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Diffstat (limited to 'include/xen/page.h')
-rw-r--r--include/xen/page.h27
1 files changed, 26 insertions, 1 deletions
diff --git a/include/xen/page.h b/include/xen/page.h
index 1daae485e..96294ac93 100644
--- a/include/xen/page.h
+++ b/include/xen/page.h
@@ -1,11 +1,36 @@
#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) << XEN_PAGE_SHIFT) >> 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_pfn(page));
+ return pfn_to_gfn(page_to_xen_pfn(page));
}
struct xen_memory_region {