ioport.c 9.09 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
/*
 * splitted out ioport related stuffs from vl.c.
 */

28
#include "exec/ioport.h"
Prerna Saxena's avatar
Prerna Saxena committed
29
#include "trace.h"
30
#include "exec/memory.h"
31
#include "exec/address-spaces.h"
32 33 34 35 36 37 38 39 40

//#define DEBUG_IOPORT

#ifdef DEBUG_IOPORT
#  define LOG_IOPORT(...) qemu_log_mask(CPU_LOG_IOPORT, ## __VA_ARGS__)
#else
#  define LOG_IOPORT(...) do { } while (0)
#endif

41 42 43 44 45 46
typedef struct MemoryRegionPortioList {
    MemoryRegion mr;
    void *portio_opaque;
    MemoryRegionPortio ports[];
} MemoryRegionPortioList;

47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
{
    return -1ULL;
}

static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
                                unsigned size)
{
}

const MemoryRegionOps unassigned_io_ops = {
    .read = unassigned_io_read,
    .write = unassigned_io_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

63
void cpu_outb(pio_addr_t addr, uint8_t val)
64
{
65
    LOG_IOPORT("outb: %04"FMT_pioaddr" %02"PRIx8"\n", addr, val);
Prerna Saxena's avatar
Prerna Saxena committed
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 73
    uint8_t buf[2];

74
    LOG_IOPORT("outw: %04"FMT_pioaddr" %04"PRIx16"\n", addr, val);
Prerna Saxena's avatar
Prerna Saxena committed
75
    trace_cpu_out(addr, val);
76 77
    stw_p(buf, val);
    address_space_write(&address_space_io, addr, buf, 2);
78 79
}

80
void cpu_outl(pio_addr_t addr, uint32_t val)
81
{
82 83
    uint8_t buf[4];

84
    LOG_IOPORT("outl: %04"FMT_pioaddr" %08"PRIx32"\n", addr, val);
Prerna Saxena's avatar
Prerna Saxena committed
85
    trace_cpu_out(addr, val);
86 87
    stl_p(buf, val);
    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);
Prerna Saxena's avatar
Prerna Saxena committed
95
    trace_cpu_in(addr, val);
96
    LOG_IOPORT("inb : %04"FMT_pioaddr" %02"PRIx8"\n", addr, val);
97 98 99
    return val;
}

100
uint16_t cpu_inw(pio_addr_t addr)
101
{
102
    uint8_t buf[2];
103
    uint16_t val;
104 105 106

    address_space_read(&address_space_io, addr, buf, 2);
    val = lduw_p(buf);
Prerna Saxena's avatar
Prerna Saxena committed
107
    trace_cpu_in(addr, val);
108
    LOG_IOPORT("inw : %04"FMT_pioaddr" %04"PRIx16"\n", addr, val);
109 110 111
    return val;
}

112
uint32_t cpu_inl(pio_addr_t addr)
113
{
114
    uint8_t buf[4];
115
    uint32_t val;
116 117 118

    address_space_read(&address_space_io, addr, buf, 4);
    val = ldl_p(buf);
Prerna Saxena's avatar
Prerna Saxena committed
119
    trace_cpu_in(addr, val);
120
    LOG_IOPORT("inl : %04"FMT_pioaddr" %08"PRIx32"\n", addr, val);
121 122
    return val;
}
Avi Kivity's avatar
Avi Kivity committed
123 124

void portio_list_init(PortioList *piolist,
125
                      Object *owner,
Avi Kivity's avatar
Avi Kivity committed
126 127 128 129 130 131 132 133 134 135 136 137 138 139
                      const MemoryRegionPortio *callbacks,
                      void *opaque, const char *name)
{
    unsigned n = 0;

    while (callbacks[n].size) {
        ++n;
    }

    piolist->ports = callbacks;
    piolist->nr = 0;
    piolist->regions = g_new0(MemoryRegion *, n);
    piolist->address_space = NULL;
    piolist->opaque = opaque;
140
    piolist->owner = owner;
Avi Kivity's avatar
Avi Kivity committed
141
    piolist->name = name;
142 143 144 145 146 147
    piolist->flush_coalesced_mmio = false;
}

void portio_list_set_flush_coalesced(PortioList *piolist)
{
    piolist->flush_coalesced_mmio = true;
Avi Kivity's avatar
Avi Kivity committed
148 149 150 151
}

void portio_list_destroy(PortioList *piolist)
{
152 153 154 155 156
    MemoryRegionPortioList *mrpio;
    unsigned i;

    for (i = 0; i < piolist->nr; ++i) {
        mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
157
        object_unparent(OBJECT(&mrpio->mr));
158 159
        g_free(mrpio);
    }
Avi Kivity's avatar
Avi Kivity committed
160 161 162
    g_free(piolist->regions);
}

