1 #ifndef _LINUX_PFN_T_H_
2 #define _LINUX_PFN_T_H_
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
12 #define PFN_FLAGS_MASK (((unsigned long) ~PAGE_MASK) \
13 << (BITS_PER_LONG - PAGE_SHIFT))
14 #define PFN_SG_CHAIN (1UL << (BITS_PER_LONG - 1))
15 #define PFN_SG_LAST (1UL << (BITS_PER_LONG - 2))
16 #define PFN_DEV (1UL << (BITS_PER_LONG - 3))
17 #define PFN_MAP (1UL << (BITS_PER_LONG - 4))
19 static inline pfn_t
__pfn_to_pfn_t(unsigned long pfn
, unsigned long flags
)
21 pfn_t pfn_t
= { .val
= pfn
| (flags
& PFN_FLAGS_MASK
), };
26 /* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
27 static inline pfn_t
pfn_to_pfn_t(unsigned long pfn
)
29 return __pfn_to_pfn_t(pfn
, 0);
32 extern pfn_t
phys_to_pfn_t(dma_addr_t addr
, unsigned long flags
);
34 static inline bool pfn_t_has_page(pfn_t pfn
)
36 return (pfn
.val
& PFN_MAP
) == PFN_MAP
|| (pfn
.val
& PFN_DEV
) == 0;
39 static inline unsigned long pfn_t_to_pfn(pfn_t pfn
)
41 return pfn
.val
& ~PFN_FLAGS_MASK
;
44 static inline struct page
*pfn_t_to_page(pfn_t pfn
)
46 if (pfn_t_has_page(pfn
))
47 return pfn_to_page(pfn_t_to_pfn(pfn
));
51 static inline dma_addr_t
pfn_t_to_phys(pfn_t pfn
)
53 return PFN_PHYS(pfn_t_to_pfn(pfn
));
56 static inline void *pfn_t_to_virt(pfn_t pfn
)
58 if (pfn_t_has_page(pfn
))
59 return __va(pfn_t_to_phys(pfn
));
63 static inline pfn_t
page_to_pfn_t(struct page
*page
)
65 return pfn_to_pfn_t(page_to_pfn(page
));
68 static inline int pfn_t_valid(pfn_t pfn
)
70 return pfn_valid(pfn_t_to_pfn(pfn
));
74 static inline pte_t
pfn_t_pte(pfn_t pfn
, pgprot_t pgprot
)
76 return pfn_pte(pfn_t_to_pfn(pfn
), pgprot
);
80 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
81 static inline pmd_t
pfn_t_pmd(pfn_t pfn
, pgprot_t pgprot
)
83 return pfn_pmd(pfn_t_to_pfn(pfn
), pgprot
);
87 #ifdef __HAVE_ARCH_PTE_DEVMAP
88 static inline bool pfn_t_devmap(pfn_t pfn
)
90 const unsigned long flags
= PFN_DEV
|PFN_MAP
;
92 return (pfn
.val
& flags
) == flags
;
95 static inline bool pfn_t_devmap(pfn_t pfn
)
99 pte_t
pte_mkdevmap(pte_t pte
);
100 pmd_t
pmd_mkdevmap(pmd_t pmd
);
102 #endif /* _LINUX_PFN_T_H_ */
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