blob: 285677b42943ae03955dc96cc4c0e9c20f5570f9 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Jeremy Fitzhardinge9be4d452010-08-31 15:01:16 -07002#ifndef _XEN_PAGE_H
3#define _XEN_PAGE_H
4
Julien Grall1084b192015-05-04 15:47:16 +01005#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) \
Ross Lagerwall60901df2016-03-17 16:51:59 +000019 (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))
Julien Grall1084b192015-05-04 15:47:16 +010020#define page_to_xen_pfn(page) \
Ross Lagerwall60901df2016-03-17 16:51:59 +000021 ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))
Julien Grall1084b192015-05-04 15:47:16 +010022
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)
Julien Grall1084b192015-05-04 15:47:16 +010027
Isaku Yamahata20e71f2e2008-04-02 10:53:58 -070028#include <asm/xen/page.h>
Jeremy Fitzhardinge9be4d452010-08-31 15:01:16 -070029
Julien Grall1084b192015-05-04 15:47:16 +010030/* Return the GFN associated to the first 4KB of the page */
Julien Grall0df4f262015-08-07 17:34:37 +010031static inline unsigned long xen_page_to_gfn(struct page *page)
David Vrabel28e98c22015-01-13 17:16:42 +000032{
Julien Grall1084b192015-05-04 15:47:16 +010033 return pfn_to_gfn(page_to_xen_pfn(page));
David Vrabel28e98c22015-01-13 17:16:42 +000034}
35
David Vrabel8b5d44a2011-09-28 17:46:34 +010036struct xen_memory_region {
Juergen Gross626d7502015-09-04 14:05:51 +020037 unsigned long start_pfn;
38 unsigned long n_pfns;
David Vrabel8b5d44a2011-09-28 17:46:34 +010039};
40
Ingo Molnar08b46d52017-01-28 17:29:08 +010041#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */
David Vrabel8b5d44a2011-09-28 17:46:34 +010042
43extern __initdata
44struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
Jeremy Fitzhardinge9be4d452010-08-31 15:01:16 -070045
David Vrabelaa244112011-09-28 17:46:32 +010046extern unsigned long xen_released_pages;
47
Jeremy Fitzhardinge9be4d452010-08-31 15:01:16 -070048#endif /* _XEN_PAGE_H */