1 files changed, 33 insertions, 0 deletions

diff --git a/arch/sparc/lib/U3patch.S b/arch/sparc/lib/U3patch.S
new file mode 100644
index 000000000000..ecc302619a6e
--- /dev/null
+++ b/arch/sparc/lib/U3patch.S
@@ -0,0 +1,33 @@
+/* U3patch.S: Patch Ultra-I routines with Ultra-III variant.
+ *
+ * Copyright (C) 2004 David S. Miller <davem@redhat.com>
+ */
+
+#define BRANCH_ALWAYS   0x10680000
+#define NOP             0x01000000
+#define ULTRA3_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  cheetah_patch_copyops
+        .type   cheetah_patch_copyops,#function
+cheetah_patch_copyops:
+        ULTRA3_DO_PATCH(memcpy, U3memcpy)
+        ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user)
+        ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user)
+        retl
+         nop
+        .size   cheetah_patch_copyops,.-cheetah_patch_copyops