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 "qapi/error.h"
  22 #include "cpu.h"
  23 #include "qemu-common.h"
  24 #include "migration/vmstate.h"
  25 #include "machine.h"
  26 #include "exec/exec-all.h"
  27
  28 static void moxie_cpu_set_pc(CPUState *cs, vaddr value)
  29 {
  30     MoxieCPU *cpu = MOXIE_CPU(cs);
  31
  32     cpu->env.pc = value;
  33 }
  34
  35 static bool moxie_cpu_has_work(CPUState *cs)
  36 {
  37     return cs->interrupt_request & CPU_INTERRUPT_HARD;
  38 }
  39
  40 static void moxie_cpu_reset(CPUState *s)
  41 {
  42     MoxieCPU *cpu = MOXIE_CPU(s);
  43     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(cpu);
  44     CPUMoxieState *env = &cpu->env;
  45
  46     mcc->parent_reset(s);
  47
  48     memset(env, 0, offsetof(CPUMoxieState, end_reset_fields));
  49     env->pc = 0x1000;
  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     Error *local_err = NULL;
  63
  64     cpu_exec_realizefn(cs, &local_err);
  65     if (local_err != NULL) {
  66         error_propagate(errp, local_err);
  67         return;
  68     }
  69
  70     qemu_init_vcpu(cs);
  71     cpu_reset(cs);
  72
  73     mcc->parent_realize(dev, errp);
  74 }
  75
  76 static void moxie_cpu_initfn(Object *obj)
  77 {
  78     CPUState *cs = CPU(obj);
  79     MoxieCPU *cpu = MOXIE_CPU(obj);
  80     static int inited;
  81
  82     cs->env_ptr = &cpu->env;
  83
  84     if (tcg_enabled() && !inited) {
  85         inited = 1;
  86         moxie_translate_init();
  87     }
  88 }
  89
  90 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  91 {
  92     ObjectClass *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 static void moxielite_initfn(Object *obj)
 128 {
 129     /* Set cpu feature flags */
 130 }
 131
 132 static void moxie_any_initfn(Object *obj)
 133 {
 134     /* Set cpu feature flags */
 135 }
 136
 137 typedef struct MoxieCPUInfo {
 138     const char *name;
 139     void (*initfn)(Object *obj);
 140 } MoxieCPUInfo;
 141
 142 static const MoxieCPUInfo moxie_cpus[] = {
 143     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 144     { .name = "any",            .initfn = moxie_any_initfn },
 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)