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_disas_set_info(CPUState *cpu, disassemble_info *info)
  52 {
  53     info->mach = bfd_arch_moxie;
  54     info->print_insn = print_insn_moxie;
  55 }
  56
  57 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
  58 {
  59     CPUState *cs = CPU(dev);
  60     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
  61
  62     qemu_init_vcpu(cs);
  63     cpu_reset(cs);
  64
  65     mcc->parent_realize(dev, errp);
  66 }
  67
  68 static void moxie_cpu_initfn(Object *obj)
  69 {
  70     CPUState *cs = CPU(obj);
  71     MoxieCPU *cpu = MOXIE_CPU(obj);
  72     static int inited;
  73
  74     cs->env_ptr = &cpu->env;
  75     cpu_exec_init(cs, &error_abort);
  76
  77     if (tcg_enabled() && !inited) {
  78         inited = 1;
  79         moxie_translate_init();
  80     }
  81 }
  82
  83 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  84 {
  85     ObjectClass *oc;
  86
  87     if (cpu_model == NULL) {
  88         return NULL;
  89     }
  90
  91     oc = object_class_by_name(cpu_model);
  92     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
  93                        object_class_is_abstract(oc))) {
  94         return NULL;
  95     }
  96     return oc;
  97 }
  98
  99 static void moxie_cpu_class_init(ObjectClass *oc, void *data)
 100 {
 101     DeviceClass *dc = DEVICE_CLASS(oc);
 102     CPUClass *cc = CPU_CLASS(oc);
 103     MoxieCPUClass *mcc = MOXIE_CPU_CLASS(oc);
 104
 105     mcc->parent_realize = dc->realize;
 106     dc->realize = moxie_cpu_realizefn;
 107
 108     mcc->parent_reset = cc->reset;
 109     cc->reset = moxie_cpu_reset;
 110
 111     cc->class_by_name = moxie_cpu_class_by_name;
 112
 113     cc->has_work = moxie_cpu_has_work;
 114     cc->do_interrupt = moxie_cpu_do_interrupt;
 115     cc->dump_state = moxie_cpu_dump_state;
 116     cc->set_pc = moxie_cpu_set_pc;
 117 #ifdef CONFIG_USER_ONLY
 118     cc->handle_mmu_fault = moxie_cpu_handle_mmu_fault;
 119 #else
 120     cc->get_phys_page_debug = moxie_cpu_get_phys_page_debug;
 121     cc->vmsd = &vmstate_moxie_cpu;
 122 #endif
 123     cc->disas_set_info = moxie_cpu_disas_set_info;
 124
 125     /*
 126      * Reason: moxie_cpu_initfn() calls cpu_exec_init(), which saves
 127      * the object in cpus -> dangling pointer after final
 128      * object_unref().
 129      */
 130     dc->cannot_destroy_with_object_finalize_yet = true;
 131 }
 132
 133 static void moxielite_initfn(Object *obj)
 134 {
 135     /* Set cpu feature flags */
 136 }
 137
 138 static void moxie_any_initfn(Object *obj)
 139 {
 140     /* Set cpu feature flags */
 141 }
 142
 143 typedef struct MoxieCPUInfo {
 144     const char *name;
 145     void (*initfn)(Object *obj);
 146 } MoxieCPUInfo;
 147
 148 static const MoxieCPUInfo moxie_cpus[] = {
 149     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 150     { .name = "any",            .initfn = moxie_any_initfn },
 151 };
 152
 153 MoxieCPU *cpu_moxie_init(const char *cpu_model)
 154 {
 155     return MOXIE_CPU(cpu_generic_init(TYPE_MOXIE_CPU, cpu_model));
 156 }
 157
 158 static void cpu_register(const MoxieCPUInfo *info)
 159 {
 160     TypeInfo type_info = {
 161         .parent = TYPE_MOXIE_CPU,
 162         .instance_size = sizeof(MoxieCPU),
 163         .instance_init = info->initfn,
 164         .class_size = sizeof(MoxieCPUClass),
 165     };
 166
 167     type_info.name = g_strdup_printf("%s-" TYPE_MOXIE_CPU, info->name);
 168     type_register(&type_info);
 169     g_free((void *)type_info.name);
 170 }
 171
 172 static const TypeInfo moxie_cpu_type_info = {
 173     .name = TYPE_MOXIE_CPU,
 174     .parent = TYPE_CPU,
 175     .instance_size = sizeof(MoxieCPU),
 176     .instance_init = moxie_cpu_initfn,
 177     .class_size = sizeof(MoxieCPUClass),
 178     .class_init = moxie_cpu_class_init,
 179 };
 180
 181 static void moxie_cpu_register_types(void)
 182 {
 183     int i;
 184     type_register_static(&moxie_cpu_type_info);
 185     for (i = 0; i < ARRAY_SIZE(moxie_cpus); i++) {
 186         cpu_register(&moxie_cpus[i]);
 187     }
 188 }
 189
 190 type_init(moxie_cpu_register_types)