sh: oprofile: Refactor common setup code for multiple driver support.

This re-implements the old op_model_null code in to something more
generic, where multiple drivers, backtrace, etc. can all be interfaced.
Based largely on arch/mips/oprofile/common.c.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/oprofile/op_impl.h

@@ -0,0 +1,33 @@
+#ifndef __OP_IMPL_H
+#define __OP_IMPL_H
+
+/* Per-counter configuration as set via oprofilefs.  */
+struct op_counter_config {
+	unsigned long enabled;
+	unsigned long event;
+
+	unsigned long long count;
+
+	/* Dummy values for userspace tool compliance */
+	unsigned long kernel;
+	unsigned long user;
+	unsigned long unit_mask;
+};
+
+/* Per-architecture configury and hooks.  */
+struct op_sh_model {
+	void (*reg_setup)(struct op_counter_config *);
+	int (*create_files)(struct super_block *sb, struct dentry *dir);
+	void (*cpu_setup)(void *dummy);
+	int (*init)(void);
+	void (*exit)(void);
+	void (*cpu_start)(void *args);
+	void (*cpu_stop)(void *args);
+	char *cpu_type;
+	unsigned char num_counters;
+};
+
+/* arch/sh/oprofile/common.c */
+extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+#endif /* __OP_IMPL_H */