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24 lines
666 B
24 lines
666 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_PFN_H_ |
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#define _LINUX_PFN_H_ |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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/* |
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* pfn_t: encapsulates a page-frame number that is optionally backed |
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* by memmap (struct page). Whether a pfn_t has a 'struct page' |
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* backing is indicated by flags in the high bits of the value. |
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*/ |
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typedef struct { |
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u64 val; |
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} pfn_t; |
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#endif |
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#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) |
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#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) |
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#define PFN_DOWN(x) ((x) >> PAGE_SHIFT) |
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#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT) |
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#define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) |
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#endif
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