arch/arm/include/asm/virt.h

   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  */
  30 extern int __boot_cpu_mode;
  31
  32 static 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
  48 void hyp_mode_check(void);
  49
  50 /* Reports the availability of HYP mode */
  51 static 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 */
  58 static inline bool is_hyp_mode_mismatched(void)
  59 {
  60         return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
  61 }
  62
  63 static 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 */