hw/alpha/typhoon.c

   1 /*
   2  * DEC 21272 (TSUNAMI/TYPHOON) chipset emulation.
   3  *
   4  * Written by Richard Henderson.
   5  *
   6  * This work is licensed under the GNU GPL license version 2 or later.
   7  */
   8
   9 #include "qemu/osdep.h"
  10 #include "qapi/error.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "hw/devices.h"
  14 #include "sysemu/sysemu.h"
  15 #include "alpha_sys.h"
  16 #include "exec/address-spaces.h"
  17
  18
  19 #define TYPE_TYPHOON_PCI_HOST_BRIDGE "typhoon-pcihost"
  20
  21 typedef struct TyphoonCchip {
  22     MemoryRegion region;
  23     uint64_t misc;
  24     uint64_t drir;
  25     uint64_t dim[4];
  26     uint32_t iic[4];
  27     AlphaCPU *cpu[4];
  28 } TyphoonCchip;
  29
  30 typedef struct TyphoonWindow {
  31     uint64_t wba;
  32     uint64_t wsm;
  33     uint64_t tba;
  34 } TyphoonWindow;
  35
  36 typedef struct TyphoonPchip {
  37     MemoryRegion region;
  38     MemoryRegion reg_iack;
  39     MemoryRegion reg_mem;
  40     MemoryRegion reg_io;
  41     MemoryRegion reg_conf;
  42
  43     AddressSpace iommu_as;
  44     MemoryRegion iommu;
  45
  46     uint64_t ctl;
  47     TyphoonWindow win[4];
  48 } TyphoonPchip;
  49
  50 #define TYPHOON_PCI_HOST_BRIDGE(obj) \
  51     OBJECT_CHECK(TyphoonState, (obj), TYPE_TYPHOON_PCI_HOST_BRIDGE)
  52
  53 typedef struct TyphoonState {
  54     PCIHostState parent_obj;
  55
  56     TyphoonCchip cchip;
  57     TyphoonPchip pchip;
  58     MemoryRegion dchip_region;
  59     MemoryRegion ram_region;
  60 } TyphoonState;
  61
  62 /* Called when one of DRIR or DIM changes.  */
  63 static void cpu_irq_change(AlphaCPU *cpu, uint64_t req)
  64 {
  65     /* If there are any non-masked interrupts, tell the cpu.  */
  66     if (cpu != NULL) {
  67         CPUState *cs = CPU(cpu);
  68         if (req) {
  69             cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  70         } else {
  71             cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  72         }
  73     }
  74 }
  75
  76 static uint64_t cchip_read(void *opaque, hwaddr addr, unsigned size)
  77 {
  78     CPUState *cpu = current_cpu;
  79     TyphoonState *s = opaque;
  80     uint64_t ret = 0;
  81
  82     switch (addr) {
  83     case 0x0000:
  84         /* CSC: Cchip System Configuration Register.  */
  85         /* All sorts of data here; probably the only thing relevant is
  86            PIP<14> Pchip 1 Present = 0.  */
  87         break;
  88
  89     case 0x0040:
  90         /* MTR: Memory Timing Register.  */
  91         /* All sorts of stuff related to real DRAM.  */
  92         break;
  93
  94     case 0x0080:
  95         /* MISC: Miscellaneous Register.  */
  96         ret = s->cchip.misc | (cpu->cpu_index & 3);
  97         break;
  98
  99     case 0x00c0:
 100         /* MPD: Memory Presence Detect Register.  */
 101         break;
 102
 103     case 0x0100: /* AAR0 */
 104     case 0x0140: /* AAR1 */
 105     case 0x0180: /* AAR2 */
 106     case 0x01c0: /* AAR3 */
 107         /* AAR: Array Address Register.  */
 108         /* All sorts of information about DRAM.  */
 109         break;
 110
 111     case 0x0200:
 112         /* DIM0: Device Interrupt Mask Register, CPU0.  */
 113         ret = s->cchip.dim[0];
 114         break;
 115     case 0x0240:
 116         /* DIM1: Device Interrupt Mask Register, CPU1.  */
 117         ret = s->cchip.dim[1];
 118         break;
 119     case 0x0280:
 120         /* DIR0: Device Interrupt Request Register, CPU0.  */
 121         ret = s->cchip.dim[0] & s->cchip.drir;
 122         break;
 123     case 0x02c0:
 124         /* DIR1: Device Interrupt Request Register, CPU1.  */
 125         ret = s->cchip.dim[1] & s->cchip.drir;
 126         break;
 127     case 0x0300:
 128         /* DRIR: Device Raw Interrupt Request Register.  */
 129         ret = s->cchip.drir;
 130         break;
 131
 132     case 0x0340:
 133         /* PRBEN: Probe Enable Register.  */
 134         break;
 135
 136     case 0x0380:
 137         /* IIC0: Interval Ignore Count Register, CPU0.  */
 138         ret = s->cchip.iic[0];
