// SPDX-License-Identifier: GPL-2.0 /* * arch/sh/kernel/machvec.c * * The SuperH machine vector setup handlers, yanked from setup.c * * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2002 - 2007 Paul Mundt */ #include <linux/init.h> #include <linux/string.h> #include <asm/machvec.h> #include <asm/sections.h> #include <asm/addrspace.h> #include <asm/setup.h> #include <asm/io.h> #include <asm/irq.h> #define MV_NAME_SIZE 32 #define for_each_mv(mv) \ for ((mv) = (struct sh_machine_vector *)&__machvec_start; \ (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \ (mv)++) static struct sh_machine_vector * __init get_mv_byname(const char *name) { struct sh_machine_vector *mv; for_each_mv(mv) if (strcasecmp(name, mv->mv_name) == 0) return mv; return NULL; } static unsigned int __initdata machvec_selected; static int __init early_parse_mv(char *from) { char mv_name[MV_NAME_SIZE] = ""; char *mv_end; char *mv_comma; int mv_len; struct sh_machine_vector *mvp; mv_end = strchr(from, ' '); if (mv_end == NULL) mv_end = from + strlen(from); mv_comma = strchr(from, ','); mv_len = mv_end - from; if (mv_len > (MV_NAME_SIZE-1)) mv_len = MV_NAME_SIZE-1; memcpy(mv_name, from, mv_len); mv_name[mv_len] = '\0'; from = mv_end; machvec_selected = 1; /* Boot with the generic vector */ if (strcmp(mv_name, "generic") == 0) return 0; mvp = get_mv_byname(mv_name); if (unlikely(!mvp)) { printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name); for_each_mv(mvp) printk("'%s', ", mvp->mv_name); printk("\n\n"); panic("Failed to select machvec '%s' -- halting.\n", mv_name); } else sh_mv = *mvp; return 0; } early_param("sh_mv", early_parse_mv); void __init sh_mv_setup(void) { /* * Only overload the machvec if one hasn't been selected on * the command line with sh_mv= */ if (!machvec_selected) { unsigned long machvec_size; machvec_size = ((unsigned long)&__machvec_end - (unsigned long)&__machvec_start); /* * Sanity check for machvec section alignment. Ensure * __initmv hasn't been misused. */ if (machvec_size % sizeof(struct sh_machine_vector)) panic("machvec misaligned, invalid __initmv use?"); /* * If the machvec hasn't been preselected, use the first * vector (usually the only one) from .machvec.init. */ if (machvec_size >= sizeof(struct sh_machine_vector)) sh_mv = *(struct sh_machine_vector *)&__machvec_start; } printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type()); /* * Manually walk the vec, fill in anything that the board hasn't yet * by hand, wrapping to the generic implementation. */ #define mv_set(elem) do { \ if (!sh_mv.mv_##elem) \ sh_mv.mv_##elem = generic_##elem; \ } while (0) mv_set(irq_demux); mv_set(mode_pins); mv_set(mem_init); }