qemu/hw/riscv/riscv_hart.c
Bin Meng 4100d5e6dc hw/riscv: hart: Add a new 'resetvec' property
RISC-V machines do not instantiate RISC-V CPUs directly, instead
they do that via the hart array. Add a new property for the reset
vector address to allow the value to be passed to the CPU, before
CPU is realized.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <1598924352-89526-3-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2020-09-09 15:54:18 -07:00

90 lines
2.7 KiB
C

/*
* QEMU RISCV Hart Array
*
* Copyright (c) 2017 SiFive, Inc.
*
* Holds the state of a homogeneous array of RISC-V harts
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "sysemu/reset.h"
#include "hw/sysbus.h"
#include "target/riscv/cpu.h"
#include "hw/qdev-properties.h"
#include "hw/riscv/riscv_hart.h"
static Property riscv_harts_props[] = {
DEFINE_PROP_UINT32("num-harts", RISCVHartArrayState, num_harts, 1),
DEFINE_PROP_UINT32("hartid-base", RISCVHartArrayState, hartid_base, 0),
DEFINE_PROP_STRING("cpu-type", RISCVHartArrayState, cpu_type),
DEFINE_PROP_UINT64("resetvec", RISCVHartArrayState, resetvec,
DEFAULT_RSTVEC),
DEFINE_PROP_END_OF_LIST(),
};
static void riscv_harts_cpu_reset(void *opaque)
{
RISCVCPU *cpu = opaque;
cpu_reset(CPU(cpu));
}
static bool riscv_hart_realize(RISCVHartArrayState *s, int idx,
char *cpu_type, Error **errp)
{
object_initialize_child(OBJECT(s), "harts[*]", &s->harts[idx], cpu_type);
qdev_prop_set_uint64(DEVICE(&s->harts[idx]), "resetvec", s->resetvec);
s->harts[idx].env.mhartid = s->hartid_base + idx;
qemu_register_reset(riscv_harts_cpu_reset, &s->harts[idx]);
return qdev_realize(DEVICE(&s->harts[idx]), NULL, errp);
}
static void riscv_harts_realize(DeviceState *dev, Error **errp)
{
RISCVHartArrayState *s = RISCV_HART_ARRAY(dev);
int n;
s->harts = g_new0(RISCVCPU, s->num_harts);
for (n = 0; n < s->num_harts; n++) {
if (!riscv_hart_realize(s, n, s->cpu_type, errp)) {
return;
}
}
}
static void riscv_harts_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_props(dc, riscv_harts_props);
dc->realize = riscv_harts_realize;
}
static const TypeInfo riscv_harts_info = {
.name = TYPE_RISCV_HART_ARRAY,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(RISCVHartArrayState),
.class_init = riscv_harts_class_init,
};
static void riscv_harts_register_types(void)
{
type_register_static(&riscv_harts_info);
}
type_init(riscv_harts_register_types)