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 <linux/module.h> |
13 | |
14 | #include <asm/openprom.h> |
15 | #include <asm/oplib.h> |
16 | #include <asm/auxio.h> |
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(lock: &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(lock: &prom_lock, flags); |
48 | } |
49 | EXPORT_SYMBOL(prom_feval); |
50 | |
51 | /* Drop into the prom, with the chance to continue with the 'go' |
52 | * prom command. |
53 | */ |
54 | void |
55 | prom_cmdline(void) |
56 | { |
57 | unsigned long flags; |
58 | |
59 | spin_lock_irqsave(&prom_lock, flags); |
60 | (*(romvec->pv_abort))(); |
61 | restore_current(); |
62 | spin_unlock_irqrestore(lock: &prom_lock, flags); |
63 | set_auxio(AUXIO_LED, 0); |
64 | } |
65 | |
66 | /* Drop into the prom, but completely terminate the program. |
67 | * No chance of continuing. |
68 | */ |
69 | void __noreturn |
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(lock: &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 | } |
129 | |