X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=arch%2Fx86%2Fxen%2Fsetup.c;fp=arch%2Fx86%2Fxen%2Fsetup.c;h=99ef82cc4edc3bd8c6e2b2674b0ce1c565998398;hb=e612b4a7db4ae1dd8c2bbe171e10c21723de95b2;hp=87251b4c2e303d0c18a37c9e0b82445ec373a150;hpb=5097cdf6cef15439f971df54f9abcf143d7ca698;p=firefly-linux-kernel-4.4.55.git

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 87251b4c2e30..99ef82cc4edc 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -573,6 +573,29 @@ static unsigned long __init xen_count_remap_pages(unsigned long max_pfn)
 	return extra;
 }
 
+bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
+{
+	struct e820entry *entry;
+	unsigned mapcnt;
+	phys_addr_t end;
+
+	if (!size)
+		return false;
+
+	end = start + size;
+	entry = xen_e820_map;
+
+	for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++) {
+		if (entry->type == E820_RAM && entry->addr <= start &&
+		    (entry->addr + entry->size) >= end)
+			return false;
+
+		entry++;
+	}
+
+	return true;
+}
+
 /*
  * Reserve Xen mfn_list.
  * See comment above "struct start_info" in <xen/interface/xen.h>