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gerrit-public.fairphone.software / kernel / msm-4.19 / acf47ee741c4a5eb8a17438e8858f1cffa1e073a / . / arch / arm64 / kvm / sys_regs.h
blob: d50d3722998ef1365ab0b5400735acccc7b4197a [file] [log] [blame]
Marc Zyngier7c8c5e6a2012-12-10 16:15:34 +0000[diff] [blame]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
25struct sys_reg_params {
26 u8 Op0;
27 u8 Op1;
28 u8 CRn;
29 u8 CRm;
30 u8 Op2;
31 u8 Rt;
32 bool is_write;
33};
34
35struct sys_reg_desc {
36 /* MRS/MSR instruction which accesses it. */
37 u8 Op0;
38 u8 Op1;
39 u8 CRn;
40 u8 CRm;
41 u8 Op2;
42
43 /* Trapped access from guest, if non-NULL. */
44 bool (*access)(struct kvm_vcpu *,
45 const struct sys_reg_params *,
46 const struct sys_reg_desc *);
47
48 /* Initialization for vcpu. */
49 void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
50
51 /* Index into sys_reg[], or 0 if we don't need to save it. */
52 int reg;
53
54 /* Value (usually reset value) */
55 u64 val;
56};
57
58static inline void print_sys_reg_instr(const struct sys_reg_params *p)
59{
60 /* Look, we even formatted it for you to paste into the table! */
61 kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
62 p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
63}
64
65static inline bool ignore_write(struct kvm_vcpu *vcpu,
66 const struct sys_reg_params *p)
67{
68 return true;
69}
70
71static inline bool read_zero(struct kvm_vcpu *vcpu,
72 const struct sys_reg_params *p)
73{
74 *vcpu_reg(vcpu, p->Rt) = 0;
75 return true;
76}
77
78static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
79 const struct sys_reg_params *params)
80{
81 kvm_debug("sys_reg write to read-only register at: %lx\n",
82 *vcpu_pc(vcpu));
83 print_sys_reg_instr(params);
84 return false;
85}
86
87static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
88 const struct sys_reg_params *params)
89{
90 kvm_debug("sys_reg read to write-only register at: %lx\n",
91 *vcpu_pc(vcpu));
92 print_sys_reg_instr(params);
93 return false;
94}
95
96/* Reset functions */
97static inline void reset_unknown(struct kvm_vcpu *vcpu,
98 const struct sys_reg_desc *r)
99{
100 BUG_ON(!r->reg);
101 BUG_ON(r->reg >= NR_SYS_REGS);
102 vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
103}
104
105static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
106{
107 BUG_ON(!r->reg);
108 BUG_ON(r->reg >= NR_SYS_REGS);
109 vcpu_sys_reg(vcpu, r->reg) = r->val;
110}
111
112static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
113 const struct sys_reg_desc *i2)
114{
115 BUG_ON(i1 == i2);
116 if (!i1)
117 return 1;
118 else if (!i2)
119 return -1;
120 if (i1->Op0 != i2->Op0)
121 return i1->Op0 - i2->Op0;
122 if (i1->Op1 != i2->Op1)
123 return i1->Op1 - i2->Op1;
124 if (i1->CRn != i2->CRn)
125 return i1->CRn - i2->CRn;
126 if (i1->CRm != i2->CRm)
127 return i1->CRm - i2->CRm;
128 return i1->Op2 - i2->Op2;
129}
130
131
132#define Op0(_x) .Op0 = _x
133#define Op1(_x) .Op1 = _x
134#define CRn(_x) .CRn = _x
135#define CRm(_x) .CRm = _x
136#define Op2(_x) .Op2 = _x
137
138#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */