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Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +00001/*
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
25struct sys_reg_params {
26 u8 Op0;
27 u8 Op1;
28 u8 CRn;
29 u8 CRm;
30 u8 Op2;
Pavel Fedin2ec5be32015-12-04 15:03:13 +030031 u64 regval;
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000032 bool is_write;
Marc Zyngier2072d292014-01-21 10:55:17 +000033 bool is_aarch32;
34 bool is_32bit; /* Only valid if is_aarch32 is true */
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000035};
36
37struct 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 *,
Pavel Fedin3fec0372015-12-04 15:03:12 +030047 struct sys_reg_params *,
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000048 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;
Alex Bennée84e690b2015-07-07 17:30:00 +010058
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);
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000064};
65
66static 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
73static inline bool ignore_write(struct kvm_vcpu *vcpu,
74 const struct sys_reg_params *p)
75{
76 return true;
77}
78
79static inline bool read_zero(struct kvm_vcpu *vcpu,
Pavel Fedin3fec0372015-12-04 15:03:12 +030080 struct sys_reg_params *p)
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000081{
Pavel Fedin2ec5be32015-12-04 15:03:13 +030082 p->regval = 0;
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +000083 return true;
84}
85
86static 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
95static 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 */
105static 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
113static 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
120static 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__ */