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
prom_startcpu(int cpunode,struct linux_prom_registers * ctable_reg,int ctx,char * pc)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