xref: /kernel/linux/linux-6.6/arch/m68k/emu/natfeat.c (revision 62306a36) 
1/*
2 * natfeat.c - ARAnyM hardware support via Native Features (natfeats)
3 *
4 * Copyright (c) 2005 Petr Stehlik of ARAnyM dev team
5 *
6 * Reworked for Linux by Roman Zippel <zippel@linux-m68k.org>
7 *
8 * This software may be used and distributed according to the terms of
9 * the GNU General Public License (GPL), incorporated herein by reference.
10 */
11
12#include <linux/init.h>
13#include <linux/types.h>
14#include <linux/console.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/reboot.h>
19#include <linux/io.h>
20#include <asm/machdep.h>
21#include <asm/natfeat.h>
22
23extern long nf_get_id_phys(unsigned long feature_name);
24
25asm("\n"
26"	.global nf_get_id_phys,nf_call\n"
27"nf_get_id_phys:\n"
28"	.short	0x7300\n"
29"	rts\n"
30"nf_call:\n"
31"	.short	0x7301\n"
32"	rts\n"
33"1:	moveq.l	#0,%d0\n"
34"	rts\n"
35"	.section __ex_table,\"a\"\n"
36"	.long	nf_get_id_phys,1b\n"
37"	.long	nf_call,1b\n"
38"	.previous");
39EXPORT_SYMBOL_GPL(nf_call);
40
41long nf_get_id(const char *feature_name)
42{
43	/* feature_name may be in vmalloc()ed memory, so make a copy */
44	char name_copy[32];
45	size_t n;
46
47	n = strlcpy(name_copy, feature_name, sizeof(name_copy));
48	if (n >= sizeof(name_copy))
49		return 0;
50
51	return nf_get_id_phys(virt_to_phys(name_copy));
52}
53EXPORT_SYMBOL_GPL(nf_get_id);
54
55void nfprint(const char *fmt, ...)
56{
57	static char buf[256];
58	va_list ap;
59	int n;
60
61	va_start(ap, fmt);
62	n = vsnprintf(buf, 256, fmt, ap);
63	nf_call(nf_get_id("NF_STDERR"), virt_to_phys(buf));
64	va_end(ap);
65}
66
67static void nf_poweroff(void)
68{
69	long id = nf_get_id("NF_SHUTDOWN");
70
71	if (id)
72		nf_call(id);
73}
74
75void __init nf_init(void)
76{
77	unsigned long id, version;
78	char buf[256];
79
80	id = nf_get_id("NF_VERSION");
81	if (!id)
82		return;
83	version = nf_call(id);
84
85	id = nf_get_id("NF_NAME");
86	if (!id)
87		return;
88	nf_call(id, virt_to_phys(buf), 256);
89	buf[255] = 0;
90
91	pr_info("NatFeats found (%s, %lu.%lu)\n", buf, version >> 16,
92		version & 0xffff);
93
94	register_platform_power_off(nf_poweroff);
95}
96