hw/loongarch: Init efi_fdt table

The efi_system_table adds a efi_fdt configuration table.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-Id: <20240426091551.2397867-9-gaosong@loongson.cn>

hw/loongarch/boot.c

@@ -113,6 +113,16 @@ static void init_efi_initrd_table(struct efi_system_table *systab,
     initrd_table->size = initrd_size;
 }
 
+static void init_efi_fdt_table(struct efi_system_table *systab)
+{
+    efi_guid_t tbl_guid = DEVICE_TREE_GUID;
+
+    /* efi_configuration_table 3 */
+    guidcpy(&systab->tables[2].guid, &tbl_guid);
+    systab->tables[2].table = (void *)FDT_BASE;
+    systab->nr_tables = 3;
+}
+
 static void init_systab(struct loongarch_boot_info *info, void *p, void *start)
 {
     void *bp_tables_start;
@@ -138,6 +148,7 @@ static void init_systab(struct loongarch_boot_info *info, void *p, void *start)
                   sizeof(efi_memory_desc_t) * memmap_entries, 64 * KiB);
     init_efi_initrd_table(systab, p, start);
     p += ROUND_UP(sizeof(struct efi_initrd), 64 * KiB);
+    init_efi_fdt_table(systab);
 
     systab->tables = (struct efi_configuration_table *)(bp_tables_start - start);
 }

hw/loongarch/virt.c

@@ -727,7 +727,6 @@ static void loongarch_init(MachineState *machine)
     int nb_numa_nodes = machine->numa_state->num_nodes;
     NodeInfo *numa_info = machine->numa_state->nodes;
     int i;
-    hwaddr fdt_base;
     const CPUArchIdList *possible_cpus;
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     CPUState *cpu;
@@ -857,12 +856,11 @@ static void loongarch_init(MachineState *machine)
      * Put the FDT into the memory map as a ROM image: this will ensure
      * the FDT is copied again upon reset, even if addr points into RAM.
      */
-    fdt_base = 1 * MiB;
     qemu_fdt_dumpdtb(machine->fdt, lams->fdt_size);
-    rom_add_blob_fixed_as("fdt", machine->fdt, lams->fdt_size, fdt_base,
+    rom_add_blob_fixed_as("fdt", machine->fdt, lams->fdt_size, FDT_BASE,
                           &address_space_memory);
     qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds,
-            rom_ptr_for_as(&address_space_memory, fdt_base, lams->fdt_size));
+            rom_ptr_for_as(&address_space_memory, FDT_BASE, lams->fdt_size));
 
     lams->bootinfo.ram_size = ram_size;
     loongarch_load_kernel(machine, &lams->bootinfo);

include/hw/loongarch/boot.h

@@ -34,6 +34,10 @@ typedef struct {
         EFI_GUID(0x5568e427, 0x68fc, 0x4f3d,  0xac, 0x74, \
                  0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
 
+#define DEVICE_TREE_GUID \
+        EFI_GUID(0xb1b621d5, 0xf19c, 0x41a5,  0x83, 0x0b, \
+                 0xd9, 0x15, 0x2c, 0x69, 0xaa, 0xe0)
+
 struct efi_config_table {
     efi_guid_t guid;
     uint64_t *ptr;

include/hw/loongarch/virt.h

@@ -35,6 +35,8 @@
 
 #define COMMAND_LINE_SIZE       512
 
+#define FDT_BASE                0x100000
+
 extern struct memmap_entry *memmap_table;
 extern unsigned memmap_entries;