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 "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "sysemu/sysemu.h"
  28 #include "qapi/visitor.h"
  29 #include "qemu/error-report.h"
  30 #include "hw/hw.h"
  31 #include "hw/qdev-core.h"
  32
  33 typedef struct FWBootEntry FWBootEntry;
  34
  35 struct FWBootEntry {
  36     QTAILQ_ENTRY(FWBootEntry) link;
  37     int32_t bootindex;
  38     DeviceState *dev;
  39     char *suffix;
  40 };
  41
  42 static QTAILQ_HEAD(, FWBootEntry) fw_boot_order =
  43     QTAILQ_HEAD_INITIALIZER(fw_boot_order);
  44 static QEMUBootSetHandler *boot_set_handler;
  45 static void *boot_set_opaque;
  46
  47 void qemu_register_boot_set(QEMUBootSetHandler *func, void *opaque)
  48 {
  49     boot_set_handler = func;
  50     boot_set_opaque = opaque;
  51 }
  52
  53 void qemu_boot_set(const char *boot_order, Error **errp)
  54 {
  55     Error *local_err = NULL;
  56
  57     if (!boot_set_handler) {
  58         error_setg(errp, "no function defined to set boot device list for"
  59                          " this architecture");
  60         return;
  61     }
  62
  63     validate_bootdevices(boot_order, &local_err);
  64     if (local_err) {
  65         error_propagate(errp, local_err);
  66         return;
  67     }
  68
  69     boot_set_handler(boot_set_opaque, boot_order, errp);
  70 }
  71
  72 void validate_bootdevices(const char *devices, Error **errp)
  73 {
  74     /* We just do some generic consistency checks */
  75     const char *p;
  76     int bitmap = 0;
  77
  78     for (p = devices; *p != '\0'; p++) {
  79         /* Allowed boot devices are:
  80          * a-b: floppy disk drives
  81          * c-f: IDE disk drives
  82          * g-m: machine implementation dependent drives
  83          * n-p: network devices
  84          * It's up to each machine implementation to check if the given boot
  85          * devices match the actual hardware implementation and firmware
  86          * features.
  87          */
  88         if (*p < 'a' || *p > 'p') {
  89             error_setg(errp, "Invalid boot device '%c'", *p);
  90             return;
  91         }
  92         if (bitmap & (1 << (*p - 'a'))) {
  93             error_setg(errp, "Boot device '%c' was given twice", *p);
  94             return;
  95         }
  96         bitmap |= 1 << (*p - 'a');
  97     }
  98 }
  99
 100 void restore_boot_order(void *opaque)
 101 {
 102     char *normal_boot_order = opaque;
 103     static int first = 1;
 104
 105     /* Restore boot order and remove ourselves after the first boot */
 106     if (first) {
 107         first = 0;
 108         return;
 109     }
 110
 111     if (boot_set_handler) {
 112         qemu_boot_set(normal_boot_order, &error_abort);
 113     }
 114
 115     qemu_unregister_reset(restore_boot_order, normal_boot_order);
 116     g_free(normal_boot_order);
 117 }
 118
 119 void check_boot_index(int32_t bootindex, Error **errp)
 120 {
 121     FWBootEntry *i;
 122
 123     if (bootindex >= 0) {
 124         QTAILQ_FOREACH(i, &fw_boot_order, link) {
 125             if (i->bootindex == bootindex) {
 126                 error_setg(errp, "The bootindex %d has already been used",
 127                            bootindex);
 128                 return;
 129             }
 130         }
 131     }
 132 }
 133
 134 void del_boot_device_path(DeviceState *dev, const char *suffix)
 135 {
 136     FWBootEntry *i;
 137
 138     if (dev == NULL) {
 139         return;
 140     }
 141
 142     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 143         if ((!suffix || !g_strcmp0(i->suffix, suffix)) &&
 144              i->dev == dev) {
 145             QTAILQ_REMOVE(&fw_boot_order, i, link);
 146             g_free(i->suffix);
 147             g_free(i);
 148
 149             break;
 150         }
 151     }
 152 }
 153
 154 void add_boot_device_path(int32_t bootindex, DeviceState *dev,
 155                           const char *suffix)
 156 {
 157     FWBootEntry *node, *i;
 158
 159     if (bootindex < 0) {
 160         del_boot_device_path(dev, suffix);
 161         return;
 162     }
 163
 164     assert(dev != NULL || suffix != NULL);
 165
 166     del_boot_device_path(dev, suffix);
 167
 168     node = g_malloc0(sizeof(FWBootEntry));
 169     node->bootindex = bootindex;
 170     node->suffix = g_strdup(suffix);
 171     node->dev = dev;
 172
 173     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 174         if (i->bootindex == bootindex) {
 175             error_report("Two devices with same boot index %d", bootindex);
 176             exit(1);
 177         } else if (i->bootindex < bootindex) {
 178             continue;
 179         }
 180         QTAILQ_INSERT_BEFORE(i, node, link);
 181         return;
 182     }
 183     QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
 184 }
 185
 186 DeviceState *get_boot_device(uint32_t position)
 187 {
 188     uint32_t counter = 0;
 189     FWBootEntry *i = NULL;
 190     DeviceState *res = NULL;
 191
 192     if (!QTAILQ_EMPTY(&fw_boot_order)) {
 193         QTAILQ_FOREACH(i, &fw_boot_order, link) {
 194             if (counter == position) {
 195                 res = i->dev;
 196                 break;
 197             }
 198             counter++;
 199         }
 200     }
 201     return res;
 202 }
 203
 204 /*
 205  * This function returns null terminated string that consist of new line
 206  * separated device paths.
