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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>
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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