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-rw-r--r--kernel/arch/sparc/lib/NG4copy_to_user.S39
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/arch/sparc/lib/NG4copy_to_user.S b/kernel/arch/sparc/lib/NG4copy_to_user.S
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--- /dev/null
+++ b/kernel/arch/sparc/lib/NG4copy_to_user.S
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+/* 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"