hw/riscv: opentitan: Expose the resetvec as a SoC property

On the OpenTitan hardware the resetvec is fixed at the start of ROM. In
QEMU we don't run the ROM code and instead just jump to the next stage.
This means we need to be a little more flexible about what the resetvec
is.

This patch allows us to set the resetvec from the command line with
something like this:
    -global driver=riscv.lowrisc.ibex.soc,property=resetvec,value=0x20000400

This way as the next stage changes we can update the resetvec.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220914101108.82571-4-alistair.francis@wdc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/hw/riscv/opentitan.c b/hw/riscv/opentitan.c
index 45c92c9..be7ff1e 100644
--- a/hw/riscv/opentitan.c
+++ b/hw/riscv/opentitan.c
@@ -142,7 +142,7 @@ static void lowrisc_ibex_soc_realize(DeviceState *dev_soc, Error **errp)
                             &error_abort);
     object_property_set_int(OBJECT(&s->cpus), "num-harts", ms->smp.cpus,
                             &error_abort);
-    object_property_set_int(OBJECT(&s->cpus), "resetvec", 0x20000400,
+    object_property_set_int(OBJECT(&s->cpus), "resetvec", s->resetvec,
                             &error_abort);
     sysbus_realize(SYS_BUS_DEVICE(&s->cpus), &error_fatal);
 
@@ -297,10 +297,16 @@ static void lowrisc_ibex_soc_realize(DeviceState *dev_soc, Error **errp)
         memmap[IBEX_DEV_PERI].base, memmap[IBEX_DEV_PERI].size);
 }
 
+static Property lowrisc_ibex_soc_props[] = {
+    DEFINE_PROP_UINT32("resetvec", LowRISCIbexSoCState, resetvec, 0x20000400),
+    DEFINE_PROP_END_OF_LIST()
+};
+
 static void lowrisc_ibex_soc_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
 
+    device_class_set_props(dc, lowrisc_ibex_soc_props);
     dc->realize = lowrisc_ibex_soc_realize;
     /* Reason: Uses serial_hds in realize function, thus can't be used twice */
     dc->user_creatable = false;