target-moxie/cpu.c

   1 /*
   2  * QEMU Moxie CPU
   3  *
   4  * Copyright (c) 2013 Anthony Green
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "cpu.h"
  21 #include "qemu-common.h"
  22 #include "migration/vmstate.h"
  23 #include "machine.h"
  24
  25 static void moxie_cpu_reset(CPUState *s)
  26 {
  27     MoxieCPU *cpu = MOXIE_CPU(s);
  28     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(cpu);
  29     CPUMoxieState *env = &cpu->env;
  30
  31     mcc->parent_reset(s);
  32
  33     memset(env, 0, offsetof(CPUMoxieState, breakpoints));
  34     env->pc = 0x1000;
  35
  36     tlb_flush(env, 1);
  37 }
  38
  39 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
  40 {
  41     MoxieCPU *cpu = MOXIE_CPU(dev);
  42     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
  43
  44     cpu_reset(CPU(cpu));
  45
  46     mcc->parent_realize(dev, errp);
  47 }
  48
  49 static void moxie_cpu_initfn(Object *obj)
  50 {
  51     CPUState *cs = CPU(obj);
  52     MoxieCPU *cpu = MOXIE_CPU(obj);
  53     static int inited;
  54
  55     cs->env_ptr = &cpu->env;
  56     cpu_exec_init(&cpu->env);
  57
  58     if (tcg_enabled() && !inited) {
  59         inited = 1;
  60         moxie_translate_init();
  61     }
  62 }
  63
  64 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  65 {
  66     ObjectClass *oc;
  67
  68     if (cpu_model == NULL) {
  69         return NULL;
  70     }
  71
  72     oc = object_class_by_name(cpu_model);
  73     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
  74                        object_class_is_abstract(oc))) {
  75         return NULL;
  76     }
  77     return oc;
  78 }
  79
  80 static void moxie_cpu_class_init(ObjectClass *oc, void *data)
  81 {
  82     DeviceClass *dc = DEVICE_CLASS(oc);
  83     CPUClass *cc = CPU_CLASS(oc);
  84     MoxieCPUClass *mcc = MOXIE_CPU_CLASS(oc);
  85
  86     mcc->parent_realize = dc->realize;
  87     dc->realize = moxie_cpu_realizefn;
  88
  89     mcc->parent_reset = cc->reset;
  90     cc->reset = moxie_cpu_reset;
  91
  92     cc->class_by_name = moxie_cpu_class_by_name;
  93
  94     cc->do_interrupt = moxie_cpu_do_interrupt;
  95     cc->dump_state = moxie_cpu_dump_state;
  96     cpu_class_set_vmsd(cc, &vmstate_moxie_cpu);
  97 }
  98
  99 static void moxielite_initfn(Object *obj)
 100 {
 101     /* Set cpu feature flags */
 102 }
 103
 104 static void moxie_any_initfn(Object *obj)
 105 {
 106     /* Set cpu feature flags */
 107 }
 108
 109 typedef struct MoxieCPUInfo {
 110     const char *name;
 111     void (*initfn)(Object *obj);
 112 } MoxieCPUInfo;
 113
 114 static const MoxieCPUInfo moxie_cpus[] = {
 115     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 116     { .name = "any",            .initfn = moxie_any_initfn },
 117 };
 118
 119 MoxieCPU *cpu_moxie_init(const char *cpu_model)
 120 {
 121     MoxieCPU *cpu;
 122     ObjectClass *oc;
 123
 124     oc = moxie_cpu_class_by_name(cpu_model);
 125     if (oc == NULL) {
 126         return NULL;
 127     }
 128     cpu = MOXIE_CPU(object_new(object_class_get_name(oc)));
 129     cpu->env.cpu_model_str = cpu_model;
 130
 131     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
 132
 133     return cpu;
 134 }
 135
 136 static void cpu_register(const MoxieCPUInfo *info)
 137 {
 138     TypeInfo type_info = {
 139         .parent = TYPE_MOXIE_CPU,
 140         .instance_size = sizeof(MoxieCPU),
 141         .instance_init = info->initfn,
 142         .class_size = sizeof(MoxieCPUClass),
 143     };
 144
 145     type_info.name = g_strdup_printf("%s-" TYPE_MOXIE_CPU, info->name);
 146     type_register(&type_info);
 147     g_free((void *)type_info.name);
 148 }
 149
 150 static const TypeInfo moxie_cpu_type_info = {
 151     .name = TYPE_MOXIE_CPU,
 152     .parent = TYPE_CPU,
 153     .instance_size = sizeof(MoxieCPU),
 154     .instance_init = moxie_cpu_initfn,
 155     .class_size = sizeof(MoxieCPUClass),
 156     .class_init = moxie_cpu_class_init,
 157 };
 158
 159 static void moxie_cpu_register_types(void)
 160 {
 161     int i;
 162     type_register_static(&moxie_cpu_type_info);
 163     for (i = 0; i < ARRAY_SIZE(moxie_cpus); i++) {
 164         cpu_register(&moxie_cpus[i]);
 165     }
 166 }
 167
 168 type_init(moxie_cpu_register_types)