jump label: Add sparc64 support

Add jump label support for sparc64.

Signed-off-by: David S. Miller <davem@davemloft.net>
LKML-Reference: <3b5b071fcdb2afb7f67cacecfa78b14c740278a7.1284733808.git.jbaron@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>

[ cleaned up some formatting ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
new file mode 100644
index 000000000000..ea2dafc93d78
--- /dev/null
+++ b/arch/sparc/kernel/jump_label.c
@@ -0,0 +1,47 @@
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+
+#include <linux/jump_label.h>
+#include <linux/memory.h>
+
+#ifdef HAVE_JUMP_LABEL
+
+void arch_jump_label_transform(struct jump_entry *entry,
+                               enum jump_label_type type)
+{
+        u32 val;
+        u32 *insn = (u32 *) (unsigned long) entry->code;
+
+        if (type == JUMP_LABEL_ENABLE) {
+                s32 off = (s32)entry->target - (s32)entry->code;
+
+#ifdef CONFIG_SPARC64
+                /* ba,pt %xcc, . + (off << 2) */
+                val = 0x10680000 | ((u32) off >> 2);
+#else
+                /* ba . + (off << 2) */
+                val = 0x10800000 | ((u32) off >> 2);
+#endif
+        } else {
+                val = 0x01000000;
+        }
+
+        get_online_cpus();
+        mutex_lock(&text_mutex);
+        *insn = val;
+        flushi(insn);
+        mutex_unlock(&text_mutex);
+        put_online_cpus();
+}
+
+void arch_jump_label_text_poke_early(jump_label_t addr)
+{
+        u32 *insn_p = (u32 *) (unsigned long) addr;
+
+        *insn_p = 0x01000000;
+        flushi(insn_p);
+}
+
+#endif