129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* misc.c: Miscellaneous prom functions that don't belong
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* anywhere else.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/auxio.h>
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extern void restore_current(void);
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DEFINE_SPINLOCK(prom_lock);
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/* Reset and reboot the machine with the command 'bcommand'. */
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void
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prom_reboot(char *bcommand)
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{
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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(*(romvec->pv_reboot))(bcommand);
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/* Never get here. */
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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}
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/* Forth evaluate the expression contained in 'fstring'. */
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void
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prom_feval(char *fstring)
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{
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unsigned long flags;
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if(!fstring || fstring[0] == 0)
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return;
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spin_lock_irqsave(&prom_lock, flags);
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if(prom_vers == PROM_V0)
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(*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
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else
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(*(romvec->pv_fortheval.v2_eval))(fstring);
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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}
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EXPORT_SYMBOL(prom_feval);
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/* Drop into the prom, with the chance to continue with the 'go'
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* prom command.
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*/
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void
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prom_cmdline(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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(*(romvec->pv_abort))();
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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set_auxio(AUXIO_LED, 0);
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}
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/* Drop into the prom, but completely terminate the program.
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* No chance of continuing.
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*/
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void __noreturn
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prom_halt(void)
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{
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unsigned long flags;
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again:
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spin_lock_irqsave(&prom_lock, flags);
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(*(romvec->pv_halt))();
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/* Never get here. */
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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goto again; /* PROM is out to get me -DaveM */
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}
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typedef void (*sfunc_t)(void);
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/* Set prom sync handler to call function 'funcp'. */
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void
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prom_setsync(sfunc_t funcp)
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{
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if(!funcp) return;
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*romvec->pv_synchook = funcp;
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}
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/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
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* format type. 'num_bytes' is the number of bytes that your idbuf
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* has space for. Returns 0xff on error.
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*/
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unsigned char
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prom_get_idprom(char *idbuf, int num_bytes)
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{
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int len;
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len = prom_getproplen(prom_root_node, "idprom");
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if((len>num_bytes) || (len==-1)) return 0xff;
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if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
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return idbuf[0];
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return 0xff;
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}
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/* Get the major prom version number. */
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int
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prom_version(void)
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{
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return romvec->pv_romvers;
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}
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/* Get the prom plugin-revision. */
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int
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prom_getrev(void)
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{
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return prom_rev;
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}
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/* Get the prom firmware print revision. */
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int
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prom_getprev(void)
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{
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return prom_prev;
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}
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