1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2a117e66eSKAMEZAWA Hiroyuki #ifndef __ASM_MEMORY_MODEL_H 3a117e66eSKAMEZAWA Hiroyuki #define __ASM_MEMORY_MODEL_H 4a117e66eSKAMEZAWA Hiroyuki 58f235d1aSChen Gang #include <linux/pfn.h> 68f235d1aSChen Gang 7a117e66eSKAMEZAWA Hiroyuki #ifndef __ASSEMBLY__ 8a117e66eSKAMEZAWA Hiroyuki 9bb1c50d3SMike Rapoport /* 10bb1c50d3SMike Rapoport * supports 3 memory models. 11bb1c50d3SMike Rapoport */ 12a117e66eSKAMEZAWA Hiroyuki #if defined(CONFIG_FLATMEM) 13a117e66eSKAMEZAWA Hiroyuki 14a117e66eSKAMEZAWA Hiroyuki #ifndef ARCH_PFN_OFFSET 15a117e66eSKAMEZAWA Hiroyuki #define ARCH_PFN_OFFSET (0UL) 16a117e66eSKAMEZAWA Hiroyuki #endif 17a117e66eSKAMEZAWA Hiroyuki 1867de6482SAndy Whitcroft #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 1967de6482SAndy Whitcroft #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ 20a117e66eSKAMEZAWA Hiroyuki ARCH_PFN_OFFSET) 21a117e66eSKAMEZAWA Hiroyuki 22*e5080a96SMike Rapoport (IBM) #ifndef pfn_valid pfn_valid(unsigned long pfn)23*e5080a96SMike Rapoport (IBM)static inline int pfn_valid(unsigned long pfn) 24*e5080a96SMike Rapoport (IBM) { 25*e5080a96SMike Rapoport (IBM) /* avoid <linux/mm.h> include hell */ 26*e5080a96SMike Rapoport (IBM) extern unsigned long max_mapnr; 27*e5080a96SMike Rapoport (IBM) unsigned long pfn_offset = ARCH_PFN_OFFSET; 28*e5080a96SMike Rapoport (IBM) 29*e5080a96SMike Rapoport (IBM) return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; 30*e5080a96SMike Rapoport (IBM) } 31*e5080a96SMike Rapoport (IBM) #define pfn_valid pfn_valid 32*e5080a96SMike Rapoport (IBM) #endif 33*e5080a96SMike Rapoport (IBM) 348f6aac41SChristoph Lameter #elif defined(CONFIG_SPARSEMEM_VMEMMAP) 358f6aac41SChristoph Lameter 36af901ca1SAndré Goddard Rosa /* memmap is virtually contiguous. */ 378f6aac41SChristoph Lameter #define __pfn_to_page(pfn) (vmemmap + (pfn)) 3832272a26SMartin Schwidefsky #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) 398f6aac41SChristoph Lameter 40a117e66eSKAMEZAWA Hiroyuki #elif defined(CONFIG_SPARSEMEM) 41a117e66eSKAMEZAWA Hiroyuki /* 421a49123bSZhang Yanfei * Note: section's mem_map is encoded to reflect its start_pfn. 43a117e66eSKAMEZAWA Hiroyuki * section[i].section_mem_map == mem_map's address - start_pfn; 44a117e66eSKAMEZAWA Hiroyuki */ 4567de6482SAndy Whitcroft #define __page_to_pfn(pg) \ 46aa462abeSIan Campbell ({ const struct page *__pg = (pg); \ 47a117e66eSKAMEZAWA Hiroyuki int __sec = page_to_section(__pg); \ 48f05b6284SRandy Dunlap (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ 49a117e66eSKAMEZAWA Hiroyuki }) 50a117e66eSKAMEZAWA Hiroyuki 5167de6482SAndy Whitcroft #define __pfn_to_page(pfn) \ 52a117e66eSKAMEZAWA Hiroyuki ({ unsigned long __pfn = (pfn); \ 53a117e66eSKAMEZAWA Hiroyuki struct mem_section *__sec = __pfn_to_section(__pfn); \ 54a117e66eSKAMEZAWA Hiroyuki __section_mem_map_addr(__sec) + __pfn; \ 55a117e66eSKAMEZAWA Hiroyuki }) 56bb1c50d3SMike Rapoport #endif /* CONFIG_FLATMEM/SPARSEMEM */ 5767de6482SAndy Whitcroft 58012dcef3SChristoph Hellwig /* 59012dcef3SChristoph Hellwig * Convert a physical address to a Page Frame Number and back 60012dcef3SChristoph Hellwig */ 618f235d1aSChen Gang #define __phys_to_pfn(paddr) PHYS_PFN(paddr) 62ae4f9769STyler Baker #define __pfn_to_phys(pfn) PFN_PHYS(pfn) 63012dcef3SChristoph Hellwig 6467de6482SAndy Whitcroft #define page_to_pfn __page_to_pfn 6567de6482SAndy Whitcroft #define pfn_to_page __pfn_to_page 66a117e66eSKAMEZAWA Hiroyuki 67a117e66eSKAMEZAWA Hiroyuki #endif /* __ASSEMBLY__ */ 68a117e66eSKAMEZAWA Hiroyuki 69a117e66eSKAMEZAWA Hiroyuki #endif 70