target-openrisc/cpu.c

   1 /*
   2  * QEMU OpenRISC CPU
   3  *
   4  * Copyright (c) 2012 Jia Liu <proljc@gmail.com>
   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 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 Lesser General Public
  17  * License along with this library; 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
  25 static void openrisc_cpu_set_pc(CPUState *cs, vaddr value)
  26 {
  27     OpenRISCCPU *cpu = OPENRISC_CPU(cs);
  28
  29     cpu->env.pc = value;
  30 }
  31
  32 static bool openrisc_cpu_has_work(CPUState *cs)
  33 {
  34     return cs->interrupt_request & (CPU_INTERRUPT_HARD |
  35                                     CPU_INTERRUPT_TIMER);
  36 }
  37
  38 /* CPUClass::reset() */
  39 static void openrisc_cpu_reset(CPUState *s)
  40 {
  41     OpenRISCCPU *cpu = OPENRISC_CPU(s);
  42     OpenRISCCPUClass *occ = OPENRISC_CPU_GET_CLASS(cpu);
  43
  44     occ->parent_reset(s);
  45
  46 #ifndef CONFIG_USER_ONLY
  47     memset(&cpu->env, 0, offsetof(CPUOpenRISCState, tlb));
  48 #else
  49     memset(&cpu->env, 0, offsetof(CPUOpenRISCState, irq));
  50 #endif
  51
  52     tlb_flush(s, 1);
  53     /*tb_flush(&cpu->env);    FIXME: Do we need it?  */
  54
  55     cpu->env.pc = 0x100;
  56     cpu->env.sr = SR_FO | SR_SM;
  57     s->exception_index = -1;
  58
  59     cpu->env.upr = UPR_UP | UPR_DMP | UPR_IMP | UPR_PICP | UPR_TTP;
  60     cpu->env.cpucfgr = CPUCFGR_OB32S | CPUCFGR_OF32S;
  61     cpu->env.dmmucfgr = (DMMUCFGR_NTW & (0 << 2)) | (DMMUCFGR_NTS & (6 << 2));
  62     cpu->env.immucfgr = (IMMUCFGR_NTW & (0 << 2)) | (IMMUCFGR_NTS & (6 << 2));
  63
  64 #ifndef CONFIG_USER_ONLY
  65     cpu->env.picmr = 0x00000000;
  66     cpu->env.picsr = 0x00000000;
  67
  68     cpu->env.ttmr = 0x00000000;
  69     cpu->env.ttcr = 0x00000000;
  70 #endif
  71 }
  72
  73 static inline void set_feature(OpenRISCCPU *cpu, int feature)
  74 {
  75     cpu->feature |= feature;
  76     cpu->env.cpucfgr = cpu->feature;
  77 }
  78
  79 static void openrisc_cpu_realizefn(DeviceState *dev, Error **errp)
  80 {
  81     CPUState *cs = CPU(dev);
  82     OpenRISCCPUClass *occ = OPENRISC_CPU_GET_CLASS(dev);
  83
  84     qemu_init_vcpu(cs);
  85     cpu_reset(cs);
  86
  87     occ->parent_realize(dev, errp);
  88 }
  89
  90 static void openrisc_cpu_initfn(Object *obj)
  91 {
  92     CPUState *cs = CPU(obj);
  93     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
  94     static int inited;
  95
  96     cs->env_ptr = &cpu->env;
  97     cpu_exec_init(cs, &error_abort);
  98
  99 #ifndef CONFIG_USER_ONLY
 100     cpu_openrisc_mmu_init(cpu);
 101 #endif
 102
 103     if (tcg_enabled() && !inited) {
 104         inited = 1;
 105         openrisc_translate_init();
 106     }
 107 }
 108
 109 /* CPU models */
 110
 111 static ObjectClass *openrisc_cpu_class_by_name(const char *cpu_model)
 112 {
 113     ObjectClass *oc;
 114     char *typename;
 115
 116     if (cpu_model == NULL) {
 117         return NULL;
 118     }
 119
 120     typename = g_strdup_printf("%s-" TYPE_OPENRISC_CPU, cpu_model);
 121     oc = object_class_by_name(typename);
 122     g_free(typename);
 123     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_OPENRISC_CPU) ||
 124                        object_class_is_abstract(oc))) {
 125         return NULL;
 126     }
 127     return oc;
 128 }
 129
 130 static void or1200_initfn(Object *obj)
 131 {
 132     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
 133
 134     set_feature(cpu, OPENRISC_FEATURE_OB32S);
 135     set_feature(cpu, OPENRISC_FEATURE_OF32S);
 136 }
 137
 138 static void openrisc_any_initfn(Object *obj)
 139 {
 140     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
 141
 142     set_feature(cpu, OPENRISC_FEATURE_OB32S);
 143 }
 144
 145 typedef struct OpenRISCCPUInfo {
 146     const char *name;
 147     void (*initfn)(Object *obj);
 148 } OpenRISCCPUInfo;
 149
 150 static const OpenRISCCPUInfo openrisc_cpus[] = {
 151     { .name = "or1200",      .initfn = or1200_initfn },
 152     { .name = "any",         .initfn = openrisc_any_initfn },
 153 };
 154
 155 static void openrisc_cpu_class_init(ObjectClass *oc, void *data)
 156 {
