bootdevice.c

   1 /*
   2  * QEMU Boot Device Implement
   3  *
   4  * Copyright (c) 2014 HUAWEI TECHNOLOGIES CO., LTD.
   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 #include "sysemu/sysemu.h"
  26 #include "qapi/visitor.h"
  27 #include "qemu/error-report.h"
  28 #include "hw/hw.h"
  29
  30 typedef struct FWBootEntry FWBootEntry;
  31
  32 struct FWBootEntry {
  33     QTAILQ_ENTRY(FWBootEntry) link;
  34     int32_t bootindex;
  35     DeviceState *dev;
  36     char *suffix;
  37 };
  38
  39 static QTAILQ_HEAD(, FWBootEntry) fw_boot_order =
  40     QTAILQ_HEAD_INITIALIZER(fw_boot_order);
  41 static QEMUBootSetHandler *boot_set_handler;
  42 static void *boot_set_opaque;
  43
  44 void qemu_register_boot_set(QEMUBootSetHandler *func, void *opaque)
  45 {
  46     boot_set_handler = func;
  47     boot_set_opaque = opaque;
  48 }
  49
  50 void qemu_boot_set(const char *boot_order, Error **errp)
  51 {
  52     Error *local_err = NULL;
  53
  54     if (!boot_set_handler) {
  55         error_setg(errp, "no function defined to set boot device list for"
  56                          " this architecture");
  57         return;
  58     }
  59
  60     validate_bootdevices(boot_order, &local_err);
  61     if (local_err) {
  62         error_propagate(errp, local_err);
  63         return;
  64     }
  65
  66     boot_set_handler(boot_set_opaque, boot_order, errp);
  67 }
  68
  69 void validate_bootdevices(const char *devices, Error **errp)
  70 {
  71     /* We just do some generic consistency checks */
  72     const char *p;
  73     int bitmap = 0;
  74
  75     for (p = devices; *p != '\0'; p++) {
  76         /* Allowed boot devices are:
  77          * a-b: floppy disk drives
  78          * c-f: IDE disk drives
  79          * g-m: machine implementation dependent drives
  80          * n-p: network devices
  81          * It's up to each machine implementation to check if the given boot
  82          * devices match the actual hardware implementation and firmware
  83          * features.
  84          */
  85         if (*p < 'a' || *p > 'p') {
  86             error_setg(errp, "Invalid boot device '%c'", *p);
  87             return;
  88         }
  89         if (bitmap & (1 << (*p - 'a'))) {
  90             error_setg(errp, "Boot device '%c' was given twice", *p);
  91             return;
  92         }
  93         bitmap |= 1 << (*p - 'a');
  94     }
  95 }
  96
  97 void restore_boot_order(void *opaque)
  98 {
  99     char *normal_boot_order = opaque;
 100     static int first = 1;
 101
 102     /* Restore boot order and remove ourselves after the first boot */
 103     if (first) {
 104         first = 0;
 105         return;
 106     }
 107
 108     if (boot_set_handler) {
 109         qemu_boot_set(normal_boot_order, &error_abort);
 110     }
 111
 112     qemu_unregister_reset(restore_boot_order, normal_boot_order);
 113     g_free(normal_boot_order);
 114 }
 115
 116 void check_boot_index(int32_t bootindex, Error **errp)
 117 {
 118     FWBootEntry *i;
 119
 120     if (bootindex >= 0) {
 121         QTAILQ_FOREACH(i, &fw_boot_order, link) {
 122             if (i->bootindex == bootindex) {
 123                 error_setg(errp, "The bootindex %d has already been used",
 124                            bootindex);
 125                 return;
 126             }
 127         }
 128     }
 129 }
 130
 131 void del_boot_device_path(DeviceState *dev, const char *suffix)
 132 {
 133     FWBootEntry *i;
 134
 135     if (dev == NULL) {
 136         return;
 137     }
 138
 139     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 140         if ((!suffix || !g_strcmp0(i->suffix, suffix)) &&
 141              i->dev == dev) {
 142             QTAILQ_REMOVE(&fw_boot_order, i, link);
 143             g_free(i->suffix);
 144             g_free(i);
 145
 146             break;
 147         }
 148     }
 149 }
 150
 151 void add_boot_device_path(int32_t bootindex, DeviceState *dev,
 152                           const char *suffix)
 153 {
 154     FWBootEntry *node, *i;
 155
 156     if (bootindex < 0) {
 157         del_boot_device_path(dev, suffix);
 158         return;
 159     }
 160
 161     assert(dev != NULL || suffix != NULL);
 162
 163     del_boot_device_path(dev, suffix);
 164
 165     node = g_malloc0(sizeof(FWBootEntry));
 166     node->bootindex = bootindex;
 167     node->suffix = g_strdup(suffix);
 168     node->dev = dev;
 169
 170     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 171         if (i->bootindex == bootindex) {
 172             error_report("Two devices with same boot index %d", bootindex);
 173             exit(1);
 174         } else if (i->bootindex < bootindex) {
 175             continue;
 176         }
 177         QTAILQ_INSERT_BEFORE(i, node, link);
 178         return;
 179     }
 180     QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
 181 }
 182
 183 DeviceState *get_boot_device(uint32_t position)
 184 {
 185     uint32_t counter = 0;
 186     FWBootEntry *i = NULL;
 187     DeviceState *res = NULL;
 188
 189     if (!QTAILQ_EMPTY(&fw_boot_order)) {
 190         QTAILQ_FOREACH(i, &fw_boot_order, link) {
 191             if (counter == position) {
 192                 res = i->dev;
 193                 break;
 194             }
 195             counter++;
 196         }
 197     }
 198     return res;
 199 }
 200
 201 /*
 202  * This function returns null terminated string that consist of new line
 203  * separated device paths.
