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/* SPDX-License-Identifier: GPL-2.0-only */
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <>
#ifndef __ASM__VIRT_H
#define __ASM__VIRT_H
* The arm64 hcall implementation uses x0 to specify the hcall
* number. A value less than HVC_STUB_HCALL_NR indicates a special
* hcall, such as set vector. Any other value is handled in a
* hypervisor specific way.
* The hypercall is allowed to clobber any of the caller-saved
* registers (x0-x18), so it is advisable to use it through the
* indirection of a function call (as implemented in hyp-stub.S).
* HVC_SET_VECTORS - Set the value of the vbar_el2 register.
* @x1: Physical address of the new vector table.
* HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
* HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
/* Max number of HYP stub hypercalls */
/* Error returned when an invalid stub number is passed into x0 */
#define HVC_STUB_ERR 0xbadca11
#define BOOT_CPU_MODE_EL1 (0xe11)
#define BOOT_CPU_MODE_EL2 (0xe12)
#ifndef __ASSEMBLY__
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/sysreg.h>
#include <asm/cpufeature.h>
* __boot_cpu_mode records what mode CPUs were booted in.
* A correctly-implemented bootloader must start all CPUs in the same mode:
* In this case, both 32bit halves of __boot_cpu_mode will contain the
* same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
* Should the bootloader fail to do this, the two values will be different.
* This allows the kernel to flag an error when the secondaries have come up.
extern u32 __boot_cpu_mode[2];
void __hyp_set_vectors(phys_addr_t phys_vector_base);
void __hyp_reset_vectors(void);
/* Reports the availability of HYP mode */
static inline bool is_hyp_mode_available(void)
return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
/* Check if the bootloader has booted CPUs in different modes */
static inline bool is_hyp_mode_mismatched(void)
return __boot_cpu_mode[0] != __boot_cpu_mode[1];
static inline bool is_kernel_in_hyp_mode(void)
return read_sysreg(CurrentEL) == CurrentEL_EL2;
static __always_inline bool has_vhe(void)
if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN))
return true;
return false;
#endif /* __ASSEMBLY__ */
#endif /* ! __ASM__VIRT_H */