2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2009 Wind River Systems,
7 * written by Ralf Baechle <ralf@linux-mips.org>
9 #include <linux/init.h>
10 #include <linux/irqflags.h>
11 #include <linux/notifier.h>
12 #include <linux/prefetch.h>
13 #include <linux/sched.h>
16 #include <asm/current.h>
17 #include <asm/mipsregs.h>
19 #include <asm/octeon/octeon.h>
21 static int cnmips_cu2_call(struct notifier_block
*nfb
, unsigned long action
,
29 prefetch(¤t
->thread
.cp2
);
30 local_irq_save(flags
);
31 KSTK_STATUS(current
) |= ST0_CU2
;
32 status
= read_c0_status();
33 write_c0_status(status
| ST0_CU2
);
34 octeon_cop2_restore(&(current
->thread
.cp2
));
35 write_c0_status(status
& ~ST0_CU2
);
36 local_irq_restore(flags
);
38 return NOTIFY_BAD
; /* Don't call default notifier */
41 return NOTIFY_OK
; /* Let default notifier send signals */
44 static struct notifier_block cnmips_cu2_notifier
= {
45 .notifier_call
= cnmips_cu2_call
,
48 static int cnmips_cu2_setup(void)
50 return register_cu2_notifier(&cnmips_cu2_notifier
);
52 early_initcall(cnmips_cu2_setup
);