2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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>
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.
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.
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/>.
22 #ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
23 #define __ARM64_KVM_SYS_REGS_LOCAL_H__
25 struct sys_reg_params {
34 bool is_32bit; /* Only valid if is_aarch32 is true */
38 /* MRS/MSR instruction which accesses it. */
45 /* Trapped access from guest, if non-NULL. */
46 bool (*access)(struct kvm_vcpu *,
47 const struct sys_reg_params *,
48 const struct sys_reg_desc *);
50 /* Initialization for vcpu. */
51 void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
53 /* Index into sys_reg[], or 0 if we don't need to save it. */
56 /* Value (usually reset value) */
60 static inline void print_sys_reg_instr(const struct sys_reg_params *p)
62 /* Look, we even formatted it for you to paste into the table! */
63 kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
64 p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
67 static inline bool ignore_write(struct kvm_vcpu *vcpu,
68 const struct sys_reg_params *p)
73 static inline bool read_zero(struct kvm_vcpu *vcpu,
74 const struct sys_reg_params *p)
76 *vcpu_reg(vcpu, p->Rt) = 0;
80 static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
81 const struct sys_reg_params *params)
83 kvm_debug("sys_reg write to read-only register at: %lx\n",
85 print_sys_reg_instr(params);
89 static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
90 const struct sys_reg_params *params)
92 kvm_debug("sys_reg read to write-only register at: %lx\n",
94 print_sys_reg_instr(params);
99 static inline void reset_unknown(struct kvm_vcpu *vcpu,
100 const struct sys_reg_desc *r)
103 BUG_ON(r->reg >= NR_SYS_REGS);
104 vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
107 static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
110 BUG_ON(r->reg >= NR_SYS_REGS);
111 vcpu_sys_reg(vcpu, r->reg) = r->val;
114 static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
115 const struct sys_reg_desc *i2)
122 if (i1->Op0 != i2->Op0)
123 return i1->Op0 - i2->Op0;
124 if (i1->Op1 != i2->Op1)
125 return i1->Op1 - i2->Op1;
126 if (i1->CRn != i2->CRn)
127 return i1->CRn - i2->CRn;
128 if (i1->CRm != i2->CRm)
129 return i1->CRm - i2->CRm;
130 return i1->Op2 - i2->Op2;
134 #define Op0(_x) .Op0 = _x
135 #define Op1(_x) .Op1 = _x
136 #define CRn(_x) .CRn = _x
137 #define CRm(_x) .CRm = _x
138 #define Op2(_x) .Op2 = _x
140 #endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */