xen: Add macros MB and GB

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Keir Fraser <keir@xen.org>
CC: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/include/asm-arm/config.h

@@ -142,7 +142,6 @@
 #define SLOT0_ENTRY_BITS  39
 #define SLOT0(slot) (_AT(vaddr_t,slot) << SLOT0_ENTRY_BITS)
 #define SLOT0_ENTRY_SIZE  SLOT0(1)
-#define GB(_gb)     (_AC(_gb, UL) << 30)
 
 #define VMAP_VIRT_START  GB(1)
 #define VMAP_VIRT_END    (VMAP_VIRT_START + GB(1) - 1)

xen/include/xen/config.h

@@ -69,6 +69,9 @@
 #define __force
 #define __bitwise
 
+#define MB(_mb)     (_AC(_mb, UL) << 20)
+#define GB(_gb)     (_AC(_gb, UL) << 30)
+
 #ifndef __ASSEMBLY__
 
 int current_domain_id(void);