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
  27 typedef struct FWBootEntry FWBootEntry;
  28
  29 struct FWBootEntry {
  30     QTAILQ_ENTRY(FWBootEntry) link;
  31     int32_t bootindex;
  32     DeviceState *dev;
  33     char *suffix;
  34 };
  35
  36 static QTAILQ_HEAD(, FWBootEntry) fw_boot_order =
  37     QTAILQ_HEAD_INITIALIZER(fw_boot_order);
  38
  39 void check_boot_index(int32_t bootindex, Error **errp)
  40 {
  41     FWBootEntry *i;
  42
  43     if (bootindex >= 0) {
  44         QTAILQ_FOREACH(i, &fw_boot_order, link) {
  45             if (i->bootindex == bootindex) {
  46                 error_setg(errp, "The bootindex %d has already been used",
  47                            bootindex);
  48                 return;
  49             }
  50         }
  51     }
  52 }
  53
  54 void add_boot_device_path(int32_t bootindex, DeviceState *dev,
  55                           const char *suffix)
  56 {
  57     FWBootEntry *node, *i;
  58
  59     if (bootindex < 0) {
  60         return;
  61     }
  62
  63     assert(dev != NULL || suffix != NULL);
  64
  65     node = g_malloc0(sizeof(FWBootEntry));
  66     node->bootindex = bootindex;
  67     node->suffix = g_strdup(suffix);
  68     node->dev = dev;
  69
  70     QTAILQ_FOREACH(i, &fw_boot_order, link) {
  71         if (i->bootindex == bootindex) {
  72             fprintf(stderr, "Two devices with same boot index %d\n", bootindex);
  73             exit(1);
  74         } else if (i->bootindex < bootindex) {
  75             continue;
  76         }
  77         QTAILQ_INSERT_BEFORE(i, node, link);
  78         return;
  79     }
  80     QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
  81 }
  82
  83 DeviceState *get_boot_device(uint32_t position)
  84 {
  85     uint32_t counter = 0;
  86     FWBootEntry *i = NULL;
  87     DeviceState *res = NULL;
  88
  89     if (!QTAILQ_EMPTY(&fw_boot_order)) {
  90         QTAILQ_FOREACH(i, &fw_boot_order, link) {
  91             if (counter == position) {
  92                 res = i->dev;
  93                 break;
  94             }
  95             counter++;
  96         }
  97     }
  98     return res;
  99 }
 100
 101 /*
 102  * This function returns null terminated string that consist of new line
 103  * separated device paths.
 104  *
 105  * memory pointed by "size" is assigned total length of the array in bytes
 106  *
 107  */
 108 char *get_boot_devices_list(size_t *size, bool ignore_suffixes)
 109 {
 110     FWBootEntry *i;
 111     size_t total = 0;
 112     char *list = NULL;
 113
 114     QTAILQ_FOREACH(i, &fw_boot_order, link) {
 115         char *devpath = NULL, *bootpath;
 116         size_t len;
 117
 118         if (i->dev) {
 119             devpath = qdev_get_fw_dev_path(i->dev);
 120             assert(devpath);
 121         }
 122
 123         if (i->suffix && !ignore_suffixes && devpath) {
 124             size_t bootpathlen = strlen(devpath) + strlen(i->suffix) + 1;
 125
 126             bootpath = g_malloc(bootpathlen);
 127             snprintf(bootpath, bootpathlen, "%s%s", devpath, i->suffix);
 128             g_free(devpath);
 129         } else if (devpath) {
 130             bootpath = devpath;
 131         } else if (!ignore_suffixes) {
 132             assert(i->suffix);
 133             bootpath = g_strdup(i->suffix);
 134         } else {
 135             bootpath = g_strdup("");
 136         }
 137
 138         if (total) {
 139             list[total-1] = '\n';
 140         }
 141         len = strlen(bootpath) + 1;
 142         list = g_realloc(list, total + len);
 143         memcpy(&list[total], bootpath, len);
 144         total += len;
 145         g_free(bootpath);
 146     }
 147
 148     *size = total;
 149
 150     if (boot_strict && *size > 0) {
 151         list[total-1] = '\n';
 152         list = g_realloc(list, total + 5);
 153         memcpy(&list[total], "HALT", 5);
 154         *size = total + 5;
 155     }
 156     return list;
 157 }