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