LXR qemu/hw/sparc/sun4m

   1/*
   2 * QEMU Sun4m iommu emulation
   3 *
   4 * Copyright (c) 2003-2005 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#include "qemu/osdep.h"
  26#include "hw/irq.h"
  27#include "hw/qdev-properties.h"
  28#include "hw/sparc/sun4m_iommu.h"
  29#include "hw/sysbus.h"
  30#include "migration/vmstate.h"
  31#include "qemu/module.h"
  32#include "exec/address-spaces.h"
  33#include "trace.h"
  34
  35/*
  36 * I/O MMU used by Sun4m systems
  37 *
  38 * Chipset docs:
  39 * "Sun-4M System Architecture (revision 2.0) by Chuck Narad", 950-1373-01,
  40 * http://mediacast.sun.com/users/Barton808/media/Sun4M_SystemArchitecture_edited2.pdf
  41 */
  42
  43#define IOMMU_CTRL          (0x0000 >> 2)
  44#define IOMMU_CTRL_IMPL     0xf0000000 /* Implementation */
  45#define IOMMU_CTRL_VERS     0x0f000000 /* Version */
  46#define IOMMU_CTRL_RNGE     0x0000001c /* Mapping RANGE */
  47#define IOMMU_RNGE_16MB     0x00000000 /* 0xff000000 -> 0xffffffff */
  48#define IOMMU_RNGE_32MB     0x00000004 /* 0xfe000000 -> 0xffffffff */
  49#define IOMMU_RNGE_64MB     0x00000008 /* 0xfc000000 -> 0xffffffff */
  50#define IOMMU_RNGE_128MB    0x0000000c /* 0xf8000000 -> 0xffffffff */
  51#define IOMMU_RNGE_256MB    0x00000010 /* 0xf0000000 -> 0xffffffff */
  52#define IOMMU_RNGE_512MB    0x00000014 /* 0xe0000000 -> 0xffffffff */
  53#define IOMMU_RNGE_1GB      0x00000018 /* 0xc0000000 -> 0xffffffff */
  54#define IOMMU_RNGE_2GB      0x0000001c /* 0x80000000 -> 0xffffffff */
  55#define IOMMU_CTRL_ENAB     0x00000001 /* IOMMU Enable */
  56#define IOMMU_CTRL_MASK     0x0000001d
  57
  58#define IOMMU_BASE          (0x0004 >> 2)
  59#define IOMMU_BASE_MASK     0x07fffc00
  60
  61#define IOMMU_TLBFLUSH      (0x0014 >> 2)
  62#define IOMMU_TLBFLUSH_MASK 0xffffffff
  63
  64#define IOMMU_PGFLUSH       (0x0018 >> 2)
  65#define IOMMU_PGFLUSH_MASK  0xffffffff
  66
  67#define IOMMU_AFSR          (0x1000 >> 2)
  68#define IOMMU_AFSR_ERR      0x80000000 /* LE, TO, or BE asserted */
  69#define IOMMU_AFSR_LE       0x40000000 /* SBUS reports error after
  70                                          transaction */
  71#define IOMMU_AFSR_TO       0x20000000 /* Write access took more than
  72                                          12.8 us. */
  73#define IOMMU_AFSR_BE       0x10000000 /* Write access received error
  74                                          acknowledge */
  75#define IOMMU_AFSR_SIZE     0x0e000000 /* Size of transaction causing error */
  76#define IOMMU_AFSR_S        0x01000000 /* Sparc was in supervisor mode */
  77#define IOMMU_AFSR_RESV     0x00800000 /* Reserved, forced to 0x8 by
  78                                          hardware */
  79#define IOMMU_AFSR_ME       0x00080000 /* Multiple errors occurred */
  80#define IOMMU_AFSR_RD       0x00040000 /* A read operation was in progress */
  81#define IOMMU_AFSR_FAV      0x00020000 /* IOMMU afar has valid contents */
  82#define IOMMU_AFSR_MASK     0xff0fffff
  83
  84#define IOMMU_AFAR          (0x1004 >> 2)
  85
  86#define IOMMU_AER           (0x1008 >> 2) /* Arbiter Enable Register */
  87#define IOMMU_AER_EN_P0_ARB 0x00000001    /* MBus master 0x8 (Always 1) */
  88#define IOMMU_AER_EN_P1_ARB 0x00000002    /* MBus master 0x9 */
  89#define IOMMU_AER_EN_P2_ARB 0x00000004    /* MBus master 0xa */
  90#define IOMMU_AER_EN_P3_ARB 0x00000008    /* MBus master 0xb */
  91#define IOMMU_AER_EN_0      0x00010000    /* SBus slot 0 */
  92#define IOMMU_AER_EN_1      0x00020000    /* SBus slot 1 */
  93#define IOMMU_AER_EN_2      0x00040000    /* SBus slot 2 */
  94#define IOMMU_AER_EN_3      0x00080000    /* SBus slot 3 */
  95#define IOMMU_AER_EN_F      0x00100000    /* SBus on-board */
