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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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2.4 kB · 91 lines
C
at master
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192/* 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