 207  *
 208  * memory pointed by "size" is assigned total length of the array in bytes
 209  *
 210  */
 211 char *get_boot_devices_list(size_t *size, bool ignore_suffixes)
 212 {
 213     FWBootEntry *i;
 214     size_t total = 0;
 215     char *list = NULL;
 216
 217     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 218         char *devpath = NULL,  *suffix = NULL;
 219         char *bootpath;
 220         char *d;
 221         size_t len;
 222
 223         if (i->dev) {
 224             devpath = qdev_get_fw_dev_path(i->dev);
 225             assert(devpath);
 226         }
 227
 228         if (!ignore_suffixes) {
 229             if (i->dev) {
 230                 d = qdev_get_own_fw_dev_path_from_handler(i->dev->parent_bus,
 231                                                           i->dev);
 232                 if (d) {
 233                     assert(!i->suffix);
 234                     suffix = d;
 235                 } else {
 236                     suffix = g_strdup(i->suffix);
 237                 }
 238             } else {
 239                 suffix = g_strdup(i->suffix);
 240             }
 241         }
 242
 243         bootpath = g_strdup_printf("%s%s",
 244                                    devpath ? devpath : "",
 245                                    suffix ? suffix : "");
 246         g_free(devpath);
 247         g_free(suffix);
 248
 249         if (total) {
 250             list[total-1] = '\n';
 251         }
 252         len = strlen(bootpath) + 1;
 253         list = g_realloc(list, total + len);
 254         memcpy(&list[total], bootpath, len);
 255         total += len;
 256         g_free(bootpath);
 257     }
 258
 259     *size = total;
 260
 261     if (boot_strict && *size > 0) {
 262         list[total-1] = '\n';
 263         list = g_realloc(list, total + 5);
 264         memcpy(&list[total], "HALT", 5);
 265         *size = total + 5;
 266     }
 267     return list;
 268 }
 269
 270 typedef struct {
 271     int32_t *bootindex;
 272     const char *suffix;
 273     DeviceState *dev;
 274 } BootIndexProperty;
 275
 276 static void device_get_bootindex(Object *obj, Visitor *v, const char *name,
 277                                  void *opaque, Error **errp)
 278 {
 279     BootIndexProperty *prop = opaque;
 280     visit_type_int32(v, name, prop->bootindex, errp);
 281 }
 282
 283 static void device_set_bootindex(Object *obj, Visitor *v, const char *name,
 284                                  void *opaque, Error **errp)
 285 {
 286     BootIndexProperty *prop = opaque;
 287     int32_t boot_index;
 288     Error *local_err = NULL;
 289
 290     visit_type_int32(v, name, &boot_index, &local_err);
 291     if (local_err) {
 292         goto out;
 293     }
 294     /* check whether bootindex is present in fw_boot_order list  */
 295     check_boot_index(boot_index, &local_err);
 296     if (local_err) {
 297         goto out;
 298     }
 299     /* change bootindex to a new one */
 300     *prop->bootindex = boot_index;
 301
 302     add_boot_device_path(*prop->bootindex, prop->dev, prop->suffix);
 303
 304 out:
 305     if (local_err) {
 306         error_propagate(errp, local_err);
 307     }
 308 }
 309
 310 static void property_release_bootindex(Object *obj, const char *name,
 311                                        void *opaque)
 312
 313 {
 314     BootIndexProperty *prop = opaque;
 315
 316     del_boot_device_path(prop->dev, prop->suffix);
 317     g_free(prop);
 318 }
 319
 320 void device_add_bootindex_property(Object *obj, int32_t *bootindex,
 321                                    const char *name, const char *suffix,
 322                                    DeviceState *dev, Error **errp)
 323 {
 324     Error *local_err = NULL;
 325     BootIndexProperty *prop = g_malloc0(sizeof(*prop));
 326
 327     prop->bootindex = bootindex;
 328     prop->suffix = suffix;
 329     prop->dev = dev;
 330
 331     object_property_add(obj, name, "int32",
 332                         device_get_bootindex,
 333                         device_set_bootindex,
 334                         property_release_bootindex,
 335                         prop, &local_err);
 336
 337     if (local_err) {
 338         error_propagate(errp, local_err);
 339         g_free(prop);
 340         return;
 341     }
 342     /* initialize devices' bootindex property to -1 */
 343     object_property_set_int(obj, -1, name, NULL);
 344 }