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

 
 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);
56unsigned 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
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
83/* The section containing the hypervisor text */
84extern char __hyp_text_start[];
85extern char __hyp_text_end[];
86#endif
87
 
 
 
 
 
 
 
88#endif /* __ASSEMBLY__ */
 
 
89
90#endif /* ! VIRT_H */