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 |
87 | |