target/ppc/helper_regs.h

   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     /* This is our encoding for server processors. The architecture
  48      * specifies that there is no such thing as userspace with
  49      * translation off, however it appears that MacOS does it and
  50      * some 32-bit CPUs support it. Weird...
  51      *
  52      *   0 = Guest User space virtual mode
  53      *   1 = Guest Kernel space virtual mode
  54      *   2 = Guest User space real mode
  55      *   3 = Guest Kernel space real mode
  56      *   4 = HV User space virtual mode
  57      *   5 = HV Kernel space virtual mode
  58      *   6 = HV User space real mode
  59      *   7 = HV Kernel space real mode
  60      *
  61      * For BookE, we need 8 MMU modes as follow:
  62      *
  63      *  0 = AS 0 HV User space
  64      *  1 = AS 0 HV Kernel space
  65      *  2 = AS 1 HV User space
  66      *  3 = AS 1 HV Kernel space
  67      *  4 = AS 0 Guest User space
  68      *  5 = AS 0 Guest Kernel space
  69      *  6 = AS 1 Guest User space
  70      *  7 = AS 1 Guest Kernel space
  71      */
  72     if (env->mmu_model & POWERPC_MMU_BOOKE) {
  73         env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
  74         env->immu_idx += msr_is ? 2 : 0;
  75         env->dmmu_idx += msr_ds ? 2 : 0;
  76         env->immu_idx += msr_gs ? 4 : 0;
  77         env->dmmu_idx += msr_gs ? 4 : 0;
  78     } else {
  79         env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
  80         env->immu_idx += msr_ir ? 0 : 2;
  81         env->dmmu_idx += msr_dr ? 0 : 2;
  82         env->immu_idx += msr_hv ? 4 : 0;
  83         env->dmmu_idx += msr_hv ? 4 : 0;
  84     }
  85 }
  86
  87 static inline void hreg_compute_hflags(CPUPPCState *env)
  88 {
  89     target_ulong hflags_mask;
  90
  91     /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
  92     hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
  93         (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
  94         (1 << MSR_LE) | (1 << MSR_VSX) | (1 << MSR_IR) | (1 << MSR_DR);
  95     hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
  96     hreg_compute_mem_idx(env);
  97     env->hflags = env->msr & hflags_mask;
  98     /* Merge with hflags coming from other registers */
  99     env->hflags |= env->hflags_nmsr;
 100 }
 101
 102 static inline void cpu_interrupt_exittb(CPUState *cs)
 103 {
 104     if (!qemu_mutex_iothread_locked()) {
 105         qemu_mutex_lock_iothread();
 106         cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
 107         qemu_mutex_unlock_iothread();
 108     } else {
 109         cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
 110     }
 111 }
 112
 113 static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
 114                                  int alter_hv)
 115 {
 116     int excp;
 117 #if !defined(CONFIG_USER_ONLY)
 118     CPUState *cs = CPU(ppc_env_get_cpu(env));
 119 #endif
 120
 121     excp = 0;
 122     value &= env->msr_mask;
 123 #if !defined(CONFIG_USER_ONLY)
 124     /* Neither mtmsr nor guest state can alter HV */
 125     if (!alter_hv || !(env->msr & MSR_HVB)) {
 126         value &= ~MSR_HVB;
 127         value |= env->msr & MSR_HVB;
 128     }
 129     if (((value >> MSR_IR) & 1) != msr_ir ||
 130         ((value >> MSR_DR) & 1) != msr_dr) {
 131         cpu_interrupt_exittb(cs);
 132     }
 133     if ((env->mmu_model & POWERPC_MMU_BOOKE) &&
 134         ((value >> MSR_GS) & 1) != msr_gs) {
 135         cpu_interrupt_exittb(cs);
 136     }
 137     if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
 138                  ((value ^ env->msr) & (1 << MSR_TGPR)))) {
 139         /* Swap temporary saved registers with GPRs */
 140         hreg_swap_gpr_tgpr(env);
 141     }
 142     if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
 143         /* Change the exception prefix on PowerPC 601 */
 144         env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
 145     }
 146     /* If PR=1 then EE, IR and DR must be 1
 147      *
 148      * Note: We only enforce this on 64-bit server processors.
 149      * It appears that:
 150      * - 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
 151      *   exploits it.
 152      * - 64-bit embedded implementations do not need any operation to be
 153      *   performed when PR is set.
 154      */
 155     if (is_book3s_arch2x(env) && ((value >> MSR_PR) & 1)) {
 156         value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
 157     }
 158 #endif
 159     env->msr = value;
 160     hreg_compute_hflags(env);
 161 #if !defined(CONFIG_USER_ONLY)
 162     if (unlikely(msr_pow == 1)) {
 163         if (!env->pending_interrupts && (*env->check_pow)(env)) {
 164             cs->halted = 1;
 165             excp = EXCP_HALTED;
 166         }
 167     }
 168 #endif
 169
 170     return excp;
 171 }
 172
 173 #if !defined(CONFIG_USER_ONLY)
 174 static inline void check_tlb_flush(CPUPPCState *env, bool global)
 175 {
 176     CPUState *cs = CPU(ppc_env_get_cpu(env));
 177
 178     /* Handle global flushes first */
 179     if (global && (env->tlb_need_flush & TLB_NEED_GLOBAL_FLUSH)) {
 180         env->tlb_need_flush &= ~TLB_NEED_GLOBAL_FLUSH;
 181         env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
 182         tlb_flush_all_cpus_synced(cs);
 183         return;
 184     }
 185
 186     /* Then handle local ones */
 187     if (env->tlb_need_flush & TLB_NEED_LOCAL_FLUSH) {
 188         env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
 189         tlb_flush(cs);
 190     }
 191 }
 192 #else
 193 static inline void check_tlb_flush(CPUPPCState *env, bool global) { }
 194 #endif
 195
 196 #endif /* HELPER_REGS_H */