2 files changed, 77 insertions, 0 deletions

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 5b969cd..bef451b 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -10,6 +10,7 @@
 #include "config.h"
 #include "hw/hw.h"
 #include "hw/arm/arm.h"
+#include "hw/arm/linux-boot-if.h"
 #include "sysemu/sysemu.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
@@ -555,6 +556,20 @@ static void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_t size_key,
     fw_cfg_add_bytes(fw_cfg, data_key, data, size);
 }
 
+static int do_arm_linux_init(Object *obj, void *opaque)
+{
+    if (object_dynamic_cast(obj, TYPE_ARM_LINUX_BOOT_IF)) {
+        ARMLinuxBootIf *albif = ARM_LINUX_BOOT_IF(obj);
+        ARMLinuxBootIfClass *albifc = ARM_LINUX_BOOT_IF_GET_CLASS(obj);
+        struct arm_boot_info *info = opaque;
+
+        if (albifc->arm_linux_init) {
+            albifc->arm_linux_init(albif, info->secure_boot);
+        }
+    }
+    return 0;
+}
+
 static void arm_load_kernel_notify(Notifier *notifier, void *data)
 {
     CPUState *cs;
@@ -778,6 +793,12 @@ static void arm_load_kernel_notify(Notifier *notifier, void *data)
         if (info->nb_cpus > 1) {
             info->write_secondary_boot(cpu, info);
         }
+
+        /* Notify devices which need to fake up firmware initialization
+         * that we're doing a direct kernel boot.
+         */
+        object_child_foreach_recursive(object_get_root(),
+                                       do_arm_linux_init, info);
     }
     info->is_linux = is_linux;
 
@@ -803,3 +824,16 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
         qemu_register_reset(do_cpu_reset, ARM_CPU(cs));
     }
 }
+
+static const TypeInfo arm_linux_boot_if_info = {
+    .name = TYPE_ARM_LINUX_BOOT_IF,
+    .parent = TYPE_INTERFACE,
+    .class_size = sizeof(ARMLinuxBootIfClass),
+};
+
+static void arm_linux_boot_register_types(void)
+{
+    type_register_static(&arm_linux_boot_if_info);
+}
+
+type_init(arm_linux_boot_register_types)
diff --git a/include/hw/arm/linux-boot-if.h b/include/hw/arm/linux-boot-if.h
new file mode 100644
index 0000000..aba4479
--- /dev/null
+++ b/include/hw/arm/linux-boot-if.h
@@ -0,0 +1,43 @@
+/*
+ * hw/arm/linux-boot-if.h : interface for devices which need to behave
+ * specially for direct boot of an ARM Linux kernel
+ */
+
+#ifndef HW_ARM_LINUX_BOOT_IF_H
+#define HW_ARM_LINUX_BOOT_IF_H
+
+#include "qom/object.h"
+
+#define TYPE_ARM_LINUX_BOOT_IF "arm-linux-boot-if"
+#define ARM_LINUX_BOOT_IF_CLASS(klass) \
+    OBJECT_CLASS_CHECK(ARMLinuxBootIfClass, (klass), TYPE_ARM_LINUX_BOOT_IF)
+#define ARM_LINUX_BOOT_IF_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(ARMLinuxBootIfClass, (obj), TYPE_ARM_LINUX_BOOT_IF)
+#define ARM_LINUX_BOOT_IF(obj) \
+    INTERFACE_CHECK(ARMLinuxBootIf, (obj), TYPE_ARM_LINUX_BOOT_IF)
+
+typedef struct ARMLinuxBootIf {
+    /*< private >*/
+    Object parent_obj;
+} ARMLinuxBootIf;
+
+typedef struct ARMLinuxBootIfClass {
+    /*< private >*/
+    InterfaceClass parent_class;
+
+    /*< public >*/
+    /** arm_linux_init: configure the device for a direct boot
+     * of an ARM Linux kernel (so that device reset puts it into
+     * the state the kernel expects after firmware initialization,
+     * rather than the true hardware reset state). This callback is
+     * called once after machine construction is complete (before the
+     * first system reset).
+     *
+     * @obj: the object implementing this interface
+     * @secure_boot: true if we are booting Secure, false for NonSecure
+     * (or for a CPU which doesn't support TrustZone)
+     */
+    void (*arm_linux_init)(ARMLinuxBootIf *obj, bool secure_boot);
+} ARMLinuxBootIfClass;
+
+#endif