cpu.c
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2009 Wind River Systems,
* written by Ralf Baechle <ralf@linux-mips.org>
*/
#include <linux/init.h>
#include <linux/irqflags.h>
#include <linux/notifier.h>
#include <linux/prefetch.h>
#include <linux/sched.h>
#include <asm/cop2.h>
#include <asm/current.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/octeon/octeon.h>
static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
void *data)
{
unsigned long flags;
unsigned int status;
switch (action) {
case CU2_EXCEPTION:
prefetch(¤t->thread.cp2);
local_irq_save(flags);
KSTK_STATUS(current) |= ST0_CU2;
status = read_c0_status();
write_c0_status(status | ST0_CU2);
octeon_cop2_restore(&(current->thread.cp2));
write_c0_status(status & ~ST0_CU2);
local_irq_restore(flags);
return NOTIFY_BAD; /* Don't call default notifier */
}
return NOTIFY_OK; /* Let default notifier send signals */
}
static int __init cnmips_cu2_setup(void)
{
return cu2_notifier(cnmips_cu2_call, 0);
}
early_initcall(cnmips_cu2_setup);