[linux-2.6-block.git] / arch / arm64 / include / asm / virt.h

/*
 * Copyright (C) 2012 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __ASM__VIRT_H
#define __ASM__VIRT_H

/*
 * The arm64 hcall implementation uses x0 to specify the hcall type. A value
 * less than 0xfff indicates a special hcall, such as get/set vector.
 * Any other value is used as a pointer to the function to call.
 */

/* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
#define HVC_GET_VECTORS 0

/*
 * HVC_SET_VECTORS - Set the value of the vbar_el2 register.
 *
 * @x1: Physical address of the new vector table.
 */
#define HVC_SET_VECTORS 1

#define BOOT_CPU_MODE_EL1	(0xe11)
#define BOOT_CPU_MODE_EL2	(0xe12)

#ifndef __ASSEMBLY__

#include <asm/ptrace.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);
phys_addr_t __hyp_get_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)
{
	u64 el;

	asm("mrs %0, CurrentEL" : "=r" (el));
	return el == CurrentEL_EL2;
}

#ifdef CONFIG_ARM64_VHE
extern void verify_cpu_run_el(void);
#else
static inline void verify_cpu_run_el(void) {}
#endif

/* The section containing the hypervisor text */
extern char __hyp_text_start[];
extern char __hyp_text_end[];

#endif /* __ASSEMBLY__ */

#endif /* ! __ASM__VIRT_H */
Commit	Line	Data
f35a9205 MZ	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
ad72e59f GL	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
828e9834 ML	37	#define BOOT_CPU_MODE_EL1 (0xe11)
828e9834 ML	38	#define BOOT_CPU_MODE_EL2 (0xe12)
f35a9205 MZ	39
	40	#ifndef __ASSEMBLY__
	41
82deae0f MZ	42	#include <asm/ptrace.h>
82deae0f MZ	43
f35a9205 MZ	44	/*
	45	* __boot_cpu_mode records what mode CPUs were booted in.
	46	* A correctly-implemented bootloader must start all CPUs in the same mode:
	47	* In this case, both 32bit halves of __boot_cpu_mode will contain the
	48	* same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
	49	*
	50	* Should the bootloader fail to do this, the two values will be different.
	51	* This allows the kernel to flag an error when the secondaries have come up.
	52	*/
	53	extern u32 __boot_cpu_mode[2];
	54
712c6ff4 MZ	55	void __hyp_set_vectors(phys_addr_t phys_vector_base);
	56	phys_addr_t __hyp_get_vectors(void);
	57
f35a9205 MZ	58	/* Reports the availability of HYP mode */
	59	static inline bool is_hyp_mode_available(void)
	60	{
	61	return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
	62	__boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
	63	}
	64
	65	/* Check if the bootloader has booted CPUs in different modes */
	66	static inline bool is_hyp_mode_mismatched(void)
	67	{
	68	return __boot_cpu_mode[0] != __boot_cpu_mode[1];
	69	}
	70
82deae0f MZ	71	static inline bool is_kernel_in_hyp_mode(void)
	72	{
	73	u64 el;
	74
	75	asm("mrs %0, CurrentEL" : "=r" (el));
	76	return el == CurrentEL_EL2;
	77	}
	78
ac1ad20f SP	79	#ifdef CONFIG_ARM64_VHE
	80	extern void verify_cpu_run_el(void);
	81	#else
	82	static inline void verify_cpu_run_el(void) {}
	83	#endif
	84
45451914 MZ	85	/* The section containing the hypervisor text */
	86	extern char __hyp_text_start[];
	87	extern char __hyp_text_end[];
	88
f35a9205 MZ	89	#endif /* __ASSEMBLY__ */
	90
	91	#endif /* ! __ASM__VIRT_H */