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