHYS_PFN(paddr)
50#define	__pfn_to_phys(pfn)	PFN_PHYS(pfn)
51
52#define page_to_pfn __page_to_pfn
53#define pfn_to_page __pfn_to_page
54
55#endif /* __ASSEMBLY__ */
56
57#endif