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/*
* ARM11MPCore Snoop Control Unit (SCU) emulation
*
* Copyright (c) 2006-2007 CodeSourcery.
* Copyright (c) 2013 SUSE LINUX Products GmbH
* Written by Paul Brook and Andreas Färber
*
* This code is licensed under the GPL.
*/
#include "qemu/osdep.h"
#include "hw/misc/arm11scu.h"
#include "qemu/log.h"
static uint64_t mpcore_scu_read(void *opaque, hwaddr offset,
unsigned size)
{
ARM11SCUState *s = (ARM11SCUState *)opaque;
int id;
/* SCU */
switch (offset) {
case 0x00: /* Control. */
return s->control;
case 0x04: /* Configuration. */
id = ((1 << s->num_cpu) - 1) << 4;
return id | (s->num_cpu - 1);
case 0x08: /* CPU status. */
return 0;
case 0x0c: /* Invalidate all. */
return 0;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"mpcore_priv_read: Bad offset %x\n", (int)offset);
return 0;
}
}
static void mpcore_scu_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
ARM11SCUState *s = (ARM11SCUState *)opaque;
/* SCU */
switch (offset) {
case 0: /* Control register. */
s->control = value & 1;
break;
case 0x0c: /* Invalidate all. */
/* This is a no-op as cache is not emulated. */
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"mpcore_priv_read: Bad offset %x\n", (int)offset);
}
}
static const MemoryRegionOps mpcore_scu_ops = {
.read = mpcore_scu_read,
.write = mpcore_scu_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void arm11_scu_realize(DeviceState *dev, Error **errp)
{
}
static void arm11_scu_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
ARM11SCUState *s = ARM11_SCU(obj);
memory_region_init_io(&s->iomem, OBJECT(s),
&mpcore_scu_ops, s, "mpcore-scu", 0x100);
sysbus_init_mmio(sbd, &s->iomem);
}
static Property arm11_scu_properties[] = {
DEFINE_PROP_UINT32("num-cpu", ARM11SCUState, num_cpu, 1),
DEFINE_PROP_END_OF_LIST()
};
static void arm11_scu_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = arm11_scu_realize;
dc->props = arm11_scu_properties;
}
static const TypeInfo arm11_scu_type_info = {
.name = TYPE_ARM11_SCU,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(ARM11SCUState),
.instance_init = arm11_scu_init,
.class_init = arm11_scu_class_init,
};
static void arm11_scu_register_types(void)
{
type_register_static(&arm11_scu_type_info);
}
type_init(arm11_scu_register_types)
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