| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * IOP Coprocessor-6 access handler |
| 3 | * Copyright (c) 2006, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 16 | * Place - Suite 330, Boston, MA 02111-1307 USA. |
| 17 | * |
| 18 | */ |
| 19 | #include <linux/init.h> |
| 20 | #include <asm/traps.h> |
| 21 | #include <asm/ptrace.h> |
| 22 | |
| 23 | static int cp6_trap(struct pt_regs *regs, unsigned int instr) |
| 24 | { |
| 25 | u32 temp; |
| 26 | |
| 27 | /* enable cp6 access */ |
| 28 | asm volatile ( |
| 29 | "mrc p15, 0, %0, c15, c1, 0\n\t" |
| 30 | "orr %0, %0, #(1 << 6)\n\t" |
| 31 | "mcr p15, 0, %0, c15, c1, 0\n\t" |
| 32 | : "=r"(temp)); |
| 33 | |
| 34 | return 0; |
| 35 | } |
| 36 | |
| 37 | /* permit kernel space cp6 access |
| 38 | * deny user space cp6 access |
| 39 | */ |
| 40 | static struct undef_hook cp6_hook = { |
| 41 | .instr_mask = 0x0f000ff0, |
| 42 | .instr_val = 0x0e000610, |
| 43 | .cpsr_mask = MODE_MASK, |
| 44 | .cpsr_val = SVC_MODE, |
| 45 | .fn = cp6_trap, |
| 46 | }; |
| 47 | |
| 48 | void __init iop_init_cp6_handler(void) |
| 49 | { |
| 50 | register_undef_hook(&cp6_hook); |
| 51 | } |