projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 34c0fd54 DW |
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 (((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)) | |
| 18 | ||
| 19 | static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, unsigned long flags) | |
| 20 | { | |
| 21 | pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; | |
| 22 | ||
| 23 | return pfn_t; | |
| 24 | } | |
| 25 | ||
| 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) | |
| 28 | { | |
| 29 | return __pfn_to_pfn_t(pfn, 0); | |
| 30 | } | |
| 31 | ||
| 32 | extern pfn_t phys_to_pfn_t(dma_addr_t addr, unsigned long flags); | |
| 33 | ||
| 34 | static inline bool pfn_t_has_page(pfn_t pfn) | |
| 35 | { | |
| 36 | return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; | |
| 37 | } | |
| 38 | ||
| 39 | static inline unsigned long pfn_t_to_pfn(pfn_t pfn) | |
| 40 | { | |
| 41 | return pfn.val & ~PFN_FLAGS_MASK; | |
| 42 | } | |
| 43 | ||
| 44 | static inline struct page *pfn_t_to_page(pfn_t pfn) | |
| 45 | { | |
| 46 | if (pfn_t_has_page(pfn)) | |
| 47 | return pfn_to_page(pfn_t_to_pfn(pfn)); | |
| 48 | return NULL; | |
| 49 | } | |
| 50 | ||
| 51 | static inline dma_addr_t pfn_t_to_phys(pfn_t pfn) | |
| 52 | { | |
| 53 | return PFN_PHYS(pfn_t_to_pfn(pfn)); | |
| 54 | } | |
| 55 | ||
| 56 | static inline void *pfn_t_to_virt(pfn_t pfn) | |
| 57 | { | |
| 58 | if (pfn_t_has_page(pfn)) | |
| 59 | return __va(pfn_t_to_phys(pfn)); | |
| 60 | return NULL; | |
| 61 | } | |
| 62 | ||
| 63 | static inline pfn_t page_to_pfn_t(struct page *page) | |
| 64 | { | |
| 65 | return pfn_to_pfn_t(page_to_pfn(page)); | |
| 66 | } | |
| 67 | #endif /* _LINUX_PFN_T_H_ */ |