1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _XEN_PAGE_H
 3#define _XEN_PAGE_H
 4
 5#include <asm/page.h>
 6
 7/* The hypercall interface supports only 4KB page */
 8#define XEN_PAGE_SHIFT	12
 9#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_SIZE
15 * 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 __initdata
44struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
45
46extern unsigned long xen_released_pages;
47
48#endif	/* _XEN_PAGE_H */

 
 1#ifndef _XEN_PAGE_H
 2#define _XEN_PAGE_H
 3
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 4#include <asm/xen/page.h>
 5
 
 
 
 
 
 
 6struct xen_memory_region {
 7	phys_addr_t start;
 8	phys_addr_t size;
 9};
10
11#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */
12
13extern __initdata
14struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
15
16extern unsigned long xen_released_pages;
17
18#endif	/* _XEN_PAGE_H */