[SPARC64]: Detect sun4v early in boot process.

We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.

Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.

Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/prom/tree.c

@@ -51,7 +51,7 @@ prom_getparent(int node)
 __inline__ int
 __prom_getsibling(int node)
 {
-	return p1275_cmd ("peer", P1275_INOUT(1, 1), node);
+	return p1275_cmd(prom_peer_name, P1275_INOUT(1, 1), node);
 }
 
 __inline__ int
@@ -59,9 +59,12 @@ prom_getsibling(int node)
 {
 	int sibnode;
 
-	if(node == -1) return 0;
+	if (node == -1)
+		return 0;
 	sibnode = __prom_getsibling(node);
-	if(sibnode == -1) return 0;
+	if (sibnode == -1)
+		return 0;
+
 	return sibnode;
 }