system/ioport.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 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  * split out ioport related stuffs from vl.c.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "exec/ioport.h"
  31 #include "exec/memory.h"
  32 #include "exec/address-spaces.h"
  33 #include "trace.h"
  34
  35 struct MemoryRegionPortioList {
  36     Object obj;
  37
  38     MemoryRegion mr;
  39     void *portio_opaque;
  40     MemoryRegionPortio *ports;
  41 };
  42
  43 #define TYPE_MEMORY_REGION_PORTIO_LIST "memory-region-portio-list"
  44 OBJECT_DECLARE_SIMPLE_TYPE(MemoryRegionPortioList, MEMORY_REGION_PORTIO_LIST)
  45
  46 static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
  47 {
  48     return -1ULL;
  49 }
  50
  51 static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
  52                                 unsigned size)
  53 {
  54 }
  55
  56 const MemoryRegionOps unassigned_io_ops = {
  57     .read = unassigned_io_read,
  58     .write = unassigned_io_write,
  59     .endianness = DEVICE_NATIVE_ENDIAN,
  60 };
  61
  62 void cpu_outb(uint32_t addr, uint8_t val)
  63 {
  64     trace_cpu_out(addr, 'b', val);
  65     address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
  66                         &val, 1);
  67 }
  68
  69 void cpu_outw(uint32_t addr, uint16_t val)
  70 {
  71     uint8_t buf[2];
  72
  73     trace_cpu_out(addr, 'w', val);
  74     stw_p(buf, val);
  75     address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
  76                         buf, 2);
  77 }
  78
  79 void cpu_outl(uint32_t addr, uint32_t val)
  80 {
  81     uint8_t buf[4];
  82
  83     trace_cpu_out(addr, 'l', val);
  84     stl_p(buf, val);
  85     address_space_write(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
  86                         buf, 4);
  87 }
  88
  89 uint8_t cpu_inb(uint32_t addr)
  90 {
  91     uint8_t val;
  92
  93     address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED,
  94                        &val, 1);
  95     trace_cpu_in(addr, 'b', val);
  96     return val;
  97 }
  98
  99 uint16_t cpu_inw(uint32_t addr)
 100 {
 101     uint8_t buf[2];
 102     uint16_t val;
 103
 104     address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 2);
 105     val = lduw_p(buf);
 106     trace_cpu_in(addr, 'w', val);
 107     return val;
 108 }
 109
 110 uint32_t cpu_inl(uint32_t addr)
 111 {
 112     uint8_t buf[4];
 113     uint32_t val;
 114
 115     address_space_read(&address_space_io, addr, MEMTXATTRS_UNSPECIFIED, buf, 4);
 116     val = ldl_p(buf);
 117     trace_cpu_in(addr, 'l', val);
 118     return val;
 119 }
 120
 121 void portio_list_init(PortioList *piolist,
 122                       Object *owner,
 123                       const MemoryRegionPortio *callbacks,
 124                       void *opaque, const char *name)
 125 {
 126     unsigned n = 0;
 127
 128     while (callbacks[n].size) {
 129         ++n;
 130     }
 131
 132     piolist->ports = callbacks;
 133     piolist->nr = 0;
 134     piolist->regions = g_new0(MemoryRegion *, n);
 135     piolist->address_space = NULL;
 136     piolist->opaque = opaque;
 137     piolist->owner = owner;
 138     piolist->name = name;
 139     piolist->flush_coalesced_mmio = false;
 140 }
 141
 142 void portio_list_set_flush_coalesced(PortioList *piolist)
 143 {
 144     piolist->flush_coalesced_mmio = true;
 145 }
 146
 147 void portio_list_destroy(PortioList *piolist)
 148 {
 149     MemoryRegionPortioList *mrpio;
 150     unsigned i;
 151
 152     for (i = 0; i < piolist->nr; ++i) {
 153         mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
 154         object_unparent(OBJECT(&mrpio->mr));
 155         object_unref(mrpio);
 156     }
 157     g_free(piolist->regions);
 158 }
 159
 160 static const MemoryRegionPortio *find_portio(MemoryRegionPortioList *mrpio,
 161                                              uint64_t offset, unsigned size,
 162                                              bool write)
 163 {
 164     const MemoryRegionPortio *mrp;
 165
 166     for (mrp = mrpio->ports; mrp->size; ++mrp) {
 167         if (offset >= mrp->offset && offset < mrp->offset + mrp->len &&
 168             size == mrp->size &&
 169             (write ? (bool)mrp->write : (bool)mrp->read)) {
 170             return mrp;
 171         }
 172     }
 173     return NULL;
 174 }
 175
 176 static uint64_t portio_read(void *opaque, hwaddr addr, unsigned size)
 177 {
 178     MemoryRegionPortioList *mrpio = opaque;
 179     const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, false);
 180     uint64_t data;
 181
 182     data = ((uint64_t)1 << (size * 8)) - 1;
 183     if (mrp) {
 184         data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
 185     } else if (size == 2) {
 186         mrp = find_portio(mrpio, addr, 1, false);
 187         if (mrp) {
 188             data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
 189             if (addr + 1 < mrp->offset + mrp->len) {
 190                 data |= mrp->read(mrpio->portio_opaque, mrp->base + addr + 1) << 8;
 191             } else {
 192                 data |= 0xff00;
 193             }
 194         }
 195     }
 196     return data;
 197 }
 198
 199 static void portio_write(void *opaque, hwaddr addr, uint64_t data,
 200                          unsigned size)
 201 {
 202     MemoryRegionPortioList *mrpio = opaque;
