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
  15 extern 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  */
  22 int
  23 prom_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 }