1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_MEMORY_MODEL_H 3*4882a593Smuzhiyun #define __ASM_MEMORY_MODEL_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/pfn.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #if defined(CONFIG_FLATMEM) 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #ifndef ARCH_PFN_OFFSET 12*4882a593Smuzhiyun #define ARCH_PFN_OFFSET (0UL) 13*4882a593Smuzhiyun #endif 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #elif defined(CONFIG_DISCONTIGMEM) 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #ifndef arch_pfn_to_nid 18*4882a593Smuzhiyun #define arch_pfn_to_nid(pfn) pfn_to_nid(pfn) 19*4882a593Smuzhiyun #endif 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #ifndef arch_local_page_offset 22*4882a593Smuzhiyun #define arch_local_page_offset(pfn, nid) \ 23*4882a593Smuzhiyun ((pfn) - NODE_DATA(nid)->node_start_pfn) 24*4882a593Smuzhiyun #endif 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #endif /* CONFIG_DISCONTIGMEM */ 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun /* 29*4882a593Smuzhiyun * supports 3 memory models. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun #if defined(CONFIG_FLATMEM) 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 34*4882a593Smuzhiyun #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ 35*4882a593Smuzhiyun ARCH_PFN_OFFSET) 36*4882a593Smuzhiyun #elif defined(CONFIG_DISCONTIGMEM) 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun #define __pfn_to_page(pfn) \ 39*4882a593Smuzhiyun ({ unsigned long __pfn = (pfn); \ 40*4882a593Smuzhiyun unsigned long __nid = arch_pfn_to_nid(__pfn); \ 41*4882a593Smuzhiyun NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ 42*4882a593Smuzhiyun }) 43*4882a593Smuzhiyun 44*4882a593Smuzhiyun #define __page_to_pfn(pg) \ 45*4882a593Smuzhiyun ({ const struct page *__pg = (pg); \ 46*4882a593Smuzhiyun struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ 47*4882a593Smuzhiyun (unsigned long)(__pg - __pgdat->node_mem_map) + \ 48*4882a593Smuzhiyun __pgdat->node_start_pfn; \ 49*4882a593Smuzhiyun }) 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #elif defined(CONFIG_SPARSEMEM_VMEMMAP) 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* memmap is virtually contiguous. */ 54*4882a593Smuzhiyun #define __pfn_to_page(pfn) (vmemmap + (pfn)) 55*4882a593Smuzhiyun #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun #elif defined(CONFIG_SPARSEMEM) 58*4882a593Smuzhiyun /* 59*4882a593Smuzhiyun * Note: section's mem_map is encoded to reflect its start_pfn. 60*4882a593Smuzhiyun * section[i].section_mem_map == mem_map's address - start_pfn; 61*4882a593Smuzhiyun */ 62*4882a593Smuzhiyun #define __page_to_pfn(pg) \ 63*4882a593Smuzhiyun ({ const struct page *__pg = (pg); \ 64*4882a593Smuzhiyun int __sec = page_to_section(__pg); \ 65*4882a593Smuzhiyun (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ 66*4882a593Smuzhiyun }) 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun #define __pfn_to_page(pfn) \ 69*4882a593Smuzhiyun ({ unsigned long __pfn = (pfn); \ 70*4882a593Smuzhiyun struct mem_section *__sec = __pfn_to_section(__pfn); \ 71*4882a593Smuzhiyun __section_mem_map_addr(__sec) + __pfn; \ 72*4882a593Smuzhiyun }) 73*4882a593Smuzhiyun #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */ 74*4882a593Smuzhiyun 75*4882a593Smuzhiyun /* 76*4882a593Smuzhiyun * Convert a physical address to a Page Frame Number and back 77*4882a593Smuzhiyun */ 78*4882a593Smuzhiyun #define __phys_to_pfn(paddr) PHYS_PFN(paddr) 79*4882a593Smuzhiyun #define __pfn_to_phys(pfn) PFN_PHYS(pfn) 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #define page_to_pfn __page_to_pfn 82*4882a593Smuzhiyun #define pfn_to_page __pfn_to_page 83*4882a593Smuzhiyun 84*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */ 85*4882a593Smuzhiyun 86*4882a593Smuzhiyun #endif 87