1 /*
2 * include/asm-sh/machvec_init.h
3 *
4 * Copyright 2000 Stuart Menefy (stuart.menefy@st.com)
5 *
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
8 *
9 * This file has goodies to help simplify instantiation of machine vectors.
10 */
11
12 #ifndef __SH_MACHVEC_INIT_H
13 #define __SH_MACHVEC_INIT_H
14
15 #include <linux/config.h>
16
17 /*
18 * In a GENERIC kernel, we have lots of these vectors floating about,
19 * all but one of which we want to go away. In a non-GENERIC kernel,
20 * we want only one, ever.
21 *
22 * Accomplish this in the GENERIC kernel by puting all of the vectors
23 * in the .init.data section where they'll go away. We'll copy the
24 * one we want to the real alpha_mv vector in setup_arch.
25 *
26 * Accomplish this in a non-GENERIC kernel by ifdef'ing out all but
27 * one of the vectors, which will not reside in .init.data. We then
28 * alias this one vector to alpha_mv, so no copy is needed.
29 *
30 * Upshot: set __initdata to nothing for non-GENERIC kernels.
31 *
32 * Note we do the same thing for the UNKNOWN kernel, as we need to write
33 * to the machine vector while setting it up.
34 */
35
36 #if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN)
37 #define __initmv __attribute__((unused,__section__ (".machvec.init")))
38 #define ALIAS_MV(x)
39 #else
40 #define __initmv
41
42 /* GCC actually has a syntax for defining aliases, but is under some
43 delusion that you shouldn't be able to declare it extern somewhere
44 else beforehand. Fine. We'll do it ourselves. */
45 #if 0
46 #define ALIAS_MV(system) \
47 struct sh_machine_vector sh_mv __attribute__((alias("mv_"#system)));
48 #else
49 #define ALIAS_MV(system) \
50 asm(".global sh_mv\nsh_mv = mv_"#system );
51 #endif
52 #endif /* GENERIC */
53
54 #endif /* __SH_MACHVEC_INIT_H */
55
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