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122 lines
2.3 KiB
122 lines
2.3 KiB
20 years ago
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/* $Id: mp.c,v 1.12 2000/08/26 02:38:03 anton Exp $
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* mp.c: OpenBoot Prom Multiprocessor support routines. Don't call
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* these on a UP or else you will halt and catch fire. ;)
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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extern void restore_current(void);
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/* Start cpu with prom-tree node 'cpunode' using context described
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* by 'ctable_reg' in context 'ctx' at program counter 'pc'.
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*
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* XXX Have to look into what the return values mean. XXX
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*/
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int
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prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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case PROM_V2:
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default:
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ret = -1;
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break;
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case PROM_V3:
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ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return ret;
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}
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/* Stop CPU with device prom-tree node 'cpunode'.
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* XXX Again, what does the return value really mean? XXX
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*/
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int
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prom_stopcpu(int cpunode)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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case PROM_V2:
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default:
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ret = -1;
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break;
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case PROM_V3:
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ret = (*(romvec->v3_cpustop))(cpunode);
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return ret;
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}
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/* Make CPU with device prom-tree node 'cpunode' idle.
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* XXX Return value, anyone? XXX
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*/
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int
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prom_idlecpu(int cpunode)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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case PROM_V2:
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default:
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ret = -1;
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break;
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case PROM_V3:
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ret = (*(romvec->v3_cpuidle))(cpunode);
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return ret;
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}
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/* Resume the execution of CPU with nodeid 'cpunode'.
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* XXX Come on, somebody has to know... XXX
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*/
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int
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prom_restartcpu(int cpunode)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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case PROM_V2:
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default:
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ret = -1;
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break;
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case PROM_V3:
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ret = (*(romvec->v3_cpuresume))(cpunode);
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return ret;
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}
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