1 /* 2 * PowerPC emulation special registers manipulation helpers for qemu. 3 * 4 * Copyright (c) 2003-2007 Jocelyn Mayer 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef HELPER_REGS_H 21 #define HELPER_REGS_H 22 23 #include "qemu/main-loop.h" 24 #include "exec/exec-all.h" 25 26 /* Swap temporary saved registers with GPRs */ 27 static inline void hreg_swap_gpr_tgpr(CPUPPCState *env) 28 { 29 target_ulong tmp; 30 31 tmp = env->gpr[0]; 32 env->gpr[0] = env->tgpr[0]; 33 env->tgpr[0] = tmp; 34 tmp = env->gpr[1]; 35 env->gpr[1] = env->tgpr[1]; 36 env->tgpr[1] = tmp; 37 tmp = env->gpr[2]; 38 env->gpr[2] = env->tgpr[2]; 39 env->tgpr[2] = tmp; 40 tmp = env->gpr[3]; 41 env->gpr[3] = env->tgpr[3]; 42 env->tgpr[3] = tmp; 43 } 44 45 static inline void hreg_compute_mem_idx(CPUPPCState *env) 46 { 47 /* 48 * This is our encoding for server processors. The architecture 49 * specifies that there is no such thing as userspace with 50 * translation off, however it appears that MacOS does it and some 51 * 32-bit CPUs support it. Weird... 52 * 53 * 0 = Guest User space virtual mode 54 * 1 = Guest Kernel space virtual mode 55 * 2 = Guest User space real mode 56 * 3 = Guest Kernel space real mode 57 * 4 = HV User space virtual mode 58 * 5 = HV Kernel space virtual mode 59 * 6 = HV User space real mode 60 * 7 = HV Kernel space real mode 61 * 62 * For BookE, we need 8 MMU modes as follow: 63 * 64 * 0 = AS 0 HV User space 65 * 1 = AS 0 HV Kernel space 66 * 2 = AS 1 HV User space 67 * 3 = AS 1 HV Kernel space 68 * 4 = AS 0 Guest User space 69 * 5 = AS 0 Guest Kernel space 70 * 6 = AS 1 Guest User space 71 * 7 = AS 1 Guest Kernel space 72 */ 73 if (env->mmu_model & POWERPC_MMU_BOOKE) { 74 env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1; 75 env->immu_idx += msr_is ? 2 : 0; 76 env->dmmu_idx += msr_ds ? 2 : 0; 77 env->immu_idx += msr_gs ? 4 : 0; 78 env->dmmu_idx += msr_gs ? 4 : 0; 79 } else { 80 env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1; 81 env->immu_idx += msr_ir ? 0 : 2; 82 env->dmmu_idx += msr_dr ? 0 : 2; 83 env->immu_idx += msr_hv ? 4 : 0; 84 env->dmmu_idx += msr_hv ? 4 : 0; 85 } 86 } 87 88 static inline void hreg_compute_hflags(CPUPPCState *env) 89 { 90 target_ulong hflags_mask; 91 92 /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */ 93 hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) | 94 (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) | 95 (1 << MSR_LE) | (1 << MSR_VSX) | (1 << MSR_IR) | (1 << MSR_DR); 96 hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB; 97 hreg_compute_mem_idx(env); 98 env->hflags = env->msr & hflags_mask; 99 /* Merge with hflags coming from other registers */ 100 env->hflags |= env->hflags_nmsr; 101 } 102 103 static inline void cpu_interrupt_exittb(CPUState *cs) 104 { 105 if (!qemu_mutex_iothread_locked()) { 106 qemu_mutex_lock_iothread(); 107 cpu_interrupt(cs, CPU_INTERRUPT_EXITTB); 108 qemu_mutex_unlock_iothread(); 109 } else { 110 cpu_interrupt(cs, CPU_INTERRUPT_EXITTB); 111 } 112 } 113 114 static inline int hreg_store_msr(CPUPPCState *env, target_ulong value, 115 int alter_hv) 116 { 117 int excp; 118 #if !defined(CONFIG_USER_ONLY) 119 CPUState *cs = CPU(ppc_env_get_cpu(env)); 120 #endif 121 122 excp = 0; 123 value &= env->msr_mask; 124 #if !defined(CONFIG_USER_ONLY) 125 /* Neither mtmsr nor guest state can alter HV */ 126 if (!alter_hv || !(env->msr & MSR_HVB)) { 127 value &= ~MSR_HVB; 128 value |= env->msr & MSR_HVB; 129 } 130 if (((value >> MSR_IR) & 1) != msr_ir || 131 ((value >> MSR_DR) & 1) != msr_dr) { 132 cpu_interrupt_exittb(cs); 133 } 134 if ((env->mmu_model & POWERPC_MMU_BOOKE) && 135 ((value >> MSR_GS) & 1) != msr_gs) { 136 cpu_interrupt_exittb(cs); 137 } 138 if (unlikely((env->flags & POWERPC_FLAG_TGPR) && 139 ((value ^ env->msr) & (1 << MSR_TGPR)))) { 140 /* Swap temporary saved registers with GPRs */ 141 hreg_swap_gpr_tgpr(env); 142 } 143 if (unlikely((value >> MSR_EP) & 1) != msr_ep) { 144 /* Change the exception prefix on PowerPC 601 */ 145 env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000; 146 } 147 /* 148 * If PR=1 then EE, IR and DR must be 1 149 * 150 * Note: We only enforce this on 64-bit server processors. 151 * It appears that: 152 * - 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS 153 * exploits it. 154 * - 64-bit embedded implementations do not need any operation to be 155 * performed when PR is set. 156 */ 157 if (is_book3s_arch2x(env) && ((value >> MSR_PR) & 1)) { 158 value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR); 159 } 160 #endif 161 env->msr = value; 162 hreg_compute_hflags(env); 163 #if !defined(CONFIG_USER_ONLY) 164 if (unlikely(msr_pow == 1)) { 165 if (!env->pending_interrupts && (*env->check_pow)(env)) { 166 cs->halted = 1; 167 excp = EXCP_HALTED; 168 } 169 } 170 #endif 171 172 return excp; 173 } 174 175 #if !defined(CONFIG_USER_ONLY) 176 static inline void check_tlb_flush(CPUPPCState *env, bool global) 177 { 178 CPUState *cs = CPU(ppc_env_get_cpu(env)); 179 180 /* Handle global flushes first */ 181 if (global && (env->tlb_need_flush & TLB_NEED_GLOBAL_FLUSH)) { 182 env->tlb_need_flush &= ~TLB_NEED_GLOBAL_FLUSH; 183 env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH; 184 tlb_flush_all_cpus_synced(cs); 185 return; 186 } 187 188 /* Then handle local ones */ 189 if (env->tlb_need_flush & TLB_NEED_LOCAL_FLUSH) { 190 env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH; 191 tlb_flush(cs); 192 } 193 } 194 #else 195 static inline void check_tlb_flush(CPUPPCState *env, bool global) { } 196 #endif 197 198 #endif /* HELPER_REGS_H */ 199