/* 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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