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 u64 regval; 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 /* Sysreg string for debug */ 39 const char *name; 40 41 /* MRS/MSR instruction which accesses it. */ 42 u8 Op0; 43 u8 Op1; 44 u8 CRn; 45 u8 CRm; 46 u8 Op2; 47 48 /* Trapped access from guest, if non-NULL. */ 49 bool (*access)(struct kvm_vcpu *, 50 struct sys_reg_params *, 51 const struct sys_reg_desc *); 52 53 /* Initialization for vcpu. */ 54 void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *); 55 56 /* Index into sys_reg[], or 0 if we don't need to save it. */ 57 int reg; 58 59 /* Value (usually reset value) */ 60 u64 val; 61 62 /* Custom get/set_user functions, fallback to generic if NULL */ 63 int (*get_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 64 const struct kvm_one_reg *reg, void __user *uaddr); 65 int (*set_user)(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, 66 const struct kvm_one_reg *reg, void __user *uaddr); 67 }; 68 69 static inline void print_sys_reg_instr(const struct sys_reg_params *p) 70 { 71 /* Look, we even formatted it for you to paste into the table! */ 72 kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n", 73 p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read"); 74 } 75 76 static inline bool ignore_write(struct kvm_vcpu *vcpu, 77 const struct sys_reg_params *p) 78 { 79 return true; 80 } 81 82 static inline bool read_zero(struct kvm_vcpu *vcpu, 83 struct sys_reg_params *p) 84 { 85 p->regval = 0; 86 return true; 87 } 88 89 /* Reset functions */ 90 static inline void reset_unknown(struct kvm_vcpu *vcpu, 91 const struct sys_reg_desc *r) 92 { 93 BUG_ON(!r->reg); 94 BUG_ON(r->reg >= NR_SYS_REGS); 95 __vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL; 96 } 97 98 static inline void reset_val(struct kvm_vcpu *vcpu, 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) = r->val; 103 } 104 105 static inline int cmp_sys_reg(const struct sys_reg_desc *i1, 106 const struct sys_reg_desc *i2) 107 { 108 BUG_ON(i1 == i2); 109 if (!i1) 110 return 1; 111 else if (!i2) 112 return -1; 113 if (i1->Op0 != i2->Op0) 114 return i1->Op0 - i2->Op0; 115 if (i1->Op1 != i2->Op1) 116 return i1->Op1 - i2->Op1; 117 if (i1->CRn != i2->CRn) 118 return i1->CRn - i2->CRn; 119 if (i1->CRm != i2->CRm) 120 return i1->CRm - i2->CRm; 121 return i1->Op2 - i2->Op2; 122 } 123 124 const struct sys_reg_desc *find_reg_by_id(u64 id, 125 struct sys_reg_params *params, 126 const struct sys_reg_desc table[], 127 unsigned int num); 128 129 #define Op0(_x) .Op0 = _x 130 #define Op1(_x) .Op1 = _x 131 #define CRn(_x) .CRn = _x 132 #define CRm(_x) .CRm = _x 133 #define Op2(_x) .Op2 = _x 134 135 #define SYS_DESC(reg) \ 136 .name = #reg, \ 137 Op0(sys_reg_Op0(reg)), Op1(sys_reg_Op1(reg)), \ 138 CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)), \ 139 Op2(sys_reg_Op2(reg)) 140 141 #endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */ 142