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/*
* Author: Kumar Gala <galak@kernel.crashing.org>
*
* Copyright 2009 Freescale Semiconductor Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <asm/dbell.h>
#ifdef CONFIG_SMP
unsigned long dbell_smp_message[NR_CPUS];
void smp_dbell_message_pass(int target, int msg)
{
int i;
if(target < NR_CPUS) {
set_bit(msg, &dbell_smp_message[target]);
ppc_msgsnd(PPC_DBELL, 0, target);
}
else if(target == MSG_ALL_BUT_SELF) {
for_each_online_cpu(i) {
if (i == smp_processor_id())
continue;
set_bit(msg, &dbell_smp_message[i]);
ppc_msgsnd(PPC_DBELL, 0, i);
}
}
else { /* target == MSG_ALL */
for_each_online_cpu(i)
set_bit(msg, &dbell_smp_message[i]);
ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0);
}
}
void doorbell_exception(struct pt_regs *regs)
{
int cpu = smp_processor_id();
int msg;
if (num_online_cpus() < 2)
return;
for (msg = 0; msg < 4; msg++)
if (test_and_clear_bit(msg, &dbell_smp_message[cpu]))
smp_message_recv(msg);
}
#else /* CONFIG_SMP */
void doorbell_exception(struct pt_regs *regs)
{
printk(KERN_WARNING "Received doorbell on non-smp system\n");
}
#endif /* CONFIG_SMP */
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