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 heterogenous 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/riscv/riscv_hart.h"
  28
  29 static Property riscv_harts_props[] = {
  30     DEFINE_PROP_UINT32("num-harts", RISCVHartArrayState, num_harts, 1),
  31     DEFINE_PROP_STRING("cpu-type", RISCVHartArrayState, cpu_type),
  32     DEFINE_PROP_END_OF_LIST(),
  33 };
  34
  35 static void riscv_harts_cpu_reset(void *opaque)
  36 {
  37     RISCVCPU *cpu = opaque;
  38     cpu_reset(CPU(cpu));
  39 }
  40
  41 static void riscv_harts_realize(DeviceState *dev, Error **errp)
  42 {
  43     RISCVHartArrayState *s = RISCV_HART_ARRAY(dev);
  44     Error *err = NULL;
  45     int n;
  46
  47     s->harts = g_new0(RISCVCPU, s->num_harts);
  48
  49     for (n = 0; n < s->num_harts; n++) {
  50         object_initialize_child(OBJECT(s), "harts[*]", &s->harts[n],
  51                                 sizeof(RISCVCPU), s->cpu_type,
  52                                 &error_abort, NULL);
  53         s->harts[n].env.mhartid = n;
  54         qemu_register_reset(riscv_harts_cpu_reset, &s->harts[n]);
  55         object_property_set_bool(OBJECT(&s->harts[n]), true,
  56                                  "realized", &err);
  57         if (err) {
  58             error_propagate(errp, err);
  59             return;
  60         }
  61     }
  62 }
  63
  64 static void riscv_harts_class_init(ObjectClass *klass, void *data)
  65 {
  66     DeviceClass *dc = DEVICE_CLASS(klass);
  67
  68     dc->props = riscv_harts_props;
  69     dc->realize = riscv_harts_realize;
  70 }
  71
  72 static const TypeInfo riscv_harts_info = {
  73     .name          = TYPE_RISCV_HART_ARRAY,
  74     .parent        = TYPE_SYS_BUS_DEVICE,
  75     .instance_size = sizeof(RISCVHartArrayState),
  76     .class_init    = riscv_harts_class_init,
  77 };
  78
  79 static void riscv_harts_register_types(void)
  80 {
  81     type_register_static(&riscv_harts_info);
  82 }
  83
  84 type_init(riscv_harts_register_types)