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