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