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/* 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 */