machvec_init.h
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上传日期:2013-02-24
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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_mvnsh_mv = mv_"#system );
- #endif
- #endif /* GENERIC */
- #endif /* __SH_MACHVEC_INIT_H */