target-i386/machine.c

   1 #include "hw/hw.h"
   2 #include "hw/boards.h"
   3 #include "hw/pc.h"
   4 #include "hw/isa.h"
   5
   6 #include "exec-all.h"
   7
   8 void register_machines(void)
   9 {
  10     qemu_register_machine(&pc_machine);
  11     qemu_register_machine(&isapc_machine);
  12 }
  13
  14 static void cpu_put_seg(QEMUFile *f, SegmentCache *dt)
  15 {
  16     qemu_put_be32(f, dt->selector);
  17     qemu_put_betl(f, dt->base);
  18     qemu_put_be32(f, dt->limit);
  19     qemu_put_be32(f, dt->flags);
  20 }
  21
  22 static void cpu_get_seg(QEMUFile *f, SegmentCache *dt)
  23 {
  24     dt->selector = qemu_get_be32(f);
  25     dt->base = qemu_get_betl(f);
  26     dt->limit = qemu_get_be32(f);
  27     dt->flags = qemu_get_be32(f);
  28 }
  29
  30 void cpu_save(QEMUFile *f, void *opaque)
  31 {
  32     CPUState *env = opaque;
  33     uint16_t fptag, fpus, fpuc, fpregs_format;
  34     uint32_t hflags;
  35     int32_t a20_mask;
  36     int i;
  37
  38     for(i = 0; i < CPU_NB_REGS; i++)
  39         qemu_put_betls(f, &env->regs[i]);
  40     qemu_put_betls(f, &env->eip);
  41     qemu_put_betls(f, &env->eflags);
  42     hflags = env->hflags; /* XXX: suppress most of the redundant hflags */
  43     qemu_put_be32s(f, &hflags);
  44
  45     /* FPU */
  46     fpuc = env->fpuc;
  47     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
  48     fptag = 0;
  49     for(i = 0; i < 8; i++) {
  50         fptag |= ((!env->fptags[i]) << i);
  51     }
  52
  53     qemu_put_be16s(f, &fpuc);
  54     qemu_put_be16s(f, &fpus);
  55     qemu_put_be16s(f, &fptag);
  56
  57 #ifdef USE_X86LDOUBLE
  58     fpregs_format = 0;
  59 #else
  60     fpregs_format = 1;
  61 #endif
  62     qemu_put_be16s(f, &fpregs_format);
  63
  64     for(i = 0; i < 8; i++) {
  65 #ifdef USE_X86LDOUBLE
  66         {
  67             uint64_t mant;
  68             uint16_t exp;
  69             /* we save the real CPU data (in case of MMX usage only 'mant'
  70                contains the MMX register */
  71             cpu_get_fp80(&mant, &exp, env->fpregs[i].d);
  72             qemu_put_be64(f, mant);
  73             qemu_put_be16(f, exp);
  74         }
  75 #else
  76         /* if we use doubles for float emulation, we save the doubles to
  77            avoid losing information in case of MMX usage. It can give
  78            problems if the image is restored on a CPU where long
  79            doubles are used instead. */
  80         qemu_put_be64(f, env->fpregs[i].mmx.MMX_Q(0));
  81 #endif
  82     }
  83
  84     for(i = 0; i < 6; i++)
  85         cpu_put_seg(f, &env->segs[i]);
  86     cpu_put_seg(f, &env->ldt);
  87     cpu_put_seg(f, &env->tr);
  88     cpu_put_seg(f, &env->gdt);
  89     cpu_put_seg(f, &env->idt);
  90
  91     qemu_put_be32s(f, &env->sysenter_cs);
  92     qemu_put_be32s(f, &env->sysenter_esp);
  93     qemu_put_be32s(f, &env->sysenter_eip);
  94
  95     qemu_put_betls(f, &env->cr[0]);
  96     qemu_put_betls(f, &env->cr[2]);
  97     qemu_put_betls(f, &env->cr[3]);
  98     qemu_put_betls(f, &env->cr[4]);
  99
 100     for(i = 0; i < 8; i++)
 101         qemu_put_betls(f, &env->dr[i]);
 102
 103     /* MMU */
 104     a20_mask = (int32_t) env->a20_mask;
 105     qemu_put_be32s(f, &a20_mask);
 106
 107     /* XMM */
 108     qemu_put_be32s(f, &env->mxcsr);
 109     for(i = 0; i < CPU_NB_REGS; i++) {
 110         qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(0));
 111         qemu_put_be64s(f, &env->xmm_regs[i].XMM_Q(1));
 112     }
 113
 114 #ifdef TARGET_X86_64
 115     qemu_put_be64s(f, &env->efer);
 116     qemu_put_be64s(f, &env->star);
 117     qemu_put_be64s(f, &env->lstar);
 118     qemu_put_be64s(f, &env->cstar);
 119     qemu_put_be64s(f, &env->fmask);
 120     qemu_put_be64s(f, &env->kernelgsbase);
 121 #endif
 122     qemu_put_be32s(f, &env->smbase);
 123 }
 124
 125 #ifdef USE_X86LDOUBLE
 126 /* XXX: add that in a FPU generic layer */
 127 union x86_longdouble {
 128     uint64_t mant;
 129     uint16_t exp;
 130 };
 131
 132 #define MANTD1(fp)      (fp & ((1LL << 52) - 1))
 133 #define EXPBIAS1 1023
 134 #define EXPD1(fp)       ((fp >> 52) & 0x7FF)
 135 #define SIGND1(fp)      ((fp >> 32) & 0x80000000)
 136
