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       1                 :            : /*
       2                 :            :  * Copyright (c) 2012 Linaro Limited.
       3                 :            :  *
       4                 :            :  * This program is free software; you can redistribute it and/or modify
       5                 :            :  * it under the terms of the GNU General Public License as published by
       6                 :            :  * the Free Software Foundation; either version 2 of the License, or
       7                 :            :  * (at your option) any later version.
       8                 :            :  *
       9                 :            :  * This program is distributed in the hope that it will be useful,
      10                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12                 :            :  * GNU General Public License for more details.
      13                 :            :  *
      14                 :            :  * You should have received a copy of the GNU General Public License along
      15                 :            :  * with this program; if not, write to the Free Software Foundation, Inc.,
      16                 :            :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      17                 :            :  */
      18                 :            : 
      19                 :            : #ifndef VIRT_H
      20                 :            : #define VIRT_H
      21                 :            : 
      22                 :            : #include <asm/ptrace.h>
      23                 :            : 
      24                 :            : /*
      25                 :            :  * Flag indicating that the kernel was not entered in the same mode on every
      26                 :            :  * CPU.  The zImage loader stashes this value in an SPSR, so we need an
      27                 :            :  * architecturally defined flag bit here.
      28                 :            :  */
      29                 :            : #define BOOT_CPU_MODE_MISMATCH  PSR_N_BIT
      30                 :            : 
      31                 :            : #ifndef __ASSEMBLY__
      32                 :            : #include <asm/cacheflush.h>
      33                 :            : 
      34                 :            : #ifdef CONFIG_ARM_VIRT_EXT
      35                 :            : /*
      36                 :            :  * __boot_cpu_mode records what mode the primary CPU was booted in.
      37                 :            :  * A correctly-implemented bootloader must start all CPUs in the same mode:
      38                 :            :  * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate
      39                 :            :  * that some CPU(s) were booted in a different mode.
      40                 :            :  *
      41                 :            :  * This allows the kernel to flag an error when the secondaries have come up.
      42                 :            :  */
      43                 :            : extern int __boot_cpu_mode;
      44                 :            : 
      45                 :            : static inline void sync_boot_mode(void)
      46                 :            : {
      47                 :            :         /*
      48                 :            :          * As secondaries write to __boot_cpu_mode with caches disabled, we
      49                 :            :          * must flush the corresponding cache entries to ensure the visibility
      50                 :            :          * of their writes.
      51                 :            :          */
      52                 :            :         sync_cache_r(&__boot_cpu_mode);
      53                 :            : }
      54                 :            : 
      55                 :            : void __hyp_set_vectors(unsigned long phys_vector_base);
      56                 :            : unsigned long __hyp_get_vectors(void);
      57                 :            : #else
      58                 :            : #define __boot_cpu_mode (SVC_MODE)
      59                 :            : #define sync_boot_mode()
      60                 :            : #endif
      61                 :            : 
      62                 :            : #ifndef ZIMAGE
      63                 :            : void hyp_mode_check(void);
      64                 :            : 
      65                 :            : /* Reports the availability of HYP mode */
      66                 :            : static inline bool is_hyp_mode_available(void)
      67                 :            : {
      68 [ #  # ][ #  # ]:          0 :         return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE &&
      69                 :            :                 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH));
      70                 :            : }
      71                 :            : 
      72                 :            : /* Check if the bootloader has booted CPUs in different modes */
      73                 :            : static inline bool is_hyp_mode_mismatched(void)
      74                 :            : {
      75                 :            :         return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
      76                 :            : }
      77                 :            : #endif
      78                 :            : 
      79                 :            : #endif /* __ASSEMBLY__ */
      80                 :            : 
      81                 :            : #endif /* ! VIRT_H */