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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_MEMORY_MODEL_H #define __ASM_MEMORY_MODEL_H #include #ifndef __ASSEMBLY__ /* * supports 3 memory models. */ #if defined(CONFIG_FLATMEM) #ifndef ARCH_PFN_OFFSET #define ARCH_PFN_OFFSET (0UL) #endif #define __pfn_to_page(pfn) (mem_map + ((pfn) - ARCH_PFN_OFFSET)) #define __page_to_pfn(page) ((unsigned long)((page) - mem_map) + \ ARCH_PFN_OFFSET) #elif defined(CONFIG_SPARSEMEM_VMEMMAP) /* memmap is virtually contiguous. */ #define __pfn_to_page(pfn) (vmemmap + (pfn)) #define __page_to_pfn(page) (unsigned long)((page) - vmemmap) #elif defined(CONFIG_SPARSEMEM) /* * Note: section's mem_map is encoded to reflect its start_pfn. * section[i].section_mem_map == mem_map's address - start_pfn; */ #define __page_to_pfn(pg) \ ({ const struct page *__pg = (pg); \ int __sec = page_to_section(__pg); \ (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); \ }) #define __pfn_to_page(pfn) \ ({ unsigned long __pfn = (pfn); \ struct mem_section *__sec = __pfn_to_section(__pfn); \ _