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