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-rw-r--r--include/xen/page.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/include/xen/page.h b/include/xen/page.h
new file mode 100644
index 000000000..285677b42
--- /dev/null
+++ b/include/xen/page.h
@@ -0,0 +1,48 @@
+/* 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)
+
+#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 */