 139         break;
 140     case 0x03c0:
 141         /* IIC1: Interval Ignore Count Register, CPU1.  */
 142         ret = s->cchip.iic[1];
 143         break;
 144
 145     case 0x0400: /* MPR0 */
 146     case 0x0440: /* MPR1 */
 147     case 0x0480: /* MPR2 */
 148     case 0x04c0: /* MPR3 */
 149         /* MPR: Memory Programming Register.  */
 150         break;
 151
 152     case 0x0580:
 153         /* TTR: TIGbus Timing Register.  */
 154         /* All sorts of stuff related to interrupt delivery timings.  */
 155         break;
 156     case 0x05c0:
 157         /* TDR: TIGbug Device Timing Register.  */
 158         break;
 159
 160     case 0x0600:
 161         /* DIM2: Device Interrupt Mask Register, CPU2.  */
 162         ret = s->cchip.dim[2];
 163         break;
 164     case 0x0640:
 165         /* DIM3: Device Interrupt Mask Register, CPU3.  */
 166         ret = s->cchip.dim[3];
 167         break;
 168     case 0x0680:
 169         /* DIR2: Device Interrupt Request Register, CPU2.  */
 170         ret = s->cchip.dim[2] & s->cchip.drir;
 171         break;
 172     case 0x06c0:
 173         /* DIR3: Device Interrupt Request Register, CPU3.  */
 174         ret = s->cchip.dim[3] & s->cchip.drir;
 175         break;
 176
 177     case 0x0700:
 178         /* IIC2: Interval Ignore Count Register, CPU2.  */
 179         ret = s->cchip.iic[2];
 180         break;
 181     case 0x0740:
 182         /* IIC3: Interval Ignore Count Register, CPU3.  */
 183         ret = s->cchip.iic[3];
 184         break;
 185
 186     case 0x0780:
 187         /* PWR: Power Management Control.   */
 188         break;
 189
 190     case 0x0c00: /* CMONCTLA */
 191     case 0x0c40: /* CMONCTLB */
 192     case 0x0c80: /* CMONCNT01 */
 193     case 0x0cc0: /* CMONCNT23 */
 194         break;
 195
 196     default:
 197         cpu_unassigned_access(cpu, addr, false, false, 0, size);
 198         return -1;
 199     }
 200
 201     return ret;
 202 }
 203
 204 static uint64_t dchip_read(void *opaque, hwaddr addr, unsigned size)
 205 {
 206     /* Skip this.  It's all related to DRAM timing and setup.  */
 207     return 0;
 208 }
 209
 210 static uint64_t pchip_read(void *opaque, hwaddr addr, unsigned size)
 211 {
 212     TyphoonState *s = opaque;
 213     uint64_t ret = 0;
 214
 215     switch (addr) {
 216     case 0x0000:
 217         /* WSBA0: Window Space Base Address Register.  */
 218         ret = s->pchip.win[0].wba;
 219         break;
 220     case 0x0040:
 221         /* WSBA1 */
 222         ret = s->pchip.win[1].wba;
 223         break;
 224     case 0x0080:
 225         /* WSBA2 */
 226         ret = s->pchip.win[2].wba;
 227         break;
 228     case 0x00c0:
 229         /* WSBA3 */
 230         ret = s->pchip.win[3].wba;
 231         break;
 232
 233     case 0x0100:
 234         /* WSM0: Window Space Mask Register.  */
 235         ret = s->pchip.win[0].wsm;
 236         break;
 237     case 0x0140:
 238         /* WSM1 */
 239         ret = s->pchip.win[1].wsm;
 240         break;
 241     case 0x0180:
 242         /* WSM2 */
 243         ret = s->pchip.win[2].wsm;
 244         break;
 245     case 0x01c0:
 246         /* WSM3 */
 247         ret = s->pchip.win[3].wsm;
 248         break;
 249
 250     case 0x0200:
 251         /* TBA0: Translated Base Address Register.  */
 252         ret = s->pchip.win[0].tba;
 253         break;
 254     case 0x0240:
 255         /* TBA1 */
 256         ret = s->pchip.win[1].tba;
 257         break;
 258     case 0x0280:
 259         /* TBA2 */
 260         ret = s->pchip.win[2].tba;
 261         break;
 262     case 0x02c0:
 263         /* TBA3 */
 264         ret = s->pchip.win[3].tba;
 265         break;
 266
 267     case 0x0300:
 268         /* PCTL: Pchip Control Register.  */
 269         ret = s->pchip.ctl;
 270         break;
 271     case 0x0340:
 272         /* PLAT: Pchip Master Latency Register.  */
 273         break;
 274     case 0x03c0:
 275         /* PERROR: Pchip Error Register.  */
 276         break;
 277     case 0x0400:
 278         /* PERRMASK: Pchip Error Mask Register.  */
 279         break;
 280     case 0x0440:
 281         /* PERRSET: Pchip Error Set Register.  */
 282         break;
 283     case 0x0480:
 284         /* TLBIV: Translation Buffer Invalidate Virtual Register (WO).  */
 285         break;
 286     case 0x04c0:
 287         /* TLBIA: Translation Buffer Invalidate All Register (WO).  */
 288         break;
 289     case 0x0500: /* PMONCTL */
 290     case 0x0540: /* PMONCNT */
 291     case 0x0800: /* SPRST */
 292         break;
 293
 294     default:
 295         cpu_unassigned_access(current_cpu, addr, false, false, 0, size);
 296         return -1;
 297     }
 298
 299     return ret;
 300 }
 301
 302 static void cchip_write(void *opaque, hwaddr addr,
 303                         uint64_t val, unsigned size)
 304 {
 305     TyphoonState *s = opaque;
 306     uint64_t oldval, newval;
 307
 308     switch (addr) {
 309     case 0x0000:
 310         /* CSC: Cchip System Configuration Register.  */
 311         /* All sorts of data here; nothing relevant RW.  */
 312         break;
 313
 314     case 0x0040:
 315         /* MTR: Memory Timing Register.  */
 316         /* All sorts of stuff related to real DRAM.  */
 317         break;
 318
 319     case 0x0080:
 320         /* MISC: Miscellaneous Register.  */
 321         newval = oldval = s->cchip.misc;
 322         newval &= ~(val & 0x10000ff0);     /* W1C fields */
 323         if (val & 0x100000) {
 324             newval &= ~0xff0000ull;        /* ACL clears ABT and ABW */
 325         } else {
 326             newval |= val & 0x00f00000;    /* ABT field is W1S */
 327             if ((newval & 0xf0000) == 0) {
 328                 newval |= val & 0xf0000;   /* ABW field is W1S iff zero */
 329             }
 330         }
 331         newval |= (val & 0xf000) >> 4;     /* IPREQ field sets IPINTR.  */
 332
 333         newval &= ~0xf0000000000ull;       /* WO and RW fields */
 334         newval |= val & 0xf0000000000ull;
 335         s->cchip.misc = newval;
 336
 337         /* Pass on changes to IPI and ITI state.  */
 338         if ((newval ^ oldval) & 0xff0) {
 339             int i;
 340             for (i = 0; i < 4; ++i) {
 341                 AlphaCPU *cpu = s->cchip.cpu[i];
 342                 if (cpu != NULL) {
 343                     CPUState *cs = CPU(cpu);
 344                     /* IPI can be either cleared or set by the write.  */
 345                     if (newval & (1 << (i + 8))) {
 346                         cpu_interrupt(cs, CPU_INTERRUPT_SMP);
 347                     } else {
 348                         cpu_reset_interrupt(cs, CPU_INTERRUPT_SMP);
 349                     }
 350
 351                     /* ITI can only be cleared by the write.  */
 352                     if ((newval & (1 << (i + 4))) == 0) {
 353                         cpu_reset_interrupt(cs, CPU_INTERRUPT_TIMER);
 354                     }
 355                 }
 356             }
 357         }
 358         break;
 359
 360     case 0x00c0:
 361         /* MPD: Memory Presence Detect Register.  */
 362         break;
 363
 364     case 0x0100: /* AAR0 */
 365     case 0x0140: /* AAR1 */
 366     case 0x0180: /* AAR2 */
 367     case 0x01c0: /* AAR3 */
 368         /* AAR: Array Address Register.  */
 369         /* All sorts of information about DRAM.  */
 370         break;
 371
 372     case 0x0200: /* DIM0 */
 373         /* DIM: Device Interrupt Mask Register, CPU0.  */
 374         s->cchip.dim[0] = val;
 375         cpu_irq_change(s->cchip.cpu[0], val & s->cchip.drir);
 376         break;
 377     case 0x0240: /* DIM1 */
 378         /* DIM: Device Interrupt Mask Register, CPU1.  */
 379         s->cchip.dim[0] = val;
 380         cpu_irq_change(s->cchip.cpu[1], val & s->cchip.drir);
 381         break;
 382
 383     case 0x0280: /* DIR0 (RO) */
 384     case 0x02c0: /* DIR1 (RO) */
 385     case 0x0300: /* DRIR (RO) */
 386         break;
 387
 388     case 0x0340:
 389         /* PRBEN: Probe Enable Register.  */
 390         break;
 391
 392     case 0x0380: /* IIC0 */
 393         s->cchip.iic[0] = val & 0xffffff;
 394         break;
