1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sh/kernel/machvec.c
5 * The SuperH machine vector setup handlers, yanked from setup.c
7 * Copyright (C) 1999 Niibe Yutaka
8 * Copyright (C) 2002 - 2007 Paul Mundt
10 #include <linux/init.h>
11 #include <linux/string.h>
12 #include <asm/machvec.h>
13 #include <asm/sections.h>
14 #include <asm/addrspace.h>
15 #include <asm/setup.h>
19 #define MV_NAME_SIZE 32
21 #define for_each_mv(mv) \
22 for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
23 (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
26 static struct sh_machine_vector * __init get_mv_byname(const char *name)
28 struct sh_machine_vector *mv;
31 if (strcasecmp(name, mv->mv_name) == 0)
37 static unsigned int __initdata machvec_selected;
39 static int __init early_parse_mv(char *from)
41 char mv_name[MV_NAME_SIZE] = "";
45 struct sh_machine_vector *mvp;
47 mv_end = strchr(from, ' ');
49 mv_end = from + strlen(from);
51 mv_comma = strchr(from, ',');
52 mv_len = mv_end - from;
53 if (mv_len > (MV_NAME_SIZE-1))
54 mv_len = MV_NAME_SIZE-1;
55 memcpy(mv_name, from, mv_len);
56 mv_name[mv_len] = '\0';
61 /* Boot with the generic vector */
62 if (strcmp(mv_name, "generic") == 0)
65 mvp = get_mv_byname(mv_name);
67 printk("Available vectors:\n\n\t'%s', ", sh_mv.mv_name);
69 printk("'%s', ", mvp->mv_name);
71 panic("Failed to select machvec '%s' -- halting.\n",
78 early_param("sh_mv", early_parse_mv);
80 void __init sh_mv_setup(void)
83 * Only overload the machvec if one hasn't been selected on
84 * the command line with sh_mv=
86 if (!machvec_selected) {
87 unsigned long machvec_size;
89 machvec_size = ((unsigned long)&__machvec_end -
90 (unsigned long)&__machvec_start);
93 * Sanity check for machvec section alignment. Ensure
94 * __initmv hasn't been misused.
96 if (machvec_size % sizeof(struct sh_machine_vector))
97 panic("machvec misaligned, invalid __initmv use?");
100 * If the machvec hasn't been preselected, use the first
101 * vector (usually the only one) from .machvec.init.
103 if (machvec_size >= sizeof(struct sh_machine_vector))
104 sh_mv = *(struct sh_machine_vector *)&__machvec_start;
107 printk(KERN_NOTICE "Booting machvec: %s\n", get_system_type());
110 * Manually walk the vec, fill in anything that the board hasn't yet
111 * by hand, wrapping to the generic implementation.
113 #define mv_set(elem) do { \
114 if (!sh_mv.mv_##elem) \
115 sh_mv.mv_##elem = generic_##elem; \