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