blob: b6df5387e855d10ad1d483851f3f3d553ef1335c [file] [log] [blame]
Ralf Baechle69f3a7d2009-11-24 01:24:58 +00001/*
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
4 * for more details.
5 *
6 * Copyright (C) 2009 Wind River Systems,
7 * written by Ralf Baechle <ralf@linux-mips.org>
8 */
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>
14
15#include <asm/cop2.h>
16#include <asm/current.h>
17#include <asm/mipsregs.h>
18#include <asm/page.h>
19#include <asm/octeon/octeon.h>
20
21static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
22 void *data)
23{
24 unsigned long flags;
25 unsigned int status;
26
27 switch (action) {
28 case CU2_EXCEPTION:
29 prefetch(&current->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);
37
38 return NOTIFY_BAD; /* Don't call default notifier */
39 }
40
41 return NOTIFY_OK; /* Let default notifier send signals */
42}
43
44static struct notifier_block cnmips_cu2_notifier = {
45 .notifier_call = cnmips_cu2_call,
46};
47
48static int cnmips_cu2_setup(void)
49{
50 return register_cu2_notifier(&cnmips_cu2_notifier);
51}
52early_initcall(cnmips_cu2_setup);