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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * mp.c:  OpenBoot Prom Multiprocessor support routines.  Don't call
   4 *        these on a UP or else you will halt and catch fire. ;)
   5 *
   6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7 */
   8
   9#include <linux/types.h>
  10#include <linux/kernel.h>
  11#include <linux/sched.h>
  12
  13#include <asm/openprom.h>
  14#include <asm/oplib.h>
  15
  16extern void restore_current(void);
  17
  18/* Start cpu with prom-tree node 'cpunode' using context described
  19 * by 'ctable_reg' in context 'ctx' at program counter 'pc'.
  20 *
  21 * XXX Have to look into what the return values mean. XXX
  22 */
  23int
  24prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
  25{
  26        int ret;
  27        unsigned long flags;
  28
  29        spin_lock_irqsave(&prom_lock, flags);
  30        switch(prom_vers) {
  31        case PROM_V0:
  32        case PROM_V2:
  33        default:
  34                ret = -1;
  35                break;
  36        case PROM_V3:
  37                ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
  38                break;
  39        }
  40        restore_current();
  41        spin_unlock_irqrestore(&prom_lock, flags);
  42
  43        return ret;
  44}
  45