LXR linux/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 */
  43extern int __boot_cpu_mode;
  44
  45static 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
  55void __hyp_set_vectors(unsigned long phys_vector_base);
  56void __hyp_reset_vectors(void);
  57#else
  58#define __boot_cpu_mode (SVC_MODE)
  59#define sync_boot_mode()
  60#endif
  61
  62#ifndef ZIMAGE
  63void hyp_mode_check(void);
  64
  65/* Reports the availability of HYP mode */
  66static 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 */
  73static inline bool is_hyp_mode_mismatched(void)
  74{
  75        return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
  76}
  77
  78static inline bool is_kernel_in_hyp_mode(void)
  79{
  80        return false;
  81}
  82
  83static inline bool has_vhe(void)
  84{
  85        return false;
  86}
  87
  88/* The section containing the hypervisor idmap text */
  89extern char __hyp_idmap_text_start[];
  90extern char __hyp_idmap_text_end[];
  91
  92/* The section containing the hypervisor text */
  93extern char __hyp_text_start[];
  94extern 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 */
 112