tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* $Id: misc.c,v 1.18 2000/08/26 02:38:03 anton Exp $
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/config.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <asm/openprom.h>
13#include <asm/oplib.h>
14#include <asm/auxio.h>
15#include <asm/system.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}
48
49/* We want to do this more nicely some day. */
50extern void (*prom_palette)(int);
51
52/* Drop into the prom, with the chance to continue with the 'go'
53 * prom command.
54 */
55void
56prom_cmdline(void)
57{
58 extern void install_obp_ticker(void);
59 extern void install_linux_ticker(void);
60 unsigned long flags;
61
62 if(!serial_console && prom_palette)
63 prom_palette (1);
64 spin_lock_irqsave(&prom_lock, flags);
65 install_obp_ticker();
66 (*(romvec->pv_abort))();
67 restore_current();
68 install_linux_ticker();
69 spin_unlock_irqrestore(&prom_lock, flags);
70#ifdef CONFIG_SUN_AUXIO
71 set_auxio(AUXIO_LED, 0);
72#endif
73 if(!serial_console && prom_palette)
74 prom_palette (0);
75}
76
77/* Drop into the prom, but completely terminate the program.
78 * No chance of continuing.
79 */
80void
81prom_halt(void)
82{
83 unsigned long flags;
84again:
85 spin_lock_irqsave(&prom_lock, flags);
86 (*(romvec->pv_halt))();
87 /* Never get here. */
88 restore_current();
89 spin_unlock_irqrestore(&prom_lock, flags);
90 goto again; /* PROM is out to get me -DaveM */
91}
92
93typedef void (*sfunc_t)(void);
94
95/* Set prom sync handler to call function 'funcp'. */
96void
97prom_setsync(sfunc_t funcp)
98{
99 if(!funcp) return;
100 *romvec->pv_synchook = funcp;
101}
102
103/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
104 * format type. 'num_bytes' is the number of bytes that your idbuf
105 * has space for. Returns 0xff on error.
106 */
107unsigned char
108prom_get_idprom(char *idbuf, int num_bytes)
109{
110 int len;
111
112 len = prom_getproplen(prom_root_node, "idprom");
113 if((len>num_bytes) || (len==-1)) return 0xff;
114 if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
115 return idbuf[0];
116
117 return 0xff;
118}
119
120/* Get the major prom version number. */
121int
122prom_version(void)
123{
124 return romvec->pv_romvers;
125}
126
127/* Get the prom plugin-revision. */
128int
129prom_getrev(void)
130{
131 return prom_rev;
132}
133
134/* Get the prom firmware print revision. */
135int
136prom_getprev(void)
137{
138 return prom_prev;
139}