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/io.h>
19 #include <asm/machdep.h>
20 #include <asm/natfeat.h>
21 
22 extern long nf_get_id_phys(unsigned long feature_name);
23 
24 asm("\n"
25 "	.global nf_get_id_phys,nf_call\n"
26 "nf_get_id_phys:\n"
27 "	.short	0x7300\n"
28 "	rts\n"
29 "nf_call:\n"
30 "	.short	0x7301\n"
31 "	rts\n"
32 "1:	moveq.l	#0,%d0\n"
33 "	rts\n"
34 "	.section __ex_table,\"a\"\n"
35 "	.long	nf_get_id_phys,1b\n"
36 "	.long	nf_call,1b\n"
37 "	.previous");
38 EXPORT_SYMBOL_GPL(nf_call);
39 
nf_get_id(const char * feature_name)40 long nf_get_id(const char *feature_name)
41 {
42 	/* feature_name may be in vmalloc()ed memory, so make a copy */
43 	char name_copy[32];
44 	size_t n;
45 
46 	n = strlcpy(name_copy, feature_name, sizeof(name_copy));
47 	if (n >= sizeof(name_copy))
48 		return 0;
49 
50 	return nf_get_id_phys(virt_to_phys(name_copy));
51 }
52 EXPORT_SYMBOL_GPL(nf_get_id);
53 
nfprint(const char * fmt,...)54 void nfprint(const char *fmt, ...)
55 {
56 	static char buf[256];
57 	va_list ap;
58 	int n;
59 
60 	va_start(ap, fmt);
61 	n = vsnprintf(buf, 256, fmt, ap);
62 	nf_call(nf_get_id("NF_STDERR"), virt_to_phys(buf));
63 	va_end(ap);
64 }
65 
nf_poweroff(void)66 static void nf_poweroff(void)
67 {
68 	long id = nf_get_id("NF_SHUTDOWN");
69 
70 	if (id)
71 		nf_call(id);
72 }
73 
nf_init(void)74 void __init nf_init(void)
75 {
76 	unsigned long id, version;
77 	char buf[256];
78 
79 	id = nf_get_id("NF_VERSION");
80 	if (!id)
81 		return;
82 	version = nf_call(id);
83 
84 	id = nf_get_id("NF_NAME");
85 	if (!id)
86 		return;
87 	nf_call(id, virt_to_phys(buf), 256);
88 	buf[255] = 0;
89 
90 	pr_info("NatFeats found (%s, %lu.%lu)\n", buf, version >> 16,
91 		version & 0xffff);
92 
93 	mach_power_off = nf_poweroff;
94 }
95