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 }
45
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