1 /* 2 * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call 3 * these on a UP or else you will halt and catch fire. ;) 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 */ 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/sched.h> 11 12 #include <asm/openprom.h> 13 #include <asm/oplib.h> 14 15 extern void restore_current(void); 16 17 /* Start cpu with prom-tree node 'cpunode' using context described 18 * by 'ctable_reg' in context 'ctx' at program counter 'pc'. 19 * 20 * XXX Have to look into what the return values mean. XXX 21 */ 22 int 23 prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) 24 { 25 int ret; 26 unsigned long flags; 27 28 spin_lock_irqsave(&prom_lock, flags); 29 switch(prom_vers) { 30 case PROM_V0: 31 case PROM_V2: 32 default: 33 ret = -1; 34 break; 35 case PROM_V3: 36 ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); 37 break; 38 }; 39 restore_current(); 40 spin_unlock_irqrestore(&prom_lock, flags); 41 42 return ret; 43 } 44