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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virt.h (1855B)


      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright (c) 2012 Linaro Limited.
      4 */
      5
      6#ifndef VIRT_H
      7#define VIRT_H
      8
      9#include <asm/ptrace.h>
     10
     11/*
     12 * Flag indicating that the kernel was not entered in the same mode on every
     13 * CPU.  The zImage loader stashes this value in an SPSR, so we need an
     14 * architecturally defined flag bit here.
     15 */
     16#define BOOT_CPU_MODE_MISMATCH	PSR_N_BIT
     17
     18#ifndef __ASSEMBLY__
     19#include <asm/cacheflush.h>
     20
     21#ifdef CONFIG_ARM_VIRT_EXT
     22/*
     23 * __boot_cpu_mode records what mode the primary CPU was booted in.
     24 * A correctly-implemented bootloader must start all CPUs in the same mode:
     25 * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate
     26 * that some CPU(s) were booted in a different mode.
     27 *
     28 * This allows the kernel to flag an error when the secondaries have come up.
     29 */
     30extern int __boot_cpu_mode;
     31
     32static inline void sync_boot_mode(void)
     33{
     34	/*
     35	 * As secondaries write to __boot_cpu_mode with caches disabled, we
     36	 * must flush the corresponding cache entries to ensure the visibility
     37	 * of their writes.
     38	 */
     39	sync_cache_r(&__boot_cpu_mode);
     40}
     41
     42#else
     43#define __boot_cpu_mode	(SVC_MODE)
     44#define sync_boot_mode()
     45#endif
     46
     47#ifndef ZIMAGE
     48void hyp_mode_check(void);
     49
     50/* Reports the availability of HYP mode */
     51static inline bool is_hyp_mode_available(void)
     52{
     53	return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE &&
     54		!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH));
     55}
     56
     57/* Check if the bootloader has booted CPUs in different modes */
     58static inline bool is_hyp_mode_mismatched(void)
     59{
     60	return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
     61}
     62
     63static inline bool is_kernel_in_hyp_mode(void)
     64{
     65	return false;
     66}
     67
     68#endif
     69
     70#else
     71
     72/* Only assembly code should need those */
     73
     74#define HVC_SET_VECTORS 0
     75#define HVC_SOFT_RESTART 1
     76
     77#endif /* __ASSEMBLY__ */
     78
     79#define HVC_STUB_ERR	0xbadca11
     80
     81#endif /* ! VIRT_H */