init android origin source code

1 files changed, 42 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/arch/x86/include/asm/jump_label.h b/ANDROID_3.4.5/arch/x86/include/asm/jump_label.h
new file mode 100644
index 00000000..3a16c148
--- /dev/null
+++ b/ANDROID_3.4.5/arch/x86/include/asm/jump_label.h
@@ -0,0 +1,42 @@
+#ifndef _ASM_X86_JUMP_LABEL_H
+#define _ASM_X86_JUMP_LABEL_H
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <asm/nops.h>
+#include <asm/asm.h>
+
+#define JUMP_LABEL_NOP_SIZE 5
+
+#define STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
+
+static __always_inline bool arch_static_branch(struct static_key *key)
+{
+	asm goto("1:"
+		STATIC_KEY_INITIAL_NOP
+		".pushsection __jump_table,  \"aw\" \n\t"
+		_ASM_ALIGN "\n\t"
+		_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
+		".popsection \n\t"
+		: :  "i" (key) : : l_yes);
+	return false;
+l_yes:
+	return true;
+}
+
+#endif /* __KERNEL__ */
+
+#ifdef CONFIG_X86_64
+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;
+};
+
+#endif