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4.4.0-1128-aws
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include
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asm-generic
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Filename :
memory_model.h
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#ifndef __ASM_MEMORY_MODEL_H #define __ASM_MEMORY_MODEL_H #include <linux/pfn.h> #ifndef __ASSEMBLY__ #if defined(CONFIG_FLATMEM) #ifndef ARCH_PFN_OFFSET #define ARCH_PFN_OFFSET (0UL) #endif #elif defined(CONFIG_DISCONTIGMEM) #ifndef arch_pfn_to_nid #define arch_pfn_to_nid(pfn) pfn_to_nid(pfn) #endif #ifndef arch_local_page_offset #define arch_local_page_offset(pfn, nid) \ ((pfn) - NODE_DATA(nid)->node_start_pfn) #endif #endif /* CONFIG_DISCONTIGMEM */ /* * supports 3 memory models. */ #if defined(CONFIG_FLATMEM) #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_DISCONTIGMEM) #define __pfn_to_page(pfn) \ ({ unsigned long __pfn = (pfn); \ unsigned long __nid = arch_pfn_to_nid(__pfn); \ NODE_DATA(__nid)->node_mem_map + arch_local_page_offset(__pfn, __nid);\ }) #define __page_to_pfn(pg) \ ({ const struct page *__pg = (pg); \ struct pglist_data *__pgdat = NODE_DATA(page_to_nid(__pg)); \ (unsigned long)(__pg - __pgdat->node_mem_map) + \ __pgdat->node_start_pfn; \ }) #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); \ __section_mem_map_addr(__sec) + __pfn; \ }) #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */ /* * Convert a physical address to a Page Frame Number and back */ #define __phys_to_pfn(paddr) PHYS_PFN(paddr) #define __pfn_to_phys(pfn) PFN_PHYS(pfn) #define page_to_pfn __page_to_pfn #define pfn_to_page __pfn_to_page #endif /* __ASSEMBLY__ */ #endif