LXR linux/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
  21struct {
  22        long prom_callback;                     /* 0x00 */
  23        void (*prom_cif_handler)(long *);       /* 0x08 */
  24} p1275buf;
  25
  26extern void prom_world(int);
  27
  28extern void prom_cif_direct(unsigned long *args);
  29extern void prom_cif_callback(void);
  30
  31/*
  32 * This provides SMP safety on the p1275buf.
  33 */
  34DEFINE_RAW_SPINLOCK(prom_entry_lock);
  35
  36void 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
  52void prom_cif_init(void *cif_handler, void *cif_stack)
  53{
  54        p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
  55}
  56