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 9a117e66eSKAMEZAWA Hiroyuki #if defined(CONFIG_FLATMEM) 10a117e66eSKAMEZAWA Hiroyuki 11a117e66eSKAMEZAWA Hiroyuki #ifndef ARCH_PFN_OFFSET 12a117e66eSKAMEZAWA Hiroyuki #define ARCH_PFN_OFFSET (0UL) 13a117e66eSKAMEZAWA Hiroyuki #endif 14a117e66eSKAMEZAWA Hiroyuki 15a117e66eSKAMEZAWA Hiroyuki #elif defined(CONFIG_DISCONTIGMEM) 16a117e66eSKAMEZAWA Hiroyuki 17a117e66eSKAMEZAWA Hiroyuki #ifndef arch_pfn_to_nid 18a117e66eSKAMEZAWA Hiroyuki #define arch_pfn_to_nid(pfn) pfn_to_nid(pfn) 19a117e66eSKAMEZAWA Hiroyuki #endif 20a117e66eSKAMEZAWA Hiroyuki 21a117e66eSKAMEZAWA Hiroyuki #ifndef arch_local_page_offset 22a117e66eSKAMEZAWA Hiroyuki #define arch_local_page_offset(pfn, nid) \ 23a117e66eSKAMEZAWA Hiroyuki ((pfn) - NODE_DATA(nid)->node_start_pfn) 24a117e66eSKAMEZAWA Hiroyuki #endif 25a117e66eSKAMEZAWA Hiroyuki 26a117e66eSKAMEZAWA Hiroyuki #endif /* CONFIG_DISCONTIGMEM */ 27a117e66eSKAMEZAWA Hiroyuki 28a117e66eSKAMEZAWA Hiroyuki /* 29a117e66eSKAMEZAWA Hiroyuki * supports 3 memory models. 30a117e66eSKAMEZAWA Hiroyuki */ 31a117e66eSKAMEZAWA Hiroyuki #if defined(CONFIG_FLATMEM) 32a117e66eSKAMEZAWA Hiroyuki 3367de6482SAndy Whitcroft #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 3467de6482SAndy Whitcroft #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ 35a117e66eSKAMEZAWA Hiroyuki ARCH_PFN_OFFSET) 36a117e66eSKAMEZAWA Hiroyuki #elif defined(CONFIG_DISCONTIGMEM) 37a117e66eSKAMEZAWA Hiroyuki 3867de6482SAndy Whitcroft #define __pfn_to_page(pfn) \ 39a117e66eSKAMEZAWA Hiroyuki ({ unsigned long __pfn = (pfn); \ 40c5d71243SRafael J. Wysocki unsigned long __nid = arch_pfn_to_nid(__pfn); \ 41a117e66eSKAMEZAWA Hiroyuki NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ 42a117e66eSKAMEZAWA Hiroyuki }) 43a117e66eSKAMEZAWA Hiroyuki 4467de6482SAndy Whitcroft #define __page_to_pfn(pg) \ 45aa462abeSIan Campbell ({ const struct page *__pg = (pg); \ 46a0140c1dSKAMEZAWA Hiroyuki struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ 47a0140c1dSKAMEZAWA Hiroyuki (unsigned long)(__pg - __pgdat->node_mem_map) + \ 48a0140c1dSKAMEZAWA Hiroyuki __pgdat->node_start_pfn; \ 49a117e66eSKAMEZAWA Hiroyuki }) 50a117e66eSKAMEZAWA Hiroyuki 518f6aac41SChristoph Lameter #elif defined(CONFIG_SPARSEMEM_VMEMMAP) 528f6aac41SChristoph Lameter 53af901ca1SAndré Goddard Rosa /* memmap is virtually contiguous. */ 548f6aac41SChristoph Lameter #define __pfn_to_page(pfn) (vmemmap + (pfn)) 5532272a26SMartin Schwidefsky #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) 568f6aac41SChristoph Lameter 57a117e66eSKAMEZAWA Hiroyuki #elif defined(CONFIG_SPARSEMEM) 58a117e66eSKAMEZAWA Hiroyuki /* 591a49123bSZhang Yanfei * Note: section's mem_map is encoded to reflect its start_pfn. 60a117e66eSKAMEZAWA Hiroyuki * section[i].section_mem_map == mem_map's address - start_pfn; 61a117e66eSKAMEZAWA Hiroyuki */ 6267de6482SAndy Whitcroft #define __page_to_pfn(pg) \ 63aa462abeSIan Campbell ({ const struct page *__pg = (pg); \ 64a117e66eSKAMEZAWA Hiroyuki int __sec = page_to_section(__pg); \ 65f05b6284SRandy Dunlap (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ 66a117e66eSKAMEZAWA Hiroyuki }) 67a117e66eSKAMEZAWA Hiroyuki 6867de6482SAndy Whitcroft #define __pfn_to_page(pfn) \ 69a117e66eSKAMEZAWA Hiroyuki ({ unsigned long __pfn = (pfn); \ 70a117e66eSKAMEZAWA Hiroyuki struct mem_section *__sec = __pfn_to_section(__pfn); \ 71a117e66eSKAMEZAWA Hiroyuki __section_mem_map_addr(__sec) + __pfn; \ 72a117e66eSKAMEZAWA Hiroyuki }) 73a117e66eSKAMEZAWA Hiroyuki #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */ 7467de6482SAndy Whitcroft 75012dcef3SChristoph Hellwig /* 76012dcef3SChristoph Hellwig * Convert a physical address to a Page Frame Number and back 77012dcef3SChristoph Hellwig */ 788f235d1aSChen Gang #define __phys_to_pfn(paddr) PHYS_PFN(paddr) 79ae4f9769STyler Baker #define __pfn_to_phys(pfn) PFN_PHYS(pfn) 80012dcef3SChristoph Hellwig 8167de6482SAndy Whitcroft #define page_to_pfn __page_to_pfn 8267de6482SAndy Whitcroft #define pfn_to_page __pfn_to_page 83a117e66eSKAMEZAWA Hiroyuki 84a117e66eSKAMEZAWA Hiroyuki #endif /* __ASSEMBLY__ */ 85a117e66eSKAMEZAWA Hiroyuki 86a117e66eSKAMEZAWA Hiroyuki #endif 87