Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sparc / lib / NG4copy_to_user.S

diff --git a/kernel/arch/sparc/lib/NG4copy_to_user.S b/kernel/arch/sparc/lib/NG4copy_to_user.S
new file mode 100644 (file)
index 0000000..9744c45
--- /dev/null
+++ b/kernel/arch/sparc/lib/NG4copy_to_user.S
@@ -0,0 +1,39 @@
+/* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
+ *
+ * Copyright (C) 2012 David S. Miller (davem@davemloft.net)
+ */
+
+#define EX_ST(x)               \
+98:    x;                      \
+       .section __ex_table,"a";\
+       .align 4;               \
+       .word 98b, __retl_one_asi;\
+       .text;                  \
+       .align 4;
+
+#ifndef ASI_AIUS
+#define ASI_AIUS       0x11
+#endif
+
+#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
+#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
+#endif
+
+#define FUNC_NAME              NG4copy_to_user
+#define STORE(type,src,addr)   type##a src, [addr] %asi
+#define STORE_ASI              ASI_BLK_INIT_QUAD_LDD_AIUS
+#define EX_RETVAL(x)           0
+
+#ifdef __KERNEL__
+       /* Writing to %asi is _expensive_ so we hardcode it.
+        * Reading %asi to check for KERNEL_DS is comparatively
+        * cheap.
+        */
+#define PREAMBLE                                       \
+       rd              %asi, %g1;                      \
+       cmp             %g1, ASI_AIUS;                  \
+       bne,pn          %icc, ___copy_in_user;          \
+        nop
+#endif
+
+#include "NG4memcpy.S"