1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * IOP Coprocessor-6 access handler
4*4882a593Smuzhiyun * Copyright (c) 2006, Intel Corporation.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun #include <linux/init.h>
7*4882a593Smuzhiyun #include <asm/traps.h>
8*4882a593Smuzhiyun #include <asm/ptrace.h>
9*4882a593Smuzhiyun
cp6_trap(struct pt_regs * regs,unsigned int instr)10*4882a593Smuzhiyun static int cp6_trap(struct pt_regs *regs, unsigned int instr)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun u32 temp;
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /* enable cp6 access */
15*4882a593Smuzhiyun asm volatile (
16*4882a593Smuzhiyun "mrc p15, 0, %0, c15, c1, 0\n\t"
17*4882a593Smuzhiyun "orr %0, %0, #(1 << 6)\n\t"
18*4882a593Smuzhiyun "mcr p15, 0, %0, c15, c1, 0\n\t"
19*4882a593Smuzhiyun : "=r"(temp));
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun return 0;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun /* permit kernel space cp6 access
25*4882a593Smuzhiyun * deny user space cp6 access
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun static struct undef_hook cp6_hook = {
28*4882a593Smuzhiyun .instr_mask = 0x0f000ff0,
29*4882a593Smuzhiyun .instr_val = 0x0e000610,
30*4882a593Smuzhiyun .cpsr_mask = MODE_MASK,
31*4882a593Smuzhiyun .cpsr_val = SVC_MODE,
32*4882a593Smuzhiyun .fn = cp6_trap,
33*4882a593Smuzhiyun };
34*4882a593Smuzhiyun
iop_init_cp6_handler(void)35*4882a593Smuzhiyun void __init iop_init_cp6_handler(void)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun register_undef_hook(&cp6_hook);
38*4882a593Smuzhiyun }
39