Hi All,
Apologies in advance for long post.
I am new to qemu, I am trying to add a machine in qemu. To add the machine i
have used following code,
#define TYPE_DRA7X_MACHINE MACHINE_TYPE_NAME("dra7x")
void dra7xSoC_init(MachineState *machine) {
int sram_size;
int flash_size;
DeviceState *nvic;
dra7x_periph_t periph;
flash_size = 16 * 1024;
sram_size = 32 * 1024;
MemoryRegion *sram = g_new(MemoryRegion, 1);
MemoryRegion *flash = g_new(MemoryRegion, 1);
MemoryRegion *system_memory = get_system_memory();
memory_region_init_ram(flash, NULL, "dra7x.flash", flash_size, &error_fatal);
memory_region_add_subregion(system_memory, 0, flash);
memory_region_init_ram(sram, NULL, "dra7x.sram", sram_size, &error_fatal);
memory_region_add_subregion(system_memory, 0x20000000, sram);
nvic = qdev_create(NULL, TYPE_ARMV7M);
printf("dra7xSoC_init(): done armv7m_instance_init \n");
qdev_prop_set_uint32(nvic, "num-irq", 0);
qdev_prop_set_string(nvic, "cpu-type", machine->cpu_type);
qdev_prop_set_bit(nvic, "enable-bitband", true);
object_property_set_link(OBJECT(nvic), OBJECT(get_system_memory()), "memory",
&error_abort);
object_property_set_bool(OBJECT(nvic), true, "realized", &error_fatal);
armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename, flash_size);
}
static void dra7x_machine_class_init(ObjectClass *oc, void *data) {
MachineClass *mc = MACHINE_CLASS(oc);
mc->desc = "dra7x";
mc->init = dra7x_init;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-m3");
}
static const TypeInfo dra7x_info = {
.name = TYPE_DRA7X_MACHINE,
.parent = TYPE_MACHINE,
.class_init = dra7x_machine_class_init,
};
static void dra7x_register_types(void)
{
type_register_static(&dra7x_info);
}
type_init(dra7x_register_types)
Now I want to add few peripheral to the machine and mapped range of guest
memory that is implemented by host callbacks; each read or write causes a
callback to be called on the host.
# to add the device
DeviceState *control_module_core_dev = qdev_create(NULL,
"dra7x-control-module-core");
SysBusDevice *s;
s = SYS_BUS_DEVICE(control_module_core_dev);
qdev_init_nofail(control_module_core_dev);
sysbus_mmio_map(s, 0, 0X4a002000);
//periph = DRA7X_L4PER_PRM;
DeviceState *l4per_prm_dev = qdev_create(NULL, "dra7x-l4per-prm");
SysBusDevice *s1;
s1 = SYS_BUS_DEVICE(l4per_prm_dev);
qdev_init_nofail(l4per_prm_dev);
sysbus_mmio_map(s1, 0, 0X4ae07400);
# to initialize memory region and register callbacks
static const MemoryRegionOps dra7x_control_module_core_ops = {
.read = dra7x_control_module_core_read,
.write = dra7x_control_module_core_write,
.valid.min_access_size = 2,
.valid.max_access_size = 4,
.endianness = DEVICE_NATIVE_ENDIAN
};
memory_region_init_io(&s->iomem, obj, &dra7x_control_module_core_ops,
s,"control_module_core", 0x2000);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
Upon writing/reading on the mapped address read/write callback is not getting
called.
Requesting expert to advise how to make it work.
Thanks,
Rahul
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