kernel/arch/m68k/emu/natfeat.c

   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
  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
  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
  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
  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 }