[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>

2 files changed, 14 insertions, 15 deletions

diff --git a/arch/sparc64/prom/init.c b/arch/sparc64/prom/init.c
index f3cc2d8578b2..095755e428a6 100644
--- a/arch/sparc64/prom/init.c
+++ b/arch/sparc64/prom/init.c
@@ -18,7 +18,6 @@ enum prom_major_version prom_vers;
 unsigned int prom_rev, prom_prev;
 
 /* The root node of the prom device tree. */
-int prom_root_node;
 int prom_stdin, prom_stdout;
 int prom_chosen_node;
 
@@ -41,26 +40,22 @@ void __init prom_init(void *cif_handler, void *cif_stack)
 
         prom_cif_init(cif_handler, cif_stack);
 
-        prom_root_node = prom_getsibling(0);
-        if((prom_root_node == 0) || (prom_root_node == -1))
-                prom_halt();
-
         prom_chosen_node = prom_finddevice(prom_chosen_path);
         if (!prom_chosen_node || prom_chosen_node == -1)
                 prom_halt();
 
-        prom_stdin = prom_getint (prom_chosen_node, "stdin");
-        prom_stdout = prom_getint (prom_chosen_node, "stdout");
+        prom_stdin = prom_getint(prom_chosen_node, "stdin");
+        prom_stdout = prom_getint(prom_chosen_node, "stdout");
 
         node = prom_finddevice("/openprom");
         if (!node || node == -1)
                 prom_halt();
 
-        prom_getstring (node, "version", buffer, sizeof (buffer));
+        prom_getstring(node, "version", buffer, sizeof (buffer));
 
-        prom_printf ("\n");
+        prom_printf("\n");
 
-        if (strncmp (buffer, "OBP ", 4))
+        if (strncmp(buffer, "OBP ", 4))
                 goto strange_version;
 
         /*
@@ -70,7 +65,7 @@ void __init prom_init(void *cif_handler, void *cif_stack)
          * accordingly. -spot
          */
 
-        if (strncmp (buffer, "OBP  ", 5))
+        if (strncmp(buffer, "OBP  ", 5))
                 bufadjust = 4;
         else
                 bufadjust = 5;
@@ -87,7 +82,8 @@ void __init prom_init(void *cif_handler, void *cif_stack)
         prom_rev = ints[1];
         prom_prev = (ints[0] << 16) | (ints[1] << 8) | ints[2];
 
-        printk ("PROMLIB: Sun IEEE Boot Prom %s\n", buffer + bufadjust);
+        printk("PROMLIB: Sun IEEE Boot Prom %s\n", buffer + bufadjust);
+        printk("PROMLIB: Root node compatible: %s\n", prom_root_compatible);
 
         /* Initialization successful. */
         return;
diff --git a/arch/sparc64/prom/tree.c b/arch/sparc64/prom/tree.c
index b1ff9e87dcc6..49075abd7cbc 100644
--- a/arch/sparc64/prom/tree.c
+++ b/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;
 }