aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/M7copy_to_user.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/M7copy_to_user.S')
-rw-r--r--arch/sparc/lib/M7copy_to_user.S51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/sparc/lib/M7copy_to_user.S b/arch/sparc/lib/M7copy_to_user.S
new file mode 100644
index 000000000000..a60ac467f808
--- /dev/null
+++ b/arch/sparc/lib/M7copy_to_user.S
@@ -0,0 +1,51 @@
+/*
+ * M7copy_to_user.S: SPARC M7 optimized copy to userspace.
+ *
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ */
+
+
+#define EX_ST(x, y) \
+98: x; \
+ .section __ex_table,"a"; \
+ .align 4; \
+ .word 98b, y; \
+ .text; \
+ .align 4;
+
+#define EX_ST_FP(x, y) \
+98: x; \
+ .section __ex_table,"a"; \
+ .align 4; \
+ .word 98b, y##_fp; \
+ .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 M7copy_to_user
+#define STORE(type,src,addr) type##a src, [addr] %asi
+#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
+#define STORE_MRU_ASI ASI_ST_BLKINIT_MRU_S
+#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, raw_copy_in_user; \
+ nop
+#endif
+
+#include "M7memcpy.S"