[PATCH] x86: fix amd64-agp aperture validation

[mv-sheeva.git] / arch / i386 / kernel / e820.c

diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c
index 31f4670ef740289ae5fb5432c2980235f52e139b..829beec9247ea9736f246e64c0c545f95223c72b 100644 (file)
--- a/arch/i386/kernel/e820.c
+++ b/arch/i386/kernel/e820.c
@@ -825,6 +825,26 @@ void __init limit_regions(unsigned long long size)
        print_memory_map("limit_regions endfunc");
 }
 
+/*
+ * This function checks if any part of the range <start,end> is mapped
+ * with type.
+ */
+int
+e820_any_mapped(u64 start, u64 end, unsigned type)
+{
+       int i;
+       for (i = 0; i < e820.nr_map; i++) {
+               const struct e820entry *ei = &e820.map[i];
+               if (type && ei->type != type)
+                       continue;
+               if (ei->addr >= end || ei->addr + ei->size <= start)
+                       continue;
+               return 1;
+       }
+       return 0;
+}
+EXPORT_SYMBOL_GPL(e820_any_mapped);
+
  /*
   * This function checks if the entire range <start,end> is mapped with type.
   *