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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coresight-self-hosted-trace.h (686B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Arm v8 Self-Hosted trace support.
      4 *
      5 * Copyright (C) 2021 ARM Ltd.
      6 */
      7
      8#ifndef __CORESIGHT_SELF_HOSTED_TRACE_H
      9#define __CORESIGHT_SELF_HOSTED_TRACE_H
     10
     11#include <asm/sysreg.h>
     12
     13static inline u64 read_trfcr(void)
     14{
     15	return read_sysreg_s(SYS_TRFCR_EL1);
     16}
     17
     18static inline void write_trfcr(u64 val)
     19{
     20	write_sysreg_s(val, SYS_TRFCR_EL1);
     21	isb();
     22}
     23
     24static inline u64 cpu_prohibit_trace(void)
     25{
     26	u64 trfcr = read_trfcr();
     27
     28	/* Prohibit tracing at EL0 & the kernel EL */
     29	write_trfcr(trfcr & ~(TRFCR_ELx_ExTRE | TRFCR_ELx_E0TRE));
     30	/* Return the original value of the TRFCR */
     31	return trfcr;
     32}
     33#endif /*  __CORESIGHT_SELF_HOSTED_TRACE_H */