target-lm32/cpu.c

   1 /*
   2  * QEMU LatticeMico32 CPU
   3  *
   4  * Copyright (c) 2012 SUSE LINUX Products GmbH
   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 Lesser General Public
  17  * License along with this library; if not, see
  18  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "cpu.h"
  24 #include "qemu-common.h"
  25 #include "exec/exec-all.h"
  26
  27
  28 static void lm32_cpu_set_pc(CPUState *cs, vaddr value)
  29 {
  30     LM32CPU *cpu = LM32_CPU(cs);
  31
  32     cpu->env.pc = value;
  33 }
  34
  35 /* Sort alphabetically by type name. */
  36 static gint lm32_cpu_list_compare(gconstpointer a, gconstpointer b)
  37 {
  38     ObjectClass *class_a = (ObjectClass *)a;
  39     ObjectClass *class_b = (ObjectClass *)b;
  40     const char *name_a, *name_b;
  41
  42     name_a = object_class_get_name(class_a);
  43     name_b = object_class_get_name(class_b);
  44     return strcmp(name_a, name_b);
  45 }
  46
  47 static void lm32_cpu_list_entry(gpointer data, gpointer user_data)
  48 {
  49     ObjectClass *oc = data;
  50     CPUListState *s = user_data;
  51     const char *typename = object_class_get_name(oc);
  52     char *name;
  53
  54     name = g_strndup(typename, strlen(typename) - strlen("-" TYPE_LM32_CPU));
  55     (*s->cpu_fprintf)(s->file, "  %s\n", name);
  56     g_free(name);
  57 }
  58
  59
  60 void lm32_cpu_list(FILE *f, fprintf_function cpu_fprintf)
  61 {
  62     CPUListState s = {
  63         .file = f,
  64         .cpu_fprintf = cpu_fprintf,
  65     };
  66     GSList *list;
  67
  68     list = object_class_get_list(TYPE_LM32_CPU, false);
  69     list = g_slist_sort(list, lm32_cpu_list_compare);
  70     (*cpu_fprintf)(f, "Available CPUs:\n");
  71     g_slist_foreach(list, lm32_cpu_list_entry, &s);
  72     g_slist_free(list);
  73 }
  74
  75 static void lm32_cpu_init_cfg_reg(LM32CPU *cpu)
  76 {
  77     CPULM32State *env = &cpu->env;
  78     uint32_t cfg = 0;
  79
  80     if (cpu->features & LM32_FEATURE_MULTIPLY) {
  81         cfg |= CFG_M;
  82     }
  83
  84     if (cpu->features & LM32_FEATURE_DIVIDE) {
  85         cfg |= CFG_D;
  86     }
  87
  88     if (cpu->features & LM32_FEATURE_SHIFT) {
  89         cfg |= CFG_S;
  90     }
  91
  92     if (cpu->features & LM32_FEATURE_SIGN_EXTEND) {
  93         cfg |= CFG_X;
  94     }
  95
  96     if (cpu->features & LM32_FEATURE_I_CACHE) {
  97         cfg |= CFG_IC;
  98     }
  99
 100     if (cpu->features & LM32_FEATURE_D_CACHE) {
 101         cfg |= CFG_DC;
 102     }
 103
 104     if (cpu->features & LM32_FEATURE_CYCLE_COUNT) {
 105         cfg |= CFG_CC;
 106     }
 107
 108     cfg |= (cpu->num_interrupts << CFG_INT_SHIFT);
 109     cfg |= (cpu->num_breakpoints << CFG_BP_SHIFT);
 110     cfg |= (cpu->num_watchpoints << CFG_WP_SHIFT);
 111     cfg |= (cpu->revision << CFG_REV_SHIFT);
 112
 113     env->cfg = cfg;
 114 }
 115
 116 static bool lm32_cpu_has_work(CPUState *cs)
 117 {
 118     return cs->interrupt_request & CPU_INTERRUPT_HARD;
 119 }
 120
 121 /* CPUClass::reset() */
 122 static void lm32_cpu_reset(CPUState *s)
 123 {
