cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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secure_cntvoff.S (825B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2014 Renesas Electronics Corporation
      4 *
      5 * Initialization of CNTVOFF register from secure mode
      6 *
      7 */
      8
      9#include <linux/linkage.h>
     10#include <asm/assembler.h>
     11
     12ENTRY(secure_cntvoff_init)
     13	.arch	armv7-a
     14	/*
     15	 * CNTVOFF has to be initialized either from non-secure Hypervisor
     16	 * mode or secure Monitor mode with SCR.NS==1. If TrustZone is enabled
     17	 * then it should be handled by the secure code. The CPU must implement
     18	 * the virtualization extensions.
     19	 */
     20	cps	#MON_MODE
     21	mrc	p15, 0, r1, c1, c1, 0		/* Get Secure Config */
     22	orr	r0, r1, #1
     23	mcr	p15, 0, r0, c1, c1, 0		/* Set Non Secure bit */
     24	isb
     25	mov	r0, #0
     26	mcrr	p15, 4, r0, r0, c14		/* CNTVOFF = 0 */
     27	isb
     28	mcr	p15, 0, r1, c1, c1, 0		/* Set Secure bit */
     29	isb
     30	cps	#SVC_MODE
     31	ret	lr
     32ENDPROC(secure_cntvoff_init)