Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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 (the N flag, as it happens)
28 */
29#define BOOT_CPU_MODE_MISMATCH (1<<31)
30
31#ifndef __ASSEMBLY__
32
33#ifdef CONFIG_ARM_VIRT_EXT
34/*
35 * __boot_cpu_mode records what mode the primary CPU was booted in.
36 * A correctly-implemented bootloader must start all CPUs in the same mode:
37 * if it fails to do this, the flag BOOT_CPU_MODE_MISMATCH is set to indicate
38 * that some CPU(s) were booted in a different mode.
39 *
40 * This allows the kernel to flag an error when the secondaries have come up.
41 */
42extern int __boot_cpu_mode;
43
44void __hyp_set_vectors(unsigned long phys_vector_base);
45unsigned long __hyp_get_vectors(void);
46#else
47#define __boot_cpu_mode (SVC_MODE)
48#endif
49
50#ifndef ZIMAGE
51void hyp_mode_check(void);
52
53/* Reports the availability of HYP mode */
54static inline bool is_hyp_mode_available(void)
55{
56 return ((__boot_cpu_mode & MODE_MASK) == HYP_MODE &&
57 !(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH));
58}
59
60/* Check if the bootloader has booted CPUs in different modes */
61static inline bool is_hyp_mode_mismatched(void)
62{
63 return !!(__boot_cpu_mode & BOOT_CPU_MODE_MISMATCH);
64}
65#endif
66
67#endif /* __ASSEMBLY__ */
68
69#endif /* ! VIRT_H */