[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>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/asm-sparc64/head.h b/include/asm-sparc64/head.h
index ff76c0981b63..c4ac3e87aa50 100644
--- a/include/asm-sparc64/head.h
+++ b/include/asm-sparc64/head.h
@@ -24,6 +24,12 @@
 #define PANTHER_IMPL            0x0019 /* Ultra-IV+   */
 #define SERRANO_IMPL            0x0022 /* Ultra-IIIi+ */
 
+#define BRANCH_IF_SUN4V(tmp1,label)             \
+        sethi   %hi(is_sun4v), %tmp1;           \
+        lduw    [%tmp1 + %lo(is_sun4v)], %tmp1; \
+        brnz,pn %tmp1, label;                   \
+         nop
+
 #define BRANCH_IF_CHEETAH_BASE(tmp1,tmp2,label) \
         rdpr    %ver, %tmp1;                    \
         sethi   %hi(__CHEETAH_ID), %tmp2;       \