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
  16 extern 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  */
  23 int
  24 prom_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 }