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
10 struct 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
21 struct 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
print_cp_instr(const struct coproc_params * p)45 static 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
ignore_write(struct kvm_vcpu * vcpu,const struct coproc_params * p)59 static inline bool ignore_write(struct kvm_vcpu *vcpu,
60 const struct coproc_params *p)
61 {
62 return true;
63 }
64
read_zero(struct kvm_vcpu * vcpu,const struct coproc_params * p)65 static 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 */
reset_unknown(struct kvm_vcpu * vcpu,const struct coproc_reg * r)73 static 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
reset_val(struct kvm_vcpu * vcpu,const struct coproc_reg * r)81 static 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
reset_unknown64(struct kvm_vcpu * vcpu,const struct coproc_reg * r)88 static 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
cmp_reg(const struct coproc_reg * i1,const struct coproc_reg * i2)98 static 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
126 bool 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__ */
131