[linux-block.git] / arch / arm64 / include / asm / virt.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 */

#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.
 */
#define HVC_SET_VECTORS 0

/*
 * HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
 */
#define HVC_SOFT_RESTART 1

/*
 * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
 */
#define HVC_RESET_VECTORS 2

/* Max number of HYP stub hypercalls */
#define HVC_STUB_HCALL_NR 3

/* 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 */
Commit	Line	Data
caab277b	1	/* SPDX-License-Identifier: GPL-2.0-only */
f35a9205 MZ	2	/*
	3	* Copyright (C) 2012 ARM Ltd.
	4	* Author: Marc Zyngier <marc.zyngier@arm.com>
f35a9205 MZ	5	*/
	6
	7	#ifndef __ASM__VIRT_H
	8	#define __ASM__VIRT_H
	9
ad72e59f	10	/*
810c86ee MZ	11	* The arm64 hcall implementation uses x0 to specify the hcall
	12	* number. A value less than HVC_STUB_HCALL_NR indicates a special
	13	* hcall, such as set vector. Any other value is handled in a
	14	* hypervisor specific way.
	15	*
	16	* The hypercall is allowed to clobber any of the caller-saved
	17	* registers (x0-x18), so it is advisable to use it through the
	18	* indirection of a function call (as implemented in hyp-stub.S).
ad72e59f GL	19	*/
ad72e59f GL	20
ad72e59f GL	21	/*
	22	* HVC_SET_VECTORS - Set the value of the vbar_el2 register.
	23	*
	24	* @x1: Physical address of the new vector table.
	25	*/
0b51c547	26	#define HVC_SET_VECTORS 0
ad72e59f	27
f9076ecf GL	28	/*
	29	* HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
	30	*/
0b51c547	31	#define HVC_SOFT_RESTART 1
f9076ecf	32
fd0e0c61 MZ	33	/*
	34	* HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
	35	*/
0b51c547	36	#define HVC_RESET_VECTORS 2
fd0e0c61 MZ	37
fd0e0c61 MZ	38	/* Max number of HYP stub hypercalls */
0b51c547	39	#define HVC_STUB_HCALL_NR 3
fd0e0c61	40
4993fdcf MZ	41	/* Error returned when an invalid stub number is passed into x0 */
	42	#define HVC_STUB_ERR 0xbadca11
	43
828e9834 ML	44	#define BOOT_CPU_MODE_EL1 (0xe11)
828e9834 ML	45	#define BOOT_CPU_MODE_EL2 (0xe12)
f35a9205 MZ	46
	47	#ifndef __ASSEMBLY__
	48
82deae0f	49	#include <asm/ptrace.h>
ee78fdc7	50	#include <asm/sections.h>
1f3d8699	51	#include <asm/sysreg.h>
488f94d7	52	#include <asm/cpufeature.h>
82deae0f	53
f35a9205 MZ	54	/*
	55	* __boot_cpu_mode records what mode CPUs were booted in.
	56	* A correctly-implemented bootloader must start all CPUs in the same mode:
	57	* In this case, both 32bit halves of __boot_cpu_mode will contain the
	58	* same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
	59	*
	60	* Should the bootloader fail to do this, the two values will be different.
	61	* This allows the kernel to flag an error when the secondaries have come up.
	62	*/
	63	extern u32 __boot_cpu_mode[2];
	64
712c6ff4	65	void __hyp_set_vectors(phys_addr_t phys_vector_base);
fd0e0c61	66	void __hyp_reset_vectors(void);
712c6ff4	67
f35a9205 MZ	68	/* Reports the availability of HYP mode */
	69	static inline bool is_hyp_mode_available(void)
	70	{
	71	return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
	72	__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
	73	}
	74
	75	/* Check if the bootloader has booted CPUs in different modes */
	76	static inline bool is_hyp_mode_mismatched(void)
	77	{
	78	return __boot_cpu_mode[0] != __boot_cpu_mode[1];
	79	}
	80
82deae0f MZ	81	static inline bool is_kernel_in_hyp_mode(void)
82deae0f MZ	82	{
1f3d8699	83	return read_sysreg(CurrentEL) == CurrentEL_EL2;
82deae0f MZ	84	}
82deae0f MZ	85
5c37f1ae	86	static __always_inline bool has_vhe(void)
488f94d7 JL	87	{
	88	if (cpus_have_const_cap(ARM64_HAS_VIRT_HOST_EXTN))
	89	return true;
	90
	91	return false;
	92	}
	93
f35a9205 MZ	94	#endif /* __ASSEMBLY__ */
	95
	96	#endif /* ! __ASM__VIRT_H */