mp.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:2k
- /* $Id: mp.c,v 1.12 2000/08/26 02:38:03 anton Exp $
- * 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;
- }
- /* Stop CPU with device prom-tree node 'cpunode'.
- * XXX Again, what does the return value really mean? XXX
- */
- int
- prom_stopcpu(int cpunode)
- {
- 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_cpustop))(cpunode);
- break;
- };
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
- }
- /* Make CPU with device prom-tree node 'cpunode' idle.
- * XXX Return value, anyone? XXX
- */
- int
- prom_idlecpu(int cpunode)
- {
- 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_cpuidle))(cpunode);
- break;
- };
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
- }
- /* Resume the execution of CPU with nodeid 'cpunode'.
- * XXX Come on, somebody has to know... XXX
- */
- int
- prom_restartcpu(int cpunode)
- {
- 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_cpuresume))(cpunode);
- break;
- };
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
- }