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'. */
19 void
20 prom_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 */
31 void
32 prom_cmdline(void)
33 {
34 }
35
36 /* Drop into the prom, but completely terminate the program.
37 * No chance of continuing.
38 */
39 void
40 prom_halt(void)
41 {
42 unsigned long flags;
43 again:
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
50 typedef 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 */
56 unsigned char
57 prom_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. */
77 int
78 prom_version(void)
79 {
80 return romvec->pv_romvers;
81 }
82
83 /* Get the prom plugin-revision. */
84 int
85 prom_getrev(void)
86 {
87 return prom_rev;
88 }
89
90 /* Get the prom firmware print revision. */
91 int
92 prom_getprev(void)
93 {
94 return prom_prev;
95 }
96
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