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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 | ||
bb1c50d3 MR |
9 | /* |
10 | * supports 3 memory models. | |
11 | */ | |
a117e66e KH |
12 | #if defined(CONFIG_FLATMEM) |
13 | ||
14 | #ifndef ARCH_PFN_OFFSET | |
15 | #define ARCH_PFN_OFFSET (0UL) | |
16 | #endif | |
17 | ||
67de6482 AW |
18 | #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) |
19 | #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ | |
a117e66e | 20 | ARCH_PFN_OFFSET) |
a117e66e | 21 | |
e5080a96 MRI |
22 | #ifndef pfn_valid |
23 | static inline int pfn_valid(unsigned long pfn) | |
24 | { | |
25 | /* avoid <linux/mm.h> include hell */ | |
26 | extern unsigned long max_mapnr; | |
27 | unsigned long pfn_offset = ARCH_PFN_OFFSET; | |
28 | ||
29 | return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; | |
30 | } | |
31 | #define pfn_valid pfn_valid | |
32 | #endif | |
33 | ||
8f6aac41 CL |
34 | #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |
35 | ||
af901ca1 | 36 | /* memmap is virtually contiguous. */ |
8f6aac41 | 37 | #define __pfn_to_page(pfn) (vmemmap + (pfn)) |
32272a26 | 38 | #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) |
8f6aac41 | 39 | |
a117e66e KH |
40 | #elif defined(CONFIG_SPARSEMEM) |
41 | /* | |
1a49123b | 42 | * Note: section's mem_map is encoded to reflect its start_pfn. |
a117e66e KH |
43 | * section[i].section_mem_map == mem_map's address - start_pfn; |
44 | */ | |
67de6482 | 45 | #define __page_to_pfn(pg) \ |
aa462abe | 46 | ({ const struct page *__pg = (pg); \ |
a117e66e | 47 | int __sec = page_to_section(__pg); \ |
f05b6284 | 48 | (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ |
a117e66e KH |
49 | }) |
50 | ||
67de6482 | 51 | #define __pfn_to_page(pfn) \ |
a117e66e KH |
52 | ({ unsigned long __pfn = (pfn); \ |
53 | struct mem_section *__sec = __pfn_to_section(__pfn); \ | |
54 | __section_mem_map_addr(__sec) + __pfn; \ | |
55 | }) | |
bb1c50d3 | 56 | #endif /* CONFIG_FLATMEM/SPARSEMEM */ |
67de6482 | 57 | |
012dcef3 CH |
58 | /* |
59 | * Convert a physical address to a Page Frame Number and back | |
60 | */ | |
8f235d1a | 61 | #define __phys_to_pfn(paddr) PHYS_PFN(paddr) |
ae4f9769 | 62 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
012dcef3 | 63 | |
67de6482 AW |
64 | #define page_to_pfn __page_to_pfn |
65 | #define pfn_to_page __pfn_to_page | |
a117e66e KH |
66 | |
67 | #endif /* __ASSEMBLY__ */ | |
a117e66e KH |
68 | |
69 | #endif |