hw/riscv/riscv_hart.c

   1 /*
   2  * QEMU RISCV Hart Array
   3  *
   4  * Copyright (c) 2017 SiFive, Inc.
   5  *
   6  * Holds the state of a homogeneous array of RISC-V harts
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2 or later, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "qemu/module.h"
  24 #include "sysemu/reset.h"
  25 #include "hw/sysbus.h"
  26 #include "target/riscv/cpu.h"
  27 #include "hw/qdev-properties.h"
  28 #include "hw/riscv/riscv_hart.h"
  29
  30 static Property riscv_harts_props[] = {
  31     DEFINE_PROP_UINT32("num-harts", RISCVHartArrayState, num_harts, 1),
  32     DEFINE_PROP_UINT32("hartid-base", RISCVHartArrayState, hartid_base, 0),
  33     DEFINE_PROP_STRING("cpu-type", RISCVHartArrayState, cpu_type),
  34     DEFINE_PROP_END_OF_LIST(),
  35 };
  36
  37 static void riscv_harts_cpu_reset(void *opaque)
  38 {
  39     RISCVCPU *cpu = opaque;
  40     cpu_reset(CPU(cpu));
  41 }
  42
  43 static bool riscv_hart_realize(RISCVHartArrayState *s, int idx,
  44                                char *cpu_type, Error **errp)
  45 {
  46     object_initialize_child(OBJECT(s), "harts[*]", &s->harts[idx], cpu_type);
  47     s->harts[idx].env.mhartid = s->hartid_base + idx;
  48     qemu_register_reset(riscv_harts_cpu_reset, &s->harts[idx]);
  49     return qdev_realize(DEVICE(&s->harts[idx]), NULL, errp);
  50 }
  51
  52 static void riscv_harts_realize(DeviceState *dev, Error **errp)
  53 {
  54     RISCVHartArrayState *s = RISCV_HART_ARRAY(dev);
  55     int n;
  56
  57     s->harts = g_new0(RISCVCPU, s->num_harts);
  58
  59     for (n = 0; n < s->num_harts; n++) {
  60         if (!riscv_hart_realize(s, n, s->cpu_type, errp)) {
  61             return;
  62         }
  63     }
  64 }
  65
  66 static void riscv_harts_class_init(ObjectClass *klass, void *data)
  67 {
  68     DeviceClass *dc = DEVICE_CLASS(klass);
  69
  70     device_class_set_props(dc, riscv_harts_props);
  71     dc->realize = riscv_harts_realize;
  72 }
  73
  74 static const TypeInfo riscv_harts_info = {
  75     .name          = TYPE_RISCV_HART_ARRAY,
  76     .parent        = TYPE_SYS_BUS_DEVICE,
  77     .instance_size = sizeof(RISCVHartArrayState),
  78     .class_init    = riscv_harts_class_init,
  79 };
  80
  81 static void riscv_harts_register_types(void)
  82 {
  83     type_register_static(&riscv_harts_info);
  84 }
  85
  86 type_init(riscv_harts_register_types)