[PATCH 2/6] hw/loongarch: Add uefi bios loading support

[Xiaojuan Yang]

Add uefi bios loading support, now only uefi bios is porting to
loongarch virt machine.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
---
 hw/loongarch/loongson3.c    | 34 ++++++++++++++++++++++++++++++++++
 include/hw/loongarch/virt.h |  4 ++++
 2 files changed, 38 insertions(+)

diff --git a/hw/loongarch/loongson3.c b/hw/loongarch/loongson3.c
index 9aa580075e..e1056d3e0f 100644
--- a/hw/loongarch/loongson3.c
+++ b/hw/loongarch/loongson3.c
@@ -316,6 +316,37 @@ static void loongarch_irq_init(LoongArchMachineState *lams)
     loongarch_devices_init(pch_pic);
 }
 
+static void loongarch_firmware_init(LoongArchMachineState *lams)
+{
+    char *filename = MACHINE(lams)->firmware;
+    char *bios_name = NULL;
+    int bios_size;
+
+    lams->bios_loaded = false;
+    if (filename) {
+        bios_name = qemu_find_file(QEMU_FILE_TYPE_BIOS, filename);
+        if (!bios_name) {
+            error_report("Could not find ROM image '%s'", filename);
+            exit(1);
+        }
+
+        bios_size = load_image_targphys(bios_name, VIRT_BIOS_BASE, 
VIRT_BIOS_SIZE);
+        if (bios_size < 0) {
+            error_report("Could not load ROM image '%s'", bios_name);
+            exit(1);
+        }
+
+        g_free(bios_name);
+
+        memory_region_init_ram(&lams->bios, NULL, "loongarch.bios",
+                               VIRT_BIOS_SIZE, &error_fatal);
+        memory_region_set_readonly(&lams->bios, true);
+        memory_region_add_subregion(get_system_memory(), VIRT_BIOS_BASE, 
&lams->bios);
+        lams->bios_loaded = true;
+    }
+
+}
+
 static void reset_load_elf(void *opaque)
 {
     LoongArchCPU *cpu = opaque;
@@ -375,6 +406,9 @@ static void loongarch_init(MachineState *machine)
                              get_system_io(), 0, LOONGARCH_ISA_IO_SIZE);
     memory_region_add_subregion(address_space_mem, LOONGARCH_ISA_IO_BASE,
                                 &lams->isa_io);
+    /* load the BIOS image. */
+    loongarch_firmware_init(lams);
+
     /* fw_cfg init */
     lams->fw_cfg = loongarch_fw_cfg_init(ram_size, machine);
     rom_set_fw(lams->fw_cfg);
diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index 9fec1f8a5c..ec37d86e44 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -18,6 +18,8 @@
 #define LOONGARCH_ISA_IO_BASE   0x18000000UL
 #define LOONGARCH_ISA_IO_SIZE   0x0004000
 #define VIRT_FWCFG_BASE         0x1e020000UL
+#define VIRT_BIOS_BASE          0x1c000000UL
+#define VIRT_BIOS_SIZE          (4 * MiB)
 
 struct LoongArchMachineState {
     /*< private >*/
@@ -27,6 +29,8 @@ struct LoongArchMachineState {
     MemoryRegion lowmem;
     MemoryRegion highmem;
     MemoryRegion isa_io;
+    MemoryRegion bios;
+    bool         bios_loaded;
     /* State for other subsystems/APIs: */
     FWCfgState  *fw_cfg;
 };
-- 
2.31.1