| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | #define XEN_PFN_PHYS(x) ((phys_addr_t)(x) << XEN_PAGE_SHIFT) |
| 28 | |
| 29 | #include <asm/xen/page.h> |
| 30 | |
| 31 | /* Return the GFN associated to the first 4KB of the page */ |
| 32 | static inline unsigned long xen_page_to_gfn(struct page *page) |
| 33 | { |
| 34 | return pfn_to_gfn(page_to_xen_pfn(page)); |
| 35 | } |
| 36 | |
| 37 | struct xen_memory_region { |
| 38 | unsigned long start_pfn; |
| 39 | unsigned long n_pfns; |
| 40 | }; |
| 41 | |
| 42 | #define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */ |
| 43 | |
| 44 | extern __initdata |
| 45 | struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS]; |
| 46 | |
| 47 | extern unsigned long xen_released_pages; |
| 48 | |
| 49 | #endif /* _XEN_PAGE_H */ |