Merge branch 'master' into tk71

[mv-sheeva.git] / arch / mips / kernel / jump_label.c

diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c
new file mode 100644 (file)
index 0000000..6001610
--- /dev/null
+++ b/arch/mips/kernel/jump_label.c
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#include <linux/jump_label.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/cpu.h>
+
+#include <asm/cacheflush.h>
+#include <asm/inst.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+#define J_RANGE_MASK ((1ul << 28) - 1)
+
+void arch_jump_label_transform(struct jump_entry *e,
+                              enum jump_label_type type)
+{
+       union mips_instruction insn;
+       union mips_instruction *insn_p =
+               (union mips_instruction *)(unsigned long)e->code;
+
+       /* Jump only works within a 256MB aligned region. */
+       BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK));
+
+       /* Target must have 4 byte alignment. */
+       BUG_ON((e->target & 3) != 0);
+
+       if (type == JUMP_LABEL_ENABLE) {
+               insn.j_format.opcode = j_op;
+               insn.j_format.target = (e->target & J_RANGE_MASK) >> 2;
+       } else {
+               insn.word = 0; /* nop */
+       }
+
+       get_online_cpus();
+       mutex_lock(&text_mutex);
+       *insn_p = insn;
+
+       flush_icache_range((unsigned long)insn_p,
+                          (unsigned long)insn_p + sizeof(*insn_p));
+
+       mutex_unlock(&text_mutex);
+       put_online_cpus();
+}
+
+#endif /* HAVE_JUMP_LABEL */