/* SPDX-License-Identifier: GPL-2.0 */#ifndef __ASM_MEMORY_MODEL_H#define __ASM_MEMORY_MODEL_H #include <linux/pfn.h> #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) /* avoid <linux/mm.h> include hell */extern unsigned long max_mapnr; #ifndef pfn_validstatic inline int pfn_valid(unsigned long pfn){	unsigned long pfn_offset = ARCH_PFN_OFFSET; 	return pfn >= pfn_offset && (pfn - pfn_offset) < max_mapnr;}#define pfn_valid pfn_valid #ifndef for_each_valid_pfn#define for_each_valid_pfn(pfn, start_pfn, end_pfn)			 \	for ((pfn) = max_t(unsigned long, (start_pfn), ARCH_PFN_OFFSET); \	     (pfn) < min_t(unsigned long, (end_pfn),			 \			   ARCH_PFN_OFFSET + max_mapnr);		 \	     (pfn)++)#endif /* for_each_valid_pfn */#endif /* valid_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 = memdesc_section(__pg->flags);		\	(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/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 #ifdef CONFIG_DEBUG_VIRTUAL#define page_to_phys(page)						\({									\	unsigned long __pfn = page_to_pfn(page);			\									\	WARN_ON_ONCE(!pfn_valid(__pfn));				\	PFN_PHYS(__pfn);						\})#else#define page_to_phys(page)	PFN_PHYS(page_to_pfn(page))#endif /* CONFIG_DEBUG_VIRTUAL */#define phys_to_page(phys)	pfn_to_page(PHYS_PFN(phys)) #endif /* __ASSEMBLY__ */ #endif