| 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 | /* avoid <linux/mm.h> include hell */ |
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| 23 | extern unsigned long max_mapnr; |
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| 24 | |
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| 25 | #ifndef pfn_valid |
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| 26 | static inline int pfn_valid(unsigned long pfn) |
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| 27 | { |
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| 28 | unsigned long pfn_offset = ARCH_PFN_OFFSET; |
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| 29 | |
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| 30 | return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr; |
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| 31 | } |
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| 32 | #define pfn_valid pfn_valid |
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| 33 | |
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| 34 | #ifndef for_each_valid_pfn |
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| 35 | #define for_each_valid_pfn(pfn, start_pfn, end_pfn) \ |
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| 36 | for ((pfn) = max_t(unsigned long, (start_pfn), ARCH_PFN_OFFSET); \ |
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| 37 | (pfn) < min_t(unsigned long, (end_pfn), \ |
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| 38 | ARCH_PFN_OFFSET + max_mapnr); \ |
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| 39 | (pfn)++) |
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| 40 | #endif /* for_each_valid_pfn */ |
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| 41 | #endif /* valid_pfn */ |
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| 42 | |
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| 43 | #elif defined(CONFIG_SPARSEMEM_VMEMMAP) |
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| 44 | |
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| 45 | /* memmap is virtually contiguous. */ |
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| 46 | #define __pfn_to_page(pfn) (vmemmap + (pfn)) |
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| 47 | #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) |
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| 48 | |
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| 49 | #elif defined(CONFIG_SPARSEMEM) |
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| 50 | /* |
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| 51 | * Note: section's mem_map is encoded to reflect its start_pfn. |
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| 52 | * section[i].section_mem_map == mem_map's address - start_pfn; |
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| 53 | */ |
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| 54 | #define __page_to_pfn(pg) \ |
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| 55 | ({ const struct page *__pg = (pg); \ |
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| 56 | int __sec = memdesc_section(__pg->flags); \ |
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| 57 | (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ |
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| 58 | }) |
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| 59 | |
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| 60 | #define __pfn_to_page(pfn) \ |
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| 61 | ({ unsigned long __pfn = (pfn); \ |
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| 62 | struct mem_section *__sec = __pfn_to_section(__pfn); \ |
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| 63 | __section_mem_map_addr(__sec) + __pfn; \ |
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| 64 | }) |
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| 65 | #endif /* CONFIG_FLATMEM/SPARSEMEM */ |
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| 66 | |
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| 67 | /* |
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| 68 | * Convert a physical address to a Page Frame Number and back |
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| 69 | */ |
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| 70 | #define __phys_to_pfn(paddr) PHYS_PFN(paddr) |
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| 71 | #define __pfn_to_phys(pfn) PFN_PHYS(pfn) |
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| 72 | |
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| 73 | #define page_to_pfn __page_to_pfn |
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| 74 | #define pfn_to_page __pfn_to_page |
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| 75 | |
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| 76 | #ifdef CONFIG_DEBUG_VIRTUAL |
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| 77 | #define page_to_phys(page) \ |
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| 78 | ({ \ |
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| 79 | unsigned long __pfn = page_to_pfn(page); \ |
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| 80 | \ |
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| 81 | WARN_ON_ONCE(!pfn_valid(__pfn)); \ |
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| 82 | PFN_PHYS(__pfn); \ |
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| 83 | }) |
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| 84 | #else |
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| 85 | #define page_to_phys(page) PFN_PHYS(page_to_pfn(page)) |
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| 86 | #endif /* CONFIG_DEBUG_VIRTUAL */ |
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| 87 | #define phys_to_page(phys) pfn_to_page(PHYS_PFN(phys)) |
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| 88 | |
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| 89 | #endif /* __ASSEMBLY__ */ |
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| 90 | |
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| 91 | #endif |
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| 92 | |
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