| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef __ASM_MEMORY_MODEL_H |
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| 3 | #define __ASM_MEMORY_MODEL_H |
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| 4 | |
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| 5 | #include <linux/pfn.h> |
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| 6 | |
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| 7 | #ifndef __ASSEMBLY__ |
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| 8 | |
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| 9 | /* |
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| 10 | * supports 3 memory models. |
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| 11 | */ |
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| 12 | #if defined(CONFIG_FLATMEM) |
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| 13 | |
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| 14 | #ifndef ARCH_PFN_OFFSET |
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| 15 | #define ARCH_PFN_OFFSET (0UL) |
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| 16 | #endif |
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| 17 | |
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| 18 | #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) |
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| 19 | #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ |
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| 20 | ARCH_PFN_OFFSET) |
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| 21 | |
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| 22 | #ifndef pfn_valid |
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| 23 | static inline int pfn_valid(unsigned long pfn) |
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| 24 | { |
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| 25 | /* avoid <linux/mm.h> include hell */ |
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| 26 | extern unsigned long max_mapnr; |
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| 27 | unsigned long pfn_offset = ARCH_PFN_OFFSET; |
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| 28 | |
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| 29 | return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; |
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| 30 | } |
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| 31 | #define pfn_valid pfn_valid |
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| 32 | #endif |
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| 33 | |
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| 34 | #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |
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| 35 | |
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| 36 | /* memmap is virtually contiguous. */ |
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| 37 | #define __pfn_to_page(pfn) (vmemmap + (pfn)) |
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| 38 | #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) |
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| 39 | |
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| 40 | #elif defined(CONFIG_SPARSEMEM) |
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| 41 | /* |
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| 42 | * Note: section's mem_map is encoded to reflect its start_pfn. |
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| 43 | * section[i].section_mem_map == mem_map's address - start_pfn; |
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| 44 | */ |
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| 45 | #define __page_to_pfn(pg) \ |
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| 46 | ({ const struct page *__pg = (pg); \ |
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| 47 | int __sec = page_to_section(__pg); \ |
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| 48 | (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ |
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| 49 | }) |
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| 50 | |
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| 51 | #define __pfn_to_page(pfn) \ |
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| 52 | ({ unsigned long __pfn = (pfn); \ |
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| 53 | struct mem_section *__sec = __pfn_to_section(__pfn); \ |
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| 54 | __section_mem_map_addr(__sec) + __pfn; \ |
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| 55 | }) |
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| 56 | #endif /* CONFIG_FLATMEM/SPARSEMEM */ |
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| 57 | |
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| 58 | /* |
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| 59 | * Convert a physical address to a Page Frame Number and back |
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| 60 | */ |
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| 61 | #define __phys_to_pfn(paddr) PHYS_PFN(paddr) |
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| 62 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
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| 63 | |
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| 64 | #define page_to_pfn __page_to_pfn |
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| 65 | #define pfn_to_page __pfn_to_page |
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| 66 | |
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| 67 | #endif /* __ASSEMBLY__ */ |
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| 68 | |
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| 69 | #endif |
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| 70 | |
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