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 */