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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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33 lines
825 B
ArmAsm
33 lines
825 B
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2014 Renesas Electronics Corporation
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*
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* Initialization of CNTVOFF register from secure mode
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*
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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ENTRY(secure_cntvoff_init)
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.arch armv7-a
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/*
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* CNTVOFF has to be initialized either from non-secure Hypervisor
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* mode or secure Monitor mode with SCR.NS==1. If TrustZone is enabled
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* then it should be handled by the secure code. The CPU must implement
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* the virtualization extensions.
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*/
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cps #MON_MODE
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mrc p15, 0, r1, c1, c1, 0 /* Get Secure Config */
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orr r0, r1, #1
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mcr p15, 0, r0, c1, c1, 0 /* Set Non Secure bit */
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isb
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mov r0, #0
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mcrr p15, 4, r0, r0, c14 /* CNTVOFF = 0 */
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isb
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mcr p15, 0, r1, c1, c1, 0 /* Set Secure bit */
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isb
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cps #SVC_MODE
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ret lr
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ENDPROC(secure_cntvoff_init)
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