| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |