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