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 */ xen_page_to_gfn(struct page * 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 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