DragonStub/inc/dragonstub/linux/pfn.h

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

#include "page_types.h"
#include "const.h"

#ifndef __ASSEMBLY__
#include "../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