[mirror_ubuntu-artful-kernel.git] / arch / arm64 / kvm / sys_regs.h

/*
 * Copyright (C) 2012,2013 - ARM Ltd
 * Author: Marc Zyngier <marc.zyngier@arm.com>
 *
 * Derived from arch/arm/kvm/coproc.h
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Authors: Christoffer Dall <c.dall@virtualopensystems.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 __ARM64_KVM_SYS_REGS_LOCAL_H__
#define __ARM64_KVM_SYS_REGS_LOCAL_H__

struct sys_reg_params {
	u8	Op0;
	u8	Op1;
	u8	CRn;
	u8	CRm;
	u8	Op2;
	u64	regval;
	bool	is_write;
	bool	is_aarch32;
	bool	is_32bit;	/* Only valid if is_aarch32 is true */
};

struct sys_reg_desc {
	/* MRS/MSR instruction which accesses it. */
	u8	Op0;
	u8	Op1;
	u8	CRn;
	u8	CRm;
	u8	Op2;

	/* Trapped access from guest, if non-NULL. */
	bool (*access)(struct kvm_vcpu *,
		       struct sys_reg_params *,
		       const struct sys_reg_desc *);

	/* Initialization for vcpu. */
	void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);

	/* Index into sys_reg[], or 0 if we don't need to save it. */
	int reg;

	/* Value (usually reset value) */
	u64 val;

	/* Custom get/set_user functions, fallback to generic if NULL */
	int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
			const struct kvm_one_reg *reg, void __user *uaddr);
	int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
			const struct kvm_one_reg *reg, void __user *uaddr);
};

static inline void print_sys_reg_instr(const struct sys_reg_params *p)
{
	/* Look, we even formatted it for you to paste into the table! */
	kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
		      p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
}

static inline bool ignore_write(struct kvm_vcpu *vcpu,
				const struct sys_reg_params *p)
{
	return true;
}

static inline bool read_zero(struct kvm_vcpu *vcpu,
			     struct sys_reg_params *p)
{
	p->regval = 0;
	return true;
}

static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
				      const struct sys_reg_params *params)
{
	kvm_debug("sys_reg write to read-only register at: %lx\n",
		  *vcpu_pc(vcpu));
	print_sys_reg_instr(params);
	return false;
}

static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
					const struct sys_reg_params *params)
{
	kvm_debug("sys_reg read to write-only register at: %lx\n",
		  *vcpu_pc(vcpu));
	print_sys_reg_instr(params);
	return false;
}

/* Reset functions */
static inline void reset_unknown(struct kvm_vcpu *vcpu,
				 const struct sys_reg_desc *r)
{
	BUG_ON(!r->reg);
	BUG_ON(r->reg >= NR_SYS_REGS);
	vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
}

static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
	BUG_ON(!r->reg);
	BUG_ON(r->reg >= NR_SYS_REGS);
	vcpu_sys_reg(vcpu, r->reg) = r->val;
}

static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
			      const struct sys_reg_desc *i2)
{
	BUG_ON(i1 == i2);
	if (!i1)
		return 1;
	else if (!i2)
		return -1;
	if (i1->Op0 != i2->Op0)
		return i1->Op0 - i2->Op0;
	if (i1->Op1 != i2->Op1)
		return i1->Op1 - i2->Op1;
	if (i1->CRn != i2->CRn)
		return i1->CRn - i2->CRn;
	if (i1->CRm != i2->CRm)
		return i1->CRm - i2->CRm;
	return i1->Op2 - i2->Op2;
}


#define Op0(_x) 	.Op0 = _x
#define Op1(_x) 	.Op1 = _x
#define CRn(_x)		.CRn = _x
#define CRm(_x) 	.CRm = _x
#define Op2(_x) 	.Op2 = _x

