hw/iommu.c

   1 /*
   2  * QEMU SPARC 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 #include "hw.h"
  25 #include "sun4m.h"
  26
  27 /* debug iommu */
  28 //#define DEBUG_IOMMU
  29
  30 #ifdef DEBUG_IOMMU
  31 #define DPRINTF(fmt, args...) \
  32 do { printf("IOMMU: " fmt , ##args); } while (0)
  33 #else
  34 #define DPRINTF(fmt, args...)
  35 #endif
  36
  37 #define IOMMU_NREGS         (4*4096/4)
  38 #define IOMMU_CTRL          (0x0000 >> 2)
  39 #define IOMMU_CTRL_IMPL     0xf0000000 /* Implementation */
  40 #define IOMMU_CTRL_VERS     0x0f000000 /* Version */
  41 #define IOMMU_CTRL_RNGE     0x0000001c /* Mapping RANGE */
  42 #define IOMMU_RNGE_16MB     0x00000000 /* 0xff000000 -> 0xffffffff */
  43 #define IOMMU_RNGE_32MB     0x00000004 /* 0xfe000000 -> 0xffffffff */
  44 #define IOMMU_RNGE_64MB     0x00000008 /* 0xfc000000 -> 0xffffffff */
  45 #define IOMMU_RNGE_128MB    0x0000000c /* 0xf8000000 -> 0xffffffff */
  46 #define IOMMU_RNGE_256MB    0x00000010 /* 0xf0000000 -> 0xffffffff */
  47 #define IOMMU_RNGE_512MB    0x00000014 /* 0xe0000000 -> 0xffffffff */
  48 #define IOMMU_RNGE_1GB      0x00000018 /* 0xc0000000 -> 0xffffffff */
  49 #define IOMMU_RNGE_2GB      0x0000001c /* 0x80000000 -> 0xffffffff */
  50 #define IOMMU_CTRL_ENAB     0x00000001 /* IOMMU Enable */
  51 #define IOMMU_CTRL_MASK     0x0000001d
  52
  53 #define IOMMU_BASE          (0x0004 >> 2)
  54 #define IOMMU_BASE_MASK     0x07fffc00
  55
  56 #define IOMMU_TLBFLUSH      (0x0014 >> 2)
  57 #define IOMMU_TLBFLUSH_MASK 0xffffffff
  58
  59 #define IOMMU_PGFLUSH       (0x0018 >> 2)
  60 #define IOMMU_PGFLUSH_MASK  0xffffffff
  61
  62 #define IOMMU_AFSR          (0x1000 >> 2)
  63 #define IOMMU_AFSR_ERR      0x80000000 /* LE, TO, or BE asserted */
  64 #define IOMMU_AFSR_LE       0x40000000 /* SBUS reports error after
  65                                           transaction */
  66 #define IOMMU_AFSR_TO       0x20000000 /* Write access took more than
  67                                           12.8 us. */
  68 #define IOMMU_AFSR_BE       0x10000000 /* Write access received error
  69                                           acknowledge */
  70 #define IOMMU_AFSR_SIZE     0x0e000000 /* Size of transaction causing error */
  71 #define IOMMU_AFSR_S        0x01000000 /* Sparc was in supervisor mode */
  72 #define IOMMU_AFSR_RESV     0x00800000 /* Reserved, forced to 0x8 by
  73                                           hardware */
  74 #define IOMMU_AFSR_ME       0x00080000 /* Multiple errors occurred */
  75 #define IOMMU_AFSR_RD       0x00040000 /* A read operation was in progress */
  76 #define IOMMU_AFSR_FAV      0x00020000 /* IOMMU afar has valid contents */
  77 #define IOMMU_AFSR_MASK     0xff0fffff
  78
  79 #define IOMMU_AFAR          (0x1004 >> 2)
  80
  81 #define IOMMU_AER           (0x1008 >> 2) /* Arbiter Enable Register */
  82 #define IOMMU_AER_EN_P0_ARB 0x00000001    /* MBus master 0x8 (Always 1) */
  83 #define IOMMU_AER_EN_P1_ARB 0x00000002    /* MBus master 0x9 */
  84 #define IOMMU_AER_EN_P2_ARB 0x00000004    /* MBus master 0xa */
  85 #define IOMMU_AER_EN_P3_ARB 0x00000008    /* MBus master 0xb */
  86 #define IOMMU_AER_EN_0      0x00010000    /* SBus slot 0 */
  87 #define IOMMU_AER_EN_1      0x00020000    /* SBus slot 1 */
  88 #define IOMMU_AER_EN_2      0x00040000    /* SBus slot 2 */
  89 #define IOMMU_AER_EN_3      0x00080000    /* SBus slot 3 */
  90 #define IOMMU_AER_EN_F      0x00100000    /* SBus on-board */