  96#define IOMMU_AER_SBW       0x80000000    /* S-to-M asynchronous writes */
  97#define IOMMU_AER_MASK      0x801f000f
  98
  99#define IOMMU_SBCFG0        (0x1010 >> 2) /* SBUS configration per-slot */
 100#define IOMMU_SBCFG1        (0x1014 >> 2) /* SBUS configration per-slot */
 101#define IOMMU_SBCFG2        (0x1018 >> 2) /* SBUS configration per-slot */
 102#define IOMMU_SBCFG3        (0x101c >> 2) /* SBUS configration per-slot */
 103#define IOMMU_SBCFG_SAB30   0x00010000 /* Phys-address bit 30 when
 104                                          bypass enabled */
 105#define IOMMU_SBCFG_BA16    0x00000004 /* Slave supports 16 byte bursts */
 106#define IOMMU_SBCFG_BA8     0x00000002 /* Slave supports 8 byte bursts */
 107#define IOMMU_SBCFG_BYPASS  0x00000001 /* Bypass IOMMU, treat all addresses
 108                                          produced by this device as pure
 109                                          physical. */
 110#define IOMMU_SBCFG_MASK    0x00010003
 111
 112#define IOMMU_ARBEN         (0x2000 >> 2) /* SBUS arbitration enable */
 113#define IOMMU_ARBEN_MASK    0x001f0000
 114#define IOMMU_MID           0x00000008
 115
 116#define IOMMU_MASK_ID       (0x3018 >> 2) /* Mask ID */
 117#define IOMMU_MASK_ID_MASK  0x00ffffff
 118
 119#define IOMMU_MSII_MASK     0x26000000 /* microSPARC II mask number */
 120#define IOMMU_TS_MASK       0x23000000 /* turboSPARC mask number */
 121
 122/* The format of an iopte in the page tables */
 123#define IOPTE_PAGE          0xffffff00 /* Physical page number (PA[35:12]) */
 124#define IOPTE_CACHE         0x00000080 /* Cached (in vme IOCACHE or
 125                                          Viking/MXCC) */
 126#define IOPTE_WRITE         0x00000004 /* Writable */
 127#define IOPTE_VALID         0x00000002 /* IOPTE is valid */
 128#define IOPTE_WAZ           0x00000001 /* Write as zeros */
 129
 130#define IOMMU_PAGE_SHIFT    12
 131#define IOMMU_PAGE_SIZE     (1 << IOMMU_PAGE_SHIFT)
 132#define IOMMU_PAGE_MASK     (~(IOMMU_PAGE_SIZE - 1))
 133
 134static uint64_t iommu_mem_read(void *opaque, hwaddr addr,
 135                               unsigned size)
 136{
 137    IOMMUState *s = opaque;
 138    hwaddr saddr;
 139    uint32_t ret;
 140
 141    saddr = addr >> 2;
 142    switch (saddr) {
 143    default:
 144        ret = s->regs[saddr];
 145        break;
 146    case IOMMU_AFAR:
 147    case IOMMU_AFSR:
 148        ret = s->regs[saddr];
 149        qemu_irq_lower(s->irq);
 150        break;
 151    }
 152    trace_sun4m_iommu_mem_readl(saddr, ret);
 153    return ret;
 154}
 155
 156static void iommu_mem_write(void *opaque, hwaddr addr,
 157                            uint64_t val, unsigned size)
 158{
 159    IOMMUState *s = opaque;
 160    hwaddr saddr;
 161
 162    saddr = addr >> 2;
 163    trace_sun4m_iommu_mem_writel(saddr, val);
 164    switch (saddr) {
 165    case IOMMU_CTRL:
 166        switch (val & IOMMU_CTRL_RNGE) {
 167        case IOMMU_RNGE_16MB:
 168            s->iostart = 0xffffffffff000000ULL;
 169            break;
 170        case IOMMU_RNGE_32MB:
 171            s->iostart = 0xfffffffffe000000ULL;
 172            break;
 173        case IOMMU_RNGE_64MB:
 174            s->iostart = 0xfffffffffc000000ULL;
 175            break;
 176        case IOMMU_RNGE_128MB:
 177            s->iostart = 0xfffffffff8000000ULL;
 178            break;
 179        case IOMMU_RNGE_256MB:
 180            s->iostart = 0xfffffffff0000000ULL;
 181            break;
 182        case IOMMU_RNGE_512MB:
 183            s->iostart = 0xffffffffe0000000ULL;
 184            break;
 185        case IOMMU_RNGE_1GB:
 186            s->iostart = 0xffffffffc0000000ULL;
