// SPDX-License-Identifier: GPL-2.0 /* * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call * these on a UP or else you will halt and catch fire. ;) * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <asm/openprom.h> #include <asm/oplib.h> extern void restore_current(void); /* Start cpu with prom-tree node 'cpunode' using context described * by 'ctable_reg' in context 'ctx' at program counter 'pc'. * * XXX Have to look into what the return values mean. XXX */ int prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) { int ret; unsigned long flags; spin_lock_irqsave(&prom_lock, flags); switch(prom_vers) { case PROM_V0: case PROM_V2: default: ret = -1; break; case PROM_V3: ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); break; } restore_current(); spin_unlock_irqrestore(&prom_lock, flags); return ret; }