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