 395     case 0x03c0: /* IIC1 */
 396         s->cchip.iic[1] = val & 0xffffff;
 397         break;
 398
 399     case 0x0400: /* MPR0 */
 400     case 0x0440: /* MPR1 */
 401     case 0x0480: /* MPR2 */
 402     case 0x04c0: /* MPR3 */
 403         /* MPR: Memory Programming Register.  */
 404         break;
 405
 406     case 0x0580:
 407         /* TTR: TIGbus Timing Register.  */
 408         /* All sorts of stuff related to interrupt delivery timings.  */
 409         break;
 410     case 0x05c0:
 411         /* TDR: TIGbug Device Timing Register.  */
 412         break;
 413
 414     case 0x0600:
 415         /* DIM2: Device Interrupt Mask Register, CPU2.  */
 416         s->cchip.dim[2] = val;
 417         cpu_irq_change(s->cchip.cpu[2], val & s->cchip.drir);
 418         break;
 419     case 0x0640:
 420         /* DIM3: Device Interrupt Mask Register, CPU3.  */
 421         s->cchip.dim[3] = val;
 422         cpu_irq_change(s->cchip.cpu[3], val & s->cchip.drir);
 423         break;
 424
 425     case 0x0680: /* DIR2 (RO) */
 426     case 0x06c0: /* DIR3 (RO) */
 427         break;
 428
 429     case 0x0700: /* IIC2 */
 430         s->cchip.iic[2] = val & 0xffffff;
 431         break;
 432     case 0x0740: /* IIC3 */
 433         s->cchip.iic[3] = val & 0xffffff;
 434         break;
 435
 436     case 0x0780:
 437         /* PWR: Power Management Control.   */
 438         break;
 439
 440     case 0x0c00: /* CMONCTLA */
 441     case 0x0c40: /* CMONCTLB */
 442     case 0x0c80: /* CMONCNT01 */
 443     case 0x0cc0: /* CMONCNT23 */
 444         break;
 445
 446     default:
 447         cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
 448         return;
 449     }
 450 }
 451
 452 static void dchip_write(void *opaque, hwaddr addr,
 453                         uint64_t val, unsigned size)
 454 {
 455     /* Skip this.  It's all related to DRAM timing and setup.  */
 456 }
 457
 458 static void pchip_write(void *opaque, hwaddr addr,
 459                         uint64_t val, unsigned size)
 460 {
 461     TyphoonState *s = opaque;
 462     uint64_t oldval;
 463
 464     switch (addr) {
 465     case 0x0000:
 466         /* WSBA0: Window Space Base Address Register.  */
 467         s->pchip.win[0].wba = val & 0xfff00003u;
 468         break;
 469     case 0x0040:
 470         /* WSBA1 */
 471         s->pchip.win[1].wba = val & 0xfff00003u;
 472         break;
 473     case 0x0080:
 474         /* WSBA2 */
 475         s->pchip.win[2].wba = val & 0xfff00003u;
 476         break;
 477     case 0x00c0:
 478         /* WSBA3 */
 479         s->pchip.win[3].wba = (val & 0x80fff00001ull) | 2;
 480         break;
 481
 482     case 0x0100:
 483         /* WSM0: Window Space Mask Register.  */
 484         s->pchip.win[0].wsm = val & 0xfff00000u;
 485         break;
 486     case 0x0140:
 487         /* WSM1 */
 488         s->pchip.win[1].wsm = val & 0xfff00000u;
 489         break;
 490     case 0x0180:
 491         /* WSM2 */
 492         s->pchip.win[2].wsm = val & 0xfff00000u;
 493         break;
 494     case 0x01c0:
 495         /* WSM3 */
 496         s->pchip.win[3].wsm = val & 0xfff00000u;
 497         break;
 498
 499     case 0x0200:
 500         /* TBA0: Translated Base Address Register.  */
 501         s->pchip.win[0].tba = val & 0x7fffffc00ull;
 502         break;
 503     case 0x0240:
 504         /* TBA1 */
 505         s->pchip.win[1].tba = val & 0x7fffffc00ull;
 506         break;
 507     case 0x0280:
 508         /* TBA2 */
 509         s->pchip.win[2].tba = val & 0x7fffffc00ull;
 510         break;
 511     case 0x02c0:
 512         /* TBA3 */
 513         s->pchip.win[3].tba = val & 0x7fffffc00ull;
 514         break;
 515
 516     case 0x0300:
 517         /* PCTL: Pchip Control Register.  */
 518         oldval = s->pchip.ctl;
 519         oldval &= ~0x00001cff0fc7ffull;       /* RW fields */
 520         oldval |= val & 0x00001cff0fc7ffull;
 521         s->pchip.ctl = oldval;
 522         break;
 523
 524     case 0x0340:
 525         /* PLAT: Pchip Master Latency Register.  */
 526         break;
 527     case 0x03c0:
 528         /* PERROR: Pchip Error Register.  */
 529         break;
 530     case 0x0400:
 531         /* PERRMASK: Pchip Error Mask Register.  */
 532         break;
 533     case 0x0440:
 534         /* PERRSET: Pchip Error Set Register.  */
 535         break;
 536
 537     case 0x0480:
 538         /* TLBIV: Translation Buffer Invalidate Virtual Register.  */
 539         break;
 540
 541     case 0x04c0:
 542         /* TLBIA: Translation Buffer Invalidate All Register (WO).  */
 543         break;
 544
 545     case 0x0500:
 546         /* PMONCTL */
 547     case 0x0540:
 548         /* PMONCNT */
 549     case 0x0800:
 550         /* SPRST */
 551         break;
 552
 553     default:
 554         cpu_unassigned_access(current_cpu, addr, true, false, 0, size);
 555         return;
 556     }
 557 }
 558
 559 static const MemoryRegionOps cchip_ops = {
 560     .read = cchip_read,
 561     .write = cchip_write,
 562     .endianness = DEVICE_LITTLE_ENDIAN,
 563     .valid = {
 564         .min_access_size = 8,
 565         .max_access_size = 8,
 566     },
 567     .impl = {
 568         .min_access_size = 8,
 569         .max_access_size = 8,
 570     },
 571 };
 572
 573 static const MemoryRegionOps dchip_ops = {
 574     .read = dchip_read,
 575     .write = dchip_write,
 576     .endianness = DEVICE_LITTLE_ENDIAN,
 577     .valid = {
 578         .min_access_size = 8,
 579         .max_access_size = 8,
 580     },
 581     .impl = {
 582         .min_access_size = 8,
 583         .max_access_size = 8,
 584     },
 585 };
 586
 587 static const MemoryRegionOps pchip_ops = {
 588     .read = pchip_read,
 589     .write = pchip_write,
 590     .endianness = DEVICE_LITTLE_ENDIAN,
 591     .valid = {
 592         .min_access_size = 8,
 593         .max_access_size = 8,
 594     },
 595     .impl = {
 596         .min_access_size = 8,
 597         .max_access_size = 8,
 598     },
 599 };
 600
 601 /* A subroutine of typhoon_translate_iommu that builds an IOMMUTLBEntry
 602    using the given translated address and mask.  */
 603 static bool make_iommu_tlbe(hwaddr taddr, hwaddr mask, IOMMUTLBEntry *ret)
 604 {
 605     *ret = (IOMMUTLBEntry) {
 606         .target_as = &address_space_memory,
 607         .translated_addr = taddr,
 608         .addr_mask = mask,
 609         .perm = IOMMU_RW,
 610     };
 611     return true;
 612 }
 613
 614 /* A subroutine of typhoon_translate_iommu that handles scatter-gather
 615    translation, given the address of the PTE.  */
 616 static bool pte_translate(hwaddr pte_addr, IOMMUTLBEntry *ret)
 617 {
 618     uint64_t pte = address_space_ldq(&address_space_memory, pte_addr,
 619                                      MEMTXATTRS_UNSPECIFIED, NULL);
 620
 621     /* Check valid bit.  */
 622     if ((pte & 1) == 0) {
 623         return false;
 624     }
 625
 626     return make_iommu_tlbe((pte & 0x3ffffe) << 12, 0x1fff, ret);
 627 }
 628
 629 /* A subroutine of typhoon_translate_iommu that handles one of the
 630    four single-address-cycle translation windows.  */
 631 static bool window_translate(TyphoonWindow *win, hwaddr addr,
 632                              IOMMUTLBEntry *ret)
 633 {
 634     uint32_t wba = win->wba;
 635     uint64_t wsm = win->wsm;
 636     uint64_t tba = win->tba;
 637     uint64_t wsm_ext = wsm | 0xfffff;
 638
 639     /* Check for window disabled.  */
 640     if ((wba & 1) == 0) {
 641         return false;
 642     }
 643
 644     /* Check for window hit.  */
 645     if ((addr & ~wsm_ext) != (wba & 0xfff00000u)) {
 646         return false;
 647     }
 648
 649     if (wba & 2) {
 650         /* Scatter-gather translation.  */
 651         hwaddr pte_addr;
 652
 653         /* See table 10-6, Generating PTE address for PCI DMA Address.  */
 654         pte_addr  = tba & ~(wsm >> 10);
 655         pte_addr |= (addr & (wsm | 0xfe000)) >> 10;
 656         return pte_translate(pte_addr, ret);
 657     } else {
 658         /* Direct-mapped translation.  */
 659         return make_iommu_tlbe(tba & ~wsm_ext, wsm_ext, ret);
 660     }
 661 }
 662
 663 /* Handle PCI-to-system address translation.  */
