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 "vl.h"
  25
  26 /* debug iommu */
  27 //#define DEBUG_IOMMU
  28
  29 #ifdef DEBUG_IOMMU
  30 #define DPRINTF(fmt, args...) \
  31 do { printf("IOMMU: " fmt , ##args); } while (0)
  32 #else
  33 #define DPRINTF(fmt, args...)
  34 #endif
  35
  36 #define IOMMU_NREGS (3*4096/4)
  37 #define IOMMU_CTRL          (0x0000 >> 2)
  38 #define IOMMU_CTRL_IMPL     0xf0000000 /* Implementation */
  39 #define IOMMU_CTRL_VERS     0x0f000000 /* Version */
  40 #define IOMMU_VERSION       0x04000000
  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_SBCFG0        (0x1010 >> 2) /* SBUS configration per-slot */
  63 #define IOMMU_SBCFG1        (0x1014 >> 2) /* SBUS configration per-slot */
  64 #define IOMMU_SBCFG2        (0x1018 >> 2) /* SBUS configration per-slot */
  65 #define IOMMU_SBCFG3        (0x101c >> 2) /* SBUS configration per-slot */
  66 #define IOMMU_SBCFG_SAB30   0x00010000 /* Phys-address bit 30 when bypass enabled */
  67 #define IOMMU_SBCFG_BA16    0x00000004 /* Slave supports 16 byte bursts */
  68 #define IOMMU_SBCFG_BA8     0x00000002 /* Slave supports 8 byte bursts */
  69 #define IOMMU_SBCFG_BYPASS  0x00000001 /* Bypass IOMMU, treat all addresses
  70                                           produced by this device as pure
  71                                           physical. */
  72 #define IOMMU_SBCFG_MASK    0x00010003
  73
  74 #define IOMMU_ARBEN         (0x2000 >> 2) /* SBUS arbitration enable */
  75 #define IOMMU_ARBEN_MASK    0x001f0000
  76 #define IOMMU_MID           0x00000008
  77
  78 /* The format of an iopte in the page tables */
  79 #define IOPTE_PAGE          0x07ffff00 /* Physical page number (PA[30:12]) */
  80 #define IOPTE_CACHE         0x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */
  81 #define IOPTE_WRITE         0x00000004 /* Writeable */
  82 #define IOPTE_VALID         0x00000002 /* IOPTE is valid */
  83 #define IOPTE_WAZ           0x00000001 /* Write as zeros */
  84
  85 #define PAGE_SHIFT      12
  86 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  87 #define PAGE_MASK       (PAGE_SIZE - 1)
  88
  89 typedef struct IOMMUState {
  90     uint32_t addr;
  91     uint32_t regs[IOMMU_NREGS];
  92     uint32_t iostart;
  93 } IOMMUState;
  94
  95 static uint32_t iommu_mem_readw(void *opaque, target_phys_addr_t addr)
  96 {
  97     IOMMUState *s = opaque;
  98     uint32_t saddr;
  99
 100     saddr = (addr - s->addr) >> 2;
 101     switch (saddr) {
 102     default:
 103         DPRINTF("read reg[%d] = %x\n", saddr, s->regs[saddr]);
 104         return s->regs[saddr];
 105         break;
 106     }
 107     return 0;
 108 }
 109
 110 static void iommu_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
 111 {
 112     IOMMUState *s = opaque;
 113     uint32_t saddr;
 114
 115     saddr = (addr - s->addr) >> 2;
 116     DPRINTF("write reg[%d] = %x\n", saddr, val);
 117     switch (saddr) {
 118     case IOMMU_CTRL:
 119         switch (val & IOMMU_CTRL_RNGE) {
 120         case IOMMU_RNGE_16MB:
 121             s->iostart = 0xff000000;
 122             break;
 123         case IOMMU_RNGE_32MB:
 124             s->iostart = 0xfe000000;
 125             break;
 126         case IOMMU_RNGE_64MB:
 127             s->iostart = 0xfc000000;
 128             break;
 129         case IOMMU_RNGE_128MB:
 130             s->iostart = 0xf8000000;
 131             break;
 132         case IOMMU_RNGE_256MB:
 133             s->iostart = 0xf0000000;
 134             break;
 135         case IOMMU_RNGE_512MB:
 136             s->iostart = 0xe0000000;
 137             break;
 138         case IOMMU_RNGE_1GB:
 139             s->iostart = 0xc0000000;
 140             break;
 141         default:
 142         case IOMMU_RNGE_2GB:
 143             s->iostart = 0x80000000;
 144             break;
 145         }
 146         DPRINTF("iostart = %x\n", s->iostart);
 147         s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | IOMMU_VERSION);
 148         break;
 149     case IOMMU_BASE:
 150         s->regs[saddr] = val & IOMMU_BASE_MASK;
 151         break;