 157     OpenRISCCPUClass *occ = OPENRISC_CPU_CLASS(oc);
 158     CPUClass *cc = CPU_CLASS(occ);
 159     DeviceClass *dc = DEVICE_CLASS(oc);
 160
 161     occ->parent_realize = dc->realize;
 162     dc->realize = openrisc_cpu_realizefn;
 163
 164     occ->parent_reset = cc->reset;
 165     cc->reset = openrisc_cpu_reset;
 166
 167     cc->class_by_name = openrisc_cpu_class_by_name;
 168     cc->has_work = openrisc_cpu_has_work;
 169     cc->do_interrupt = openrisc_cpu_do_interrupt;
 170     cc->cpu_exec_interrupt = openrisc_cpu_exec_interrupt;
 171     cc->dump_state = openrisc_cpu_dump_state;
 172     cc->set_pc = openrisc_cpu_set_pc;
 173     cc->gdb_read_register = openrisc_cpu_gdb_read_register;
 174     cc->gdb_write_register = openrisc_cpu_gdb_write_register;
 175 #ifdef CONFIG_USER_ONLY
 176     cc->handle_mmu_fault = openrisc_cpu_handle_mmu_fault;
 177 #else
 178     cc->get_phys_page_debug = openrisc_cpu_get_phys_page_debug;
 179     dc->vmsd = &vmstate_openrisc_cpu;
 180 #endif
 181     cc->gdb_num_core_regs = 32 + 3;
 182
 183     /*
 184      * Reason: openrisc_cpu_initfn() calls cpu_exec_init(), which saves
 185      * the object in cpus -> dangling pointer after final
 186      * object_unref().
 187      */
 188     dc->cannot_destroy_with_object_finalize_yet = true;
 189 }
 190
 191 static void cpu_register(const OpenRISCCPUInfo *info)
 192 {
 193     TypeInfo type_info = {
 194         .parent = TYPE_OPENRISC_CPU,
 195         .instance_size = sizeof(OpenRISCCPU),
 196         .instance_init = info->initfn,
 197         .class_size = sizeof(OpenRISCCPUClass),
 198     };
 199
 200     type_info.name = g_strdup_printf("%s-" TYPE_OPENRISC_CPU, info->name);
 201     type_register(&type_info);
 202     g_free((void *)type_info.name);
 203 }
 204
 205 static const TypeInfo openrisc_cpu_type_info = {
 206     .name = TYPE_OPENRISC_CPU,
 207     .parent = TYPE_CPU,
 208     .instance_size = sizeof(OpenRISCCPU),
 209     .instance_init = openrisc_cpu_initfn,
 210     .abstract = true,
 211     .class_size = sizeof(OpenRISCCPUClass),
 212     .class_init = openrisc_cpu_class_init,
 213 };
 214
 215 static void openrisc_cpu_register_types(void)
 216 {
 217     int i;
 218
 219     type_register_static(&openrisc_cpu_type_info);
 220     for (i = 0; i < ARRAY_SIZE(openrisc_cpus); i++) {
 221         cpu_register(&openrisc_cpus[i]);
 222     }
 223 }
 224
 225 OpenRISCCPU *cpu_openrisc_init(const char *cpu_model)
 226 {
 227     return OPENRISC_CPU(cpu_generic_init(TYPE_OPENRISC_CPU, cpu_model));
 228 }
 229
 230 /* Sort alphabetically by type name, except for "any". */
 231 static gint openrisc_cpu_list_compare(gconstpointer a, gconstpointer b)
 232 {
 233     ObjectClass *class_a = (ObjectClass *)a;
 234     ObjectClass *class_b = (ObjectClass *)b;
 235     const char *name_a, *name_b;
 236
 237     name_a = object_class_get_name(class_a);
 238     name_b = object_class_get_name(class_b);
 239     if (strcmp(name_a, "any-" TYPE_OPENRISC_CPU) == 0) {
 240         return 1;
 241     } else if (strcmp(name_b, "any-" TYPE_OPENRISC_CPU) == 0) {
 242         return -1;
 243     } else {
 244         return strcmp(name_a, name_b);
 245     }
 246 }
 247
 248 static void openrisc_cpu_list_entry(gpointer data, gpointer user_data)
 249 {
 250     ObjectClass *oc = data;
 251     CPUListState *s = user_data;
 252     const char *typename;
 253     char *name;
 254
 255     typename = object_class_get_name(oc);
 256     name = g_strndup(typename,
 257                      strlen(typename) - strlen("-" TYPE_OPENRISC_CPU));
 258     (*s->cpu_fprintf)(s->file, "  %s\n",
 259                       name);
 260     g_free(name);
 261 }
 262
 263 void cpu_openrisc_list(FILE *f, fprintf_function cpu_fprintf)
 264 {
 265     CPUListState s = {
 266         .file = f,
 267         .cpu_fprintf = cpu_fprintf,
 268     };
 269     GSList *list;
 270
 271     list = object_class_get_list(TYPE_OPENRISC_CPU, false);
 272     list = g_slist_sort(list, openrisc_cpu_list_compare);
 273     (*cpu_fprintf)(f, "Available CPUs:\n");
 274     g_slist_foreach(list, openrisc_cpu_list_entry, &s);
 275     g_slist_free(list);
 276 }
 277
 278 type_init(openrisc_cpu_register_types)