arch/sparc64/prom/init.c

   1 /* $Id: init.c,v 1.10 1999/09/21 14:35:59 davem Exp $
   2  * init.c:  Initialize internal variables used by the PROM
   3  *          library functions.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/string.h>
  12 #include <linux/ctype.h>
  13
  14 #include <asm/openprom.h>
  15 #include <asm/oplib.h>
  16
  17 enum prom_major_version prom_vers;
  18 unsigned int prom_rev, prom_prev;
  19
  20 /* The root node of the prom device tree. */
  21 int prom_root_node;
  22 int prom_stdin, prom_stdout;
  23 int prom_chosen_node;
  24
  25 /* You must call prom_init() before you attempt to use any of the
  26  * routines in the prom library.  It returns 0 on success, 1 on
  27  * failure.  It gets passed the pointer to the PROM vector.
  28  */
  29
  30 extern void prom_cif_init(void *, void *);
  31
  32 void __init prom_init(void *cif_handler, void *cif_stack)
  33 {
  34         char buffer[80], *p;
  35         int ints[3];
  36         int node;
  37         int i = 0;
  38         int bufadjust;
  39
  40         prom_vers = PROM_P1275;
  41
  42         prom_cif_init(cif_handler, cif_stack);
  43
  44         prom_root_node = prom_getsibling(0);
  45         if((prom_root_node == 0) || (prom_root_node == -1))
  46                 prom_halt();
  47
  48         prom_chosen_node = prom_finddevice(prom_chosen_path);
  49         if (!prom_chosen_node || prom_chosen_node == -1)
  50                 prom_halt();
  51
  52         prom_stdin = prom_getint (prom_chosen_node, "stdin");
  53         prom_stdout = prom_getint (prom_chosen_node, "stdout");
  54
  55         node = prom_finddevice("/openprom");
  56         if (!node || node == -1)
  57                 prom_halt();
  58
  59         prom_getstring (node, "version", buffer, sizeof (buffer));
  60
  61         prom_printf ("\n");
  62
  63         if (strncmp (buffer, "OBP ", 4))
  64                 goto strange_version;
  65
  66         /*
  67          * Version field is expected to be 'OBP xx.yy.zz date...'
  68          * However, Sun can't stick to this format very well, so
  69          * we need to check for 'OBP  xx.yy.zz date...' and adjust
  70          * accordingly. -spot
  71          */
  72
  73         if (strncmp (buffer, "OBP  ", 5))
  74                 bufadjust = 4;
  75         else
  76                 bufadjust = 5;
  77
  78         p = buffer + bufadjust;
  79         while (p && isdigit(*p) && i < 3) {
  80                 ints[i++] = simple_strtoul(p, NULL, 0);
  81                 if ((p = strchr(p, '.')) != NULL)
  82                         p++;
  83         }
  84         if (i != 3)
  85                 goto strange_version;
  86
  87         prom_rev = ints[1];
  88         prom_prev = (ints[0] << 16) | (ints[1] << 8) | ints[2];
  89
  90         printk ("PROMLIB: Sun IEEE Boot Prom %s\n", buffer + bufadjust);
  91
  92         /* Initialization successful. */
  93         return;
  94
  95 strange_version:
  96         prom_printf ("Strange OBP version `%s'.\n", buffer);
  97         prom_halt ();
  98 }