cp6.c
1.39 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
/*
* IOP Coprocessor-6 access handler
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
*/
#include <linux/init.h>
#include <asm/traps.h>
#include <asm/ptrace.h>
static int cp6_trap(struct pt_regs *regs, unsigned int instr)
{
u32 temp;
/* enable cp6 access */
asm volatile (
"mrc p15, 0, %0, c15, c1, 0\n\t"
"orr %0, %0, #(1 << 6)\n\t"
"mcr p15, 0, %0, c15, c1, 0\n\t"
: "=r"(temp));
return 0;
}
/* permit kernel space cp6 access
* deny user space cp6 access
*/
static struct undef_hook cp6_hook = {
.instr_mask = 0x0f000ff0,
.instr_val = 0x0e000610,
.cpsr_mask = MODE_MASK,
.cpsr_val = SVC_MODE,
.fn = cp6_trap,
};
void __init iop_init_cp6_handler(void)
{
register_undef_hook(&cp6_hook);
}