 187            break;
 188        default:
 189        case IOMMU_RNGE_2GB:
 190            s->iostart = 0xffffffff80000000ULL;
 191            break;
 192        }
 193        trace_sun4m_iommu_mem_writel_ctrl(s->iostart);
 194        s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);
 195        break;
 196    case IOMMU_BASE:
 197        s->regs[saddr] = val & IOMMU_BASE_MASK;
 198        break;
 199    case IOMMU_TLBFLUSH:
 200        trace_sun4m_iommu_mem_writel_tlbflush(val);
 201        s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
 202        break;
 203    case IOMMU_PGFLUSH:
 204        trace_sun4m_iommu_mem_writel_pgflush(val);
 205        s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
 206        break;
 207    case IOMMU_AFAR:
 208        s->regs[saddr] = val;
 209        qemu_irq_lower(s->irq);
 210        break;
 211    case IOMMU_AER:
 212        s->regs[saddr] = (val & IOMMU_AER_MASK) | IOMMU_AER_EN_P0_ARB;
 213        break;
 214    case IOMMU_AFSR:
 215        s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV;
 216        qemu_irq_lower(s->irq);
 217        break;
 218    case IOMMU_SBCFG0:
 219    case IOMMU_SBCFG1:
 220    case IOMMU_SBCFG2:
 221    case IOMMU_SBCFG3:
 222        s->regs[saddr] = val & IOMMU_SBCFG_MASK;
 223        break;
 224    case IOMMU_ARBEN:
 225        /* XXX implement SBus probing: fault when reading unmapped
 226           addresses, fault cause and address stored to MMU/IOMMU */
 227        s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;
 228        break;
 229    case IOMMU_MASK_ID:
 230        s->regs[saddr] |= val & IOMMU_MASK_ID_MASK;
 231        break;
 232    default:
 233        s->regs[saddr] = val;
 234        break;
 235    }
 236}
 237
 238static const MemoryRegionOps iommu_mem_ops = {
 239    .read = iommu_mem_read,
 240    .write = iommu_mem_write,
 241    .endianness = DEVICE_NATIVE_ENDIAN,
 242    .valid = {
 243        .min_access_size = 4,
 244        .max_access_size = 4,
 245    },
 246};
 247
 248static uint32_t iommu_page_get_flags(IOMMUState *s, hwaddr addr)
 249{
 250    uint32_t ret;
 251    hwaddr iopte;
 252    hwaddr pa = addr;
 253
 254    iopte = s->regs[IOMMU_BASE] << 4;
 255    addr &= ~s->iostart;
 256    iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3;
 257    ret = address_space_ldl_be(&address_space_memory, iopte,
 258                               MEMTXATTRS_UNSPECIFIED, NULL);
 259    trace_sun4m_iommu_page_get_flags(pa, iopte, ret);
 260    return ret;
 261}
 262
 263static hwaddr iommu_translate_pa(hwaddr addr,
 264                                             uint32_t pte)
 265{
 266    hwaddr pa;
 267
 268    pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK);
 269    trace_sun4m_iommu_translate_pa(addr, pa, pte);
 270    return pa;
 271}
 272
 273static void iommu_bad_addr(IOMMUState *s, hwaddr addr,
 274                           int is_write)
 275{
 276    trace_sun4m_iommu_bad_addr(addr);
 277    s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV |
 278        IOMMU_AFSR_FAV;
 279    if (!is_write) {
 280        s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD;
 281    }
 282    s->regs[IOMMU_AFAR] = addr;
 283    qemu_irq_raise(s->irq);
 284}
 285
 286/* Called from RCU critical section */
 287static IOMMUTLBEntry sun4m_translate_iommu(IOMMUMemoryRegion *iommu,
 288                                           hwaddr addr,
 289                                           IOMMUAccessFlags flags,
 290                                           int iommu_idx)
 291{
 292    IOMMUState *is = container_of(iommu, IOMMUState, iommu);
 293    hwaddr page, pa;
