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/* $Id: mp.c,v 1.9 1997/05/14 20:45:01 davem Exp $
* mp.c: OpenBoot Prom Multiprocessor support routines. Don't call
* these on a UP or else you will halt and catch fire. ;)
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
/* XXX Let's get rid of this thing if we can... */
extern struct task_struct *current_set[NR_CPUS];
/* Start cpu with prom-tree node 'cpunode' using context described
* by 'ctable_reg' in context 'ctx' at program counter 'pc'.
*
* XXX Have to look into what the return values mean. XXX
*/
int
prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
{
int ret;
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
case PROM_AP1000:
default:
ret = -1;
break;
case PROM_V3:
ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return ret;
}
/* Stop CPU with device prom-tree node 'cpunode'.
* XXX Again, what does the return value really mean? XXX
*/
int
prom_stopcpu(int cpunode)
{
int ret;
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
case PROM_AP1000:
default:
ret = -1;
break;
case PROM_V3:
ret = (*(romvec->v3_cpustop))(cpunode);
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return ret;
}
/* Make CPU with device prom-tree node 'cpunode' idle.
* XXX Return value, anyone? XXX
*/
int
prom_idlecpu(int cpunode)
{
int ret;
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
case PROM_AP1000:
default:
ret = -1;
break;
case PROM_V3:
ret = (*(romvec->v3_cpuidle))(cpunode);
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return ret;
}
/* Resume the execution of CPU with nodeid 'cpunode'.
* XXX Come on, somebody has to know... XXX
*/
int
prom_restartcpu(int cpunode)
{
int ret;
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
case PROM_V2:
case PROM_AP1000:
default:
ret = -1;
break;
case PROM_V3:
ret = (*(romvec->v3_cpuresume))(cpunode);
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return ret;
}
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