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1da177e4 LT |
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 | ||
1da177e4 LT |
15 | |
16 | /* | |
17 | * In a GENERIC kernel, we have lots of these vectors floating about, | |
18 | * all but one of which we want to go away. In a non-GENERIC kernel, | |
19 | * we want only one, ever. | |
20 | * | |
21 | * Accomplish this in the GENERIC kernel by puting all of the vectors | |
22 | * in the .init.data section where they'll go away. We'll copy the | |
23 | * one we want to the real alpha_mv vector in setup_arch. | |
24 | * | |
25 | * Accomplish this in a non-GENERIC kernel by ifdef'ing out all but | |
26 | * one of the vectors, which will not reside in .init.data. We then | |
27 | * alias this one vector to alpha_mv, so no copy is needed. | |
28 | * | |
29 | * Upshot: set __initdata to nothing for non-GENERIC kernels. | |
30 | * | |
31 | * Note we do the same thing for the UNKNOWN kernel, as we need to write | |
32 | * to the machine vector while setting it up. | |
33 | */ | |
34 | ||
35 | #if defined(CONFIG_SH_GENERIC) || defined(CONFIG_SH_UNKNOWN) | |
36 | #define __initmv __attribute__((unused,__section__ (".machvec.init"))) | |
37 | #define ALIAS_MV(x) | |
38 | #else | |
39 | #define __initmv | |
40 | ||
41 | /* GCC actually has a syntax for defining aliases, but is under some | |
42 | delusion that you shouldn't be able to declare it extern somewhere | |
43 | else beforehand. Fine. We'll do it ourselves. */ | |
44 | #if 0 | |
45 | #define ALIAS_MV(system) \ | |
46 | struct sh_machine_vector sh_mv __attribute__((alias("mv_"#system))); | |
47 | #else | |
48 | #define ALIAS_MV(system) \ | |
49 | asm(".global sh_mv\nsh_mv = mv_"#system ); | |
50 | #endif | |
51 | #endif /* GENERIC */ | |
52 | ||
53 | #endif /* __SH_MACHVEC_INIT_H */ |