  91 #define IOMMU_AER_SBW       0x80000000    /* S-to-M asynchronous writes */
  92 #define IOMMU_AER_MASK      0x801f000f
  93
  94 #define IOMMU_SBCFG0        (0x1010 >> 2) /* SBUS configration per-slot */
  95 #define IOMMU_SBCFG1        (0x1014 >> 2) /* SBUS configration per-slot */
  96 #define IOMMU_SBCFG2        (0x1018 >> 2) /* SBUS configration per-slot */
  97 #define IOMMU_SBCFG3        (0x101c >> 2) /* SBUS configration per-slot */
  98 #define IOMMU_SBCFG_SAB30   0x00010000 /* Phys-address bit 30 when
  99                                           bypass enabled */
 100 #define IOMMU_SBCFG_BA16    0x00000004 /* Slave supports 16 byte bursts */
 101 #define IOMMU_SBCFG_BA8     0x00000002 /* Slave supports 8 byte bursts */
 102 #define IOMMU_SBCFG_BYPASS  0x00000001 /* Bypass IOMMU, treat all addresses
 103                                           produced by this device as pure
 104                                           physical. */
 105 #define IOMMU_SBCFG_MASK    0x00010003
 106
 107 #define IOMMU_ARBEN         (0x2000 >> 2) /* SBUS arbitration enable */
 108 #define IOMMU_ARBEN_MASK    0x001f0000
 109 #define IOMMU_MID           0x00000008
 110
 111 #define IOMMU_MASK_ID       (0x3018 >> 2) /* Mask ID */
 112 #define IOMMU_MASK_ID_MASK  0x00ffffff
 113
 114 #define IOMMU_MSII_MASK     0x26000000 /* microSPARC II mask number */
 115 #define IOMMU_TS_MASK       0x23000000 /* turboSPARC mask number */
 116
 117 /* The format of an iopte in the page tables */
 118 #define IOPTE_PAGE          0xffffff00 /* Physical page number (PA[35:12]) */
 119 #define IOPTE_CACHE         0x00000080 /* Cached (in vme IOCACHE or
 120                                           Viking/MXCC) */
 121 #define IOPTE_WRITE         0x00000004 /* Writeable */
 122 #define IOPTE_VALID         0x00000002 /* IOPTE is valid */
 123 #define IOPTE_WAZ           0x00000001 /* Write as zeros */
 124
 125 #define IOMMU_PAGE_SHIFT    12
 126 #define IOMMU_PAGE_SIZE     (1 << IOMMU_PAGE_SHIFT)
 127 #define IOMMU_PAGE_MASK     ~(IOMMU_PAGE_SIZE - 1)
 128
 129 typedef struct IOMMUState {
 130     uint32_t regs[IOMMU_NREGS];
 131     target_phys_addr_t iostart;
 132     uint32_t version;
 133     qemu_irq irq;
 134 } IOMMUState;
 135
 136 static uint32_t iommu_mem_readl(void *opaque, target_phys_addr_t addr)
 137 {
 138     IOMMUState *s = opaque;
 139     target_phys_addr_t saddr;
 140     uint32_t ret;
 141
 142     saddr = addr >> 2;
 143     switch (saddr) {
 144     default:
 145         ret = s->regs[saddr];
 146         break;
 147     case IOMMU_AFAR:
 148     case IOMMU_AFSR:
 149         ret = s->regs[saddr];
 150         qemu_irq_lower(s->irq);
 151         break;
 152     }
 153     DPRINTF("read reg[%d] = %x\n", (int)saddr, ret);
 154     return ret;
 155 }
 156
 157 static void iommu_mem_writel(void *opaque, target_phys_addr_t addr,
 158                              uint32_t val)
 159 {
 160     IOMMUState *s = opaque;
 161     target_phys_addr_t saddr;
 162
 163     saddr = addr >> 2;
 164     DPRINTF("write reg[%d] = %x\n", (int)saddr, val);
 165     switch (saddr) {
 166     case IOMMU_CTRL:
 167         switch (val & IOMMU_CTRL_RNGE) {
 168         case IOMMU_RNGE_16MB:
 169             s->iostart = 0xffffffffff000000ULL;
 170             break;
 171         case IOMMU_RNGE_32MB:
 172             s->iostart = 0xfffffffffe000000ULL;
 173             break;
 174         case IOMMU_RNGE_64MB:
