24 lines
637 B
C
24 lines
637 B
C
#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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unsigned long 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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