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hw/misc/a9scu: Do not allow invalid CPU count

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Per the datasheet (DDI0407 r2p0):

  "The SCU connects one to four Cortex-A9 processors to
   the memory system through the AXI interfaces."

Change the instance_init() handler to a device_realize()
one so we can verify the property is in range, and return
an error to the caller if not.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200901144100.116742-2-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-09-01 16:40:57 +02:00 committed by Peter Maydell
parent a68694cd1f
commit 14a560359d
1 changed files with 13 additions and 5 deletions
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18
hw/misc/a9scu.c
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@ -12,8 +12,11 @@
#include "hw/misc/a9scu.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qemu/module.h"
#define A9_SCU_CPU_MAX 4
static uint64_t a9_scu_read(void *opaque, hwaddr offset,
unsigned size)
{
@ -105,12 +108,17 @@ static void a9_scu_reset(DeviceState *dev)
s->control = 0;
}
static void a9_scu_init(Object *obj)
static void a9_scu_realize(DeviceState *dev, Error **errp)
{
A9SCUState *s = A9_SCU(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
A9SCUState *s = A9_SCU(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
memory_region_init_io(&s->iomem, obj, &a9_scu_ops, s,
if (!s->num_cpu || s->num_cpu > A9_SCU_CPU_MAX) {
error_setg(errp, "Illegal CPU count: %u", s->num_cpu);
return;
}
memory_region_init_io(&s->iomem, OBJECT(s), &a9_scu_ops, s,
"a9-scu", 0x100);
sysbus_init_mmio(sbd, &s->iomem);
}
@ -138,13 +146,13 @@ static void a9_scu_class_init(ObjectClass *klass, void *data)
device_class_set_props(dc, a9_scu_properties);
dc->vmsd = &vmstate_a9_scu;
dc->reset = a9_scu_reset;
dc->realize = a9_scu_realize;
}
static const TypeInfo a9_scu_info = {
.name = TYPE_A9_SCU,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(A9SCUState),
.instance_init = a9_scu_init,
.class_init = a9_scu_class_init,
};