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-rw-r--r--arch/powerpc/include/asm/jump_label.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h
new file mode 100644
index 000000000..09297ec9f
--- /dev/null
+++ b/arch/powerpc/include/asm/jump_label.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ASM_POWERPC_JUMP_LABEL_H
+#define _ASM_POWERPC_JUMP_LABEL_H
+
+/*
+ * Copyright 2010 Michael Ellerman, IBM Corp.
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+#include <asm/feature-fixups.h>
+#include <asm/asm-const.h>
+
+#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
+#define JUMP_LABEL_NOP_SIZE 4
+
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\n\t"
+ "nop # arch_static_branch\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\n\t"
+ "b %l[l_yes] # arch_static_branch_jump\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+#ifdef CONFIG_PPC64
+typedef u64 jump_label_t;
+#else
+typedef u32 jump_label_t;
+#endif
+
+struct jump_entry {
+ jump_label_t code;
+ jump_label_t target;
+ jump_label_t key;
+};
+
+#else
+#define ARCH_STATIC_BRANCH(LABEL, KEY) \
+1098: nop; \
+ .pushsection __jump_table, "aw"; \
+ FTR_ENTRY_LONG 1098b, LABEL, KEY; \
+ .popsection
+#endif
+
+#endif /* _ASM_POWERPC_JUMP_LABEL_H */