1 // SPDX-License-Identifier: GPL-2.0
3 * misc.c: Miscellaneous prom functions that don't belong
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/module.h>
14 #include <asm/openprom.h>
15 #include <asm/oplib.h>
16 #include <asm/auxio.h>
18 extern void restore_current(void);
20 DEFINE_SPINLOCK(prom_lock);
22 /* Reset and reboot the machine with the command 'bcommand'. */
24 prom_reboot(char *bcommand)
27 spin_lock_irqsave(&prom_lock, flags);
28 (*(romvec->pv_reboot))(bcommand);
31 spin_unlock_irqrestore(&prom_lock, flags);
34 /* Forth evaluate the expression contained in 'fstring'. */
36 prom_feval(char *fstring)
39 if(!fstring || fstring[0] == 0)
41 spin_lock_irqsave(&prom_lock, flags);
42 if(prom_vers == PROM_V0)
43 (*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
45 (*(romvec->pv_fortheval.v2_eval))(fstring);
47 spin_unlock_irqrestore(&prom_lock, flags);
49 EXPORT_SYMBOL(prom_feval);
51 /* Drop into the prom, with the chance to continue with the 'go'
59 spin_lock_irqsave(&prom_lock, flags);
60 (*(romvec->pv_abort))();
62 spin_unlock_irqrestore(&prom_lock, flags);
63 set_auxio(AUXIO_LED, 0);
66 /* Drop into the prom, but completely terminate the program.
67 * No chance of continuing.
74 spin_lock_irqsave(&prom_lock, flags);
75 (*(romvec->pv_halt))();
78 spin_unlock_irqrestore(&prom_lock, flags);
79 goto again; /* PROM is out to get me -DaveM */
82 typedef void (*sfunc_t)(void);
84 /* Set prom sync handler to call function 'funcp'. */
86 prom_setsync(sfunc_t funcp)
89 *romvec->pv_synchook = funcp;
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.
97 prom_get_idprom(char *idbuf, int num_bytes)
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))
109 /* Get the major prom version number. */
113 return romvec->pv_romvers;
116 /* Get the prom plugin-revision. */
123 /* Get the prom firmware print revision. */