LXR qemu/target/ppc/helper

   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 2.1 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#include "qemu/osdep.h"
  21#include "cpu.h"
  22#include "qemu/main-loop.h"
  23#include "exec/exec-all.h"
  24#include "sysemu/kvm.h"
  25#include "helper_regs.h"
  26
  27/* Swap temporary saved registers with GPRs */
  28void hreg_swap_gpr_tgpr(CPUPPCState *env)
  29{
  30    target_ulong tmp;
  31
  32    tmp = env->gpr[0];
  33    env->gpr[0] = env->tgpr[0];
  34    env->tgpr[0] = tmp;
  35    tmp = env->gpr[1];
  36    env->gpr[1] = env->tgpr[1];
  37    env->tgpr[1] = tmp;
  38    tmp = env->gpr[2];
  39    env->gpr[2] = env->tgpr[2];
  40    env->tgpr[2] = tmp;
  41    tmp = env->gpr[3];
  42    env->gpr[3] = env->tgpr[3];
  43    env->tgpr[3] = tmp;
  44}
  45
  46static uint32_t hreg_compute_hflags_value(CPUPPCState *env)
  47{
  48    target_ulong msr = env->msr;
  49    uint32_t ppc_flags = env->flags;
  50    uint32_t hflags = 0;
  51    uint32_t msr_mask;
  52
  53    /* Some bits come straight across from MSR. */
  54    QEMU_BUILD_BUG_ON(MSR_LE != HFLAGS_LE);
  55    QEMU_BUILD_BUG_ON(MSR_PR != HFLAGS_PR);
  56    QEMU_BUILD_BUG_ON(MSR_DR != HFLAGS_DR);
  57    QEMU_BUILD_BUG_ON(MSR_FP != HFLAGS_FP);
  58    msr_mask = ((1 << MSR_LE) | (1 << MSR_PR) |
  59                (1 << MSR_DR) | (1 << MSR_FP));
  60
  61    if (ppc_flags & POWERPC_FLAG_HID0_LE) {
  62        /*
  63         * Note that MSR_LE is not set in env->msr_mask for this cpu,
  64         * and so will never be set in msr.
  65         */
  66        uint32_t le = extract32(env->spr[SPR_HID0], 3, 1);
  67        hflags |= le << MSR_LE;
  68    }
  69
  70    if (ppc_flags & POWERPC_FLAG_DE) {
  71        target_ulong dbcr0 = env->spr[SPR_BOOKE_DBCR0];
  72        if (dbcr0 & DBCR0_ICMP) {
  73            hflags |= 1 << HFLAGS_SE;
  74        }
  75        if (dbcr0 & DBCR0_BRT) {
  76            hflags |= 1 << HFLAGS_BE;
  77        }
  78    } else {
  79        if (ppc_flags & POWERPC_FLAG_BE) {
  80            QEMU_BUILD_BUG_ON(MSR_BE != HFLAGS_BE);
  81            msr_mask |= 1 << MSR_BE;
  82        }
  83        if (ppc_flags & POWERPC_FLAG_SE) {
  84            QEMU_BUILD_BUG_ON(MSR_SE != HFLAGS_SE);
  85            msr_mask |= 1 << MSR_SE;
  86        }
  87    }
  88
  89    if (msr_is_64bit(env, msr)) {
  90        hflags |= 1 << HFLAGS_64;
  91    }
  92    if ((ppc_flags & POWERPC_FLAG_SPE) && (msr & (1 << MSR_SPE))) {
  93        hflags |= 1 << HFLAGS_SPE;
  94    }
  95    if (ppc_flags & POWERPC_FLAG_VRE) {
  96        QEMU_BUILD_BUG_ON(MSR_VR != HFLAGS_VR);
  97        msr_mask |= 1 << MSR_VR;
  98    }
  99    if (ppc_flags & POWERPC_FLAG_VSX) {
 100        QEMU_BUILD_BUG_ON(MSR_VSX != HFLAGS_VSX);
 101        msr_mask |= 1 << MSR_VSX;
 102    }
 103    if ((ppc_flags & POWERPC_FLAG_TM) && (msr & (1ull << MSR_TM))) {
 104        hflags |= 1 << HFLAGS_TM;
 105    }
 106    if (env->spr[SPR_LPCR] & LPCR_GTSE) {
 107        hflags |= 1 << HFLAGS_GTSE;
 108    }
 109
 110#ifndef CONFIG_USER_ONLY
 111    if (!env->has_hv_mode || (msr & (1ull << MSR_HV))) {
 112        hflags |= 1 << HFLAGS_HV;
 113    }
 114
 115    /*
 116     * This is our encoding for server processors. The architecture
 117     * specifies that there is no such thing as userspace with
 118     * translation off, however it appears that MacOS does it and some
 119     * 32-bit CPUs support it. Weird...