 664 /* TODO: A translation failure here ought to set PCI error codes on the
 665    Pchip and generate a machine check interrupt.  */
 666 static IOMMUTLBEntry typhoon_translate_iommu(MemoryRegion *iommu, hwaddr addr,
 667                                              bool is_write)
 668 {
 669     TyphoonPchip *pchip = container_of(iommu, TyphoonPchip, iommu);
 670     IOMMUTLBEntry ret;
 671     int i;
 672
 673     if (addr <= 0xffffffffu) {
 674         /* Single-address cycle.  */
 675
 676         /* Check for the Window Hole, inhibiting matching.  */
 677         if ((pchip->ctl & 0x20)
 678             && addr >= 0x80000
 679             && addr <= 0xfffff) {
 680             goto failure;
 681         }
 682
 683         /* Check the first three windows.  */
 684         for (i = 0; i < 3; ++i) {
 685             if (window_translate(&pchip->win[i], addr, &ret)) {
 686                 goto success;
 687             }
 688         }
 689
 690         /* Check the fourth window for DAC disable.  */
 691         if ((pchip->win[3].wba & 0x80000000000ull) == 0
 692             && window_translate(&pchip->win[3], addr, &ret)) {
 693             goto success;
 694         }
 695     } else {
 696         /* Double-address cycle.  */
 697
 698         if (addr >= 0x10000000000ull && addr < 0x20000000000ull) {
 699             /* Check for the DMA monster window.  */
 700             if (pchip->ctl & 0x40) {
 701                 /* See 10.1.4.4; in particular <39:35> is ignored.  */
 702                 make_iommu_tlbe(0, 0x007ffffffffull, &ret);
 703                 goto success;
 704             }
 705         }
 706
 707         if (addr >= 0x80000000000ull && addr <= 0xfffffffffffull) {
 708             /* Check the fourth window for DAC enable and window enable.  */
 709             if ((pchip->win[3].wba & 0x80000000001ull) == 0x80000000001ull) {
 710                 uint64_t pte_addr;
 711
 712                 pte_addr  = pchip->win[3].tba & 0x7ffc00000ull;
 713                 pte_addr |= (addr & 0xffffe000u) >> 10;
 714                 if (pte_translate(pte_addr, &ret)) {
 715                         goto success;
 716                 }
 717             }
 718         }
 719     }
 720
 721  failure:
 722     ret = (IOMMUTLBEntry) { .perm = IOMMU_NONE };
 723  success:
 724     return ret;
 725 }
 726
 727 static const MemoryRegionIOMMUOps typhoon_iommu_ops = {
 728     .translate = typhoon_translate_iommu,
 729 };
 730
 731 static AddressSpace *typhoon_pci_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 732 {
 733     TyphoonState *s = opaque;
 734     return &s->pchip.iommu_as;
 735 }
 736
 737 static void typhoon_set_irq(void *opaque, int irq, int level)
 738 {
 739     TyphoonState *s = opaque;
 740     uint64_t drir;
 741     int i;
 742
 743     /* Set/Reset the bit in CCHIP.DRIR based on IRQ+LEVEL.  */
 744     drir = s->cchip.drir;
 745     if (level) {
 746         drir |= 1ull << irq;
 747     } else {
 748         drir &= ~(1ull << irq);
 749     }
 750     s->cchip.drir = drir;
 751
 752     for (i = 0; i < 4; ++i) {
 753         cpu_irq_change(s->cchip.cpu[i], s->cchip.dim[i] & drir);
 754     }
 755 }
 756
 757 static void typhoon_set_isa_irq(void *opaque, int irq, int level)
 758 {
 759     typhoon_set_irq(opaque, 55, level);
 760 }
 761
 762 static void typhoon_set_timer_irq(void *opaque, int irq, int level)
 763 {
 764     TyphoonState *s = opaque;
 765     int i;
 766
 767     /* Thankfully, the mc146818rtc code doesn't track the IRQ state,
 768        and so we don't have to worry about missing interrupts just
 769        because we never actually ACK the interrupt.  Just ignore any
 770        case of the interrupt level going low.  */
 771     if (level == 0) {
 772         return;
 773     }
 774
 775     /* Deliver the interrupt to each CPU, considering each CPU's IIC.  */
 776     for (i = 0; i < 4; ++i) {
 777         AlphaCPU *cpu = s->cchip.cpu[i];
 778         if (cpu != NULL) {
 779             uint32_t iic = s->cchip.iic[i];
 780
 781             /* ??? The verbage in Section 10.2.2.10 isn't 100% clear.
