linux/arch/arm/mach-iop32x/cp6.c
Arnd Bergmann a1f487d75c ARM: iop32x: merge everything into mach-iop32x/
Various bits of iop32x are now in their traditional locations in plat-iop,
mach-iop/include/mach/ and in include/asm/mach/hardware. As nothing
outside of the iop32x mach code references these any more, this can all
be moved into one place now.

The only remaining things in the include/mach/ directory are now the
NR_IRQS definition, the entry-macros.S file and the the decompressor
uart access. After the irqchip code has been converted to SPARSE_IRQ
and GENERIC_IRQ_MULTI_HANDLER, it can be moved to ARCH_MULTIPLATFORM.

Link: https://lore.kernel.org/r/20190809163334.489360-7-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2019-08-14 15:36:22 +02:00

39 lines
797 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>
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);
}