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38 lines
797 B
38 lines
797 B
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IOP Coprocessor-6 access handler |
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* Copyright (c) 2006, Intel Corporation. |
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*/ |
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#include <linux/init.h> |
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#include <asm/traps.h> |
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#include <asm/ptrace.h> |
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static int cp6_trap(struct pt_regs *regs, unsigned int instr) |
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{ |
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u32 temp; |
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/* enable cp6 access */ |
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asm volatile ( |
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"mrc p15, 0, %0, c15, c1, 0\n\t" |
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"orr %0, %0, #(1 << 6)\n\t" |
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"mcr p15, 0, %0, c15, c1, 0\n\t" |
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: "=r"(temp)); |
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return 0; |
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} |
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/* permit kernel space cp6 access |
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* deny user space cp6 access |
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*/ |
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static struct undef_hook cp6_hook = { |
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.instr_mask = 0x0f000ff0, |
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.instr_val = 0x0e000610, |
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.cpsr_mask = MODE_MASK, |
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.cpsr_val = SVC_MODE, |
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.fn = cp6_trap, |
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}; |
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void __init iop_init_cp6_handler(void) |
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{ |
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register_undef_hook(&cp6_hook); |
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}
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