[mirror_ubuntu-bionic-kernel.git] / include / linux / pfn.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PFN_H_
#define _LINUX_PFN_H_

#ifndef __ASSEMBLY__
#include <linux/types.h>

/*
 * pfn_t: encapsulates a page-frame number that is optionally backed
 * by memmap (struct page).  Whether a pfn_t has a 'struct page'
 * backing is indicated by flags in the high bits of the value.
 */
typedef struct {
	u64 val;
} pfn_t;
#endif

#define PFN_ALIGN(x)	(((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
#define PFN_UP(x)	(((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
#define PFN_PHYS(x)	((phys_addr_t)(x) << PAGE_SHIFT)
#define PHYS_PFN(x)	((unsigned long)((x) >> PAGE_SHIFT))

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
22a9835c DH	2	#ifndef _LINUX_PFN_H_
	3	#define _LINUX_PFN_H_
	4
947d0496 JF	5	#ifndef __ASSEMBLY__
947d0496 JF	6	#include <linux/types.h>
34c0fd54 DW	7
	8	/*
	9	* pfn_t: encapsulates a page-frame number that is optionally backed
	10	* by memmap (struct page). Whether a pfn_t has a 'struct page'
	11	* backing is indicated by flags in the high bits of the value.
	12	*/
	13	typedef struct {
db78c222	14	u64 val;
34c0fd54	15	} pfn_t;
947d0496 JF	16	#endif
947d0496 JF	17
22a9835c DH	18	#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
	19	#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
	20	#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
947d0496	21	#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)
8f235d1a	22	#define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT))
22a9835c DH	23
22a9835c DH	24	#endif