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TOMOYO Linux Cross Reference
Linux/include/linux/pfn_t.h

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  1 #ifndef _LINUX_PFN_T_H_
  2 #define _LINUX_PFN_T_H_
  3 #include <linux/mm.h>
  4 
  5 /*
  6  * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags
  7  * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry
  8  * PFN_SG_LAST - pfn references a page and is the last scatterlist entry
  9  * PFN_DEV - pfn is not covered by system memmap by default
 10  * PFN_MAP - pfn has a dynamic page mapping established by a device driver
 11  */
 12 #define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT))
 13 #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
 14 #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))
 15 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
 16 #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
 17 
 18 static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
 19 {
 20         pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
 21 
 22         return pfn_t;
 23 }
 24 
 25 /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
 26 static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
 27 {
 28         return __pfn_to_pfn_t(pfn, 0);
 29 }
 30 
 31 static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
 32 {
 33         return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
 34 }
 35 
 36 static inline bool pfn_t_has_page(pfn_t pfn)
 37 {
 38         return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0;
 39 }
 40 
 41 static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
 42 {
 43         return pfn.val & ~PFN_FLAGS_MASK;
 44 }
 45 
 46 static inline struct page *pfn_t_to_page(pfn_t pfn)
 47 {
 48         if (pfn_t_has_page(pfn))
 49                 return pfn_to_page(pfn_t_to_pfn(pfn));
 50         return NULL;
 51 }
 52 
 53 static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
 54 {
 55         return PFN_PHYS(pfn_t_to_pfn(pfn));
 56 }
 57 
 58 static inline void *pfn_t_to_virt(pfn_t pfn)
 59 {
 60         if (pfn_t_has_page(pfn))
 61                 return __va(pfn_t_to_phys(pfn));
 62         return NULL;
 63 }
 64 
 65 static inline pfn_t page_to_pfn_t(struct page *page)
 66 {
 67         return pfn_to_pfn_t(page_to_pfn(page));
 68 }
 69 
 70 static inline int pfn_t_valid(pfn_t pfn)
 71 {
 72         return pfn_valid(pfn_t_to_pfn(pfn));
 73 }
 74 
 75 #ifdef CONFIG_MMU
 76 static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
 77 {
 78         return pfn_pte(pfn_t_to_pfn(pfn), pgprot);
 79 }
 80 #endif
 81 
 82 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 83 static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
 84 {
 85         return pfn_pmd(pfn_t_to_pfn(pfn), pgprot);
 86 }
 87 #endif
 88 
 89 #ifdef __HAVE_ARCH_PTE_DEVMAP
 90 static inline bool pfn_t_devmap(pfn_t pfn)
 91 {
 92         const u64 flags = PFN_DEV|PFN_MAP;
 93 
 94         return (pfn.val & flags) == flags;
 95 }
 96 #else
 97 static inline bool pfn_t_devmap(pfn_t pfn)
 98 {
 99         return false;
100 }
101 pte_t pte_mkdevmap(pte_t pte);
102 pmd_t pmd_mkdevmap(pmd_t pmd);
103 #endif
104 #endif /* _LINUX_PFN_T_H_ */
105 

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