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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/kernel/cpu-reset.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * CPU reset routines

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 *

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 * Copyright (C) 2001 Deep Blue Solutions Ltd.

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 * Copyright (C) 2012 ARM Ltd.

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 * Copyright (C) 2015 Huawei Futurewei Technologies.

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 */

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#include <linux/linkage.h>

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#include <linux/cfi_types.h>

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#include <asm/assembler.h>

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#include <asm/sysreg.h>

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#include <asm/virt.h>

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.text

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.pushsection    .idmap.text, "a"

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/*

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 * cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2)

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 *

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 * @el2_switch: Flag to indicate a switch to EL2 is needed.

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 * @entry: Location to jump to for soft reset.

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 * arg0: First argument passed to @entry. (relocation list)

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 * arg1: Second argument passed to @entry.(physical kernel entry)

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 * arg2: Third argument passed to @entry. (physical dtb address)

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 *

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 * Put the CPU into the same state as it would be if it had been reset, and

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 * branch to what would be the reset vector. It must be executed with the

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 * flat identity mapping.

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 */

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SYM_TYPED_FUNC_START(cpu_soft_restart)

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	mov_q	x12, INIT_SCTLR_EL1_MMU_OFF

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	pre_disable_mmu_workaround

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	/*

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	 * either disable EL1&0 translation regime or disable EL2&0 translation

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	 * regime if HCR_EL2.E2H == 1

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	 */

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	msr	sctlr_el1, x12

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	isb

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	cbz	x0, 1f				// el2_switch?

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	mov	x0, #HVC_SOFT_RESTART

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	hvc	#0				// no return

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1:	mov	x8, x1				// entry

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	mov	x0, x2				// arg0

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	mov	x1, x3				// arg1

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	mov	x2, x4				// arg2

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	br	x8

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SYM_FUNC_END(cpu_soft_restart)

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.popsection

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