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