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