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/config.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/openprom.h>
  14 #include <asm/oplib.h>
  15 #include <asm/sun4prom.h>
  16
  17 struct linux_romvec *romvec;
  18 enum prom_major_version prom_vers;
  19 unsigned int prom_rev, prom_prev;
  20 linux_sun4_romvec *sun4_romvec;
  21
  22 /* The root node of the prom device tree. */
  23 int prom_root_node;
  24
  25 int prom_stdin, prom_stdout;
  26
  27 /* Pointer to the device tree operations structure. */
  28 struct linux_nodeops *prom_nodeops;
  29
  30 /* You must call prom_init() before you attempt to use any of the
  31  * routines in the prom library.  It returns 0 on success, 1 on
  32  * failure.  It gets passed the pointer to the PROM vector.
  33  */
  34
  35 extern void prom_meminit(void);
  36 extern void prom_ranges_init(void);
  37
  38 void __init prom_init(struct linux_romvec *rp)
  39 {
  40 #ifdef CONFIG_SUN4
  41         extern struct linux_romvec *sun4_prom_init(void);
  42         rp = sun4_prom_init();
  43 #endif
  44         romvec = rp;
  45
  46         switch(romvec->pv_romvers) {
  47         case 0:
  48                 prom_vers = PROM_V0;
  49                 break;
  50         case 2:
  51                 prom_vers = PROM_V2;
  52                 break;
  53         case 3:
  54                 prom_vers = PROM_V3;
  55                 break;
  56         case 40:
  57                 prom_vers = PROM_SUN4;
  58                 break;
  59         default:
  60                 prom_printf("PROMLIB: Bad PROM version %d\n",
  61                             romvec->pv_romvers);
  62                 prom_halt();
  63                 break;
  64         };
  65
  66         prom_rev = romvec->pv_plugin_revision;
  67         prom_prev = romvec->pv_printrev;
  68         prom_nodeops = romvec->pv_nodeops;
  69
  70         prom_root_node = prom_getsibling(0);
  71         if((prom_root_node == 0) || (prom_root_node == -1))
  72                 prom_halt();
  73
  74         if((((unsigned long) prom_nodeops) == 0) ||
  75            (((unsigned long) prom_nodeops) == -1))
  76                 prom_halt();
  77
  78         if(prom_vers == PROM_V2 || prom_vers == PROM_V3) {
  79                 prom_stdout = *romvec->pv_v2bootargs.fd_stdout;
  80                 prom_stdin  = *romvec->pv_v2bootargs.fd_stdin;
  81         }
  82
  83         prom_meminit();
  84
  85         prom_ranges_init();
  86
  87 #ifndef CONFIG_SUN4
  88         /* SUN4 prints this in sun4_prom_init */
  89         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  90                romvec->pv_romvers, prom_rev);
  91 #endif
  92
  93         /* Initialization successful. */
  94         return;
  95 }