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_set_pc(CPUState *cs, vaddr value)
  26 {
  27     MoxieCPU *cpu = MOXIE_CPU(cs);
  28
  29     cpu->env.pc = value;
  30 }
  31
  32 static void moxie_cpu_reset(CPUState *s)
  33 {
  34     MoxieCPU *cpu = MOXIE_CPU(s);
  35     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(cpu);
  36     CPUMoxieState *env = &cpu->env;
  37
  38     mcc->parent_reset(s);
  39
  40     memset(env, 0, offsetof(CPUMoxieState, breakpoints));
  41     env->pc = 0x1000;
  42
  43     tlb_flush(env, 1);
  44 }
  45
  46 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
  47 {
  48     MoxieCPU *cpu = MOXIE_CPU(dev);
  49     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
  50
  51     cpu_reset(CPU(cpu));
  52
  53     mcc->parent_realize(dev, errp);
  54 }
  55
  56 static void moxie_cpu_initfn(Object *obj)
  57 {
  58     CPUState *cs = CPU(obj);
  59     MoxieCPU *cpu = MOXIE_CPU(obj);
  60     static int inited;
  61
  62     cs->env_ptr = &cpu->env;
  63     cpu_exec_init(&cpu->env);
  64
  65     if (tcg_enabled() && !inited) {
  66         inited = 1;
  67         moxie_translate_init();
  68     }
  69 }
  70
  71 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  72 {
  73     ObjectClass *oc;
  74
  75     if (cpu_model == NULL) {
  76         return NULL;
  77     }
  78
  79     oc = object_class_by_name(cpu_model);
  80     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
  81                        object_class_is_abstract(oc))) {
  82         return NULL;
  83     }
  84     return oc;
  85 }
  86
  87 static void moxie_cpu_class_init(ObjectClass *oc, void *data)
  88 {
  89     DeviceClass *dc = DEVICE_CLASS(oc);
  90     CPUClass *cc = CPU_CLASS(oc);
  91     MoxieCPUClass *mcc = MOXIE_CPU_CLASS(oc);
  92
  93     mcc->parent_realize = dc->realize;
  94     dc->realize = moxie_cpu_realizefn;
  95
  96     mcc->parent_reset = cc->reset;
  97     cc->reset = moxie_cpu_reset;
  98
  99     cc->class_by_name = moxie_cpu_class_by_name;
 100
 101     cc->do_interrupt = moxie_cpu_do_interrupt;
 102     cc->dump_state = moxie_cpu_dump_state;
 103     cc->set_pc = moxie_cpu_set_pc;
 104 #ifndef CONFIG_USER_ONLY
 105     cc->get_phys_page_debug = moxie_cpu_get_phys_page_debug;
 106     cc->vmsd = &vmstate_moxie_cpu;
 107 #endif
 108 }
 109
 110 static void moxielite_initfn(Object *obj)
 111 {
 112     /* Set cpu feature flags */
 113 }
 114
 115 static void moxie_any_initfn(Object *obj)
 116 {
 117     /* Set cpu feature flags */
 118 }
 119
 120 typedef struct MoxieCPUInfo {
 121     const char *name;
 122     void (*initfn)(Object *obj);
 123 } MoxieCPUInfo;
 124
 125 static const MoxieCPUInfo moxie_cpus[] = {
 126     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 127     { .name = "any",            .initfn = moxie_any_initfn },
 128 };
 129
 130 MoxieCPU *cpu_moxie_init(const char *cpu_model)
 131 {
 132     MoxieCPU *cpu;
 133     ObjectClass *oc;
 134
 135     oc = moxie_cpu_class_by_name(cpu_model);
 136     if (oc == NULL) {
 137         return NULL;
 138     }
 139     cpu = MOXIE_CPU(object_new(object_class_get_name(oc)));
 140     cpu->env.cpu_model_str = cpu_model;
 141
 142     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
 143
 144     return cpu;
 145 }
 146
 147 static void cpu_register(const MoxieCPUInfo *info)
 148 {
 149     TypeInfo type_info = {
 150         .parent = TYPE_MOXIE_CPU,
 151         .instance_size = sizeof(MoxieCPU),
 152         .instance_init = info->initfn,
 153         .class_size = sizeof(MoxieCPUClass),
 154     };
 155
 156     type_info.name = g_strdup_printf("%s-" TYPE_MOXIE_CPU, info->name);
 157     type_register(&type_info);
 158     g_free((void *)type_info.name);
 159 }
 160
 161 static const TypeInfo moxie_cpu_type_info = {
 162     .name = TYPE_MOXIE_CPU,
 163     .parent = TYPE_CPU,
 164     .instance_size = sizeof(MoxieCPU),
 165     .instance_init = moxie_cpu_initfn,
 166     .class_size = sizeof(MoxieCPUClass),
 167     .class_init = moxie_cpu_class_init,
 168 };
 169
 170 static void moxie_cpu_register_types(void)
 171 {
 172     int i;
 173     type_register_static(&moxie_cpu_type_info);
 174     for (i = 0; i < ARRAY_SIZE(moxie_cpus); i++) {
 175         cpu_register(&moxie_cpus[i]);
 176     }
 177 }
 178
 179 type_init(moxie_cpu_register_types)