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>
18 #include <asm/processor.h>
20 #define MV_NAME_SIZE 32
22 #define for_each_mv(mv) \
23 for ((mv) = (struct sh_machine_vector *)&__machvec_start; \
24 (mv) && (unsigned long)(mv) < (unsigned long)&__machvec_end; \
27 static struct sh_machine_vector
* __init
get_mv_byname(const char *name
)
29 struct sh_machine_vector
*mv
;
32 if (strcasecmp(name
, mv
->mv_name
) == 0)
38 static unsigned int __initdata machvec_selected
;
40 static int __init
early_parse_mv(char *from
)
42 char mv_name
[MV_NAME_SIZE
] = "";
46 struct sh_machine_vector
*mvp
;
48 mv_end
= strchr(from
, ' ');
50 mv_end
= from
+ strlen(from
);
52 mv_comma
= strchr(from
, ',');
53 mv_len
= mv_end
- from
;
54 if (mv_len
> (MV_NAME_SIZE
-1))
55 mv_len
= MV_NAME_SIZE
-1;
56 memcpy(mv_name
, from
, mv_len
);
57 mv_name
[mv_len
] = '\0';
62 /* Boot with the generic vector */
63 if (strcmp(mv_name
, "generic") == 0)
66 mvp
= get_mv_byname(mv_name
);
68 printk("Available vectors:\n\n\t'%s', ", sh_mv
.mv_name
);
70 printk("'%s', ", mvp
->mv_name
);
72 panic("Failed to select machvec '%s' -- halting.\n",
79 early_param("sh_mv", early_parse_mv
);
81 void __init
sh_mv_setup(void)
84 * Only overload the machvec if one hasn't been selected on
85 * the command line with sh_mv=
87 if (!machvec_selected
) {
88 unsigned long machvec_size
;
90 machvec_size
= ((unsigned long)&__machvec_end
-
91 (unsigned long)&__machvec_start
);
94 * Sanity check for machvec section alignment. Ensure
95 * __initmv hasn't been misused.
97 if (machvec_size
% sizeof(struct sh_machine_vector
))
98 panic("machvec misaligned, invalid __initmv use?");
101 * If the machvec hasn't been preselected, use the first
102 * vector (usually the only one) from .machvec.init.
104 if (machvec_size
>= sizeof(struct sh_machine_vector
))
105 sh_mv
= *(struct sh_machine_vector
*)&__machvec_start
;
108 printk(KERN_NOTICE
"Booting machvec: %s\n", get_system_type());
111 * Manually walk the vec, fill in anything that the board hasn't yet
112 * by hand, wrapping to the generic implementation.
114 #define mv_set(elem) do { \
115 if (!sh_mv.mv_##elem) \
116 sh_mv.mv_##elem = generic_##elem; \