mp.c

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/*
 * 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 ([email protected])
 */

#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;
}