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