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 "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "qemu-common.h"
  23 #include "migration/vmstate.h"
  24 #include "machine.h"
  25
  26 static void moxie_cpu_set_pc(CPUState *cs, vaddr value)
  27 {
  28     MoxieCPU *cpu = MOXIE_CPU(cs);
  29
  30     cpu->env.pc = value;
  31 }
  32
  33 static bool moxie_cpu_has_work(CPUState *cs)
  34 {
  35     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  36 }
  37
  38 static void moxie_cpu_reset(CPUState *s)
  39 {
  40     MoxieCPU *cpu = MOXIE_CPU(s);
  41     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(cpu);
  42     CPUMoxieState *env = &cpu->env;
  43
  44     mcc->parent_reset(s);
  45
  46     memset(env, 0, sizeof(CPUMoxieState));
  47     env->pc = 0x1000;
  48
  49     tlb_flush(s, 1);
  50 }
  51
  52 static void moxie_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  53 {
  54     info->mach = bfd_arch_moxie;
  55     info->print_insn = print_insn_moxie;
  56 }
  57
  58 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
  59 {
  60     CPUState *cs = CPU(dev);
  61     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
  62
  63     qemu_init_vcpu(cs);
  64     cpu_reset(cs);
  65
  66     mcc->parent_realize(dev, errp);
  67 }
  68
  69 static void moxie_cpu_initfn(Object *obj)
  70 {
  71     CPUState *cs = CPU(obj);
  72     MoxieCPU *cpu = MOXIE_CPU(obj);
  73     static int inited;
  74
  75     cs->env_ptr = &cpu->env;
  76     cpu_exec_init(cs, &error_abort);
  77
  78     if (tcg_enabled() && !inited) {
  79         inited = 1;
  80         moxie_translate_init();
  81     }
  82 }
  83
  84 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  85 {
  86     ObjectClass *oc;
  87
  88     if (cpu_model == NULL) {
  89         return NULL;
  90     }
  91
  92     oc = object_class_by_name(cpu_model);
  93     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
  94                        object_class_is_abstract(oc))) {
  95         return NULL;
  96     }
  97     return oc;
  98 }
  99
 100 static void moxie_cpu_class_init(ObjectClass *oc, void *data)
 101 {
 102     DeviceClass *dc = DEVICE_CLASS(oc);
 103     CPUClass *cc = CPU_CLASS(oc);
 104     MoxieCPUClass *mcc = MOXIE_CPU_CLASS(oc);
 105
 106     mcc->parent_realize = dc->realize;
 107     dc->realize = moxie_cpu_realizefn;
 108
 109     mcc->parent_reset = cc->reset;
 110     cc->reset = moxie_cpu_reset;
 111
 112     cc->class_by_name = moxie_cpu_class_by_name;
 113
 114     cc->has_work = moxie_cpu_has_work;
 115     cc->do_interrupt = moxie_cpu_do_interrupt;
 116     cc->dump_state = moxie_cpu_dump_state;
 117     cc->set_pc = moxie_cpu_set_pc;
 118 #ifdef CONFIG_USER_ONLY
 119     cc->handle_mmu_fault = moxie_cpu_handle_mmu_fault;
 120 #else
 121     cc->get_phys_page_debug = moxie_cpu_get_phys_page_debug;
 122     cc->vmsd = &vmstate_moxie_cpu;
 123 #endif
 124     cc->disas_set_info = moxie_cpu_disas_set_info;
 125
 126     /*
 127      * Reason: moxie_cpu_initfn() calls cpu_exec_init(), which saves
 128      * the object in cpus -> dangling pointer after final
 129      * object_unref().
 130      */
 131     dc->cannot_destroy_with_object_finalize_yet = true;
 132 }
 133
 134 static void moxielite_initfn(Object *obj)
 135 {
 136     /* Set cpu feature flags */
 137 }
 138
 139 static void moxie_any_initfn(Object *obj)
 140 {
 141     /* Set cpu feature flags */
 142 }
 143
 144 typedef struct MoxieCPUInfo {
 145     const char *name;
 146     void (*initfn)(Object *obj);
 147 } MoxieCPUInfo;
 148
 149 static const MoxieCPUInfo moxie_cpus[] = {
 150     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 151     { .name = "any",            .initfn = moxie_any_initfn },
 152 };
 153
 154 MoxieCPU *cpu_moxie_init(const char *cpu_model)
 155 {
 156     return MOXIE_CPU(cpu_generic_init(TYPE_MOXIE_CPU, cpu_model));
 157 }
 158
 159 static void cpu_register(const MoxieCPUInfo *info)
 160 {
 161     TypeInfo type_info = {
 162         .parent = TYPE_MOXIE_CPU,
 163         .instance_size = sizeof(MoxieCPU),
 164         .instance_init = info->initfn,
 165         .class_size = sizeof(MoxieCPUClass),
 166     };
 167
 168     type_info.name = g_strdup_printf("%s-" TYPE_MOXIE_CPU, info->name);
 169     type_register(&type_info);
 170     g_free((void *)type_info.name);
 171 }
 172
 173 static const TypeInfo moxie_cpu_type_info = {
 174     .name = TYPE_MOXIE_CPU,
 175     .parent = TYPE_CPU,
 176     .instance_size = sizeof(MoxieCPU),
 177     .instance_init = moxie_cpu_initfn,
 178     .class_size = sizeof(MoxieCPUClass),
 179     .class_init = moxie_cpu_class_init,
 180 };
 181
 182 static void moxie_cpu_register_types(void)
 183 {
 184     int i;
 185     type_register_static(&moxie_cpu_type_info);
 186     for (i = 0; i < ARRAY_SIZE(moxie_cpus); i++) {
 187         cpu_register(&moxie_cpus[i]);
 188     }
 189 }
 190
 191 type_init(moxie_cpu_register_types)