| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _LINUX_PFN_H_ |
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| 3 | #define _LINUX_PFN_H_ |
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| 4 | |
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| 5 | #ifndef __ASSEMBLY__ |
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| 6 | #include <linux/types.h> |
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| 7 | |
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| 8 | /* |
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| 9 | * pfn_t: encapsulates a page-frame number that is optionally backed |
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| 10 | * by memmap (struct page). Whether a pfn_t has a 'struct page' |
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| 11 | * backing is indicated by flags in the high bits of the value. |
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| 12 | */ |
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| 13 | typedef struct { |
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| 14 | u64 val; |
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| 15 | } pfn_t; |
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| 16 | #endif |
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| 17 | |
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| 18 | #define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) |
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| 19 | #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) |
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| 20 | #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) |
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| 21 | #define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT) |
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| 22 | #define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) |
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| 23 | |
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| 24 | #endif |
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| 25 | |
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