1// SPDX-License-Identifier: GPL-2.0
2/*
3 * misc.c:  Miscellaneous prom functions that don't belong
4 *          anywhere else.
5 *
6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 */
8
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <asm/sun3-head.h>
13#include <asm/idprom.h>
14#include <asm/openprom.h>
15#include <asm/oplib.h>
16#include <asm/movs.h>
17
18/* Reset and reboot the machine with the command 'bcommand'. */
19void
20prom_reboot(char *bcommand)
21{
22	unsigned long flags;
23	local_irq_save(flags);
24	(*(romvec->pv_reboot))(bcommand);
25	local_irq_restore(flags);
26}
27
28/* Drop into the prom, with the chance to continue with the 'go'
29 * prom command.
30 */
31void
32prom_cmdline(void)
33{
34}
35
36/* Drop into the prom, but completely terminate the program.
37 * No chance of continuing.
38 */
39void
40prom_halt(void)
41{
42	unsigned long flags;
43again:
44	local_irq_save(flags);
45	(*(romvec->pv_halt))();
46	local_irq_restore(flags);
47	goto again; /* PROM is out to get me -DaveM */
48}
49
50typedef void (*sfunc_t)(void);
51
52/* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
53 * format type.  'num_bytes' is the number of bytes that your idbuf
54 * has space for.  Returns 0xff on error.
55 */
56unsigned char
57prom_get_idprom(char *idbuf, int num_bytes)
58{
59	int i, oldsfc;
60	GET_SFC(oldsfc);
61	SET_SFC(FC_CONTROL);
62	for(i=0;i<num_bytes; i++)
63	{
64		/* There is a problem with the GET_CONTROL_BYTE
65		macro; defining the extra variable
66		gets around it.
67		*/
68		int c;
69		GET_CONTROL_BYTE(SUN3_IDPROM_BASE + i, c);
70		idbuf[i] = c;
71	}
72	SET_SFC(oldsfc);
73	return idbuf[0];
74}
75
76/* Get the major prom version number. */
77int
78prom_version(void)
79{
80	return romvec->pv_romvers;
81}
82
83/* Get the prom plugin-revision. */
84int
85prom_getrev(void)
86{
87	return prom_rev;
88}
89
90/* Get the prom firmware print revision. */
91int
92prom_getprev(void)
93{
94	return prom_prev;
95}
96