csky: Add jump-label implementation

Add jump-label implementation for static branch

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/arch/csky/include/asm/jump_label.h b/arch/csky/include/asm/jump_label.h
new file mode 100644
index 000000000000..d488ba6084bc
--- /dev/null
+++ b/arch/csky/include/asm/jump_label.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ASM_CSKY_JUMP_LABEL_H
+#define __ASM_CSKY_JUMP_LABEL_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+
+#define JUMP_LABEL_NOP_SIZE 4
+
+static __always_inline bool arch_static_branch(struct static_key *key,
+					       bool branch)
+{
+	asm_volatile_goto(
+		"1:	nop32					\n"
+		"	.pushsection	__jump_table, \"aw\"	\n"
+		"	.align		2			\n"
+		"	.long		1b - ., %l[label] - .	\n"
+		"	.long		%0 - .			\n"
+		"	.popsection				\n"
+		:  :  "i"(&((char *)key)[branch]) :  : label);
+
+	return false;
+label:
+	return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key,
+						    bool branch)
+{
+	asm_volatile_goto(
+		"1:	bsr32		%l[label]		\n"
+		"	.pushsection	__jump_table, \"aw\"	\n"
+		"	.align		2			\n"
+		"	.long		1b - ., %l[label] - .	\n"
+		"	.long		%0 - .			\n"
+		"	.popsection				\n"
+		:  :  "i"(&((char *)key)[branch]) :  : label);
+
+	return false;
+label:
+	return true;
+}
+
+#endif  /* __ASSEMBLY__ */
+#endif	/* __ASM_CSKY_JUMP_LABEL_H */