arch/sparc/prom/p1275.c

   1 /*
   2  * p1275.c: Sun IEEE 1275 PROM low level interface routines
   3  *
   4  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/smp.h>
  10 #include <linux/string.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/irqflags.h>
  13
  14 #include <asm/openprom.h>
  15 #include <asm/oplib.h>
  16 #include <asm/spitfire.h>
  17 #include <asm/pstate.h>
  18 #include <asm/ldc.h>
  19
  20 struct {
  21         long prom_callback;                     /* 0x00 */
  22         void (*prom_cif_handler)(long *);       /* 0x08 */
  23 } p1275buf;
  24
  25 extern void prom_world(int);
  26
  27 extern void prom_cif_direct(unsigned long *args);
  28 extern void prom_cif_callback(void);
  29
  30 /*
  31  * This provides SMP safety on the p1275buf.
  32  */
  33 DEFINE_RAW_SPINLOCK(prom_entry_lock);
  34
  35 void p1275_cmd_direct(unsigned long *args)
  36 {
  37         unsigned long flags;
  38
  39         local_save_flags(flags);
  40         local_irq_restore((unsigned long)PIL_NMI);
  41         raw_spin_lock(&prom_entry_lock);
  42
  43         prom_world(1);
  44         prom_cif_direct(args);
  45         prom_world(0);
  46
  47         raw_spin_unlock(&prom_entry_lock);
  48         local_irq_restore(flags);
  49 }
  50
  51 void prom_cif_init(void *cif_handler, void *cif_stack)
  52 {
  53         p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
  54 }