xref: /linux/arch/sparc/prom/mp.c (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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
prom_startcpu(int cpunode,struct linux_prom_registers * ctable_reg,int ctx,char * pc)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