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