| /* |
| * 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); |
| } |
