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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
a117e66e KH |
2 | #ifndef __ASM_MEMORY_MODEL_H |
3 | #define __ASM_MEMORY_MODEL_H | |
4 | ||
8f235d1a CG |
5 | #include <linux/pfn.h> |
6 | ||
a117e66e KH |
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 | ||
a117e66e KH |
28 | /* |
29 | * supports 3 memory models. | |
30 | */ | |
31 | #if defined(CONFIG_FLATMEM) | |
32 | ||
67de6482 AW |
33 | #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) |
34 | #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ | |
a117e66e KH |
35 | ARCH_PFN_OFFSET) |
36 | #elif defined(CONFIG_DISCONTIGMEM) | |
37 | ||
67de6482 | 38 | #define __pfn_to_page(pfn) \ |
a117e66e | 39 | ({ unsigned long __pfn = (pfn); \ |
c5d71243 | 40 | unsigned long __nid = arch_pfn_to_nid(__pfn); \ |
a117e66e KH |
41 | NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ |
42 | }) | |
43 | ||
67de6482 | 44 | #define __page_to_pfn(pg) \ |
aa462abe | 45 | ({ const struct page *__pg = (pg); \ |
a0140c1d KH |
46 | struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ |
47 | (unsigned long)(__pg - __pgdat->node_mem_map) + \ | |
48 | __pgdat->node_start_pfn; \ | |
a117e66e KH |
49 | }) |
50 | ||
8f6aac41 CL |
51 | #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |
52 | ||
af901ca1 | 53 | /* memmap is virtually contiguous. */ |
8f6aac41 | 54 | #define __pfn_to_page(pfn) (vmemmap + (pfn)) |
32272a26 | 55 | #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) |
8f6aac41 | 56 | |
a117e66e KH |
57 | #elif defined(CONFIG_SPARSEMEM) |
58 | /* | |
1a49123b | 59 | * Note: section's mem_map is encoded to reflect its start_pfn. |
a117e66e KH |
60 | * section[i].section_mem_map == mem_map's address - start_pfn; |
61 | */ | |
67de6482 | 62 | #define __page_to_pfn(pg) \ |
aa462abe | 63 | ({ const struct page *__pg = (pg); \ |
a117e66e | 64 | int __sec = page_to_section(__pg); \ |
f05b6284 | 65 | (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ |
a117e66e KH |
66 | }) |
67 | ||
67de6482 | 68 | #define __pfn_to_page(pfn) \ |
a117e66e KH |
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 */ | |
67de6482 | 74 | |
012dcef3 CH |
75 | /* |
76 | * Convert a physical address to a Page Frame Number and back | |
77 | */ | |
8f235d1a | 78 | #define __phys_to_pfn(paddr) PHYS_PFN(paddr) |
ae4f9769 | 79 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
012dcef3 | 80 | |
67de6482 AW |
81 | #define page_to_pfn __page_to_pfn |
82 | #define pfn_to_page __pfn_to_page | |
a117e66e KH |
83 | |
84 | #endif /* __ASSEMBLY__ */ | |
a117e66e KH |
85 | |
86 | #endif |