 782                Bit 24 is the OverFlow bit, RO, and set when the count
 783                decrements past 0.  When is OF cleared?  My guess is that
 784                OF is actually cleared when the IIC is written, and that
 785                the ICNT field always decrements.  At least, that's an
 786                interpretation that makes sense, and "allows the CPU to
 787                determine exactly how mant interval timer ticks were
 788                skipped".  At least within the next 4M ticks...  */
 789
 790             iic = ((iic - 1) & 0x1ffffff) | (iic & 0x1000000);
 791             s->cchip.iic[i] = iic;
 792
 793             if (iic & 0x1000000) {
 794                 /* Set the ITI bit for this cpu.  */
 795                 s->cchip.misc |= 1 << (i + 4);
 796                 /* And signal the interrupt.  */
 797                 cpu_interrupt(CPU(cpu), CPU_INTERRUPT_TIMER);
 798             }
 799         }
 800     }
 801 }
 802
 803 static void typhoon_alarm_timer(void *opaque)
 804 {
 805     TyphoonState *s = (TyphoonState *)((uintptr_t)opaque & ~3);
 806     int cpu = (uintptr_t)opaque & 3;
 807
 808     /* Set the ITI bit for this cpu.  */
 809     s->cchip.misc |= 1 << (cpu + 4);
 810     cpu_interrupt(CPU(s->cchip.cpu[cpu]), CPU_INTERRUPT_TIMER);
 811 }
 812
 813 PCIBus *typhoon_init(ram_addr_t ram_size, ISABus **isa_bus,
 814                      qemu_irq *p_rtc_irq,
 815                      AlphaCPU *cpus[4], pci_map_irq_fn sys_map_irq)
 816 {
 817     const uint64_t MB = 1024 * 1024;
 818     const uint64_t GB = 1024 * MB;
 819     MemoryRegion *addr_space = get_system_memory();
 820     DeviceState *dev;
 821     TyphoonState *s;
 822     PCIHostState *phb;
 823     PCIBus *b;
 824     int i;
 825
 826     dev = qdev_create(NULL, TYPE_TYPHOON_PCI_HOST_BRIDGE);
 827
 828     s = TYPHOON_PCI_HOST_BRIDGE(dev);
 829     phb = PCI_HOST_BRIDGE(dev);
 830
 831     s->cchip.misc = 0x800000000ull; /* Revision: Typhoon.  */
 832     s->pchip.win[3].wba = 2;        /* Window 3 SG always enabled. */
 833
 834     /* Remember the CPUs so that we can deliver interrupts to them.  */
 835     for (i = 0; i < 4; i++) {
 836         AlphaCPU *cpu = cpus[i];
 837         s->cchip.cpu[i] = cpu;
 838         if (cpu != NULL) {
 839             cpu->alarm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
 840                                                  typhoon_alarm_timer,
 841                                                  (void *)((uintptr_t)s + i));
 842         }
 843     }
 844
 845     *p_rtc_irq = qemu_allocate_irq(typhoon_set_timer_irq, s, 0);
 846
 847     /* Main memory region, 0x00.0000.0000.  Real hardware supports 32GB,
 848        but the address space hole reserved at this point is 8TB.  */
 849     memory_region_allocate_system_memory(&s->ram_region, OBJECT(s), "ram",
 850                                          ram_size);
 851     memory_region_add_subregion(addr_space, 0, &s->ram_region);
 852
 853     /* TIGbus, 0x801.0000.0000, 1GB.  */
 854     /* ??? The TIGbus is used for delivering interrupts, and access to
 855        the flash ROM.  I'm not sure that we need to implement it at all.  */
 856
 857     /* Pchip0 CSRs, 0x801.8000.0000, 256MB.  */
 858     memory_region_init_io(&s->pchip.region, OBJECT(s), &pchip_ops, s, "pchip0",
 859                           256*MB);
 860     memory_region_add_subregion(addr_space, 0x80180000000ULL,
 861                                 &s->pchip.region);
 862
 863     /* Cchip CSRs, 0x801.A000.0000, 256MB.  */
 864     memory_region_init_io(&s->cchip.region, OBJECT(s), &cchip_ops, s, "cchip0",
 865                           256*MB);
 866     memory_region_add_subregion(addr_space, 0x801a0000000ULL,
 867                                 &s->cchip.region);
 868
 869     /* Dchip CSRs, 0x801.B000.0000, 256MB.  */
