1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _XEN_PAGE_H 2 #ifndef _XEN_PAGE_H
3 #define _XEN_PAGE_H 3 #define _XEN_PAGE_H
4 4
5 #include <asm/page.h> 5 #include <asm/page.h>
6 6
7 /* The hypercall interface supports only 4KB p 7 /* The hypercall interface supports only 4KB page */
8 #define XEN_PAGE_SHIFT 12 8 #define XEN_PAGE_SHIFT 12
9 #define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAG 9 #define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT)
10 #define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1)) 10 #define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1))
11 #define xen_offset_in_page(p) ((unsigned lon 11 #define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK)
12 12
13 /* 13 /*
14 * We assume that PAGE_SIZE is a multiple of X 14 * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE
15 * XXX: Add a BUILD_BUG_ON? 15 * XXX: Add a BUILD_BUG_ON?
16 */ 16 */
17 17
18 #define xen_pfn_to_page(xen_pfn) \ 18 #define xen_pfn_to_page(xen_pfn) \
19 (pfn_to_page((unsigned long)(xen_pfn) 19 (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT)))
20 #define page_to_xen_pfn(page) \ 20 #define page_to_xen_pfn(page) \
21 ((page_to_pfn(page)) << (PAGE_SHIFT - 21 ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT))
22 22
23 #define XEN_PFN_PER_PAGE (PAGE_SIZE / X 23 #define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE)
24 24
25 #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT 25 #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)
26 #define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE- 26 #define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
27 27
28 #include <asm/xen/page.h> 28 #include <asm/xen/page.h>
29 29
30 /* Return the GFN associated to the first 4KB 30 /* Return the GFN associated to the first 4KB of the page */
31 static inline unsigned long xen_page_to_gfn(st 31 static inline unsigned long xen_page_to_gfn(struct page *page)
32 { 32 {
33 return pfn_to_gfn(page_to_xen_pfn(page 33 return pfn_to_gfn(page_to_xen_pfn(page));
34 } 34 }
35 35
36 struct xen_memory_region { 36 struct xen_memory_region {
37 unsigned long start_pfn; 37 unsigned long start_pfn;
38 unsigned long n_pfns; 38 unsigned long n_pfns;
39 }; 39 };
40 40
41 #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E8 41 #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */
42 42
43 extern __initdata 43 extern __initdata
44 struct xen_memory_region xen_extra_mem[XEN_EXT 44 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
45 45
46 extern unsigned long xen_released_pages; 46 extern unsigned long xen_released_pages;
47 47
48 #endif /* _XEN_PAGE_H */ 48 #endif /* _XEN_PAGE_H */
49 49
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