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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * IOP Coprocessor-6 access handler
- * Copyright (c) 2006, Intel Corporation.
- */
- #include <linux/init.h>
- #include <asm/traps.h>
- #include <asm/ptrace.h>
- #include "iop3xx.h"
- void iop_enable_cp6(void)
- {
- 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"
- "mrc p15, 0, %0, c15, c1, 0\n\t"
- "mov %0, %0\n\t"
- "sub pc, pc, #4 @ cp_wait\n\t"
- : "=r"(temp));
- }
- static int cp6_trap(struct pt_regs *regs, unsigned int instr)
- {
- iop_enable_cp6();
- 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);
- }
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