 175             s->iostart = 0xfffffffffc000000ULL;
 176             break;
 177         case IOMMU_RNGE_128MB:
 178             s->iostart = 0xfffffffff8000000ULL;
 179             break;
 180         case IOMMU_RNGE_256MB:
 181             s->iostart = 0xfffffffff0000000ULL;
 182             break;
 183         case IOMMU_RNGE_512MB:
 184             s->iostart = 0xffffffffe0000000ULL;
 185             break;
 186         case IOMMU_RNGE_1GB:
 187             s->iostart = 0xffffffffc0000000ULL;
 188             break;
 189         default:
 190         case IOMMU_RNGE_2GB:
 191             s->iostart = 0xffffffff80000000ULL;
 192             break;
 193         }
 194         DPRINTF("iostart = " TARGET_FMT_plx "\n", s->iostart);
 195         s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);
 196         break;
 197     case IOMMU_BASE:
 198         s->regs[saddr] = val & IOMMU_BASE_MASK;
 199         break;
 200     case IOMMU_TLBFLUSH:
 201         DPRINTF("tlb flush %x\n", val);
 202         s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
 203         break;
 204     case IOMMU_PGFLUSH:
 205         DPRINTF("page flush %x\n", val);
 206         s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
 207         break;
 208     case IOMMU_AFAR:
 209         s->regs[saddr] = val;
 210         qemu_irq_lower(s->irq);
 211         break;
 212     case IOMMU_AER:
 213         s->regs[saddr] = (val & IOMMU_AER_MASK) | IOMMU_AER_EN_P0_ARB;
 214         break;
 215     case IOMMU_AFSR:
 216         s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV;
 217         qemu_irq_lower(s->irq);
 218         break;
 219     case IOMMU_SBCFG0:
 220     case IOMMU_SBCFG1:
 221     case IOMMU_SBCFG2:
 222     case IOMMU_SBCFG3:
 223         s->regs[saddr] = val & IOMMU_SBCFG_MASK;
 224         break;
 225     case IOMMU_ARBEN:
 226         // XXX implement SBus probing: fault when reading unmapped
 227         // addresses, fault cause and address stored to MMU/IOMMU
 228         s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;
 229         break;
 230     case IOMMU_MASK_ID:
 231         s->regs[saddr] |= val & IOMMU_MASK_ID_MASK;
 232         break;
 233     default:
 234         s->regs[saddr] = val;
 235         break;
 236     }
 237 }
 238
 239 static CPUReadMemoryFunc *iommu_mem_read[3] = {
 240     NULL,
 241     NULL,
 242     iommu_mem_readl,
 243 };
 244
 245 static CPUWriteMemoryFunc *iommu_mem_write[3] = {
 246     NULL,
 247     NULL,
 248     iommu_mem_writel,
 249 };
 250
 251 static uint32_t iommu_page_get_flags(IOMMUState *s, target_phys_addr_t addr)
 252 {
 253     uint32_t ret;
 254     target_phys_addr_t iopte;
 255 #ifdef DEBUG_IOMMU
 256     target_phys_addr_t pa = addr;
 257 #endif
 258
 259     iopte = s->regs[IOMMU_BASE] << 4;
 260     addr &= ~s->iostart;
 261     iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3;
 262     cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);
 263     tswap32s(&ret);
 264     DPRINTF("get flags addr " TARGET_FMT_plx " => pte " TARGET_FMT_plx
 265             ", *pte = %x\n", pa, iopte, ret);
 266
 267     return ret;
 268 }
 269
 270 static target_phys_addr_t iommu_translate_pa(target_phys_addr_t addr,
 271                                              uint32_t pte)
 272 {
 273     uint32_t tmppte;
 274     target_phys_addr_t pa;
 275
 276     tmppte = pte;
 277     pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK);
