LXR linux/arch/sparc/prom/mp.c

   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
  15extern 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 */
  22int
  23prom_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