 152     case IOMMU_TLBFLUSH:
 153         DPRINTF("tlb flush %x\n", val);
 154         s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;
 155         break;
 156     case IOMMU_PGFLUSH:
 157         DPRINTF("page flush %x\n", val);
 158         s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;
 159         break;
 160     case IOMMU_SBCFG0:
 161     case IOMMU_SBCFG1:
 162     case IOMMU_SBCFG2:
 163     case IOMMU_SBCFG3:
 164         s->regs[saddr] = val & IOMMU_SBCFG_MASK;
 165         break;
 166     case IOMMU_ARBEN:
 167         // XXX implement SBus probing: fault when reading unmapped
 168         // addresses, fault cause and address stored to MMU/IOMMU
 169         s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;
 170         break;
 171     default:
 172         s->regs[saddr] = val;
 173         break;
 174     }
 175 }
 176
 177 static CPUReadMemoryFunc *iommu_mem_read[3] = {
 178     iommu_mem_readw,
 179     iommu_mem_readw,
 180     iommu_mem_readw,
 181 };
 182
 183 static CPUWriteMemoryFunc *iommu_mem_write[3] = {
 184     iommu_mem_writew,
 185     iommu_mem_writew,
 186     iommu_mem_writew,
 187 };
 188
 189 static uint32_t iommu_page_get_flags(IOMMUState *s, uint32_t addr)
 190 {
 191     uint32_t iopte;
 192
 193     iopte = s->regs[1] << 4;
 194     addr &= ~s->iostart;
 195     iopte += (addr >> (PAGE_SHIFT - 2)) & ~3;
 196     return ldl_phys(iopte);
 197 }
 198
 199 static uint32_t iommu_translate_pa(IOMMUState *s, uint32_t addr, uint32_t pa)
 200 {
 201     uint32_t tmppte;
 202
 203     tmppte = pa;
 204     pa = ((pa & IOPTE_PAGE) << 4) + (addr & PAGE_MASK);
 205     DPRINTF("xlate dva %x => pa %x (iopte = %x)\n", addr, pa, tmppte);
 206     return pa;
 207 }
 208
 209 void sparc_iommu_memory_rw(void *opaque, target_phys_addr_t addr,
 210                            uint8_t *buf, int len, int is_write)
 211 {
 212     int l, flags;
 213     target_ulong page, phys_addr;
 214
 215     while (len > 0) {
 216         page = addr & TARGET_PAGE_MASK;
 217         l = (page + TARGET_PAGE_SIZE) - addr;
 218         if (l > len)
 219             l = len;
 220         flags = iommu_page_get_flags(opaque, page);
 221         if (!(flags & IOPTE_VALID))
 222             return;
 223         phys_addr = iommu_translate_pa(opaque, addr, flags);
 224         if (is_write) {
 225             if (!(flags & IOPTE_WRITE))
 226                 return;
 227             cpu_physical_memory_write(phys_addr, buf, len);
 228         } else {
 229             cpu_physical_memory_read(phys_addr, buf, len);
 230         }
 231         len -= l;
 232         buf += l;
 233         addr += l;
 234     }
 235 }
 236
 237 static void iommu_save(QEMUFile *f, void *opaque)
 238 {
 239     IOMMUState *s = opaque;
 240     int i;
 241
 242     qemu_put_be32s(f, &s->addr);
 243     for (i = 0; i < IOMMU_NREGS; i++)
 244         qemu_put_be32s(f, &s->regs[i]);
 245     qemu_put_be32s(f, &s->iostart);
 246 }
 247
 248 static int iommu_load(QEMUFile *f, void *opaque, int version_id)
 249 {
 250     IOMMUState *s = opaque;
 251     int i;
 252
 253     if (version_id != 1)
 254         return -EINVAL;
 255
 256     qemu_get_be32s(f, &s->addr);
 257     for (i = 0; i < IOMMU_NREGS; i++)
 258         qemu_put_be32s(f, &s->regs[i]);
 259     qemu_get_be32s(f, &s->iostart);
 260
 261     return 0;
 262 }
 263
 264 static void iommu_reset(void *opaque)
 265 {
 266     IOMMUState *s = opaque;
 267
 268     memset(s->regs, 0, IOMMU_NREGS * 4);
 269     s->iostart = 0;
 270     s->regs[0] = IOMMU_VERSION;
 271 }
 272
 273 void *iommu_init(uint32_t addr)
 274 {
 275     IOMMUState *s;
 276     int iommu_io_memory;
 277
 278     s = qemu_mallocz(sizeof(IOMMUState));
 279     if (!s)
 280         return NULL;
 281
 282     s->addr = addr;
 283
 284     iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read, iommu_mem_write, s);
 285     cpu_register_physical_memory(addr, IOMMU_NREGS * 4, iommu_io_memory);
 286
 287     register_savevm("iommu", addr, 1, iommu_save, iommu_load, s);
 288     qemu_register_reset(iommu_reset, s);
 289     return s;
 290 }
 291