| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _XEN_PAGE_H |
| #define _XEN_PAGE_H |
| |
| #include <asm/page.h> |
| |
| /* The hypercall interface supports only 4KB page */ |
| #define XEN_PAGE_SHIFT 12 |
| #define XEN_PAGE_SIZE (_AC(1, UL) << XEN_PAGE_SHIFT) |
| #define XEN_PAGE_MASK (~(XEN_PAGE_SIZE-1)) |
| #define xen_offset_in_page(p) ((unsigned long)(p) & ~XEN_PAGE_MASK) |
| |
| /* |
| * We assume that PAGE_SIZE is a multiple of XEN_PAGE_SIZE |
| * XXX: Add a BUILD_BUG_ON? |
| */ |
| |
| #define xen_pfn_to_page(xen_pfn) \ |
| (pfn_to_page((unsigned long)(xen_pfn) >> (PAGE_SHIFT - XEN_PAGE_SHIFT))) |
| #define page_to_xen_pfn(page) \ |
| ((page_to_pfn(page)) << (PAGE_SHIFT - XEN_PAGE_SHIFT)) |
| |
| #define XEN_PFN_PER_PAGE (PAGE_SIZE / XEN_PAGE_SIZE) |
| |
| #define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT) |
| #define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT) |
| #define XEN_PFN_PHYS(x) ((phys_addr_t)(x) << XEN_PAGE_SHIFT) |
| |
| #include <asm/xen/page.h> |
| |
| /* Return the GFN associated to the first 4KB of the page */ |
| static inline unsigned long xen_page_to_gfn(struct page *page) |
| { |
| return pfn_to_gfn(page_to_xen_pfn(page)); |
| } |
| |
| struct xen_memory_region { |
| unsigned long start_pfn; |
| unsigned long n_pfns; |
| }; |
| |
| #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */ |
| |
| extern __initdata |
| struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS]; |
| |
| extern unsigned long xen_released_pages; |
| |
| #endif /* _XEN_PAGE_H */ |