Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (C) 2012 ARM Ltd.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
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
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef __ASM__VIRT_H
19#define __ASM__VIRT_H
20
21#define BOOT_CPU_MODE_EL2 (0x0e12b007)
22
23#ifndef __ASSEMBLY__
24#include <asm/cacheflush.h>
25
26/*
27 * __boot_cpu_mode records what mode CPUs were booted in.
28 * A correctly-implemented bootloader must start all CPUs in the same mode:
29 * In this case, both 32bit halves of __boot_cpu_mode will contain the
30 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
31 *
32 * Should the bootloader fail to do this, the two values will be different.
33 * This allows the kernel to flag an error when the secondaries have come up.
34 */
35extern u32 __boot_cpu_mode[2];
36
37void __hyp_set_vectors(phys_addr_t phys_vector_base);
38phys_addr_t __hyp_get_vectors(void);
39
40static inline void sync_boot_mode(void)
41{
42 /*
43 * As secondaries write to __boot_cpu_mode with caches disabled, we
44 * must flush the corresponding cache entries to ensure the visibility
45 * of their writes.
46 */
47 __flush_dcache_area(__boot_cpu_mode, sizeof(__boot_cpu_mode));
48}
49
50/* Reports the availability of HYP mode */
51static inline bool is_hyp_mode_available(void)
52{
53 sync_boot_mode();
54 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
55 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
56}
57
58/* Check if the bootloader has booted CPUs in different modes */
59static inline bool is_hyp_mode_mismatched(void)
60{
61 sync_boot_mode();
62 return __boot_cpu_mode[0] != __boot_cpu_mode[1];
63}
64
65#endif /* __ASSEMBLY__ */
66
67#endif /* ! __ASM__VIRT_H */