[SPARC64]: Do not assume sun4v chips have load-twin/store-init support.

Check the cpu type in the OBP device tree before committing to
using the optimized Niagara memcpy and memset implementation.

If we don't recognize the cpu type, use a completely generic
version.

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

1 files changed, 33 insertions, 0 deletions

diff --git a/arch/sparc64/lib/GENpatch.S b/arch/sparc64/lib/GENpatch.S
new file mode 100644
index 000000000000..fab9e89f16bd
--- /dev/null
+++ b/arch/sparc64/lib/GENpatch.S
@@ -0,0 +1,33 @@
+/* GENpatch.S: Patch Ultra-I routines with generic variant.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+
+#define BRANCH_ALWAYS   0x10680000
+#define NOP             0x01000000
+#define GEN_DO_PATCH(OLD, NEW)  \
+        sethi   %hi(NEW), %g1; \
+        or      %g1, %lo(NEW), %g1; \
+        sethi   %hi(OLD), %g2; \
+        or      %g2, %lo(OLD), %g2; \
+        sub     %g1, %g2, %g1; \
+        sethi   %hi(BRANCH_ALWAYS), %g3; \
+        sll     %g1, 11, %g1; \
+        srl     %g1, 11 + 2, %g1; \
+        or      %g3, %lo(BRANCH_ALWAYS), %g3; \
+        or      %g3, %g1, %g3; \
+        stw     %g3, [%g2]; \
+        sethi   %hi(NOP), %g3; \
+        or      %g3, %lo(NOP), %g3; \
+        stw     %g3, [%g2 + 0x4]; \
+        flush   %g2;
+
+        .globl  generic_patch_copyops
+        .type   generic_patch_copyops,#function
+generic_patch_copyops:
+        GEN_DO_PATCH(memcpy, GENmemcpy)
+        GEN_DO_PATCH(___copy_from_user, GENcopy_from_user)
+        GEN_DO_PATCH(___copy_to_user, GENcopy_to_user)
+        retl
+         nop
+        .size   generic_patch_copyops,.-generic_patch_copyops