 204  *
 205  * memory pointed by "size" is assigned total length of the array in bytes
 206  *
 207  */
 208 char *get_boot_devices_list(size_t *size, bool ignore_suffixes)
 209 {
 210     FWBootEntry *i;
 211     size_t total = 0;
 212     char *list = NULL;
 213
 214     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 215         char *devpath = NULL,  *suffix = NULL;
 216         char *bootpath;
 217         char *d;
 218         size_t len;
 219
 220         if (i->dev) {
 221             devpath = qdev_get_fw_dev_path(i->dev);
 222             assert(devpath);
 223         }
 224
 225         if (!ignore_suffixes) {
 226             if (i->dev) {
 227                 d = qdev_get_own_fw_dev_path_from_handler(i->dev->parent_bus,
 228                                                           i->dev);
 229                 if (d) {
 230                     assert(!i->suffix);
 231                     suffix = d;
 232                 } else {
 233                     suffix = g_strdup(i->suffix);
 234                 }
 235             } else {
 236                 suffix = g_strdup(i->suffix);
 237             }
 238         }
 239
 240         bootpath = g_strdup_printf("%s%s",
 241                                    devpath ? devpath : "",
 242                                    suffix ? suffix : "");
 243         g_free(devpath);
 244         g_free(suffix);
 245
 246         if (total) {
 247             list[total-1] = '\n';
 248         }
 249         len = strlen(bootpath) + 1;
 250         list = g_realloc(list, total + len);
 251         memcpy(&list[total], bootpath, len);
 252         total += len;
 253         g_free(bootpath);
 254     }
 255
 256     *size = total;
 257
 258     if (boot_strict && *size > 0) {
 259         list[total-1] = '\n';
 260         list = g_realloc(list, total + 5);
 261         memcpy(&list[total], "HALT", 5);
 262         *size = total + 5;
 263     }
 264     return list;
 265 }
 266
 267 typedef struct {
 268     int32_t *bootindex;
 269     const char *suffix;
 270     DeviceState *dev;
 271 } BootIndexProperty;
 272
 273 static void device_get_bootindex(Object *obj, Visitor *v, void *opaque,
 274                                  const char *name, Error **errp)
 275 {
 276     BootIndexProperty *prop = opaque;
 277     visit_type_int32(v, prop->bootindex, name, errp);
 278 }
 279
 280 static void device_set_bootindex(Object *obj, Visitor *v, void *opaque,
 281                                  const char *name, Error **errp)
 282 {
 283     BootIndexProperty *prop = opaque;
 284     int32_t boot_index;
 285     Error *local_err = NULL;
 286
 287     visit_type_int32(v, &boot_index, name, &local_err);
 288     if (local_err) {
 289         goto out;
 290     }
 291     /* check whether bootindex is present in fw_boot_order list  */
 292     check_boot_index(boot_index, &local_err);
 293     if (local_err) {
 294         goto out;
 295     }
 296     /* change bootindex to a new one */
 297     *prop->bootindex = boot_index;
 298
 299     add_boot_device_path(*prop->bootindex, prop->dev, prop->suffix);
 300
 301 out:
 302     if (local_err) {
 303         error_propagate(errp, local_err);
 304     }
 305 }
 306
 307 static void property_release_bootindex(Object *obj, const char *name,
 308                                        void *opaque)
 309
 310 {
 311     BootIndexProperty *prop = opaque;
 312
 313     del_boot_device_path(prop->dev, prop->suffix);
 314     g_free(prop);
 315 }
 316
 317 void device_add_bootindex_property(Object *obj, int32_t *bootindex,
 318                                    const char *name, const char *suffix,
 319                                    DeviceState *dev, Error **errp)
 320 {
 321     Error *local_err = NULL;
 322     BootIndexProperty *prop = g_malloc0(sizeof(*prop));
 323
 324     prop->bootindex = bootindex;
 325     prop->suffix = suffix;
 326     prop->dev = dev;
 327
 328     object_property_add(obj, name, "int32",
 329                         device_get_bootindex,
 330                         device_set_bootindex,
 331                         property_release_bootindex,
 332                         prop, &local_err);
 333
 334     if (local_err) {
 335         error_propagate(errp, local_err);
 336         g_free(prop);
 337         return;
 338     }
 339     /* initialize devices' bootindex property to -1 */
 340     object_property_set_int(obj, -1, name, NULL);
 341 }