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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sh/machvec_init.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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+/*
+ * 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 */