1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 29be4d457SJeremy Fitzhardinge #ifndef _XEN_PAGE_H 39be4d457SJeremy Fitzhardinge #define _XEN_PAGE_H 49be4d457SJeremy Fitzhardinge 51084b198SJulien Grall #include <asm/page.h> 61084b198SJulien Grall 71084b198SJulien Grall /* The hypercall interface supports only 4KB page */ 81084b198SJulien Grall #define XEN_PAGE_SHIFT 12 91084b198SJulien Grall #define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT) 101084b198SJulien Grall #define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1)) 111084b198SJulien Grall #define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK) 121084b198SJulien Grall 131084b198SJulien Grall /* 141084b198SJulien Grall * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE 151084b198SJulien Grall * XXX: Add a BUILD_BUG_ON? 161084b198SJulien Grall */ 171084b198SJulien Grall 181084b198SJulien Grall #define xen_pfn_to_page(xen_pfn) \ 1960901df3SRoss Lagerwall (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT))) 201084b198SJulien Grall #define page_to_xen_pfn(page) \ 2160901df3SRoss Lagerwall ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT)) 221084b198SJulien Grall 231084b198SJulien Grall #define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE) 241084b198SJulien Grall 251084b198SJulien Grall #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT) 261084b198SJulien Grall #define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT) 271084b198SJulien Grall 2820e71f2eSIsaku Yamahata #include <asm/xen/page.h> 299be4d457SJeremy Fitzhardinge 301084b198SJulien Grall /* Return the GFN associated to the first 4KB of the page */ xen_page_to_gfn(struct page * page)310df4f266SJulien Grallstatic inline unsigned long xen_page_to_gfn(struct page *page) 3228e98c2cSDavid Vrabel { 331084b198SJulien Grall return pfn_to_gfn(page_to_xen_pfn(page)); 3428e98c2cSDavid Vrabel } 3528e98c2cSDavid Vrabel 368b5d44a5SDavid Vrabel struct xen_memory_region { 37626d7508SJuergen Gross unsigned long start_pfn; 38626d7508SJuergen Gross unsigned long n_pfns; 398b5d44a5SDavid Vrabel }; 408b5d44a5SDavid Vrabel 4108b46d5dSIngo Molnar #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */ 428b5d44a5SDavid Vrabel 438b5d44a5SDavid Vrabel extern __initdata 448b5d44a5SDavid Vrabel struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS]; 459be4d457SJeremy Fitzhardinge 46aa24411bSDavid Vrabel extern unsigned long xen_released_pages; 47aa24411bSDavid Vrabel 489be4d457SJeremy Fitzhardinge #endif /* _XEN_PAGE_H */ 49