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 bool is_aarch32; 34 bool is_32bit; /* Only valid if is_aarch32 is true */ 35 }; 36 37 struct sys_reg_desc { 38 /* MRS/MSR instruction which accesses it. */ 39 u8 Op0; 40 u8 Op1; 41 u8 CRn; 42 u8 CRm; 43 u8 Op2; 44 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 *); 49 50 /* Initialization for vcpu. */ 51 void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *); 52 53 /* Index into sys_reg[], or 0 if we don't need to save it. */ 54 int reg; 55 56 /* Value (usually reset value) */ 57 u64 val; 58 59 /* Custom get/set_user functions, fallback to generic if NULL */ 60 int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 61 const struct kvm_one_reg *reg, void __user *uaddr); 62 int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 63 const struct kvm_one_reg *reg, void __user *uaddr); 64 }; 65 66 static inline void print_sys_reg_instr(const struct sys_reg_params *p) 67 { 68 /* Look, we even formatted it for you to paste into the table! */ 69 kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n", 70 p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read"); 71 } 72 73 static inline bool ignore_write(struct kvm_vcpu *vcpu, 74 const struct sys_reg_params *p) 75 { 76 return true; 77 } 78 79 static inline bool read_zero(struct kvm_vcpu *vcpu, 80 const struct sys_reg_params *p) 81 { 82 *vcpu_reg(vcpu, p->Rt) = 0; 83 return true; 84 } 85 86 static inline bool write_to_read_only(struct kvm_vcpu *vcpu, 87 const struct sys_reg_params *params) 88 { 89 kvm_debug("sys_reg write to read-only register at: %lx\n", 90 *vcpu_pc(vcpu)); 91 print_sys_reg_instr(params); 92 return false; 93 } 94 95 static inline bool read_from_write_only(struct kvm_vcpu *vcpu, 96 const struct sys_reg_params *params) 97 { 98 kvm_debug("sys_reg read to write-only register at: %lx\n", 99 *vcpu_pc(vcpu)); 100 print_sys_reg_instr(params); 101 return false; 102 } 103 104 /* Reset functions */ 105 static inline void reset_unknown(struct kvm_vcpu *vcpu, 106 const struct sys_reg_desc *r) 107 { 108 BUG_ON(!r->reg); 109 BUG_ON(r->reg >= NR_SYS_REGS); 110 vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL; 111 } 112 113 static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) 114 { 115 BUG_ON(!r->reg); 116 BUG_ON(r->reg >= NR_SYS_REGS); 117 vcpu_sys_reg(vcpu, r->reg) = r->val; 118 } 119 120 static inline int cmp_sys_reg(const struct sys_reg_desc *i1, 121 const struct sys_reg_desc *i2) 122 { 123 BUG_ON(i1 == i2); 124 if (!i1) 125 return 1; 126 else if (!i2) 127 return -1; 128 if (i1->Op0 != i2->Op0) 129 return i1->Op0 - i2->Op0; 130 if (i1->Op1 != i2->Op1) 131 return i1->Op1 - i2->Op1; 132 if (i1->CRn != i2->CRn) 133 return i1->CRn - i2->CRn; 134 if (i1->CRm != i2->CRm) 135 return i1->CRm - i2->CRm; 136 return i1->Op2 - i2->Op2; 137 } 138 139 140 #define Op0(_x) .Op0 = _x 141 #define Op1(_x) .Op1 = _x 142 #define CRn(_x) .CRn = _x 143 #define CRm(_x) .CRm = _x 144 #define Op2(_x) .Op2 = _x 145 146 #endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */ 147