 278     DPRINTF("xlate dva " TARGET_FMT_plx " => pa " TARGET_FMT_plx
 279             " (iopte = %x)\n", addr, pa, tmppte);
 280
 281     return pa;
 282 }
 283
 284 static void iommu_bad_addr(IOMMUState *s, target_phys_addr_t addr,
 285                            int is_write)
 286 {
 287     DPRINTF("bad addr " TARGET_FMT_plx "\n", addr);
 288     s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV |
 289         IOMMU_AFSR_FAV;
 290     if (!is_write)
 291         s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD;
 292     s->regs[IOMMU_AFAR] = addr;
 293     qemu_irq_raise(s->irq);
 294 }
 295
 296 void sparc_iommu_memory_rw(void *opaque, target_phys_addr_t addr,
 297                            uint8_t *buf, int len, int is_write)
 298 {
 299     int l;
 300     uint32_t flags;
 301     target_phys_addr_t page, phys_addr;
 302
 303     while (len > 0) {
 304         page = addr & IOMMU_PAGE_MASK;
 305         l = (page + IOMMU_PAGE_SIZE) - addr;
 306         if (l > len)
 307             l = len;
 308         flags = iommu_page_get_flags(opaque, page);
 309         if (!(flags & IOPTE_VALID)) {
 310             iommu_bad_addr(opaque, page, is_write);
 311             return;
 312         }
 313         phys_addr = iommu_translate_pa(addr, flags);
 314         if (is_write) {
 315             if (!(flags & IOPTE_WRITE)) {
 316                 iommu_bad_addr(opaque, page, is_write);
 317                 return;
 318             }
 319             cpu_physical_memory_write(phys_addr, buf, l);
 320         } else {
 321             cpu_physical_memory_read(phys_addr, buf, l);
 322         }
 323         len -= l;
 324         buf += l;
 325         addr += l;
 326     }
 327 }
 328
 329 static void iommu_save(QEMUFile *f, void *opaque)
 330 {
 331     IOMMUState *s = opaque;
 332     int i;
 333
 334     for (i = 0; i < IOMMU_NREGS; i++)
 335         qemu_put_be32s(f, &s->regs[i]);
 336     qemu_put_be64s(f, &s->iostart);
 337 }
 338
 339 static int iommu_load(QEMUFile *f, void *opaque, int version_id)
 340 {
 341     IOMMUState *s = opaque;
 342     int i;
 343
 344     if (version_id != 2)
 345         return -EINVAL;
 346
 347     for (i = 0; i < IOMMU_NREGS; i++)
 348         qemu_get_be32s(f, &s->regs[i]);
 349     qemu_get_be64s(f, &s->iostart);
 350
 351     return 0;
 352 }
 353
 354 static void iommu_reset(void *opaque)
 355 {
 356     IOMMUState *s = opaque;
 357
 358     memset(s->regs, 0, IOMMU_NREGS * 4);
 359     s->iostart = 0;
 360     s->regs[IOMMU_CTRL] = s->version;
 361     s->regs[IOMMU_ARBEN] = IOMMU_MID;
 362     s->regs[IOMMU_AFSR] = IOMMU_AFSR_RESV;
 363     s->regs[IOMMU_AER] = IOMMU_AER_EN_P0_ARB | IOMMU_AER_EN_P1_ARB;
 364     s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK;
 365     qemu_irq_lower(s->irq);
 366 }
 367
 368 void *iommu_init(target_phys_addr_t addr, uint32_t version, qemu_irq irq)
 369 {
 370     IOMMUState *s;
 371     int iommu_io_memory;
 372
 373     s = qemu_mallocz(sizeof(IOMMUState));
 374     if (!s)
 375         return NULL;
 376
 377     s->version = version;
 378     s->irq = irq;
 379
 380     iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read,
 381                                              iommu_mem_write, s);
 382     cpu_register_physical_memory(addr, IOMMU_NREGS * 4, iommu_io_memory);
 383
 384     register_savevm("iommu", addr, 2, iommu_save, iommu_load, s);
 385     qemu_register_reset(iommu_reset, s);
 386     iommu_reset(s);
 387     return s;
 388 }