arch/arm/include/asm/virt.h

   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 void __hyp_reset_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         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
  78 static inline bool is_kernel_in_hyp_mode(void)
  79 {
  80         return false;
  81 }
  82
  83 static inline bool has_vhe(void)
  84 {
  85         return false;
  86 }
  87
  88 /* The section containing the hypervisor idmap text */
  89 extern char __hyp_idmap_text_start[];
  90 extern char __hyp_idmap_text_end[];
  91
  92 /* The section containing the hypervisor text */
  93 extern char __hyp_text_start[];
  94 extern char __hyp_text_end[];
  95 #endif
  96
  97 #else
  98
  99 /* Only assembly code should need those */
 100
 101 #define HVC_SET_VECTORS 0
 102 #define HVC_SOFT_RESTART 1
 103 #define HVC_RESET_VECTORS 2
 104
 105 #define HVC_STUB_HCALL_NR 3
 106
 107 #endif /* __ASSEMBLY__ */
 108
 109 #define HVC_STUB_ERR    0xbadca11
 110
 111 #endif /* ! VIRT_H */