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authorDavid Daney <ddaney@caviumnetworks.com>2010-12-28 13:26:23 -0800
committerRalf Baechle <ralf@linux-mips.org>2011-01-18 19:30:24 +0100
commit94bb0c1ab293c298a8852e4f10c4215bad6daa9b (patch)
treee4e7dfa18bf2ffd832a97d7ab67863b1b363c6fe /arch/mips/include/asm
parent8d662c8d34a05e8e47deaa9e22fe770dc557c2d3 (diff)
downloadblackbird-op-linux-94bb0c1ab293c298a8852e4f10c4215bad6daa9b.tar.gz
blackbird-op-linux-94bb0c1ab293c298a8852e4f10c4215bad6daa9b.zip
MIPS: jump label: Add MIPS support.
In order not to be left behind, we add jump label support for MIPS. Tested on 64-bit big endian (Octeon), and 32-bit little endian (malta/qemu). Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jason Baron <jbaron@redhat.com> Patchwork: https://patchwork.linux-mips.org/patch/1923/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm')
-rw-r--r--arch/mips/include/asm/jump_label.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h
new file mode 100644
index 000000000000..7622ccf75076
--- /dev/null
+++ b/arch/mips/include/asm/jump_label.h
@@ -0,0 +1,48 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2010 Cavium Networks, Inc.
+ */
+#ifndef _ASM_MIPS_JUMP_LABEL_H
+#define _ASM_MIPS_JUMP_LABEL_H
+
+#include <linux/types.h>
+
+#ifdef __KERNEL__
+
+#define JUMP_LABEL_NOP_SIZE 4
+
+#ifdef CONFIG_64BIT
+#define WORD_INSN ".dword"
+#else
+#define WORD_INSN ".word"
+#endif
+
+#define JUMP_LABEL(key, label) \
+ do { \
+ asm goto("1:\tnop\n\t" \
+ "nop\n\t" \
+ ".pushsection __jump_table, \"a\"\n\t" \
+ WORD_INSN " 1b, %l[" #label "], %0\n\t" \
+ ".popsection\n\t" \
+ : : "i" (key) : : label); \
+ } while (0)
+
+
+#endif /* __KERNEL__ */
+
+#ifdef CONFIG_64BIT
+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 /* _ASM_MIPS_JUMP_LABEL_H */
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