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, sizeof(CPUMoxieState));
  49     env->pc = 0x1000;
  50
  51     tlb_flush(s, 1);
  52 }
  53
  54 static void moxie_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
  55 {
  56     info->mach = bfd_arch_moxie;
  57     info->print_insn = print_insn_moxie;
  58 }
  59
  60 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
  61 {
  62     CPUState *cs = CPU(dev);
  63     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
  64
  65     qemu_init_vcpu(cs);
  66     cpu_reset(cs);
  67
  68     mcc->parent_realize(dev, errp);
  69 }
  70
  71 static void moxie_cpu_initfn(Object *obj)
  72 {
  73     CPUState *cs = CPU(obj);
  74     MoxieCPU *cpu = MOXIE_CPU(obj);
  75     static int inited;
  76
  77     cs->env_ptr = &cpu->env;
  78     cpu_exec_init(cs, &error_abort);
  79
  80     if (tcg_enabled() && !inited) {
  81         inited = 1;
  82         moxie_translate_init();
  83     }
  84 }
  85
  86 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  87 {
  88     ObjectClass *oc;
  89
  90     if (cpu_model == NULL) {
  91         return NULL;
  92     }
  93
  94     oc = object_class_by_name(cpu_model);
  95     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_MOXIE_CPU) ||
  96                        object_class_is_abstract(oc))) {
  97         return NULL;
  98     }
  99     return oc;
 100 }
 101
 102 static void moxie_cpu_class_init(ObjectClass *oc, void *data)
 103 {
 104     DeviceClass *dc = DEVICE_CLASS(oc);
 105     CPUClass *cc = CPU_CLASS(oc);
 106     MoxieCPUClass *mcc = MOXIE_CPU_CLASS(oc);
 107
 108     mcc->parent_realize = dc->realize;
 109     dc->realize = moxie_cpu_realizefn;
 110
 111     mcc->parent_reset = cc->reset;
 112     cc->reset = moxie_cpu_reset;
 113
 114     cc->class_by_name = moxie_cpu_class_by_name;
 115
 116     cc->has_work = moxie_cpu_has_work;
 117     cc->do_interrupt = moxie_cpu_do_interrupt;
 118     cc->dump_state = moxie_cpu_dump_state;
 119     cc->set_pc = moxie_cpu_set_pc;
 120 #ifdef CONFIG_USER_ONLY
 121     cc->handle_mmu_fault = moxie_cpu_handle_mmu_fault;
 122 #else
 123     cc->get_phys_page_debug = moxie_cpu_get_phys_page_debug;
 124     cc->vmsd = &vmstate_moxie_cpu;
 125 #endif
 126     cc->disas_set_info = moxie_cpu_disas_set_info;
 127
 128     /*
 129      * Reason: moxie_cpu_initfn() calls cpu_exec_init(), which saves
 130      * the object in cpus -> dangling pointer after final
 131      * object_unref().
 132      */
 133     dc->cannot_destroy_with_object_finalize_yet = true;
 134 }
 135
 136 static void moxielite_initfn(Object *obj)
 137 {
 138     /* Set cpu feature flags */
 139 }
 140
 141 static void moxie_any_initfn(Object *obj)
 142 {
 143     /* Set cpu feature flags */
 144 }
 145
 146 typedef struct MoxieCPUInfo {
 147     const char *name;
 148     void (*initfn)(Object *obj);
 149 } MoxieCPUInfo;
 150
 151 static const MoxieCPUInfo moxie_cpus[] = {
 152     { .name = "MoxieLite",      .initfn = moxielite_initfn },
 153     { .name = "any",            .initfn = moxie_any_initfn },
 154 };
 155
 156 MoxieCPU *cpu_moxie_init(const char *cpu_model)
 157 {
 158     return MOXIE_CPU(cpu_generic_init(TYPE_MOXIE_CPU, cpu_model));
 159 }
 160
 161 static void cpu_register(const MoxieCPUInfo *info)
 162 {
 163     TypeInfo type_info = {
 164         .parent = TYPE_MOXIE_CPU,
 165         .instance_size = sizeof(MoxieCPU),
 166         .instance_init = info->initfn,
 167         .class_size = sizeof(MoxieCPUClass),
 168     };
 169
 170     type_info.name = g_strdup_printf("%s-" TYPE_MOXIE_CPU, info->name);
 171     type_register(&type_info);
 172     g_free((void *)type_info.name);
 173 }
 174
 175 static const TypeInfo moxie_cpu_type_info = {
 176     .name = TYPE_MOXIE_CPU,
 177     .parent = TYPE_CPU,
 178     .instance_size = sizeof(MoxieCPU),
 179     .instance_init = moxie_cpu_initfn,
 180     .class_size = sizeof(MoxieCPUClass),
 181     .class_init = moxie_cpu_class_init,
 182 };
 183
 184 static void moxie_cpu_register_types(void)
 185 {
 186     int i;
 187     type_register_static(&moxie_cpu_type_info);
 188     for (i = 0; i < ARRAY_SIZE(moxie_cpus); i++) {
 189         cpu_register(&moxie_cpus[i]);
 190     }
 191 }
 192
 193 type_init(moxie_cpu_register_types)