hw/fw_cfg.c

   1 /*
   2  * QEMU Firmware configuration device emulation
   3  *
   4  * Copyright (c) 2008 Gleb Natapov
   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 #include "hw.h"
  25 #include "sysemu.h"
  26 #include "isa.h"
  27 #include "fw_cfg.h"
  28 #include "sysbus.h"
  29
  30 /* debug firmware config */
  31 //#define DEBUG_FW_CFG
  32
  33 #ifdef DEBUG_FW_CFG
  34 #define FW_CFG_DPRINTF(fmt, ...)                        \
  35     do { printf("FW_CFG: " fmt , ## __VA_ARGS__); } while (0)
  36 #else
  37 #define FW_CFG_DPRINTF(fmt, ...)
  38 #endif
  39
  40 #define FW_CFG_SIZE 2
  41
  42 typedef struct FWCfgEntry {
  43     uint32_t len;
  44     uint8_t *data;
  45     void *callback_opaque;
  46     FWCfgCallback callback;
  47 } FWCfgEntry;
  48
  49 struct FWCfgState {
  50     SysBusDevice busdev;
  51     uint32_t ctl_iobase, data_iobase;
  52     FWCfgEntry entries[2][FW_CFG_MAX_ENTRY];
  53     FWCfgFiles *files;
  54     uint16_t cur_entry;
  55     uint32_t cur_offset;
  56 };
  57
  58 static void fw_cfg_write(FWCfgState *s, uint8_t value)
  59 {
  60     int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
  61     FWCfgEntry *e = &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
  62
  63     FW_CFG_DPRINTF("write %d\n", value);
  64
  65     if (s->cur_entry & FW_CFG_WRITE_CHANNEL && s->cur_offset < e->len) {
  66         e->data[s->cur_offset++] = value;
  67         if (s->cur_offset == e->len) {
  68             e->callback(e->callback_opaque, e->data);
  69             s->cur_offset = 0;
  70         }
  71     }
  72 }
  73
  74 static int fw_cfg_select(FWCfgState *s, uint16_t key)
  75 {
  76     int ret;
  77
  78     s->cur_offset = 0;
  79     if ((key & FW_CFG_ENTRY_MASK) >= FW_CFG_MAX_ENTRY) {
  80         s->cur_entry = FW_CFG_INVALID;
  81         ret = 0;
  82     } else {
  83         s->cur_entry = key;
  84         ret = 1;
  85     }
  86
  87     FW_CFG_DPRINTF("select key %d (%sfound)\n", key, ret ? "" : "not ");
  88
  89     return ret;
  90 }
  91
  92 static uint8_t fw_cfg_read(FWCfgState *s)
  93 {
  94     int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
  95     FWCfgEntry *e = &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
  96     uint8_t ret;
  97
  98     if (s->cur_entry == FW_CFG_INVALID || !e->data || s->cur_offset >= e->len)
  99         ret = 0;
 100     else
 101         ret = e->data[s->cur_offset++];
 102
 103     FW_CFG_DPRINTF("read %d\n", ret);
 104
 105     return ret;
 106 }
 107
 108 static uint32_t fw_cfg_io_readb(void *opaque, uint32_t addr)
 109 {
 110     return fw_cfg_read(opaque);
 111 }
 112
 113 static void fw_cfg_io_writeb(void *opaque, uint32_t addr, uint32_t value)
 114 {
 115     fw_cfg_write(opaque, (uint8_t)value);
 116 }
 117
 118 static void fw_cfg_io_writew(void *opaque, uint32_t addr, uint32_t value)
 119 {
 120     fw_cfg_select(opaque, (uint16_t)value);
 121 }
 122
 123 static uint32_t fw_cfg_mem_readb(void *opaque, target_phys_addr_t addr)
 124 {
 125     return fw_cfg_read(opaque);
 126 }
 127
 128 static void fw_cfg_mem_writeb(void *opaque, target_phys_addr_t addr,
 129                               uint32_t value)
 130 {
 131     fw_cfg_write(opaque, (uint8_t)value);
 132 }
 133
 134 static void fw_cfg_mem_writew(void *opaque, target_phys_addr_t addr,
 135                               uint32_t value)
 136 {
 137     fw_cfg_select(opaque, (uint16_t)value);
 138 }
 139
 140 static CPUReadMemoryFunc * const fw_cfg_ctl_mem_read[3] = {
 141     NULL,
 142     NULL,
 143     NULL,
 144 };
 145
 146 static CPUWriteMemoryFunc * const fw_cfg_ctl_mem_write[3] = {
 147     NULL,
 148     fw_cfg_mem_writew,
 149     NULL,
 150 };
 151
 152 static CPUReadMemoryFunc * const fw_cfg_data_mem_read[3] = {
 153     fw_cfg_mem_readb,
 154     NULL,
 155     NULL,
 156 };
 157
 158 static CPUWriteMemoryFunc * const fw_cfg_data_mem_write[3] = {
 159     fw_cfg_mem_writeb,
 160     NULL,
 161     NULL,
 162 };
 163
 164 static void fw_cfg_reset(DeviceState *d)
 165 {
 166     FWCfgState *s = DO_UPCAST(FWCfgState, busdev.qdev, d);
 167
 168     fw_cfg_select(s, 0);
