49 lines
956 B
C
49 lines
956 B
C
// 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);
|
|
}
|