 124     LM32CPU *cpu = LM32_CPU(s);
 125     LM32CPUClass *lcc = LM32_CPU_GET_CLASS(cpu);
 126     CPULM32State *env = &cpu->env;
 127
 128     lcc->parent_reset(s);
 129
 130     /* reset cpu state */
 131     memset(env, 0, offsetof(CPULM32State, eba));
 132
 133     lm32_cpu_init_cfg_reg(cpu);
 134     tlb_flush(s, 1);
 135 }
 136
 137 static void lm32_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 138 {
 139     info->mach = bfd_mach_lm32;
 140     info->print_insn = print_insn_lm32;
 141 }
 142
 143 static void lm32_cpu_realizefn(DeviceState *dev, Error **errp)
 144 {
 145     CPUState *cs = CPU(dev);
 146     LM32CPUClass *lcc = LM32_CPU_GET_CLASS(dev);
 147
 148     cpu_reset(cs);
 149
 150     qemu_init_vcpu(cs);
 151
 152     lcc->parent_realize(dev, errp);
 153 }
 154
 155 static void lm32_cpu_initfn(Object *obj)
 156 {
 157     CPUState *cs = CPU(obj);
 158     LM32CPU *cpu = LM32_CPU(obj);
 159     CPULM32State *env = &cpu->env;
 160     static bool tcg_initialized;
 161
 162     cs->env_ptr = env;
 163     cpu_exec_init(cs, &error_abort);
 164
 165     env->flags = 0;
 166
 167     if (tcg_enabled() && !tcg_initialized) {
 168         tcg_initialized = true;
 169         lm32_translate_init();
 170     }
 171 }
 172
 173 static void lm32_basic_cpu_initfn(Object *obj)
 174 {
 175     LM32CPU *cpu = LM32_CPU(obj);
 176
 177     cpu->revision = 3;
 178     cpu->num_interrupts = 32;
 179     cpu->num_breakpoints = 4;
 180     cpu->num_watchpoints = 4;
 181     cpu->features = LM32_FEATURE_SHIFT
 182                   | LM32_FEATURE_SIGN_EXTEND
 183                   | LM32_FEATURE_CYCLE_COUNT;
 184 }
 185
 186 static void lm32_standard_cpu_initfn(Object *obj)
 187 {
 188     LM32CPU *cpu = LM32_CPU(obj);
 189
 190     cpu->revision = 3;
 191     cpu->num_interrupts = 32;
 192     cpu->num_breakpoints = 4;
 193     cpu->num_watchpoints = 4;
 194     cpu->features = LM32_FEATURE_MULTIPLY
 195                   | LM32_FEATURE_DIVIDE
 196                   | LM32_FEATURE_SHIFT
 197                   | LM32_FEATURE_SIGN_EXTEND
 198                   | LM32_FEATURE_I_CACHE
 199                   | LM32_FEATURE_CYCLE_COUNT;
 200 }
 201
 202 static void lm32_full_cpu_initfn(Object *obj)
 203 {
 204     LM32CPU *cpu = LM32_CPU(obj);
 205
 206     cpu->revision = 3;
 207     cpu->num_interrupts = 32;
 208     cpu->num_breakpoints = 4;
 209     cpu->num_watchpoints = 4;
 210     cpu->features = LM32_FEATURE_MULTIPLY
 211                   | LM32_FEATURE_DIVIDE
 212                   | LM32_FEATURE_SHIFT
 213                   | LM32_FEATURE_SIGN_EXTEND
 214                   | LM32_FEATURE_I_CACHE
 215                   | LM32_FEATURE_D_CACHE
 216                   | LM32_FEATURE_CYCLE_COUNT;
 217 }
 218
 219 typedef struct LM32CPUInfo {
 220     const char *name;
 221     void (*initfn)(Object *obj);
 222 } LM32CPUInfo;
 223
 224 static const LM32CPUInfo lm32_cpus[] = {
 225     {
 226         .name = "lm32-basic",
 227         .initfn = lm32_basic_cpu_initfn,
 228     },
 229     {
 230         .name = "lm32-standard",
 231         .initfn = lm32_standard_cpu_initfn,
 232     },
 233     {
