arch/sparc/prom/misc.c

   1 /* $Id: misc.c,v 1.18 2000/08/26 02:38:03 anton Exp $
   2  * misc.c:  Miscellaneous prom functions that don't belong
   3  *          anywhere else.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <asm/openprom.h>
  12 #include <asm/oplib.h>
  13 #include <asm/auxio.h>
  14 #include <asm/system.h>
  15
  16 extern void restore_current(void);
  17
  18 DEFINE_SPINLOCK(prom_lock);
  19
  20 /* Reset and reboot the machine with the command 'bcommand'. */
  21 void
  22 prom_reboot(char *bcommand)
  23 {
  24         unsigned long flags;
  25         spin_lock_irqsave(&prom_lock, flags);
  26         (*(romvec->pv_reboot))(bcommand);
  27         /* Never get here. */
  28         restore_current();
  29         spin_unlock_irqrestore(&prom_lock, flags);
  30 }
  31
  32 /* Forth evaluate the expression contained in 'fstring'. */
  33 void
  34 prom_feval(char *fstring)
  35 {
  36         unsigned long flags;
  37         if(!fstring || fstring[0] == 0)
  38                 return;
  39         spin_lock_irqsave(&prom_lock, flags);
  40         if(prom_vers == PROM_V0)
  41                 (*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
  42         else
  43                 (*(romvec->pv_fortheval.v2_eval))(fstring);
  44         restore_current();
  45         spin_unlock_irqrestore(&prom_lock, flags);
  46 }
  47
  48 /* Drop into the prom, with the chance to continue with the 'go'
  49  * prom command.
  50  */
  51 void
  52 prom_cmdline(void)
  53 {
  54         extern void install_obp_ticker(void);
  55         extern void install_linux_ticker(void);
  56         unsigned long flags;
  57
  58         spin_lock_irqsave(&prom_lock, flags);
  59         install_obp_ticker();
  60         (*(romvec->pv_abort))();
  61         restore_current();
  62         install_linux_ticker();
  63         spin_unlock_irqrestore(&prom_lock, flags);
  64 #ifdef CONFIG_SUN_AUXIO
  65         set_auxio(AUXIO_LED, 0);
  66 #endif
  67 }
  68
  69 /* Drop into the prom, but completely terminate the program.
  70  * No chance of continuing.
  71  */
  72 void
  73 prom_halt(void)
  74 {
  75         unsigned long flags;
  76 again:
  77         spin_lock_irqsave(&prom_lock, flags);
  78         (*(romvec->pv_halt))();
  79         /* Never get here. */
  80         restore_current();
  81         spin_unlock_irqrestore(&prom_lock, flags);
  82         goto again; /* PROM is out to get me -DaveM */
  83 }
  84
  85 typedef void (*sfunc_t)(void);
  86
  87 /* Set prom sync handler to call function 'funcp'. */
  88 void
  89 prom_setsync(sfunc_t funcp)
  90 {
  91         if(!funcp) return;
  92         *romvec->pv_synchook = funcp;
  93 }
  94
  95 /* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
  96  * format type.  'num_bytes' is the number of bytes that your idbuf
  97  * has space for.  Returns 0xff on error.
  98  */
  99 unsigned char
 100 prom_get_idprom(char *idbuf, int num_bytes)
 101 {
 102         int len;
 103
 104         len = prom_getproplen(prom_root_node, "idprom");
 105         if((len>num_bytes) || (len==-1)) return 0xff;
 106         if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
 107                 return idbuf[0];
 108
 109         return 0xff;
 110 }
 111
 112 /* Get the major prom version number. */
 113 int
 114 prom_version(void)
 115 {
 116         return romvec->pv_romvers;
 117 }
 118
 119 /* Get the prom plugin-revision. */
 120 int
 121 prom_getrev(void)
 122 {
 123         return prom_rev;
 124 }
 125
 126 /* Get the prom firmware print revision. */
 127 int
 128 prom_getprev(void)
 129 {
 130         return prom_prev;
 131 }