1/* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License, version 2, as 4 * published by the Free Software Foundation. 5 * 6 * This program is distributed in the hope that it will be useful, 7 * but WITHOUT ANY WARRANTY; without even the implied warranty of 8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9 * GNU General Public License for more details. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program; if not, write to the Free Software 13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14 * 15 * Copyright IBM Corp. 2008 16 * 17 * Authors: Hollis Blanchard <hollisb@us.ibm.com> 18 */ 19 20#include <asm/kvm_ppc.h> 21#include <asm/dcr.h> 22#include <asm/dcr-regs.h> 23#include <asm/disassemble.h> 24#include <asm/kvm_44x.h> 25#include "timing.h" 26 27#include "booke.h" 28#include "44x_tlb.h" 29 30#define XOP_MFDCR 323 31#define XOP_MTDCR 451 32#define XOP_TLBSX 914 33#define XOP_ICCCI 966 34#define XOP_TLBWE 978 35 36int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu, 37 unsigned int inst, int *advance) 38{ 39 int emulated = EMULATE_DONE; 40 int dcrn; 41 int ra; 42 int rb; 43 int rc; 44 int rs; 45 int rt; 46 int ws; 47 48 switch (get_op(inst)) { 49 case 31: 50 switch (get_xop(inst)) { 51 52 case XOP_MFDCR: 53 dcrn = get_dcrn(inst); 54 rt = get_rt(inst); 55 56 /* The guest may access CPR0 registers to determine the timebase 57 * frequency, and it must know the real host frequency because it 58 * can directly access the timebase registers. 59 * 60 * It would be possible to emulate those accesses in userspace, 61 * but userspace can really only figure out the end frequency. 62 * We could decompose that into the factors that compute it, but 63 * that's tricky math, and it's easier to just report the real 64 * CPR0 values. 65 */ 66 switch (dcrn) { 67 case DCRN_CPR0_CONFIG_ADDR: 68 kvmppc_set_gpr(vcpu, rt, vcpu->arch.cpr0_cfgaddr); 69 break; 70 case DCRN_CPR0_CONFIG_DATA: 71 local_irq_disable(); 72 mtdcr(DCRN_CPR0_CONFIG_ADDR, 73 vcpu->arch.cpr0_cfgaddr); 74 kvmppc_set_gpr(vcpu, rt, 75 mfdcr(DCRN_CPR0_CONFIG_DATA)); 76 local_irq_enable(); 77 break; 78 default: 79 run->dcr.dcrn = dcrn; 80 run->dcr.data = 0; 81 run->dcr.is_write = 0; 82 vcpu->arch.io_gpr = rt; 83 vcpu->arch.dcr_needed = 1; 84 kvmppc_account_exit(vcpu, DCR_EXITS); 85 emulated = EMULATE_DO_DCR; 86 } 87 88 break; 89 90 case XOP_MTDCR: 91 dcrn = get_dcrn(inst); 92 rs = get_rs(inst); 93 94 /* emulate some access in kernel */ 95 switch (dcrn) { 96 case DCRN_CPR0_CONFIG_ADDR: 97 vcpu->arch.cpr0_cfgaddr = kvmppc_get_gpr(vcpu, rs); 98 break; 99 default: 100 run->dcr.dcrn = dcrn; 101 run->dcr.data = kvmppc_get_gpr(vcpu, rs); 102 run->dcr.is_write = 1; 103 vcpu->arch.dcr_needed = 1; 104 kvmppc_account_exit(vcpu, DCR_EXITS); 105 emulated = EMULATE_DO_DCR; 106 } 107 108 break; 109 110 case XOP_TLBWE: 111 ra = get_ra(inst); 112 rs = get_rs(inst); 113 ws = get_ws(inst); 114 emulated = kvmppc_44x_emul_tlbwe(vcpu, ra, rs, ws); 115 break; 116 117 case XOP_TLBSX: 118 rt = get_rt(inst); 119 ra = get_ra(inst); 120 rb = get_rb(inst); 121 rc = get_rc(inst); 122 emulated = kvmppc_44x_emul_tlbsx(vcpu, rt, ra, rb, rc); 123 break; 124 125 case XOP_ICCCI: 126 break; 127 128 default: 129 emulated = EMULATE_FAIL; 130 } 131 132 break; 133 134 default: 135 emulated = EMULATE_FAIL; 136 } 137 138 if (emulated == EMULATE_FAIL) 139 emulated = kvmppc_booke_emulate_op(run, vcpu, inst, advance); 140 141 return emulated; 142} 143 144int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) 145{ 146 int emulated = EMULATE_DONE; 147 148 switch (sprn) { 149 case SPRN_PID: 150 kvmppc_set_pid(vcpu, kvmppc_get_gpr(vcpu, rs)); break; 151 case SPRN_MMUCR: 152 vcpu->arch.mmucr = kvmppc_get_gpr(vcpu, rs); break; 153 case SPRN_CCR0: 154 vcpu->arch.ccr0 = kvmppc_get_gpr(vcpu, rs); break; 155 case SPRN_CCR1: 156 vcpu->arch.ccr1 = kvmppc_get_gpr(vcpu, rs); break; 157 default: 158 emulated = kvmppc_booke_emulate_mtspr(vcpu, sprn, rs); 159 } 160 161 kvmppc_set_exit_type(vcpu, EMULATED_MTSPR_EXITS); 162 return emulated; 163} 164 165int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt) 166{ 167 int emulated = EMULATE_DONE; 168 169 switch (sprn) { 170 case SPRN_PID: 171 kvmppc_set_gpr(vcpu, rt, vcpu->arch.pid); break; 172 case SPRN_MMUCR: 173 kvmppc_set_gpr(vcpu, rt, vcpu->arch.mmucr); break; 174 case SPRN_CCR0: 175 kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr0); break; 176 case SPRN_CCR1: 177 kvmppc_set_gpr(vcpu, rt, vcpu->arch.ccr1); break; 178 default: 179 emulated = kvmppc_booke_emulate_mfspr(vcpu, sprn, rt); 180 } 181 182 kvmppc_set_exit_type(vcpu, EMULATED_MFSPR_EXITS); 183 return emulated; 184} 185