1/*
2 * misc.c:  Miscellaneous prom functions that don't belong
3 *          anywhere else.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/module.h>
12
13#include <asm/openprom.h>
14#include <asm/oplib.h>
15#include <asm/auxio.h>
16
17extern void restore_current(void);
18
19DEFINE_SPINLOCK(prom_lock);
20
21/* Reset and reboot the machine with the command 'bcommand'. */
22void
23prom_reboot(char *bcommand)
24{
25	unsigned long flags;
26	spin_lock_irqsave(&prom_lock, flags);
27	(*(romvec->pv_reboot))(bcommand);
28	/* Never get here. */
29	restore_current();
30	spin_unlock_irqrestore(&prom_lock, flags);
31}
32
33/* Forth evaluate the expression contained in 'fstring'. */
34void
35prom_feval(char *fstring)
36{
37	unsigned long flags;
38	if(!fstring || fstring[0] == 0)
39		return;
40	spin_lock_irqsave(&prom_lock, flags);
41	if(prom_vers == PROM_V0)
42		(*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
43	else
44		(*(romvec->pv_fortheval.v2_eval))(fstring);
45	restore_current();
46	spin_unlock_irqrestore(&prom_lock, flags);
47}
48EXPORT_SYMBOL(prom_feval);
49
50/* Drop into the prom, with the chance to continue with the 'go'
51 * prom command.
52 */
53void
54prom_cmdline(void)
55{
56	unsigned long flags;
57
58	spin_lock_irqsave(&prom_lock, flags);
59	(*(romvec->pv_abort))();
60	restore_current();
61	spin_unlock_irqrestore(&prom_lock, flags);
62	set_auxio(AUXIO_LED, 0);
63}
64
65/* Drop into the prom, but completely terminate the program.
66 * No chance of continuing.
67 */
68void __noreturn
69prom_halt(void)
70{
71	unsigned long flags;
72again:
73	spin_lock_irqsave(&prom_lock, flags);
74	(*(romvec->pv_halt))();
75	/* Never get here. */
76	restore_current();
77	spin_unlock_irqrestore(&prom_lock, flags);
78	goto again; /* PROM is out to get me -DaveM */
79}
80
81typedef void (*sfunc_t)(void);
82
83/* Set prom sync handler to call function 'funcp'. */
84void
85prom_setsync(sfunc_t funcp)
86{
87	if(!funcp) return;
88	*romvec->pv_synchook = funcp;
89}
90
91/* Get the idprom and stuff it into buffer 'idbuf'.  Returns the
92 * format type.  'num_bytes' is the number of bytes that your idbuf
93 * has space for.  Returns 0xff on error.
94 */
95unsigned char
96prom_get_idprom(char *idbuf, int num_bytes)
97{
98	int len;
99
100	len = prom_getproplen(prom_root_node, "idprom");
101	if((len>num_bytes) || (len==-1)) return 0xff;
102	if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
103		return idbuf[0];
104
105	return 0xff;
106}
107
108/* Get the major prom version number. */
109int
110prom_version(void)
111{
112	return romvec->pv_romvers;
113}
114
115/* Get the prom plugin-revision. */
116int
117prom_getrev(void)
118{
119	return prom_rev;
120}
121
122/* Get the prom firmware print revision. */
123int
124prom_getprev(void)
125{
126	return prom_prev;
127}
128