1/* $Id: mp.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $ 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 15extern void restore_current(void); 16 17int 18prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) 19{ 20 int ret; 21 unsigned long flags; 22 23 spin_lock_irqsave(&prom_lock, flags); 24 switch(prom_vers) { 25 case PROM_V0: 26 case PROM_V2: 27 default: 28 ret = -1; 29 break; 30 case PROM_V3: 31 ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); 32 break; 33 }; 34 restore_current(); 35 spin_unlock_irqrestore(&prom_lock, flags); 36 37 return ret; 38} 39 40int 41prom_stopcpu(int cpunode) 42{ 43 int ret; 44 unsigned long flags; 45 46 spin_lock_irqsave(&prom_lock, flags); 47 switch(prom_vers) { 48 case PROM_V0: 49 case PROM_V2: 50 default: 51 ret = -1; 52 break; 53 case PROM_V3: 54 ret = (*(romvec->v3_cpustop))(cpunode); 55 break; 56 }; 57 restore_current(); 58 spin_unlock_irqrestore(&prom_lock, flags); 59 60 return ret; 61} 62 63int 64prom_idlecpu(int cpunode) 65{ 66 int ret; 67 unsigned long flags; 68 69 spin_lock_irqsave(&prom_lock, flags); 70 switch(prom_vers) { 71 case PROM_V0: 72 case PROM_V2: 73 default: 74 ret = -1; 75 break; 76 case PROM_V3: 77 ret = (*(romvec->v3_cpuidle))(cpunode); 78 break; 79 }; 80 restore_current(); 81 spin_unlock_irqrestore(&prom_lock, flags); 82 83 return ret; 84} 85 86int 87prom_restartcpu(int cpunode) 88{ 89 int ret; 90 unsigned long flags; 91 92 spin_lock_irqsave(&prom_lock, flags); 93 switch(prom_vers) { 94 case PROM_V0: 95 case PROM_V2: 96 default: 97 ret = -1; 98 break; 99 case PROM_V3: 100 ret = (*(romvec->v3_cpuresume))(cpunode); 101 break; 102 }; 103 restore_current(); 104 spin_unlock_irqrestore(&prom_lock, flags); 105 106 return ret; 107} 108