 234         .name = "lm32-full",
 235         .initfn = lm32_full_cpu_initfn,
 236     },
 237 };
 238
 239 static ObjectClass *lm32_cpu_class_by_name(const char *cpu_model)
 240 {
 241     ObjectClass *oc;
 242     char *typename;
 243
 244     if (cpu_model == NULL) {
 245         return NULL;
 246     }
 247
 248     typename = g_strdup_printf("%s-" TYPE_LM32_CPU, cpu_model);
 249     oc = object_class_by_name(typename);
 250     g_free(typename);
 251     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_LM32_CPU) ||
 252                        object_class_is_abstract(oc))) {
 253         oc = NULL;
 254     }
 255     return oc;
 256 }
 257
 258 static void lm32_cpu_class_init(ObjectClass *oc, void *data)
 259 {
 260     LM32CPUClass *lcc = LM32_CPU_CLASS(oc);
 261     CPUClass *cc = CPU_CLASS(oc);
 262     DeviceClass *dc = DEVICE_CLASS(oc);
 263
 264     lcc->parent_realize = dc->realize;
 265     dc->realize = lm32_cpu_realizefn;
 266
 267     lcc->parent_reset = cc->reset;
 268     cc->reset = lm32_cpu_reset;
 269
 270     cc->class_by_name = lm32_cpu_class_by_name;
 271     cc->has_work = lm32_cpu_has_work;
 272     cc->do_interrupt = lm32_cpu_do_interrupt;
 273     cc->cpu_exec_interrupt = lm32_cpu_exec_interrupt;
 274     cc->dump_state = lm32_cpu_dump_state;
 275     cc->set_pc = lm32_cpu_set_pc;
 276     cc->gdb_read_register = lm32_cpu_gdb_read_register;
 277     cc->gdb_write_register = lm32_cpu_gdb_write_register;
 278 #ifdef CONFIG_USER_ONLY
 279     cc->handle_mmu_fault = lm32_cpu_handle_mmu_fault;
 280 #else
 281     cc->get_phys_page_debug = lm32_cpu_get_phys_page_debug;
 282     cc->vmsd = &vmstate_lm32_cpu;
 283 #endif
 284     cc->gdb_num_core_regs = 32 + 7;
 285     cc->gdb_stop_before_watchpoint = true;
 286     cc->debug_excp_handler = lm32_debug_excp_handler;
 287     cc->disas_set_info = lm32_cpu_disas_set_info;
 288
 289     /*
 290      * Reason: lm32_cpu_initfn() calls cpu_exec_init(), which saves
 291      * the object in cpus -> dangling pointer after final
 292      * object_unref().
 293      */
 294     dc->cannot_destroy_with_object_finalize_yet = true;
 295 }
 296
 297 static void lm32_register_cpu_type(const LM32CPUInfo *info)
 298 {
 299     TypeInfo type_info = {
 300         .parent = TYPE_LM32_CPU,
 301         .instance_init = info->initfn,
 302     };
 303
 304     type_info.name = g_strdup_printf("%s-" TYPE_LM32_CPU, info->name);
 305     type_register(&type_info);
 306     g_free((void *)type_info.name);
 307 }
 308
 309 static const TypeInfo lm32_cpu_type_info = {
 310     .name = TYPE_LM32_CPU,
 311     .parent = TYPE_CPU,
 312     .instance_size = sizeof(LM32CPU),
 313     .instance_init = lm32_cpu_initfn,
 314     .abstract = true,
 315     .class_size = sizeof(LM32CPUClass),
 316     .class_init = lm32_cpu_class_init,
 317 };
 318
 319 static void lm32_cpu_register_types(void)
 320 {
 321     int i;
 322
 323     type_register_static(&lm32_cpu_type_info);
 324     for (i = 0; i < ARRAY_SIZE(lm32_cpus); i++) {
 325         lm32_register_cpu_type(&lm32_cpus[i]);
 326     }
 327 }
 328
 329 type_init(lm32_cpu_register_types)