1 /*
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/ptrace.h>
14 #include <linux/sched.h>
15 #include <linux/sched/task_stack.h>
16
17 #include <asm/cop2.h>
18 #include <asm/current.h>
19 #include <asm/mipsregs.h>
20 #include <asm/page.h>
21 #include <asm/octeon/octeon.h>
22
23 static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
24 void *data)
25 {
26 unsigned long flags;
27 unsigned int status;
28
29 switch (action) {
30 case CU2_EXCEPTION:
31 prefetch(¤t->thread.cp2);
32 local_irq_save(flags);
33 KSTK_STATUS(current) |= ST0_CU2;
34 status = read_c0_status();
35 write_c0_status(status | ST0_CU2);
36 octeon_cop2_restore(&(current->thread.cp2));
37 write_c0_status(status & ~ST0_CU2);
38 local_irq_restore(flags);
39
40 return NOTIFY_BAD; /* Don't call default notifier */
41 }
42
43 return NOTIFY_OK; /* Let default notifier send signals */
44 }
45
46 static int __init cnmips_cu2_setup(void)
47 {
48 return cu2_notifier(cnmips_cu2_call, 0);
49 }
50 early_initcall(cnmips_cu2_setup);
51
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