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 "exec/ioport.h"
  29 #include "trace.h"
  30 #include "exec/memory.h"
  31 #include "exec/address-spaces.h"
  32
  33 //#define DEBUG_IOPORT
  34
  35 #ifdef DEBUG_IOPORT
  36 #  define LOG_IOPORT(...) qemu_log_mask(CPU_LOG_IOPORT, ## __VA_ARGS__)
  37 #else
  38 #  define LOG_IOPORT(...) do { } while (0)
  39 #endif
  40
  41 typedef struct MemoryRegionPortioList {
  42     MemoryRegion mr;
  43     void *portio_opaque;
  44     MemoryRegionPortio ports[];
  45 } MemoryRegionPortioList;
  46
  47 static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
  48 {
  49     return -1ULL;
  50 }
  51
  52 static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
  53                                 unsigned size)
  54 {
  55 }
  56
  57 const MemoryRegionOps unassigned_io_ops = {
  58     .read = unassigned_io_read,
  59     .write = unassigned_io_write,
  60     .endianness = DEVICE_NATIVE_ENDIAN,
  61 };
  62
  63 void cpu_outb(pio_addr_t addr, uint8_t val)
  64 {
  65     LOG_IOPORT("outb: %04"FMT_pioaddr" %02"PRIx8"\n", addr, val);
  66     trace_cpu_out(addr, val);
  67     address_space_write(&address_space_io, addr, &val, 1);
  68 }
  69
  70 void cpu_outw(pio_addr_t addr, uint16_t val)
  71 {
  72     uint8_t buf[2];
  73
  74     LOG_IOPORT("outw: %04"FMT_pioaddr" %04"PRIx16"\n", addr, val);
  75     trace_cpu_out(addr, val);
  76     stw_p(buf, val);
  77     address_space_write(&address_space_io, addr, buf, 2);
  78 }
  79
  80 void cpu_outl(pio_addr_t addr, uint32_t val)
  81 {
  82     uint8_t buf[4];
  83
  84     LOG_IOPORT("outl: %04"FMT_pioaddr" %08"PRIx32"\n", addr, val);
  85     trace_cpu_out(addr, val);
  86     stl_p(buf, val);
  87     address_space_write(&address_space_io, addr, buf, 4);
  88 }
  89
  90 uint8_t cpu_inb(pio_addr_t addr)
  91 {
  92     uint8_t val;
  93
  94     address_space_read(&address_space_io, addr, &val, 1);
  95     trace_cpu_in(addr, val);
  96     LOG_IOPORT("inb : %04"FMT_pioaddr" %02"PRIx8"\n", addr, val);
  97     return val;
  98 }
  99
 100 uint16_t cpu_inw(pio_addr_t addr)
 101 {
 102     uint8_t buf[2];
 103     uint16_t val;
 104
 105     address_space_read(&address_space_io, addr, buf, 2);
 106     val = lduw_p(buf);
 107     trace_cpu_in(addr, val);
 108     LOG_IOPORT("inw : %04"FMT_pioaddr" %04"PRIx16"\n", addr, val);
 109     return val;
 110 }
 111
 112 uint32_t cpu_inl(pio_addr_t addr)
 113 {
 114     uint8_t buf[4];
 115     uint32_t val;
 116
 117     address_space_read(&address_space_io, addr, buf, 4);
 118     val = ldl_p(buf);
 119     trace_cpu_in(addr, val);
 120     LOG_IOPORT("inl : %04"FMT_pioaddr" %08"PRIx32"\n", addr, val);
 121     return val;
 122 }
 123
 124 void portio_list_init(PortioList *piolist,
 125                       Object *owner,
 126                       const MemoryRegionPortio *callbacks,
 127                       void *opaque, const char *name)
 128 {
 129     unsigned n = 0;
 130
 131     while (callbacks[n].size) {
 132         ++n;
 133     }
 134
 135     piolist->ports = callbacks;
 136     piolist->nr = 0;
 137     piolist->regions = g_new0(MemoryRegion *, n);
 138     piolist->address_space = NULL;
 139     piolist->opaque = opaque;
 140     piolist->owner = owner;
 141     piolist->name = name;
 142 }
 143
 144 void portio_list_destroy(PortioList *piolist)
 145 {
 146     g_free(piolist->regions);
 147 }
 148
 149 static const MemoryRegionPortio *find_portio(MemoryRegionPortioList *mrpio,
 150                                              uint64_t offset, unsigned size,
 151                                              bool write)
 152 {
 153     const MemoryRegionPortio *mrp;
 154
 155     for (mrp = mrpio->ports; mrp->size; ++mrp) {
 156         if (offset >= mrp->offset && offset < mrp->offset + mrp->len &&
 157             size == mrp->size &&
 158             (write ? (bool)mrp->write : (bool)mrp->read)) {
 159             return mrp;
 160         }
 161     }
 162     return NULL;
 163 }
 164
 165 static uint64_t portio_read(void *opaque, hwaddr addr, unsigned size)
 166 {
 167     MemoryRegionPortioList *mrpio = opaque;
 168     const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, false);
 169     uint64_t data;
 170
 171     data = ((uint64_t)1 << (size * 8)) - 1;
 172     if (mrp) {
 173         data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
 174     } else if (size == 2) {