 169 }
 170
 171 /* Save restore 32 bit int as uint16_t
 172    This is a Big hack, but it is how the old state did it.
 173    Or we broke compatibility in the state, or we can't use struct tm
 174  */
 175
 176 static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size)
 177 {
 178     uint32_t *v = pv;
 179     *v = qemu_get_be16(f);
 180     return 0;
 181 }
 182
 183 static void put_unused(QEMUFile *f, void *pv, size_t size)
 184 {
 185     fprintf(stderr, "uint32_as_uint16 is only used for backward compatibility.\n");
 186     fprintf(stderr, "This functions shouldn't be called.\n");
 187 }
 188
 189 static const VMStateInfo vmstate_hack_uint32_as_uint16 = {
 190     .name = "int32_as_uint16",
 191     .get  = get_uint32_as_uint16,
 192     .put  = put_unused,
 193 };
 194
 195 #define VMSTATE_UINT16_HACK(_f, _s, _t)                                    \
 196     VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint32_as_uint16, uint32_t)
 197
 198
 199 static bool is_version_1(void *opaque, int version_id)
 200 {
 201     return version_id == 1;
 202 }
 203
 204 static const VMStateDescription vmstate_fw_cfg = {
 205     .name = "fw_cfg",
 206     .version_id = 2,
 207     .minimum_version_id = 1,
 208     .minimum_version_id_old = 1,
 209     .fields      = (VMStateField []) {
 210         VMSTATE_UINT16(cur_entry, FWCfgState),
 211         VMSTATE_UINT16_HACK(cur_offset, FWCfgState, is_version_1),
 212         VMSTATE_UINT32_V(cur_offset, FWCfgState, 2),
 213         VMSTATE_END_OF_LIST()
 214     }
 215 };
 216
 217 int fw_cfg_add_bytes(FWCfgState *s, uint16_t key, uint8_t *data, uint32_t len)
 218 {
 219     int arch = !!(key & FW_CFG_ARCH_LOCAL);
 220
 221     key &= FW_CFG_ENTRY_MASK;
 222
 223     if (key >= FW_CFG_MAX_ENTRY)
 224         return 0;
 225
 226     s->entries[arch][key].data = data;
 227     s->entries[arch][key].len = len;
 228
 229     return 1;
 230 }
 231
 232 int fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value)
 233 {
 234     uint16_t *copy;
 235
 236     copy = qemu_malloc(sizeof(value));
 237     *copy = cpu_to_le16(value);
 238     return fw_cfg_add_bytes(s, key, (uint8_t *)copy, sizeof(value));
 239 }
 240
 241 int fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value)
 242 {
 243     uint32_t *copy;
 244
 245     copy = qemu_malloc(sizeof(value));
 246     *copy = cpu_to_le32(value);
 247     return fw_cfg_add_bytes(s, key, (uint8_t *)copy, sizeof(value));
 248 }
 249
 250 int fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
 251 {
 252     uint64_t *copy;
 253
 254     copy = qemu_malloc(sizeof(value));
 255     *copy = cpu_to_le64(value);
 256     return fw_cfg_add_bytes(s, key, (uint8_t *)copy, sizeof(value));
 257 }
 258
 259 int fw_cfg_add_callback(FWCfgState *s, uint16_t key, FWCfgCallback callback,
 260                         void *callback_opaque, uint8_t *data, size_t len)
 261 {
 262     int arch = !!(key & FW_CFG_ARCH_LOCAL);
 263
 264     if (!(key & FW_CFG_WRITE_CHANNEL))
 265         return 0;
 266
 267     key &= FW_CFG_ENTRY_MASK;
 268
 269     if (key >= FW_CFG_MAX_ENTRY || len > 65535)
 270         return 0;
 271
 272     s->entries[arch][key].data = data;
 273     s->entries[arch][key].len = len;
 274     s->entries[arch][key].callback_opaque = callback_opaque;
 275     s->entries[arch][key].callback = callback;
 276
 277     return 1;
 278 }
 279
 280 int fw_cfg_add_file(FWCfgState *s,  const char *filename, uint8_t *data,
 281                     uint32_t len)
 282 {
 283     int i, index;
 284
 285     if (!s->files) {
 286         int dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
 287         s->files = qemu_mallocz(dsize);
 288         fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, (uint8_t*)s->files, dsize);
 289     }
 290
 291     index = be32_to_cpu(s->files->count);
