Line data Source code
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 : /* 10 : * supports 3 memory models. 11 : */ 12 : #if defined(CONFIG_FLATMEM) 13 : 14 : #ifndef ARCH_PFN_OFFSET 15 : #define ARCH_PFN_OFFSET (0UL) 16 : #endif 17 : 18 : #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) 19 : #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ 20 : ARCH_PFN_OFFSET) 21 : 22 : #ifndef pfn_valid 23 : static inline int pfn_valid(unsigned long pfn) 24 : { 25 : /* avoid <linux/mm.h> include hell */ 26 : extern unsigned long max_mapnr; 27 54798 : unsigned long pfn_offset = ARCH_PFN_OFFSET; 28 : 29 54538 : return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; 30 : } 31 : #define pfn_valid pfn_valid 32 : #endif 33 : 34 : #elif defined(CONFIG_SPARSEMEM_VMEMMAP) 35 : 36 : /* memmap is virtually contiguous. */ 37 : #define __pfn_to_page(pfn) (vmemmap + (pfn)) 38 : #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) 39 : 40 : #elif defined(CONFIG_SPARSEMEM) 41 : /* 42 : * Note: section's mem_map is encoded to reflect its start_pfn. 43 : * section[i].section_mem_map == mem_map's address - start_pfn; 44 : */ 45 : #define __page_to_pfn(pg) \ 46 : ({ const struct page *__pg = (pg); \ 47 : int __sec = page_to_section(__pg); \ 48 : (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ 49 : }) 50 : 51 : #define __pfn_to_page(pfn) \ 52 : ({ unsigned long __pfn = (pfn); \ 53 : struct mem_section *__sec = __pfn_to_section(__pfn); \ 54 : __section_mem_map_addr(__sec) + __pfn; \ 55 : }) 56 : #endif /* CONFIG_FLATMEM/SPARSEMEM */ 57 : 58 : /* 59 : * Convert a physical address to a Page Frame Number and back 60 : */ 61 : #define __phys_to_pfn(paddr) PHYS_PFN(paddr) 62 : #define __pfn_to_phys(pfn) PFN_PHYS(pfn) 63 : 64 : #define page_to_pfn __page_to_pfn 65 : #define pfn_to_page __pfn_to_page 66 : 67 : #endif /* __ASSEMBLY__ */ 68 : 69 : #endif