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 25 struct 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 35 struct 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 58 static 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 65 static inline bool ignore_write(struct kvm_vcpu *vcpu, 66 const struct sys_reg_params *p) 67 { 68 return true; 69 } 70 71 static 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 78 static 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 87 static 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 */ 97 static 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 } 104 105 static 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 } 111 112 static 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__ */ 139