 294    int is_write = (flags & IOMMU_WO) ? 1 : 0;
 295    uint32_t pte;
 296    IOMMUTLBEntry ret = {
 297        .target_as = &address_space_memory,
 298        .iova = 0,
 299        .translated_addr = 0,
 300        .addr_mask = ~(hwaddr)0,
 301        .perm = IOMMU_NONE,
 302    };
 303
 304    page = addr & IOMMU_PAGE_MASK;
 305    pte = iommu_page_get_flags(is, page);
 306    if (!(pte & IOPTE_VALID)) {
 307        iommu_bad_addr(is, page, is_write);
 308        return ret;
 309    }
 310
 311    pa = iommu_translate_pa(addr, pte);
 312    if (is_write && !(pte & IOPTE_WRITE)) {
 313        iommu_bad_addr(is, page, is_write);
 314        return ret;
 315    }
 316
 317    if (pte & IOPTE_WRITE) {
 318        ret.perm = IOMMU_RW;
 319    } else {
 320        ret.perm = IOMMU_RO;
 321    }
 322
 323    ret.iova = page;
 324    ret.translated_addr = pa;
 325    ret.addr_mask = ~IOMMU_PAGE_MASK;
 326
 327    return ret;
 328}
 329
 330static const VMStateDescription vmstate_iommu = {
 331    .name = "iommu",
 332    .version_id = 2,
 333    .minimum_version_id = 2,
 334    .fields = (VMStateField[]) {
 335        VMSTATE_UINT32_ARRAY(regs, IOMMUState, IOMMU_NREGS),
 336        VMSTATE_UINT64(iostart, IOMMUState),
 337        VMSTATE_END_OF_LIST()
 338    }
 339};
 340
 341static void iommu_reset(DeviceState *d)
 342{
 343    IOMMUState *s = SUN4M_IOMMU(d);
 344
 345    memset(s->regs, 0, IOMMU_NREGS * 4);
 346    s->iostart = 0;
 347    s->regs[IOMMU_CTRL] = s->version;
 348    s->regs[IOMMU_ARBEN] = IOMMU_MID;
 349    s->regs[IOMMU_AFSR] = IOMMU_AFSR_RESV;
 350    s->regs[IOMMU_AER] = IOMMU_AER_EN_P0_ARB | IOMMU_AER_EN_P1_ARB;
 351    s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK;
 352}
 353
 354static void iommu_init(Object *obj)
 355{
 356    IOMMUState *s = SUN4M_IOMMU(obj);
 357    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 358
 359    memory_region_init_iommu(&s->iommu, sizeof(s->iommu),
 360                             TYPE_SUN4M_IOMMU_MEMORY_REGION, OBJECT(dev),
 361                             "iommu-sun4m", UINT64_MAX);
 362    address_space_init(&s->iommu_as, MEMORY_REGION(&s->iommu), "iommu-as");
 363
 364    sysbus_init_irq(dev, &s->irq);
 365
 366    memory_region_init_io(&s->iomem, obj, &iommu_mem_ops, s, "iommu",
 367                          IOMMU_NREGS * sizeof(uint32_t));
 368    sysbus_init_mmio(dev, &s->iomem);
 369}
 370
 371static Property iommu_properties[] = {
 372    DEFINE_PROP_UINT32("version", IOMMUState, version, 0),
 373    DEFINE_PROP_END_OF_LIST(),
 374};
 375
 376static void iommu_class_init(ObjectClass *klass, void *data)
 377{
 378    DeviceClass *dc = DEVICE_CLASS(klass);
 379
 380    dc->reset = iommu_reset;
 381    dc->vmsd = &vmstate_iommu;
 382    dc->props = iommu_properties;
 383}
 384
 385static const TypeInfo iommu_info = {
 386    .name          = TYPE_SUN4M_IOMMU,
 387    .parent        = TYPE_SYS_BUS_DEVICE,
 388    .instance_size = sizeof(IOMMUState),
 389    .instance_init = iommu_init,
 390    .class_init    = iommu_class_init,
 391};
 392
 393static void sun4m_iommu_memory_region_class_init(ObjectClass *klass, void *data)
 394{
 395    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass);
 396
 397    imrc->translate = sun4m_translate_iommu;
 398}
 399
 400static const TypeInfo sun4m_iommu_memory_region_info = {
 401    .parent = TYPE_IOMMU_MEMORY_REGION,
 402    .name = TYPE_SUN4M_IOMMU_MEMORY_REGION,
 403    .class_init = sun4m_iommu_memory_region_class_init,
 404};
 405
 406static void iommu_register_types(void)
 407{
 408    type_register_static(&iommu_info);
 409    type_register_static(&sun4m_iommu_memory_region_info);
 410}
 411
 412type_init(iommu_register_types)
 413