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 */
31 static inline unsigned long xen_page_to_gfn(struct page *page)
32 {
33 return pfn_to_gfn(page_to_xen_pfn(page));
34 }
35
36 struct 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
43 extern __initdata
44 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
45
46 extern unsigned long xen_released_pages;
47
48 #endif /* _XEN_PAGE_H */
49
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