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 128 /* == E820_MAX_ENTRIES_ZEROPAGE */ |
42 | |
43 | extern __initdata |
44 | struct xen_memory_region [XEN_EXTRA_MEM_MAX_REGIONS]; |
45 | |
46 | extern unsigned long xen_released_pages; |
47 | |
48 | #endif /* _XEN_PAGE_H */ |
49 | |