1 files changed, 54 insertions, 0 deletions
diff --git a/include/asm-sh/machvec_init.h b/include/asm-sh/machvec_init.h
new file mode 100644
index 000000000000..9e7de808f7f8
--- /dev/null
+++ b/include/asm-sh/machvec_init.h
@@ -0,0 +1,54 @@
+/*
+ * include/asm-sh/machvec_init.h
+ *
+ * Copyright 2000 Stuart Menefy (stuart.menefy@st.com)
+ *
+ * May be copied or modified under the terms of the GNU General Public
+ * License.  See linux/COPYING for more information.
+ *
+ * This file has goodies to help simplify instantiation of machine vectors.
+ */
+
+#ifndef __SH_MACHVEC_INIT_H
+#define __SH_MACHVEC_INIT_H
+
+#include <linux/config.h>
+
+/*
+ * In a GENERIC kernel, we have lots of these vectors floating about,
+ * all but one of which we want to go away.  In a non-GENERIC kernel,
+ * we want only one, ever.
+ *
+ * Accomplish this in the GENERIC kernel by puting all of the vectors
+ * in the .init.data section where they'll go away.  We'll copy the
+ * one we want to the real alpha_mv vector in setup_arch.
+ *
+ * Accomplish this in a non-GENERIC kernel by ifdef'ing out all but
+ * one of the vectors, which will not reside in .init.data.  We then
+ * alias this one vector to alpha_mv, so no copy is needed.
+ *
+ * Upshot: set __initdata to nothing for non-GENERIC kernels.
+ *
+ * Note we do the same thing for the UNKNOWN kernel, as we need to write
+ * to the machine vector while setting it up.
+ */
+
+#if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
+#define __initmv __attribute__((unused,__section__ (".machvec.init")))
+#define ALIAS_MV(x)
+#else
+#define __initmv
+
+/* GCC actually has a syntax for defining aliases, but is under some
+   delusion that you shouldn't be able to declare it extern somewhere
+   else beforehand.  Fine.  We'll do it ourselves.  */
+#if 0
+#define ALIAS_MV(system) \
+  struct sh_machine_vector sh_mv __attribute__((alias("mv_"#system)));
+#else
+#define ALIAS_MV(system) \
+  asm(".global sh_mv\nsh_mv = mv_"#system );
+#endif
+#endif /* GENERIC */
+
+#endif /* __SH_MACHVEC_INIT_H */