 870     memory_region_init_io(&s->dchip_region, OBJECT(s), &dchip_ops, s, "dchip0",
 871                           256*MB);
 872     memory_region_add_subregion(addr_space, 0x801b0000000ULL,
 873                                 &s->dchip_region);
 874
 875     /* Pchip0 PCI memory, 0x800.0000.0000, 4GB.  */
 876     memory_region_init(&s->pchip.reg_mem, OBJECT(s), "pci0-mem", 4*GB);
 877     memory_region_add_subregion(addr_space, 0x80000000000ULL,
 878                                 &s->pchip.reg_mem);
 879
 880     /* Pchip0 PCI I/O, 0x801.FC00.0000, 32MB.  */
 881     memory_region_init_io(&s->pchip.reg_io, OBJECT(s), &alpha_pci_ignore_ops,
 882                           NULL, "pci0-io", 32*MB);
 883     memory_region_add_subregion(addr_space, 0x801fc000000ULL,
 884                                 &s->pchip.reg_io);
 885
 886     b = pci_register_bus(dev, "pci",
 887                          typhoon_set_irq, sys_map_irq, s,
 888                          &s->pchip.reg_mem, &s->pchip.reg_io,
 889                          0, 64, TYPE_PCI_BUS);
 890     phb->bus = b;
 891     qdev_init_nofail(dev);
 892
 893     /* Host memory as seen from the PCI side, via the IOMMU.  */
 894     memory_region_init_iommu(&s->pchip.iommu, OBJECT(s), &typhoon_iommu_ops,
 895                              "iommu-typhoon", UINT64_MAX);
 896     address_space_init(&s->pchip.iommu_as, &s->pchip.iommu, "pchip0-pci");
 897     pci_setup_iommu(b, typhoon_pci_dma_iommu, s);
 898
 899     /* Pchip0 PCI special/interrupt acknowledge, 0x801.F800.0000, 64MB.  */
 900     memory_region_init_io(&s->pchip.reg_iack, OBJECT(s), &alpha_pci_iack_ops,
 901                           b, "pci0-iack", 64*MB);
 902     memory_region_add_subregion(addr_space, 0x801f8000000ULL,
 903                                 &s->pchip.reg_iack);
 904
 905     /* Pchip0 PCI configuration, 0x801.FE00.0000, 16MB.  */
 906     memory_region_init_io(&s->pchip.reg_conf, OBJECT(s), &alpha_pci_conf1_ops,
 907                           b, "pci0-conf", 16*MB);
 908     memory_region_add_subregion(addr_space, 0x801fe000000ULL,
 909                                 &s->pchip.reg_conf);
 910
 911     /* For the record, these are the mappings for the second PCI bus.
 912        We can get away with not implementing them because we indicate
 913        via the Cchip.CSC<PIP> bit that Pchip1 is not present.  */
 914     /* Pchip1 PCI memory, 0x802.0000.0000, 4GB.  */
 915     /* Pchip1 CSRs, 0x802.8000.0000, 256MB.  */
 916     /* Pchip1 PCI special/interrupt acknowledge, 0x802.F800.0000, 64MB.  */
 917     /* Pchip1 PCI I/O, 0x802.FC00.0000, 32MB.  */
 918     /* Pchip1 PCI configuration, 0x802.FE00.0000, 16MB.  */
 919
 920     /* Init the ISA bus.  */
 921     /* ??? Technically there should be a cy82c693ub pci-isa bridge.  */
 922     {
 923         qemu_irq *isa_irqs;
 924
 925         *isa_bus = isa_bus_new(NULL, get_system_memory(), &s->pchip.reg_io,
 926                                &error_abort);
 927         isa_irqs = i8259_init(*isa_bus,
 928                               qemu_allocate_irq(typhoon_set_isa_irq, s, 0));
 929         isa_bus_irqs(*isa_bus, isa_irqs);
 930     }
 931
 932     return b;
 933 }
 934
 935 static int typhoon_pcihost_init(SysBusDevice *dev)
 936 {
 937     return 0;
 938 }
 939
 940 static void typhoon_pcihost_class_init(ObjectClass *klass, void *data)
 941 {
 942     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 943
 944     k->init = typhoon_pcihost_init;
 945 }
 946
 947 static const TypeInfo typhoon_pcihost_info = {
 948     .name          = TYPE_TYPHOON_PCI_HOST_BRIDGE,
 949     .parent        = TYPE_PCI_HOST_BRIDGE,
 950     .instance_size = sizeof(TyphoonState),
 951     .class_init    = typhoon_pcihost_class_init,
 952 };
 953
 954 static void typhoon_register_types(void)
 955 {
 956     type_register_static(&typhoon_pcihost_info);
 957 }
 958
 959 type_init(typhoon_register_types)