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
  81     cs->env_ptr = &cpu->env;
  82 }
  83
  84 static ObjectClass *moxie_cpu_class_by_name(const char *cpu_model)
  85 {
  86     ObjectClass *oc;
  87     char *typename;
  88
  89     typename = g_strdup_printf(MOXIE_CPU_TYPE_NAME("%s"), cpu_model);
  90     oc = object_class_by_name(typename);
  91     g_free(typename);
  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     device_class_set_parent_realize(dc, moxie_cpu_realizefn,
 106                                     &mcc->parent_realize);
 107     mcc->parent_reset = cc->reset;
 108     cc->reset = moxie_cpu_reset;
 109
 110     cc->class_by_name = moxie_cpu_class_by_name;
 111
 112     cc->has_work = moxie_cpu_has_work;
 113     cc->do_interrupt = moxie_cpu_do_interrupt;
 114     cc->dump_state = moxie_cpu_dump_state;
 115     cc->set_pc = moxie_cpu_set_pc;
 116 #ifdef CONFIG_USER_ONLY
 117     cc->handle_mmu_fault = moxie_cpu_handle_mmu_fault;
 118 #else
 119     cc->get_phys_page_debug = moxie_cpu_get_phys_page_debug;
 120     cc->vmsd = &vmstate_moxie_cpu;
 121 #endif
 122     cc->disas_set_info = moxie_cpu_disas_set_info;
 123     cc->tcg_initialize = moxie_translate_init;
 124 }
 125
 126 static void moxielite_initfn(Object *obj)
 127 {
 128     /* Set cpu feature flags */
 129 }
 130
 131 static void moxie_any_initfn(Object *obj)
 132 {
 133     /* Set cpu feature flags */
 134 }
 135
 136 #define DEFINE_MOXIE_CPU_TYPE(cpu_model, initfn) \
 137     {                                            \
 138         .parent = TYPE_MOXIE_CPU,                \
 139         .instance_init = initfn,                 \
 140         .name = MOXIE_CPU_TYPE_NAME(cpu_model),  \
 141     }
 142
 143 static const TypeInfo moxie_cpus_type_infos[] = {
 144     { /* base class should be registered first */
 145         .name = TYPE_MOXIE_CPU,
 146         .parent = TYPE_CPU,
 147         .instance_size = sizeof(MoxieCPU),
 148         .instance_init = moxie_cpu_initfn,
 149         .class_size = sizeof(MoxieCPUClass),
 150         .class_init = moxie_cpu_class_init,
 151     },
 152     DEFINE_MOXIE_CPU_TYPE("MoxieLite", moxielite_initfn),
 153     DEFINE_MOXIE_CPU_TYPE("any", moxie_any_initfn),
 154 };
 155
 156 DEFINE_TYPES(moxie_cpus_type_infos)