arch/sparc/prom/init.c

   1 /* $Id: init.c,v 1.14 2000/01/29 01:09:12 anton 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) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14 #include <asm/sun4prom.h>
  15
  16 struct linux_romvec *romvec;
  17 enum prom_major_version prom_vers;
  18 unsigned int prom_rev, prom_prev;
  19 linux_sun4_romvec *sun4_romvec;
  20
  21 /* The root node of the prom device tree. */
  22 int prom_root_node;
  23
  24 int prom_stdin, prom_stdout;
  25
  26 /* Pointer to the device tree operations structure. */
  27 struct linux_nodeops *prom_nodeops;
  28
  29 /* You must call prom_init() before you attempt to use any of the
  30  * routines in the prom library.  It returns 0 on success, 1 on
  31  * failure.  It gets passed the pointer to the PROM vector.
  32  */
  33
  34 extern void prom_meminit(void);
  35 extern void prom_ranges_init(void);
  36
  37 void __init prom_init(struct linux_romvec *rp)
  38 {
  39 #ifdef CONFIG_SUN4
  40         extern struct linux_romvec *sun4_prom_init(void);
  41         rp = sun4_prom_init();
  42 #endif
  43         romvec = rp;
  44
  45         switch(romvec->pv_romvers) {
  46         case 0:
  47                 prom_vers = PROM_V0;
  48                 break;
  49         case 2:
  50                 prom_vers = PROM_V2;
  51                 break;
  52         case 3:
  53                 prom_vers = PROM_V3;
  54                 break;
  55         case 40:
  56                 prom_vers = PROM_SUN4;
  57                 break;
  58         default:
  59                 prom_printf("PROMLIB: Bad PROM version %d\n",
  60                             romvec->pv_romvers);
  61                 prom_halt();
  62                 break;
  63         };
  64
  65         prom_rev = romvec->pv_plugin_revision;
  66         prom_prev = romvec->pv_printrev;
  67         prom_nodeops = romvec->pv_nodeops;
  68
  69         prom_root_node = prom_getsibling(0);
  70         if((prom_root_node == 0) || (prom_root_node == -1))
  71                 prom_halt();
  72
  73         if((((unsigned long) prom_nodeops) == 0) ||
  74            (((unsigned long) prom_nodeops) == -1))
  75                 prom_halt();
  76
  77         if(prom_vers == PROM_V2 || prom_vers == PROM_V3) {
  78                 prom_stdout = *romvec->pv_v2bootargs.fd_stdout;
  79                 prom_stdin  = *romvec->pv_v2bootargs.fd_stdin;
  80         }
  81
  82         prom_meminit();
  83
  84         prom_ranges_init();
  85
  86 #ifndef CONFIG_SUN4
  87         /* SUN4 prints this in sun4_prom_init */
  88         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  89                romvec->pv_romvers, prom_rev);
  90 #endif
  91
  92         /* Initialization successful. */
  93         return;
  94 }