[PATCHv5,15/15] Pass boot device list to firmware.

diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
index 7b9434f..4eea338 100644
--- a/hw/fw_cfg.c
+++ b/hw/fw_cfg.c
@@ -53,6 +53,7 @@  struct FWCfgState {
     FWCfgFiles *files;
     uint16_t cur_entry;
     uint32_t cur_offset;
+    Notifier machine_ready;
 };
 
 static void fw_cfg_write(FWCfgState *s, uint8_t value)
@@ -315,6 +316,16 @@  int fw_cfg_add_file(FWCfgState *s,  const char *filename, uint8_t *data,
     return 1;
 }
 
+static void fw_cfg_machine_ready(struct Notifier* n)
+{
+    uint32_t len;
+    FWCfgState *s = container_of(n, FWCfgState, machine_ready);
+    char *bootindex = get_boot_devices_list(&len);
+
+    fw_cfg_add_i32(s, FW_CFG_BOOTINDEX_LEN, len);
+    fw_cfg_add_bytes(s, FW_CFG_BOOTINDEX_DATA, (uint8_t*)bootindex, len);
+}
+
 FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
                         target_phys_addr_t ctl_addr, target_phys_addr_t data_addr)
 {
@@ -343,6 +354,10 @@  FWCfgState *fw_cfg_init(uint32_t ctl_port, uint32_t data_port,
     fw_cfg_add_i16(s, FW_CFG_MAX_CPUS, (uint16_t)max_cpus);
     fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
 
+
+    s->machine_ready.notify = fw_cfg_machine_ready;
+    qemu_add_machine_init_done_notifier(&s->machine_ready);
+
     return s;
 }
 
diff --git a/hw/fw_cfg.h b/hw/fw_cfg.h
index 856bf91..b951f6b 100644
--- a/hw/fw_cfg.h
+++ b/hw/fw_cfg.h
@@ -30,7 +30,10 @@ 
 
 #define FW_CFG_FILE_FIRST       0x20
 #define FW_CFG_FILE_SLOTS       0x10
-#define FW_CFG_MAX_ENTRY        (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
+#define FW_CFG_FILE_LAST_SLOT   (FW_CFG_FILE_FIRST+FW_CFG_FILE_SLOTS)
+#define FW_CFG_BOOTINDEX_LEN    (FW_CFG_FILE_LAST_SLOT + 1)
+#define FW_CFG_BOOTINDEX_DATA   (FW_CFG_FILE_LAST_SLOT + 2)
+#define FW_CFG_MAX_ENTRY        FW_CFG_BOOTINDEX_DATA + 1 
 
 #define FW_CFG_WRITE_CHANNEL    0x4000
 #define FW_CFG_ARCH_LOCAL       0x8000
diff --git a/sysemu.h b/sysemu.h
index c42f33a..38a20a3 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -196,4 +196,5 @@  void register_devices(void);
 
 void add_boot_device_path(int32_t bootindex, DeviceState *dev,
                           const char *suffix);
+char *get_boot_devices_list(uint32_t *size);
 #endif
diff --git a/vl.c b/vl.c
index 918d988..ab36f9f 100644
--- a/vl.c
+++ b/vl.c
@@ -735,6 +735,55 @@  void add_boot_device_path(int32_t bootindex, DeviceState *dev,
     QTAILQ_INSERT_TAIL(&fw_boot_order, node, link);
 }
 
+/*
+ * This function returns device list as an array in a below format:
+ * +-----------+-------------+-----------------
+ * | devpath1  |  devpath2   |     ...
+ * +-----------+-------------+-----------------
+ * where:
+ *   devpath - null terminated string representing one device path
+ *
+ *  memory pointed by "size" is assigned total length of teh array in bytes
+ *
+ */
+char *get_boot_devices_list(uint32_t *size)
+{
+    FWBootEntry *i;
+    uint32_t total = 0;
+    char *list = NULL;
+
+    QTAILQ_FOREACH(i, &fw_boot_order, link) {
+        char *devpath = NULL, *bootpath;
+        int len;
+
+        if (i->dev) {
+            devpath = qdev_get_fw_dev_path(i->dev);
+            assert(devpath);
+        }
+
+        if (i->suffix && devpath) {
+            bootpath = qemu_malloc(strlen(devpath) + strlen(i->suffix) + 2);
+            sprintf(bootpath, "%s/%s", devpath, i->suffix);
+            qemu_free(devpath);
+        } else if (devpath) {
+            bootpath = devpath;
+        } else {
+            bootpath = strdup(i->suffix);
+            assert(bootpath);
+        }
+
+        len = strlen(bootpath) + 1;
+        list = qemu_realloc(list, total + len);
+        memcpy(&list[total], bootpath, len);
+        total += len;
+        qemu_free(bootpath);
+    }
+
+    *size = total;
+
+    return list;
+}
+
 static void numa_add(const char *optarg)
 {
     char option[128];