1 files changed, 16 insertions, 0 deletions

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index c133bd915f48..d9b96c65e594 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -173,6 +173,7 @@
  */
 #define __PV_BITS_31_24 0x81000000
 
+extern phys_addr_t (*arch_virt_to_idmap) (unsigned long x);
 extern unsigned long __pv_phys_offset;
 #define PHYS_OFFSET __pv_phys_offset
 
@@ -259,6 +260,21 @@ static inline void *phys_to_virt(phys_addr_t x)
 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 
 /*
+ * These are for systems that have a hardware interconnect supported alias of
+ * physical memory for idmap purposes.  Most cases should leave these
+ * untouched.
+ */
+static inline phys_addr_t __virt_to_idmap(unsigned long x)
+{
+        if (arch_virt_to_idmap)
+                return arch_virt_to_idmap(x);
+        else
+                return __virt_to_phys(x);
+}
+
+#define virt_to_idmap(x)        __virt_to_idmap((unsigned long)(x))
+
+/*
  * Virtual <-> DMA view memory address translations
  * Again, these are *only* valid on the kernel direct mapped RAM
  * memory.  Use of these is *deprecated* (and that doesn't mean