#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */
Commit	Line	Data
7c8c5e6a MZ	1	/*
	2	* Copyright (C) 2012,2013 - ARM Ltd
	3	* Author: Marc Zyngier <marc.zyngier@arm.com>
	4	*
	5	* Derived from arch/arm/kvm/coproc.h
	6	* Copyright (C) 2012 - Virtual Open Systems and Columbia University
	7	* Authors: Christoffer Dall <c.dall@virtualopensystems.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License, version 2, as
	11	* published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
	23	#define __ARM64_KVM_SYS_REGS_LOCAL_H__
	24
	25	struct sys_reg_params {
	26	u8 Op0;
	27	u8 Op1;
	28	u8 CRn;
	29	u8 CRm;
	30	u8 Op2;
2ec5be3d	31	u64 regval;
7c8c5e6a	32	bool is_write;
2072d29c MZ	33	bool is_aarch32;
2072d29c MZ	34	bool is_32bit; /* Only valid if is_aarch32 is true */
7c8c5e6a MZ	35	};
	36
	37	struct sys_reg_desc {
	38	/* MRS/MSR instruction which accesses it. */
	39	u8 Op0;
	40	u8 Op1;
	41	u8 CRn;
	42	u8 CRm;
	43	u8 Op2;
	44
	45	/* Trapped access from guest, if non-NULL. */
	46	bool (access)(struct kvm_vcpu ,
3fec037d	47	struct sys_reg_params *,
7c8c5e6a MZ	48	const struct sys_reg_desc *);
	49
	50	/* Initialization for vcpu. */
	51	void (reset)(struct kvm_vcpu , const struct sys_reg_desc *);
	52
	53	/* Index into sys_reg[], or 0 if we don't need to save it. */
	54	int reg;
	55
	56	/* Value (usually reset value) */
	57	u64 val;
84e690bf AB	58
	59	/* Custom get/set_user functions, fallback to generic if NULL */
	60	int (get_user)(struct kvm_vcpu vcpu, const struct sys_reg_desc *rd,
	61	const struct kvm_one_reg reg, void __user uaddr);
	62	int (set_user)(struct kvm_vcpu vcpu, const struct sys_reg_desc *rd,
	63	const struct kvm_one_reg reg, void __user uaddr);
7c8c5e6a MZ	64	};
	65
	66	static inline void print_sys_reg_instr(const struct sys_reg_params *p)
	67	{
	68	/* Look, we even formatted it for you to paste into the table! */
	69	kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
	70	p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
	71	}
	72
	73	static inline bool ignore_write(struct kvm_vcpu *vcpu,
	74	const struct sys_reg_params *p)
	75	{
	76	return true;
	77	}
	78
	79	static inline bool read_zero(struct kvm_vcpu *vcpu,
3fec037d	80	struct sys_reg_params *p)
7c8c5e6a	81	{
2ec5be3d	82	p->regval = 0;
7c8c5e6a MZ	83	return true;
	84	}
	85
	86	static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
	87	const struct sys_reg_params *params)
	88	{
	89	kvm_debug("sys_reg write to read-only register at: %lx\n",
	90	*vcpu_pc(vcpu));
	91	print_sys_reg_instr(params);
	92	return false;
	93	}
	94
	95	static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
	96	const struct sys_reg_params *params)
	97	{
	98	kvm_debug("sys_reg read to write-only register at: %lx\n",
	99	*vcpu_pc(vcpu));
	100	print_sys_reg_instr(params);
	101	return false;
	102	}
	103
	104	/* Reset functions */
	105	static inline void reset_unknown(struct kvm_vcpu *vcpu,
	106	const struct sys_reg_desc *r)
	107	{
	108	BUG_ON(!r->reg);
	109	BUG_ON(r->reg >= NR_SYS_REGS);
	110	vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
	111	}
	112
	113	static inline void reset_val(struct kvm_vcpu vcpu, const struct sys_reg_desc r)
	114	{
	115	BUG_ON(!r->reg);
	116	BUG_ON(r->reg >= NR_SYS_REGS);
	117	vcpu_sys_reg(vcpu, r->reg) = r->val;
	118	}
	119
	120	static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
	121	const struct sys_reg_desc *i2)
	122	{
	123	BUG_ON(i1 == i2);
	124	if (!i1)
	125	return 1;
	126	else if (!i2)
	127	return -1;
	128	if (i1->Op0 != i2->Op0)
	129	return i1->Op0 - i2->Op0;
	130	if (i1->Op1 != i2->Op1)
	131	return i1->Op1 - i2->Op1;
	132	if (i1->CRn != i2->CRn)
	133	return i1->CRn - i2->CRn;
	134	if (i1->CRm != i2->CRm)
	135	return i1->CRm - i2->CRm;
	136	return i1->Op2 - i2->Op2;
	137	}
	138
	139
	140	#define Op0(_x) .Op0 = _x
	141	#define Op1(_x) .Op1 = _x
	142	#define CRn(_x) .CRn = _x
	143	#define CRm(_x) .CRm = _x
	144	#define Op2(_x) .Op2 = _x
	145
	146	#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */