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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
5 */
6
7#ifndef __ARM_KVM_COPROC_LOCAL_H__
8#define __ARM_KVM_COPROC_LOCAL_H__
9
10struct coproc_params {
11 unsigned long CRn;
12 unsigned long CRm;
13 unsigned long Op1;
14 unsigned long Op2;
15 unsigned long Rt1;
16 unsigned long Rt2;
17 bool is_64bit;
18 bool is_write;
19};
20
21struct coproc_reg {
22 /* MRC/MCR/MRRC/MCRR instruction which accesses it. */
23 unsigned long CRn;
24 unsigned long CRm;
25 unsigned long Op1;
26 unsigned long Op2;
27
28 bool is_64bit;
29
30 /* Trapped access from guest, if non-NULL. */
31 bool (*access)(struct kvm_vcpu *,
32 const struct coproc_params *,
33 const struct coproc_reg *);
34
35 /* Initialization for vcpu. */
36 void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
37
38 /* Index into vcpu_cp15(vcpu, ...), or 0 if we don't need to save it. */
39 unsigned long reg;
40
41 /* Value (usually reset value) */
42 u64 val;
43};
44
45static inline void print_cp_instr(const struct coproc_params *p)
46{
47 /* Look, we even formatted it for you to paste into the table! */
48 if (p->is_64bit) {
49 kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
50 p->CRn, p->Op1, p->is_write ? "write" : "read");
51 } else {
52 kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
53 " func_%s },\n",
54 p->CRn, p->CRm, p->Op1, p->Op2,
55 p->is_write ? "write" : "read");
56 }
57}
58
59static inline bool ignore_write(struct kvm_vcpu *vcpu,
60 const struct coproc_params *p)
61{
62 return true;
63}
64
65static inline bool read_zero(struct kvm_vcpu *vcpu,
66 const struct coproc_params *p)
67{
68 *vcpu_reg(vcpu, p->Rt1) = 0;
69 return true;
70}
71
72/* Reset functions */
73static inline void reset_unknown(struct kvm_vcpu *vcpu,
74 const struct coproc_reg *r)
75{
76 BUG_ON(!r->reg);
77 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
78 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
79}
80
81static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
82{
83 BUG_ON(!r->reg);
84 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
85 vcpu_cp15(vcpu, r->reg) = r->val;
86}
87
88static inline void reset_unknown64(struct kvm_vcpu *vcpu,
89 const struct coproc_reg *r)
90{
91 BUG_ON(!r->reg);
92 BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
93
94 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
95 vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
96}
97
98static inline int cmp_reg(const struct coproc_reg *i1,
99 const struct coproc_reg *i2)
100{
101 BUG_ON(i1 == i2);
102 if (!i1)
103 return 1;
104 else if (!i2)
105 return -1;
106 if (i1->CRn != i2->CRn)
107 return i1->CRn - i2->CRn;
108 if (i1->CRm != i2->CRm)
109 return i1->CRm - i2->CRm;
110 if (i1->Op1 != i2->Op1)
111 return i1->Op1 - i2->Op1;
112 if (i1->Op2 != i2->Op2)
113 return i1->Op2 - i2->Op2;
114 return i2->is_64bit - i1->is_64bit;
115}
116
117
118#define CRn(_x) .CRn = _x
119#define CRm(_x) .CRm = _x
120#define CRm64(_x) .CRn = _x, .CRm = 0
121#define Op1(_x) .Op1 = _x
122#define Op2(_x) .Op2 = _x
123#define is64 .is_64bit = true
124#define is32 .is_64bit = false
125
126bool access_vm_reg(struct kvm_vcpu *vcpu,
127 const struct coproc_params *p,
128 const struct coproc_reg *r);
129
130#endif /* __ARM_KVM_COPROC_LOCAL_H__ */
1/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Authors: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#ifndef __ARM_KVM_COPROC_LOCAL_H__
20#define __ARM_KVM_COPROC_LOCAL_H__
21
22struct coproc_params {
23 unsigned long CRn;
24 unsigned long CRm;
