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 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/*
22 * The arm64 hcall implementation uses x0 to specify the hcall type. A value
23 * less than 0xfff indicates a special hcall, such as get/set vector.
24 * Any other value is used as a pointer to the function to call.
25 */
26
27/* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
28#define HVC_GET_VECTORS 0
29
30/*
31 * HVC_SET_VECTORS - Set the value of the vbar_el2 register.
32 *
33 * @x1: Physical address of the new vector table.
34 */
35#define HVC_SET_VECTORS 1
36
37/*
38 * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
39 */
40#define HVC_SOFT_RESTART 2
41
42#define BOOT_CPU_MODE_EL1 (0xe11)
43#define BOOT_CPU_MODE_EL2 (0xe12)
44
45#ifndef __ASSEMBLY__
46
47#include <asm/ptrace.h>
48#include <asm/sections.h>
49#include <asm/sysreg.h>
50#include <asm/cpufeature.h>
51
52/*
53 * __boot_cpu_mode records what mode CPUs were booted in.
54 * A correctly-implemented bootloader must start all CPUs in the same mode:
55 * In this case, both 32bit halves of __boot_cpu_mode will contain the
56 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
57 *
58 * Should the bootloader fail to do this, the two values will be different.
59 * This allows the kernel to flag an error when the secondaries have come up.
60 */
61extern u32 __boot_cpu_mode[2];
62
63void __hyp_set_vectors(phys_addr_t phys_vector_base);
64phys_addr_t __hyp_get_vectors(void);
65
66/* Reports the availability of HYP mode */
67static inline bool is_hyp_mode_available(void)
68{
69 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
70 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
71}
72
73/* Check if the bootloader has booted CPUs in different modes */
74static inline bool is_hyp_mode_mismatched(void)
75{
76 return __boot_cpu_mode[0] != __boot_cpu_mode[1];
77}
78
79static inline bool is_kernel_in_hyp_mode(void)
80{
81 return read_sysreg(CurrentEL) == CurrentEL_EL2;
82}
83
84static inline bool has_vhe(void)
85{
86 if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN))
87 return true;
88
89 return false;
90}
91
92#ifdef CONFIG_ARM64_VHE
93extern void verify_cpu_run_el(void);
94#else
95static inline void verify_cpu_run_el(void) {}
96#endif
97
98#endif /* __ASSEMBLY__ */
99
100#endif /* ! __ASM__VIRT_H */