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 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#define ALIAS_MV(system) \ 45 asm(".global sh_mv\nsh_mv = mv_"#system ); 46#endif /* GENERIC */ 47 48#endif /* __SH_MACHVEC_INIT_H */ 49