 175         mrp = find_portio(mrpio, addr, 1, false);
 176         assert(mrp);
 177         data = mrp->read(mrpio->portio_opaque, mrp->base + addr) |
 178                 (mrp->read(mrpio->portio_opaque, mrp->base + addr + 1) << 8);
 179     }
 180     return data;
 181 }
 182
 183 static void portio_write(void *opaque, hwaddr addr, uint64_t data,
 184                          unsigned size)
 185 {
 186     MemoryRegionPortioList *mrpio = opaque;
 187     const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, true);
 188
 189     if (mrp) {
 190         mrp->write(mrpio->portio_opaque, mrp->base + addr, data);
 191     } else if (size == 2) {
 192         mrp = find_portio(mrpio, addr, 1, true);
 193         assert(mrp);
 194         mrp->write(mrpio->portio_opaque, mrp->base + addr, data & 0xff);
 195         mrp->write(mrpio->portio_opaque, mrp->base + addr + 1, data >> 8);
 196     }
 197 }
 198
 199 static const MemoryRegionOps portio_ops = {
 200     .read = portio_read,
 201     .write = portio_write,
 202     .endianness = DEVICE_LITTLE_ENDIAN,
 203     .valid.unaligned = true,
 204     .impl.unaligned = true,
 205 };
 206
 207 static void portio_list_add_1(PortioList *piolist,
 208                               const MemoryRegionPortio *pio_init,
 209                               unsigned count, unsigned start,
 210                               unsigned off_low, unsigned off_high)
 211 {
 212     MemoryRegionPortioList *mrpio;
 213     unsigned i;
 214
 215     /* Copy the sub-list and null-terminate it.  */
 216     mrpio = g_malloc0(sizeof(MemoryRegionPortioList) +
 217                       sizeof(MemoryRegionPortio) * (count + 1));
 218     mrpio->portio_opaque = piolist->opaque;
 219     memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
 220     memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
 221
 222     /* Adjust the offsets to all be zero-based for the region.  */
 223     for (i = 0; i < count; ++i) {
 224         mrpio->ports[i].offset -= off_low;
 225         mrpio->ports[i].base = start + off_low;
 226     }
 227
 228     /*
 229      * Use an alias so that the callback is called with an absolute address,
 230      * rather than an offset relative to to start + off_low.
 231      */
 232     memory_region_init_io(&mrpio->mr, piolist->owner, &portio_ops, mrpio,
 233                           piolist->name, off_high - off_low);
 234     memory_region_add_subregion(piolist->address_space,
 235                                 start + off_low, &mrpio->mr);
 236     piolist->regions[piolist->nr] = &mrpio->mr;
 237     ++piolist->nr;
 238 }
 239
 240 void portio_list_add(PortioList *piolist,
 241                      MemoryRegion *address_space,
 242                      uint32_t start)
 243 {
 244     const MemoryRegionPortio *pio, *pio_start = piolist->ports;
 245     unsigned int off_low, off_high, off_last, count;
 246
 247     piolist->address_space = address_space;
 248
 249     /* Handle the first entry specially.  */
 250     off_last = off_low = pio_start->offset;
 251     off_high = off_low + pio_start->len;
 252     count = 1;
 253
 254     for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
 255         /* All entries must be sorted by offset.  */
 256         assert(pio->offset >= off_last);
 257         off_last = pio->offset;
 258
 259         /* If we see a hole, break the region.  */
 260         if (off_last > off_high) {
 261             portio_list_add_1(piolist, pio_start, count, start, off_low,
 262                               off_high);
 263             /* ... and start collecting anew.  */
 264             pio_start = pio;
 265             off_low = off_last;
 266             off_high = off_low + pio->len;
 267             count = 0;
 268         } else if (off_last + pio->len > off_high) {
 269             off_high = off_last + pio->len;
 270         }
 271     }
 272
 273     /* There will always be an open sub-list.  */
 274     portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
 275 }
 276
 277 void portio_list_del(PortioList *piolist)
 278 {
 279     MemoryRegionPortioList *mrpio;
 280     unsigned i;
 281
 282     for (i = 0; i < piolist->nr; ++i) {
 283         mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
 284         memory_region_del_subregion(piolist->address_space, &mrpio->mr);
 285         memory_region_destroy(&mrpio->mr);
 286         g_free(mrpio);
 287         piolist->regions[i] = NULL;
 288     }
 289 }