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