 292     if (index == FW_CFG_FILE_SLOTS) {
 293         fprintf(stderr, "fw_cfg: out of file slots\n");
 294         return 0;
 295     }
 296
 297     fw_cfg_add_bytes(s, FW_CFG_FILE_FIRST + index, data, len);
 298
 299     pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
 300             filename);
 301     for (i = 0; i < index; i++) {
 302         if (strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
 303             FW_CFG_DPRINTF("%s: skip duplicate: %s\n", __FUNCTION__,
 304                            s->files->f[index].name);
 305             return 1;
 306         }
 307     }
 308
 309     s->files->f[index].size   = cpu_to_be32(len);
 310     s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
 311     FW_CFG_DPRINTF("%s: #%d: %s (%d bytes)\n", __FUNCTION__,
 312                    index, s->files->f[index].name, len);
 313
 314     s->files->count = cpu_to_be32(index+1);
 315     return 1;
 316 }
 317
 318 FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
 319                         target_phys_addr_t ctl_addr, target_phys_addr_t data_addr)
 320 {
 321     DeviceState *dev;
 322     SysBusDevice *d;
 323     FWCfgState *s;
 324
 325     dev = qdev_create(NULL, "fw_cfg");
 326     qdev_prop_set_uint32(dev, "ctl_iobase", ctl_port);
 327     qdev_prop_set_uint32(dev, "data_iobase", data_port);
 328     qdev_init_nofail(dev);
 329     d = sysbus_from_qdev(dev);
 330
 331     s = DO_UPCAST(FWCfgState, busdev.qdev, dev);
 332
 333     if (ctl_addr) {
 334         sysbus_mmio_map(d, 0, ctl_addr);
 335     }
 336     if (data_addr) {
 337         sysbus_mmio_map(d, 1, data_addr);
 338     }
 339     fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (uint8_t *)"QEMU", 4);
 340     fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
 341     fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)(display_type == DT_NOGRAPHIC));
 342     fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
 343     fw_cfg_add_i16(s, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
 344     fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
 345
 346     return s;
 347 }
 348
 349 static int fw_cfg_init1(SysBusDevice *dev)
 350 {
 351     FWCfgState *s = FROM_SYSBUS(FWCfgState, dev);
 352     int io_ctl_memory, io_data_memory;
 353
 354     io_ctl_memory = cpu_register_io_memory(fw_cfg_ctl_mem_read,
 355                                            fw_cfg_ctl_mem_write, s,
 356                                            DEVICE_NATIVE_ENDIAN);
 357     sysbus_init_mmio(dev, FW_CFG_SIZE, io_ctl_memory);
 358
 359     io_data_memory = cpu_register_io_memory(fw_cfg_data_mem_read,
 360                                             fw_cfg_data_mem_write, s,
 361                                             DEVICE_NATIVE_ENDIAN);
 362     sysbus_init_mmio(dev, FW_CFG_SIZE, io_data_memory);
 363
 364     if (s->ctl_iobase) {
 365         register_ioport_write(s->ctl_iobase, 2, 2, fw_cfg_io_writew, s);
 366     }
 367     if (s->data_iobase) {
 368         register_ioport_read(s->data_iobase, 1, 1, fw_cfg_io_readb, s);
 369         register_ioport_write(s->data_iobase, 1, 1, fw_cfg_io_writeb, s);
 370     }
 371     return 0;
 372 }
 373
 374 static SysBusDeviceInfo fw_cfg_info = {
 375     .init = fw_cfg_init1,
 376     .qdev.name = "fw_cfg",
 377     .qdev.size = sizeof(FWCfgState),
 378     .qdev.vmsd = &vmstate_fw_cfg,
 379     .qdev.reset = fw_cfg_reset,
 380     .qdev.no_user = 1,
 381     .qdev.props = (Property[]) {
 382         DEFINE_PROP_HEX32("ctl_iobase", FWCfgState, ctl_iobase, -1),
 383         DEFINE_PROP_HEX32("data_iobase", FWCfgState, data_iobase, -1),
 384         DEFINE_PROP_END_OF_LIST(),
 385     },
 386 };
 387
 388 static void fw_cfg_register_devices(void)
 389 {
 390     sysbus_register_withprop(&fw_cfg_info);
 391 }
 392
 393 device_init(fw_cfg_register_devices)