25 unsigned long Op1;
26 unsigned long Op2;
27 unsigned long Rt1;
28 unsigned long Rt2;
29 bool is_64bit;
30 bool is_write;
31};
32
33struct coproc_reg {
34 /* MRC/MCR/MRRC/MCRR instruction which accesses it. */
35 unsigned long CRn;
36 unsigned long CRm;
37 unsigned long Op1;
38 unsigned long Op2;
39
40 bool is_64bit;
41
42 /* Trapped access from guest, if non-NULL. */
43 bool (*access)(struct kvm_vcpu *,
44 const struct coproc_params *,
45 const struct coproc_reg *);
46
47 /* Initialization for vcpu. */
48 void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
49
50 /* Index into vcpu_cp15(vcpu, ...), or 0 if we don't need to save it. */
51 unsigned long reg;
52
53 /* Value (usually reset value) */
54 u64 val;
55};
56
57static inline void print_cp_instr(const struct coproc_params *p)
58{
59 /* Look, we even formatted it for you to paste into the table! */
60 if (p->is_64bit) {
61 kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
62 p->CRn, p->Op1, p->is_write ? "write" : "read");
63 } else {
64 kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
65 " func_%s },\n",
66 p->CRn, p->CRm, p->Op1, p->Op2,
67 p->is_write ? "write" : "read");
68 }
69}
70
71static inline bool ignore_write(struct kvm_vcpu *vcpu,
72 const struct coproc_params *p)
73{
74 return true;
75}
76
77static inline bool read_zero(struct kvm_vcpu *vcpu,
78 const struct coproc_params *p)
79{
80 *vcpu_reg(vcpu, p->Rt1) = 0;
81 return true;
82}
83
84static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
85 const struct coproc_params *params)
86{
87 kvm_debug("CP15 write to read-only register at: %08lx\n",
88 *vcpu_pc(vcpu));
89 print_cp_instr(params);
90 return false;
91}
92
93static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
94 const struct coproc_params *params)
95{
96 kvm_debug("CP15 read to write-only register at: %08lx\n",
97 *vcpu_pc(vcpu));
98 print_cp_instr(params);
99 return false;
100}
101
102/* Reset functions */
103static inline void reset_unknown(struct kvm_vcpu *vcpu,
104 const struct coproc_reg *r)
105{
106 BUG_ON(!r->reg);
107 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
108 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
109}
110
111static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
112{
113 BUG_ON(!r->reg);
114 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
115 vcpu_cp15(vcpu, r->reg) = r->val;
116}
117
118static inline void reset_unknown64(struct kvm_vcpu *vcpu,
119 const struct coproc_reg *r)
120{
121 BUG_ON(!r->reg);
122 BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
123
124 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
125 vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
126}
127
128static inline int cmp_reg(const struct coproc_reg *i1,
129 const struct coproc_reg *i2)
130{
131 BUG_ON(i1 == i2);
132 if (!i1)
133 return 1;
134 else if (!i2)
135 return -1;
136 if (i1->CRn != i2->CRn)
137 return i1->CRn - i2->CRn;
138 if (i1->CRm != i2->CRm)
139 return i1->CRm - i2->CRm;
140 if (i1->Op1 != i2->Op1)
141 return i1->Op1 - i2->Op1;
142 if (i1->Op2 != i2->Op2)
143 return i1->Op2 - i2->Op2;
144 return i2->is_64bit - i1->is_64bit;
145}
146
147
148#define CRn(_x) .CRn = _x
149#define CRm(_x) .CRm = _x
150#define CRm64(_x) .CRn = _x, .CRm = 0
151#define Op1(_x) .Op1 = _x
152#define Op2(_x) .Op2 = _x
153#define is64 .is_64bit = true
154#define is32 .is_64bit = false
155
156bool access_vm_reg(struct kvm_vcpu *vcpu,
157 const struct coproc_params *p,
158 const struct coproc_reg *r);
159
160#endif /* __ARM_KVM_COPROC_LOCAL_H__ */