 120     *
 121     *   0 = Guest User space virtual mode
 122     *   1 = Guest Kernel space virtual mode
 123     *   2 = Guest User space real mode
 124     *   3 = Guest Kernel space real mode
 125     *   4 = HV User space virtual mode
 126     *   5 = HV Kernel space virtual mode
 127     *   6 = HV User space real mode
 128     *   7 = HV Kernel space real mode
 129     *
 130     * For BookE, we need 8 MMU modes as follow:
 131     *
 132     *  0 = AS 0 HV User space
 133     *  1 = AS 0 HV Kernel space
 134     *  2 = AS 1 HV User space
 135     *  3 = AS 1 HV Kernel space
 136     *  4 = AS 0 Guest User space
 137     *  5 = AS 0 Guest Kernel space
 138     *  6 = AS 1 Guest User space
 139     *  7 = AS 1 Guest Kernel space
 140     */
 141    unsigned immu_idx, dmmu_idx;
 142    dmmu_idx = msr & (1 << MSR_PR) ? 0 : 1;
 143    if (env->mmu_model & POWERPC_MMU_BOOKE) {
 144        dmmu_idx |= msr & (1 << MSR_GS) ? 4 : 0;
 145        immu_idx = dmmu_idx;
 146        immu_idx |= msr & (1 << MSR_IS) ? 2 : 0;
 147        dmmu_idx |= msr & (1 << MSR_DS) ? 2 : 0;
 148    } else {
 149        dmmu_idx |= msr & (1ull << MSR_HV) ? 4 : 0;
 150        immu_idx = dmmu_idx;
 151        immu_idx |= msr & (1 << MSR_IR) ? 0 : 2;
 152        dmmu_idx |= msr & (1 << MSR_DR) ? 0 : 2;
 153    }
 154    hflags |= immu_idx << HFLAGS_IMMU_IDX;
 155    hflags |= dmmu_idx << HFLAGS_DMMU_IDX;
 156#endif
 157
 158    return hflags | (msr & msr_mask);
 159}
 160
 161void hreg_compute_hflags(CPUPPCState *env)
 162{
 163    env->hflags = hreg_compute_hflags_value(env);
 164}
 165
 166#ifdef CONFIG_DEBUG_TCG
 167void cpu_get_tb_cpu_state(CPUPPCState *env, target_ulong *pc,
 168                          target_ulong *cs_base, uint32_t *flags)
 169{
 170    uint32_t hflags_current = env->hflags;
 171    uint32_t hflags_rebuilt;
 172
 173    *pc = env->nip;
 174    *cs_base = 0;
 175    *flags = hflags_current;
 176
 177    hflags_rebuilt = hreg_compute_hflags_value(env);
 178    if (unlikely(hflags_current != hflags_rebuilt)) {
 179        cpu_abort(env_cpu(env),
 180                  "TCG hflags mismatch (current:0x%08x rebuilt:0x%08x)\n",
 181                  hflags_current, hflags_rebuilt);
 182    }
 183}
 184#endif
 185
 186void cpu_interrupt_exittb(CPUState *cs)
 187{
 188    if (!kvm_enabled()) {
 189        return;
 190    }
 191
 192    if (!qemu_mutex_iothread_locked()) {
 193        qemu_mutex_lock_iothread();
 194        cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
 195        qemu_mutex_unlock_iothread();
 196    } else {
 197        cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
 198    }
 199}
 200
 201int hreg_store_msr(CPUPPCState *env, target_ulong value, int alter_hv)
 202{
 203    int excp;
 204#if !defined(CONFIG_USER_ONLY)
 205    CPUState *cs = env_cpu(env);
 206#endif
 207
 208    excp = 0;
 209    value &= env->msr_mask;
 210#if !defined(CONFIG_USER_ONLY)
 211    /* Neither mtmsr nor guest state can alter HV */
 212    if (!alter_hv || !(env->msr & MSR_HVB)) {
 213        value &= ~MSR_HVB;
 214        value |= env->msr & MSR_HVB;
 215    }
 216    if (((value >> MSR_IR) & 1) != msr_ir ||
 217        ((value >> MSR_DR) & 1) != msr_dr) {
 218        cpu_interrupt_exittb(cs);
 219    }
 220    if ((env->mmu_model & POWERPC_MMU_BOOKE) &&
 221        ((value >> MSR_GS) & 1) != msr_gs) {
 222        cpu_interrupt_exittb(cs);
 223    }
 224    if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
 225                 ((value ^ env->msr) & (1 << MSR_TGPR)))) {
 226        /* Swap temporary saved registers with GPRs */
 227        hreg_swap_gpr_tgpr(env);
 228    }
 229    if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
 230        /* Change the exception prefix on PowerPC 601 */
 231        env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
 232    }
 233    /*
 234     * If PR=1 then EE, IR and DR must be 1
 235     *
 236     * Note: We only enforce this on 64-bit server processors.
 237     * It appears that:
 238     * - 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
 239     *   exploits it.
 240     * - 64-bit embedded implementations do not need any operation to be
 241     *   performed when PR is set.
 242     */
 243    if (is_book3s_arch2x(env) && ((value >> MSR_PR) & 1)) {
 244        value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
 245    }
 246#endif
 247    env->msr = value;
 248    hreg_compute_hflags(env);
 249#if !defined(CONFIG_USER_ONLY)
 250    if (unlikely(msr_pow == 1)) {
 251        if (!env->pending_interrupts && (*env->check_pow)(env)) {
 252            cs->halted = 1;
 253            excp = EXCP_HALTED;
 254        }
 255    }
 256#endif
 257
 258    return excp;
 259}
 260
 261#ifndef CONFIG_USER_ONLY
 262void check_tlb_flush(CPUPPCState *env, bool global)
 263{
 264    CPUState *cs = env_cpu(env);
 265
 266    /* Handle global flushes first */
 267    if (global && (env->tlb_need_flush & TLB_NEED_GLOBAL_FLUSH)) {
 268        env->tlb_need_flush &= ~TLB_NEED_GLOBAL_FLUSH;
 269        env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
 270        tlb_flush_all_cpus_synced(cs);
 271        return;
 272    }
 273
 274    /* Then handle local ones */
 275    if (env->tlb_need_flush & TLB_NEED_LOCAL_FLUSH) {
 276        env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
 277        tlb_flush(cs);
 278    }
 279}
 280#endif
 281