1*b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
288278ca2SAdrian Bunk /*
31da177e4SLinus Torvalds * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call
41da177e4SLinus Torvalds * these on a UP or else you will halt and catch fire. ;)
51da177e4SLinus Torvalds *
61da177e4SLinus Torvalds * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
71da177e4SLinus Torvalds */
81da177e4SLinus Torvalds
91da177e4SLinus Torvalds #include <linux/types.h>
101da177e4SLinus Torvalds #include <linux/kernel.h>
111da177e4SLinus Torvalds #include <linux/sched.h>
121da177e4SLinus Torvalds
131da177e4SLinus Torvalds #include <asm/openprom.h>
141da177e4SLinus Torvalds #include <asm/oplib.h>
151da177e4SLinus Torvalds
161da177e4SLinus Torvalds extern void restore_current(void);
171da177e4SLinus Torvalds
181da177e4SLinus Torvalds /* Start cpu with prom-tree node 'cpunode' using context described
191da177e4SLinus Torvalds * by 'ctable_reg' in context 'ctx' at program counter 'pc'.
201da177e4SLinus Torvalds *
211da177e4SLinus Torvalds * XXX Have to look into what the return values mean. XXX
221da177e4SLinus Torvalds */
231da177e4SLinus Torvalds int
prom_startcpu(int cpunode,struct linux_prom_registers * ctable_reg,int ctx,char * pc)241da177e4SLinus Torvalds prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
251da177e4SLinus Torvalds {
261da177e4SLinus Torvalds int ret;
271da177e4SLinus Torvalds unsigned long flags;
281da177e4SLinus Torvalds
291da177e4SLinus Torvalds spin_lock_irqsave(&prom_lock, flags);
301da177e4SLinus Torvalds switch(prom_vers) {
311da177e4SLinus Torvalds case PROM_V0:
321da177e4SLinus Torvalds case PROM_V2:
331da177e4SLinus Torvalds default:
341da177e4SLinus Torvalds ret = -1;
351da177e4SLinus Torvalds break;
361da177e4SLinus Torvalds case PROM_V3:
371da177e4SLinus Torvalds ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
381da177e4SLinus Torvalds break;
396cb79b3fSJoe Perches }
401da177e4SLinus Torvalds restore_current();
411da177e4SLinus Torvalds spin_unlock_irqrestore(&prom_lock, flags);
421da177e4SLinus Torvalds
431da177e4SLinus Torvalds return ret;
441da177e4SLinus Torvalds }
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