 203     const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, true);
 204
 205     if (mrp) {
 206         mrp->write(mrpio->portio_opaque, mrp->base + addr, data);
 207     } else if (size == 2) {
 208         mrp = find_portio(mrpio, addr, 1, true);
 209         if (mrp) {
 210             mrp->write(mrpio->portio_opaque, mrp->base + addr, data & 0xff);
 211             if (addr + 1 < mrp->offset + mrp->len) {
 212                 mrp->write(mrpio->portio_opaque, mrp->base + addr + 1, data >> 8);
 213             }
 214         }
 215     }
 216 }
 217
 218 static const MemoryRegionOps portio_ops = {
 219     .read = portio_read,
 220     .write = portio_write,
 221     .endianness = DEVICE_LITTLE_ENDIAN,
 222     .valid.unaligned = true,
 223     .impl.unaligned = true,
 224 };
 225
 226 static void portio_list_add_1(PortioList *piolist,
 227                               const MemoryRegionPortio *pio_init,
 228                               unsigned count, unsigned start,
 229                               unsigned off_low, unsigned off_high)
 230 {
 231     MemoryRegionPortioList *mrpio;
 232     Object *owner;
 233     char *name;
 234     unsigned i;
 235
 236     /* Copy the sub-list and null-terminate it.  */
 237     mrpio = MEMORY_REGION_PORTIO_LIST(
 238                 object_new(TYPE_MEMORY_REGION_PORTIO_LIST));
 239     mrpio->portio_opaque = piolist->opaque;
 240     mrpio->ports = g_malloc0(sizeof(MemoryRegionPortio) * (count + 1));
 241     memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
 242     memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
 243
 244     /* Adjust the offsets to all be zero-based for the region.  */
 245     for (i = 0; i < count; ++i) {
 246         mrpio->ports[i].offset -= off_low;
 247         mrpio->ports[i].base = start + off_low;
 248     }
 249
 250     /*
 251      * The MemoryRegion owner is the MemoryRegionPortioList since that manages
 252      * the lifecycle via the refcount
 253      */
 254     memory_region_init_io(&mrpio->mr, OBJECT(mrpio), &portio_ops, mrpio,
 255                           piolist->name, off_high - off_low);
 256
 257     /* Reparent the MemoryRegion to the piolist owner */
 258     object_ref(&mrpio->mr);
 259     object_unparent(OBJECT(&mrpio->mr));
 260     if (!piolist->owner) {
 261         owner = container_get(qdev_get_machine(), "/unattached");
 262     } else {
 263         owner = piolist->owner;
 264     }
 265     name = g_strdup_printf("%s[*]", piolist->name);
 266     object_property_add_child(owner, name, OBJECT(&mrpio->mr));
 267     g_free(name);
 268
 269     if (piolist->flush_coalesced_mmio) {
 270         memory_region_set_flush_coalesced(&mrpio->mr);
 271     }
 272     memory_region_add_subregion(piolist->address_space,
 273                                 start + off_low, &mrpio->mr);
 274     piolist->regions[piolist->nr] = &mrpio->mr;
 275     ++piolist->nr;
 276 }
 277
 278 void portio_list_add(PortioList *piolist,
 279                      MemoryRegion *address_space,
 280                      uint32_t start)
 281 {
 282     const MemoryRegionPortio *pio, *pio_start = piolist->ports;
 283     unsigned int off_low, off_high, off_last, count;
 284
 285     piolist->address_space = address_space;
 286
 287     /* Handle the first entry specially.  */
 288     off_last = off_low = pio_start->offset;
 289     off_high = off_low + pio_start->len + pio_start->size - 1;
 290     count = 1;
 291
 292     for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
 293         /* All entries must be sorted by offset.  */
 294         assert(pio->offset >= off_last);
 295         off_last = pio->offset;
 296
 297         /* If we see a hole, break the region.  */
 298         if (off_last > off_high) {
 299             portio_list_add_1(piolist, pio_start, count, start, off_low,
 300                               off_high);
 301             /* ... and start collecting anew.  */
 302             pio_start = pio;
 303             off_low = off_last;
 304             off_high = off_low + pio->len + pio_start->size - 1;
 305             count = 0;
 306         } else if (off_last + pio->len > off_high) {
 307             off_high = off_last + pio->len + pio_start->size - 1;
 308         }
 309     }
 310
 311     /* There will always be an open sub-list.  */
 312     portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
 313 }
 314
 315 void portio_list_del(PortioList *piolist)
 316 {
 317     MemoryRegionPortioList *mrpio;
 318     unsigned i;
 319
 320     for (i = 0; i < piolist->nr; ++i) {
 321         mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
 322         memory_region_del_subregion(piolist->address_space, &mrpio->mr);
 323     }
 324 }
 325
 326 static void memory_region_portio_list_finalize(Object *obj)
 327 {
 328     MemoryRegionPortioList *mrpio = MEMORY_REGION_PORTIO_LIST(obj);
 329
 330     object_unref(&mrpio->mr);
 331     g_free(mrpio->ports);
 332 }
 333
 334 static const TypeInfo memory_region_portio_list_info = {
 335     .parent             = TYPE_OBJECT,
 336     .name               = TYPE_MEMORY_REGION_PORTIO_LIST,
 337     .instance_size      = sizeof(MemoryRegionPortioList),
 338     .instance_finalize  = memory_region_portio_list_finalize,
 339 };
 340
 341 static void ioport_register_types(void)
 342 {
 343     type_register_static(&memory_region_portio_list_info);
 344 }
 345
 346 type_init(ioport_register_types)