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

#include <asm/page.h>

/* The hypercall interface supports only 4KB page */
#define XEN_PAGE_SHIFT  12
#define XEN_PAGE_SIZE   (_AC(1, UL) << XEN_PAGE_SHIFT)
#define XEN_PAGE_MASK   (~(XEN_PAGE_SIZE-1))
#define xen_offset_in_page(p)   ((unsigned long)(p) & ~XEN_PAGE_MASK)

/*
 * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE
 * XXX: Add a BUILD_BUG_ON?
 */

#define xen_pfn_to_page(xen_pfn)        \
        (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))
#define page_to_xen_pfn(page)           \
        ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))

#define XEN_PFN_PER_PAGE        (PAGE_SIZE / XEN_PAGE_SIZE)

#define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)
#define XEN_PFN_UP(x)   (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)

#include <asm/xen/page.h>

/* Return the GFN associated to the first 4KB of the page */
static inline unsigned long xen_page_to_gfn(struct page *page)
{
        return pfn_to_gfn(page_to_xen_pfn(page));
}

struct xen_memory_region {
        unsigned long start_pfn;
        unsigned long n_pfns;
};

#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */

extern __initdata
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];

extern unsigned long xen_released_pages;

#endif  /* _XEN_PAGE_H */