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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _XEN_PAGE_H3#define _XEN_PAGE_H4 5#include <asm/page.h>6 7/* The hypercall interface supports only 4KB page */8#define XEN_PAGE_SHIFT 129#define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT)10#define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1))11#define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK)12 13/*14 * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE15 * XXX: Add a BUILD_BUG_ON?16 */17 18#define xen_pfn_to_page(xen_pfn) \19 (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))20#define page_to_xen_pfn(page) \21 ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))22 23#define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE)24 25#define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)26#define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)27 28#include <asm/xen/page.h>29 30/* Return the GFN associated to the first 4KB of the page */31static inline unsigned long xen_page_to_gfn(struct page *page)32{33 return pfn_to_gfn(page_to_xen_pfn(page));34}35 36struct xen_memory_region {37 unsigned long start_pfn;38 unsigned long n_pfns;39};40 41#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */42 43extern __initdata44struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];45 46extern unsigned long xen_released_pages;47 48#endif /* _XEN_PAGE_H */49