 137 static void fp64_to_fp80(union x86_longdouble *p, uint64_t temp)
 138 {
 139     int e;
 140     /* mantissa */
 141     p->mant = (MANTD1(temp) << 11) | (1LL << 63);
 142     /* exponent + sign */
 143     e = EXPD1(temp) - EXPBIAS1 + 16383;
 144     e |= SIGND1(temp) >> 16;
 145     p->exp = e;
 146 }
 147 #endif
 148
 149 int cpu_load(QEMUFile *f, void *opaque, int version_id)
 150 {
 151     CPUState *env = opaque;
 152     int i, guess_mmx;
 153     uint32_t hflags;
 154     uint16_t fpus, fpuc, fptag, fpregs_format;
 155     int32_t a20_mask;
 156
 157     if (version_id != 3 && version_id != 4)
 158         return -EINVAL;
 159     for(i = 0; i < CPU_NB_REGS; i++)
 160         qemu_get_betls(f, &env->regs[i]);
 161     qemu_get_betls(f, &env->eip);
 162     qemu_get_betls(f, &env->eflags);
 163     qemu_get_be32s(f, &hflags);
 164
 165     qemu_get_be16s(f, &fpuc);
 166     qemu_get_be16s(f, &fpus);
 167     qemu_get_be16s(f, &fptag);
 168     qemu_get_be16s(f, &fpregs_format);
 169
 170     /* NOTE: we cannot always restore the FPU state if the image come
 171        from a host with a different 'USE_X86LDOUBLE' define. We guess
 172        if we are in an MMX state to restore correctly in that case. */
 173     guess_mmx = ((fptag == 0xff) && (fpus & 0x3800) == 0);
 174     for(i = 0; i < 8; i++) {
 175         uint64_t mant;
 176         uint16_t exp;
 177
 178         switch(fpregs_format) {
 179         case 0:
 180             mant = qemu_get_be64(f);
 181             exp = qemu_get_be16(f);
 182 #ifdef USE_X86LDOUBLE
 183             env->fpregs[i].d = cpu_set_fp80(mant, exp);
 184 #else
 185             /* difficult case */
 186             if (guess_mmx)
 187                 env->fpregs[i].mmx.MMX_Q(0) = mant;
 188             else
 189                 env->fpregs[i].d = cpu_set_fp80(mant, exp);
 190 #endif
 191             break;
 192         case 1:
 193             mant = qemu_get_be64(f);
 194 #ifdef USE_X86LDOUBLE
 195             {
 196                 union x86_longdouble *p;
 197                 /* difficult case */
 198                 p = (void *)&env->fpregs[i];
 199                 if (guess_mmx) {
 200                     p->mant = mant;
 201                     p->exp = 0xffff;
 202                 } else {
 203                     fp64_to_fp80(p, mant);
 204                 }
 205             }
 206 #else
 207             env->fpregs[i].mmx.MMX_Q(0) = mant;
 208 #endif
 209             break;
 210         default:
 211             return -EINVAL;
 212         }
 213     }
 214
 215     env->fpuc = fpuc;
 216     /* XXX: restore FPU round state */
 217     env->fpstt = (fpus >> 11) & 7;
 218     env->fpus = fpus & ~0x3800;
 219     fptag ^= 0xff;
 220     for(i = 0; i < 8; i++) {
 221         env->fptags[i] = (fptag >> i) & 1;
 222     }
 223
 224     for(i = 0; i < 6; i++)
 225         cpu_get_seg(f, &env->segs[i]);
 226     cpu_get_seg(f, &env->ldt);
 227     cpu_get_seg(f, &env->tr);
 228     cpu_get_seg(f, &env->gdt);
 229     cpu_get_seg(f, &env->idt);
 230
 231     qemu_get_be32s(f, &env->sysenter_cs);
 232     qemu_get_be32s(f, &env->sysenter_esp);
 233     qemu_get_be32s(f, &env->sysenter_eip);
 234
 235     qemu_get_betls(f, &env->cr[0]);
 236     qemu_get_betls(f, &env->cr[2]);
 237     qemu_get_betls(f, &env->cr[3]);
 238     qemu_get_betls(f, &env->cr[4]);
 239
 240     for(i = 0; i < 8; i++)
 241         qemu_get_betls(f, &env->dr[i]);
 242
 243     /* MMU */
 244     qemu_get_be32s(f, &a20_mask);
 245     env->a20_mask = a20_mask;
 246
 247     qemu_get_be32s(f, &env->mxcsr);
 248     for(i = 0; i < CPU_NB_REGS; i++) {
 249         qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(0));
 250         qemu_get_be64s(f, &env->xmm_regs[i].XMM_Q(1));
 251     }
 252
 253 #ifdef TARGET_X86_64
 254     qemu_get_be64s(f, &env->efer);
 255     qemu_get_be64s(f, &env->star);
 256     qemu_get_be64s(f, &env->lstar);
 257     qemu_get_be64s(f, &env->cstar);
 258     qemu_get_be64s(f, &env->fmask);
 259     qemu_get_be64s(f, &env->kernelgsbase);
 260 #endif
 261     if (version_id >= 4)
 262         qemu_get_be32s(f, &env->smbase);
 263
 264     /* XXX: compute hflags from scratch, except for CPL and IIF */
 265     env->hflags = hflags;
 266     tlb_flush(env, 1);
 267     return 0;
 268 }