Device tree nodes for the platform bus and its children dynamic sysbus
devices are added in a machine init done notifier. To load the dtb once,
after those latter nodes are built and before ROM freeze, the actual
arm_load_kernel existing code is moved into a notifier notify function,
arm_load_kernel_notify. arm_load_kernel now only registers the
corresponding notifier.
Machine files that do not support platform bus stay unchanged. Machine
files willing to support dynamic sysbus devices must call arm_load_kernel
before sysbus-fdt arm_register_platform_bus_fdt_creator to make sure
dynamic sysbus device nodes are integrated in the dtb.
Signed-off-by: Eric Auger <eric.au...@linaro.org>
---
v6: creation of this patch file
---
hw/arm/boot.c | 14 +++++++++++++-
include/hw/arm/arm.h | 28 ++++++++++++++++++++++++++++
2 files changed, 41 insertions(+), 1 deletion(-)
diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index 0014c34..9d8aaa0 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -476,7 +476,7 @@ static void do_cpu_reset(void *opaque)
}
}
-void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
+static void arm_load_kernel_notify(Notifier *notifier, void *data)
{
CPUState *cs;
int kernel_size;
@@ -487,6 +487,11 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info
*info)
hwaddr entry, kernel_load_offset;
int big_endian;
static const ARMInsnFixup *primary_loader;
+ ArmLoadKernelNotifier *n =
+ container_of(notifier, ArmLoadKernelNotifier, notifier);
+ ARMCPU *cpu = n->cpu;
+ struct arm_boot_info *info =
+ container_of(n, struct arm_boot_info, load_kernel_notifier);
/* CPU objects (unlike devices) are not automatically reset on system
* reset, so we must always register a handler to do so. If we're
@@ -665,3 +670,10 @@ void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info
*info)
ARM_CPU(cs)->env.boot_info = info;
}
}
+
+void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info)
+{
+ info->load_kernel_notifier.cpu = cpu;
+ info->load_kernel_notifier.notifier.notify = arm_load_kernel_notify;
+ qemu_add_machine_init_done_notifier(&info->load_kernel_notifier.notifier);
+}
diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h
index cefc9e6..88cf80b 100644
--- a/include/hw/arm/arm.h
+++ b/include/hw/arm/arm.h
@@ -19,6 +19,16 @@ qemu_irq *armv7m_init(MemoryRegion *system_memory,
int flash_size, int sram_size,
const char *kernel_filename, const char *cpu_model);
+/*
+ * struct used as a parameter of the arm_load_kernel machine init
+ * done notifier
+ */
+typedef struct {
+ ARMCPU *cpu; /* handle to the first cpu object */
+ Notifier notifier; /* actual notifier */
+} ArmLoadKernelNotifier;
+
+
/* arm_boot.c */
struct arm_boot_info {
uint64_t ram_size;
@@ -61,12 +71,30 @@ struct arm_boot_info {
* the user it should implement this hook.
*/
void (*modify_dtb)(const struct arm_boot_info *info, void *fdt);
+ /* machine init done notifier executing arm_load_dtb */
+ ArmLoadKernelNotifier load_kernel_notifier;
/* Used internally by arm_boot.c */
int is_linux;
hwaddr initrd_start;
hwaddr initrd_size;
hwaddr entry;
};
+
+/**
+ * arm_load_kernel - Loads memory with everything needed to boot
+ *
+ * @cpu: handle to the first CPU object
+ * @info: handle to the boot info struct
+ * Registers a machine init done notifier that copies to memory
+ * everything needed to boot, depending on machine and user options:
+ * kernel image, boot loaders, initrd, dtb. Also registers the CPU
+ * reset handler.
+ *
+ * In case the machine file supports the platform bus device and its
+ * dynamically instantiable sysbus devices, this function must be called
+ * before sysbus-fdt arm_register_platform_bus_fdt_creator. Indeed the
+ * machine init done notifiers are called in registration reverse order.
+ */
void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info);
/* Multiplication factor to convert from system clock ticks to qemu timer
--
1.8.3.2
