satip-axe/kernel/arch/sparc/prom/mp.c
2015-03-26 17:24:57 +01:00

122 lines
2.3 KiB
C

/*
* 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;
}