1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call 4 * these on a UP or else you will halt and catch fire. ;) 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 13 #include <asm/openprom.h> 14 #include <asm/oplib.h> 15 16 extern void restore_current(void); 17 18 /* Start cpu with prom-tree node 'cpunode' using context described 19 * by 'ctable_reg' in context 'ctx' at program counter 'pc'. 20 * 21 * XXX Have to look into what the return values mean. XXX 22 */ 23 int 24 prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) 25 { 26 int ret; 27 unsigned long flags; 28 29 spin_lock_irqsave(&prom_lock, flags); 30 switch(prom_vers) { 31 case PROM_V0: 32 case PROM_V2: 33 default: 34 ret = -1; 35 break; 36 case PROM_V3: 37 ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); 38 break; 39 } 40 restore_current(); 41 spin_unlock_irqrestore(&prom_lock, flags); 42 43 return ret; 44 } 45