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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
/*
* 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 */
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