Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 2 | /* |
1da177e4 LT |
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 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
6943f3da SR |
12 | #include <linux/module.h> |
13 | ||
1da177e4 LT |
14 | #include <asm/openprom.h> |
15 | #include <asm/oplib.h> | |
16 | #include <asm/auxio.h> | |
1da177e4 LT |
17 | |
18 | extern void restore_current(void); | |
19 | ||
20 | DEFINE_SPINLOCK(prom_lock); | |
21 | ||
22 | /* Reset and reboot the machine with the command 'bcommand'. */ | |
23 | void | |
24 | prom_reboot(char *bcommand) | |
25 | { | |
26 | unsigned long flags; | |
27 | spin_lock_irqsave(&prom_lock, flags); | |
28 | (*(romvec->pv_reboot))(bcommand); | |
29 | /* Never get here. */ | |
30 | restore_current(); | |
31 | spin_unlock_irqrestore(&prom_lock, flags); | |
32 | } | |
33 | ||
34 | /* Forth evaluate the expression contained in 'fstring'. */ | |
35 | void | |
36 | prom_feval(char *fstring) | |
37 | { | |
38 | unsigned long flags; | |
39 | if(!fstring || fstring[0] == 0) | |
40 | return; | |
41 | spin_lock_irqsave(&prom_lock, flags); | |
42 | if(prom_vers == PROM_V0) | |
43 | (*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring); | |
44 | else | |
45 | (*(romvec->pv_fortheval.v2_eval))(fstring); | |
46 | restore_current(); | |
47 | spin_unlock_irqrestore(&prom_lock, flags); | |
48 | } | |
6943f3da | 49 | EXPORT_SYMBOL(prom_feval); |
1da177e4 | 50 | |
1da177e4 LT |
51 | /* Drop into the prom, with the chance to continue with the 'go' |
52 | * prom command. | |
53 | */ | |
54 | void | |
55 | prom_cmdline(void) | |
56 | { | |
1da177e4 LT |
57 | unsigned long flags; |
58 | ||
1da177e4 | 59 | spin_lock_irqsave(&prom_lock, flags); |
1da177e4 LT |
60 | (*(romvec->pv_abort))(); |
61 | restore_current(); | |
1da177e4 | 62 | spin_unlock_irqrestore(&prom_lock, flags); |
1da177e4 | 63 | set_auxio(AUXIO_LED, 0); |
1da177e4 LT |
64 | } |
65 | ||
66 | /* Drop into the prom, but completely terminate the program. | |
67 | * No chance of continuing. | |
68 | */ | |
5f66dd35 | 69 | void __noreturn |
1da177e4 LT |
70 | prom_halt(void) |
71 | { | |
72 | unsigned long flags; | |
73 | again: | |
74 | spin_lock_irqsave(&prom_lock, flags); | |
75 | (*(romvec->pv_halt))(); | |
76 | /* Never get here. */ | |
77 | restore_current(); | |
78 | spin_unlock_irqrestore(&prom_lock, flags); | |
79 | goto again; /* PROM is out to get me -DaveM */ | |
80 | } | |
81 | ||
82 | typedef void (*sfunc_t)(void); | |
83 | ||
84 | /* Set prom sync handler to call function 'funcp'. */ | |
85 | void | |
86 | prom_setsync(sfunc_t funcp) | |
87 | { | |
88 | if(!funcp) return; | |
89 | *romvec->pv_synchook = funcp; | |
90 | } | |
91 | ||
92 | /* Get the idprom and stuff it into buffer 'idbuf'. Returns the | |
93 | * format type. 'num_bytes' is the number of bytes that your idbuf | |
94 | * has space for. Returns 0xff on error. | |
95 | */ | |
96 | unsigned char | |
97 | prom_get_idprom(char *idbuf, int num_bytes) | |
98 | { | |
99 | int len; | |
100 | ||
101 | len = prom_getproplen(prom_root_node, "idprom"); | |
102 | if((len>num_bytes) || (len==-1)) return 0xff; | |
103 | if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes)) | |
104 | return idbuf[0]; | |
105 | ||
106 | return 0xff; | |
107 | } | |
108 | ||
109 | /* Get the major prom version number. */ | |
110 | int | |
111 | prom_version(void) | |
112 | { | |
113 | return romvec->pv_romvers; | |
114 | } | |
115 | ||
116 | /* Get the prom plugin-revision. */ | |
117 | int | |
118 | prom_getrev(void) | |
119 | { | |
120 | return prom_rev; | |
121 | } | |
122 | ||
123 | /* Get the prom firmware print revision. */ | |
124 | int | |
125 | prom_getprev(void) | |
126 | { | |
127 | return prom_prev; | |
128 | } |