163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
static const MemoryRegionPortio *find_portio(MemoryRegionPortioList *mrpio,
                                             uint64_t offset, unsigned size,
                                             bool write)
{
    const MemoryRegionPortio *mrp;

    for (mrp = mrpio->ports; mrp->size; ++mrp) {
        if (offset >= mrp->offset && offset < mrp->offset + mrp->len &&
            size == mrp->size &&
            (write ? (bool)mrp->write : (bool)mrp->read)) {
            return mrp;
        }
    }
    return NULL;
}

static uint64_t portio_read(void *opaque, hwaddr addr, unsigned size)
{
    MemoryRegionPortioList *mrpio = opaque;
    const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, false);
    uint64_t data;

    data = ((uint64_t)1 << (size * 8)) - 1;
    if (mrp) {
        data = mrp->read(mrpio->portio_opaque, mrp->base + addr);
    } else if (size == 2) {
        mrp = find_portio(mrpio, addr, 1, false);
        assert(mrp);
        data = mrp->read(mrpio->portio_opaque, mrp->base + addr) |
                (mrp->read(mrpio->portio_opaque, mrp->base + addr + 1) << 8);
    }
    return data;
}

static void portio_write(void *opaque, hwaddr addr, uint64_t data,
                         unsigned size)
{
    MemoryRegionPortioList *mrpio = opaque;
    const MemoryRegionPortio *mrp = find_portio(mrpio, addr, size, true);

    if (mrp) {
        mrp->write(mrpio->portio_opaque, mrp->base + addr, data);
    } else if (size == 2) {
        mrp = find_portio(mrpio, addr, 1, true);
        assert(mrp);
        mrp->write(mrpio->portio_opaque, mrp->base + addr, data & 0xff);
        mrp->write(mrpio->portio_opaque, mrp->base + addr + 1, data >> 8);
    }
}

static const MemoryRegionOps portio_ops = {
    .read = portio_read,
    .write = portio_write,
216
    .endianness = DEVICE_LITTLE_ENDIAN,
217 218 219 220
    .valid.unaligned = true,
    .impl.unaligned = true,
};

Avi Kivity's avatar
Avi Kivity committed
221 222 223 224 225
static void portio_list_add_1(PortioList *piolist,
                              const MemoryRegionPortio *pio_init,
                              unsigned count, unsigned start,
                              unsigned off_low, unsigned off_high)
{
226
    MemoryRegionPortioList *mrpio;
Avi Kivity's avatar
Avi Kivity committed
227 228 229
    unsigned i;

    /* Copy the sub-list and null-terminate it.  */
230 231 232 233 234
    mrpio = g_malloc0(sizeof(MemoryRegionPortioList) +
                      sizeof(MemoryRegionPortio) * (count + 1));
    mrpio->portio_opaque = piolist->opaque;
    memcpy(mrpio->ports, pio_init, sizeof(MemoryRegionPortio) * count);
    memset(mrpio->ports + count, 0, sizeof(MemoryRegionPortio));
Avi Kivity's avatar
Avi Kivity committed
235 236 237

    /* Adjust the offsets to all be zero-based for the region.  */
    for (i = 0; i < count; ++i) {
238 239
        mrpio->ports[i].offset -= off_low;
        mrpio->ports[i].base = start + off_low;
Avi Kivity's avatar
Avi Kivity committed
240 241
    }

242 243 244 245
    /*
     * Use an alias so that the callback is called with an absolute address,
     * rather than an offset relative to to start + off_low.
     */
246 247
    memory_region_init_io(&mrpio->mr, piolist->owner, &portio_ops, mrpio,
                          piolist->name, off_high - off_low);
248 249 250
    if (piolist->flush_coalesced_mmio) {
        memory_region_set_flush_coalesced(&mrpio->mr);
    }
Avi Kivity's avatar
Avi Kivity committed
251
    memory_region_add_subregion(piolist->address_space,
252 253
                                start + off_low, &mrpio->mr);
    piolist->regions[piolist->nr] = &mrpio->mr;
254
    ++piolist->nr;
Avi Kivity's avatar
Avi Kivity committed
255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
}

void portio_list_add(PortioList *piolist,
                     MemoryRegion *address_space,
                     uint32_t start)
{
    const MemoryRegionPortio *pio, *pio_start = piolist->ports;
    unsigned int off_low, off_high, off_last, count;

    piolist->address_space = address_space;

    /* Handle the first entry specially.  */
    off_last = off_low = pio_start->offset;
    off_high = off_low + pio_start->len;
    count = 1;

    for (pio = pio_start + 1; pio->size != 0; pio++, count++) {
        /* All entries must be sorted by offset.  */
        assert(pio->offset >= off_last);
        off_last = pio->offset;

        /* If we see a hole, break the region.  */
        if (off_last > off_high) {
            portio_list_add_1(piolist, pio_start, count, start, off_low,
                              off_high);
            /* ... and start collecting anew.  */
            pio_start = pio;
            off_low = off_last;
            off_high = off_low + pio->len;
            count = 0;
        } else if (off_last + pio->len > off_high) {
            off_high = off_last + pio->len;
        }
    }

    /* There will always be an open sub-list.  */
    portio_list_add_1(piolist, pio_start, count, start, off_low, off_high);
}

void portio_list_del(PortioList *piolist)
{
296
    MemoryRegionPortioList *mrpio;
Avi Kivity's avatar
Avi Kivity committed
297 298 299
    unsigned i;

    for (i = 0; i < piolist->nr; ++i) {
300 301
        mrpio = container_of(piolist->regions[i], MemoryRegionPortioList, mr);
        memory_region_del_subregion(piolist->address_space, &mrpio->mr);
Avi Kivity's avatar
Avi Kivity committed
302 303
    }
}