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#define ALIAS_MV(system) \ 46 asm(".global sh_mv\nsh_mv = mv_"#system ); 47#endif /* GENERIC */ 48 49#endif /* __SH_MACHVEC_INIT_H */ 50