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hw/arm/boot: arm_load_kernel implemented as a machine init done notifier

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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.auger@linaro.org>
Reviewed-by: Shannon Zhao <zhaoshenglong@huawei.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1433244554-12898-3-git-send-email-eric.auger@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Eric Auger 2015-06-02 12:29:12 +01:00 committed by Peter Maydell
parent 11d306b9df
commit ac9d32e396
2 changed files with 41 additions and 1 deletions
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14
hw/arm/boot.c
View File

@ -557,7 +557,7 @@ static void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_t size_key,
fw_cfg_add_bytes(fw_cfg, data_key, data, size);
}
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;
@ -568,6 +568,11 @@ 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 = DO_UPCAST(ArmLoadKernelNotifier,
notifier, 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
@ -775,3 +780,10 @@ 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);
}

28
include/hw/arm/arm.h
View File

@ -13,11 +13,21 @@
#include "exec/memory.h"
#include "hw/irq.h"
#include "qemu/notify.h"
/* armv7m.c */
qemu_irq *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
const char *kernel_filename, const char *cpu_model);
/*
* struct used as a parameter of the arm_load_kernel machine init
* done notifier
*/
typedef struct {
Notifier notifier; /* actual notifier */
ARMCPU *cpu; /* handle to the first cpu object */
} ArmLoadKernelNotifier;
/* arm_boot.c */
struct arm_boot_info {
uint64_t ram_size;
@ -64,6 +74,8 @@ 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;
@ -75,6 +87,22 @@ struct arm_boot_info {
*/
bool firmware_loaded;
};
/**
* 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