arch/sparc/prom/p1275.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * p1275.c: Sun IEEE 1275 PROM low level interface routines
   4  *
   5  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/smp.h>
  11 #include <linux/string.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/irqflags.h>
  14
  15 #include <asm/openprom.h>
  16 #include <asm/oplib.h>
  17 #include <asm/spitfire.h>
  18 #include <asm/pstate.h>
  19 #include <asm/ldc.h>
  20
  21 struct {
  22         long prom_callback;                     /* 0x00 */
  23         void (*prom_cif_handler)(long *);       /* 0x08 */
  24 } p1275buf;
  25
  26 extern void prom_world(int);
  27
  28 extern void prom_cif_direct(unsigned long *args);
  29 extern void prom_cif_callback(void);
  30
  31 /*
  32  * This provides SMP safety on the p1275buf.
  33  */
  34 DEFINE_RAW_SPINLOCK(prom_entry_lock);
  35
  36 void p1275_cmd_direct(unsigned long *args)
  37 {
  38         unsigned long flags;
  39
  40         local_save_flags(flags);
  41         local_irq_restore((unsigned long)PIL_NMI);
  42         raw_spin_lock(&prom_entry_lock);
  43
  44         prom_world(1);
  45         prom_cif_direct(args);
  46         prom_world(0);
  47
  48         raw_spin_unlock(&prom_entry_lock);
  49         local_irq_restore(flags);
  50 }
  51
  52 void prom_cif_init(void *cif_handler, void *cif_stack)
  53 {
  54         p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
  55 }