2 * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call
3 * these on a UP or else you will halt and catch fire. ;)
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
12 #include <asm/openprom.h>
13 #include <asm/oplib.h>
15 extern void restore_current(void);
17 /* Start cpu with prom-tree node 'cpunode' using context described
18 * by 'ctable_reg' in context 'ctx' at program counter 'pc'.
20 * XXX Have to look into what the return values mean. XXX
23 prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
28 spin_lock_irqsave(&prom_lock, flags);
36 ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
40 spin_unlock_irqrestore(&prom_lock, flags);
45 /* Stop CPU with device prom-tree node 'cpunode'.
46 * XXX Again, what does the return value really mean? XXX
49 prom_stopcpu(int cpunode)
54 spin_lock_irqsave(&prom_lock, flags);
62 ret = (*(romvec->v3_cpustop))(cpunode);
66 spin_unlock_irqrestore(&prom_lock, flags);
71 /* Make CPU with device prom-tree node 'cpunode' idle.
72 * XXX Return value, anyone? XXX
75 prom_idlecpu(int cpunode)
80 spin_lock_irqsave(&prom_lock, flags);
88 ret = (*(romvec->v3_cpuidle))(cpunode);
92 spin_unlock_irqrestore(&prom_lock, flags);
97 /* Resume the execution of CPU with nodeid 'cpunode'.
98 * XXX Come on, somebody has to know... XXX
101 prom_restartcpu(int cpunode)
106 spin_lock_irqsave(&prom_lock, flags);
114 ret = (*(romvec->v3_cpuresume))(cpunode);
118 spin_unlock_irqrestore(&prom_lock, flags);