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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 2 | /* |
1da177e4 LT |
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; | |
6cb79b3f | 39 | } |
1da177e4 LT |
40 | restore_current(); |
41 | spin_unlock_irqrestore(&prom_lock, flags); | |
42 | ||
43 | return ret; | |
44 | } |