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 }
  44
  45 /* Stop CPU with device prom-tree node 'cpunode'.
  46  * XXX Again, what does the return value really mean? XXX
  47  */
  48 int
  49 prom_stopcpu(int cpunode)
  50 {
  51         int ret;
  52         unsigned long flags;
  53
  54         spin_lock_irqsave(&prom_lock, flags);
  55         switch(prom_vers) {
  56         case PROM_V0:
  57         case PROM_V2:
  58         default:
  59                 ret = -1;
  60                 break;
  61         case PROM_V3:
  62                 ret = (*(romvec->v3_cpustop))(cpunode);
  63                 break;
  64         };
  65         restore_current();
  66         spin_unlock_irqrestore(&prom_lock, flags);
  67
  68         return ret;
  69 }
  70
  71 /* Make CPU with device prom-tree node 'cpunode' idle.
  72  * XXX Return value, anyone? XXX
  73  */
  74 int
  75 prom_idlecpu(int cpunode)
  76 {
  77         int ret;
  78         unsigned long flags;
  79
  80         spin_lock_irqsave(&prom_lock, flags);
  81         switch(prom_vers) {
  82         case PROM_V0:
  83         case PROM_V2:
  84         default:
  85                 ret = -1;
  86                 break;
  87         case PROM_V3:
  88                 ret = (*(romvec->v3_cpuidle))(cpunode);
  89                 break;
  90         };
  91         restore_current();
  92         spin_unlock_irqrestore(&prom_lock, flags);
  93
  94         return ret;
  95 }
  96
  97 /* Resume the execution of CPU with nodeid 'cpunode'.
  98  * XXX Come on, somebody has to know... XXX
  99  */
 100 int
 101 prom_restartcpu(int cpunode)
 102 {
 103         int ret;
 104         unsigned long flags;
 105
 106         spin_lock_irqsave(&prom_lock, flags);
 107         switch(prom_vers) {
 108         case PROM_V0:
 109         case PROM_V2:
 110         default:
 111                 ret = -1;
 112                 break;
 113         case PROM_V3:
 114                 ret = (*(romvec->v3_cpuresume))(cpunode);
 115                 break;
 116         };
 117         restore_current();
 118         spin_unlock_irqrestore(&prom_lock, flags);
 119
 120         return ret;
 121 }