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
22 struct 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
33 struct 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
print_cp_instr(const struct coproc_params * p)57 static 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
ignore_write(struct kvm_vcpu * vcpu,const struct coproc_params * p)71 static inline bool ignore_write(struct kvm_vcpu *vcpu,
72 const struct coproc_params *p)
73 {
74 return true;
75 }
76
read_zero(struct kvm_vcpu * vcpu,const struct coproc_params * p)77 static 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
84 /* Reset functions */
reset_unknown(struct kvm_vcpu * vcpu,const struct coproc_reg * r)85 static inline void reset_unknown(struct kvm_vcpu *vcpu,
86 const struct coproc_reg *r)
87 {
88 BUG_ON(!r->reg);
89 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
90 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
91 }
92
reset_val(struct kvm_vcpu * vcpu,const struct coproc_reg * r)93 static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
94 {
95 BUG_ON(!r->reg);
96 BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
97 vcpu_cp15(vcpu, r->reg) = r->val;
98 }
99
reset_unknown64(struct kvm_vcpu * vcpu,const struct coproc_reg * r)100 static inline void reset_unknown64(struct kvm_vcpu *vcpu,
101 const struct coproc_reg *r)
102 {
103 BUG_ON(!r->reg);
104 BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
105
106 vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
107 vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
108 }
109
cmp_reg(const struct coproc_reg * i1,const struct coproc_reg * i2)110 static inline int cmp_reg(const struct coproc_reg *i1,
111 const struct coproc_reg *i2)
112 {
113 BUG_ON(i1 == i2);
114 if (!i1)
115 return 1;
116 else if (!i2)
117 return -1;
118 if (i1->CRn != i2->CRn)
119 return i1->CRn - i2->CRn;
120 if (i1->CRm != i2->CRm)
121 return i1->CRm - i2->CRm;
122 if (i1->Op1 != i2->Op1)
123 return i1->Op1 - i2->Op1;
124 if (i1->Op2 != i2->Op2)
125 return i1->Op2 - i2->Op2;
126 return i2->is_64bit - i1->is_64bit;
127 }
128
129
130 #define CRn(_x) .CRn = _x
131 #define CRm(_x) .CRm = _x
132 #define CRm64(_x) .CRn = _x, .CRm = 0
133 #define Op1(_x) .Op1 = _x
134 #define Op2(_x) .Op2 = _x
135 #define is64 .is_64bit = true
136 #define is32 .is_64bit = false
137
138 bool access_vm_reg(struct kvm_vcpu *vcpu,
139 const struct coproc_params *p,
140 const struct coproc_reg *r);
141
142 #endif /* __ARM_KVM_COPROC_LOCAL_H__ */
143