122 lines
2.3 KiB
C
122 lines
2.3 KiB
C
/* $Id: mp.c,v 1.12 2000/08/26 02:38:03 anton 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>
|
|
|
|
extern void restore_current(void);
|
|
|
|
/* 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;
|
|
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
switch(prom_vers) {
|
|
case PROM_V0:
|
|
case PROM_V2:
|
|
default:
|
|
ret = -1;
|
|
break;
|
|
case PROM_V3:
|
|
ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
|
|
break;
|
|
};
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, 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;
|
|
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
switch(prom_vers) {
|
|
case PROM_V0:
|
|
case PROM_V2:
|
|
default:
|
|
ret = -1;
|
|
break;
|
|
case PROM_V3:
|
|
ret = (*(romvec->v3_cpustop))(cpunode);
|
|
break;
|
|
};
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, 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;
|
|
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
switch(prom_vers) {
|
|
case PROM_V0:
|
|
case PROM_V2:
|
|
default:
|
|
ret = -1;
|
|
break;
|
|
case PROM_V3:
|
|
ret = (*(romvec->v3_cpuidle))(cpunode);
|
|
break;
|
|
};
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, 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;
|
|
|
|
spin_lock_irqsave(&prom_lock, flags);
|
|
switch(prom_vers) {
|
|
case PROM_V0:
|
|
case PROM_V2:
|
|
default:
|
|
ret = -1;
|
|
break;
|
|
case PROM_V3:
|
|
ret = (*(romvec->v3_cpuresume))(cpunode);
|
|
break;
|
|
};
|
|
restore_current();
|
|
spin_unlock_irqrestore(&prom_lock, flags);
|
|
|
|
return ret;
|
|
}
|