target/mips/cpu.c

   1 /*
   2  * QEMU MIPS 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 "internal.h"
  25 #include "kvm_mips.h"
  26 #include "qemu-common.h"
  27 #include "sysemu/kvm.h"
  28 #include "exec/exec-all.h"
  29
  30
  31 static void mips_cpu_set_pc(CPUState *cs, vaddr value)
  32 {
  33     MIPSCPU *cpu = MIPS_CPU(cs);
  34     CPUMIPSState *env = &cpu->env;
  35
  36     env->active_tc.PC = value & ~(target_ulong)1;
  37     if (value & 1) {
  38         env->hflags |= MIPS_HFLAG_M16;
  39     } else {
  40         env->hflags &= ~(MIPS_HFLAG_M16);
  41     }
  42 }
  43
  44 static void mips_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
  45 {
  46     MIPSCPU *cpu = MIPS_CPU(cs);
  47     CPUMIPSState *env = &cpu->env;
  48
  49     env->active_tc.PC = tb->pc;
  50     env->hflags &= ~MIPS_HFLAG_BMASK;
  51     env->hflags |= tb->flags & MIPS_HFLAG_BMASK;
  52 }
  53
  54 static bool mips_cpu_has_work(CPUState *cs)
  55 {
  56     MIPSCPU *cpu = MIPS_CPU(cs);
  57     CPUMIPSState *env = &cpu->env;
  58     bool has_work = false;
  59
  60     /* Prior to MIPS Release 6 it is implementation dependent if non-enabled
  61        interrupts wake-up the CPU, however most of the implementations only
  62        check for interrupts that can be taken. */
  63     if ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  64         cpu_mips_hw_interrupts_pending(env)) {
  65         if (cpu_mips_hw_interrupts_enabled(env) ||
  66             (env->insn_flags & ISA_MIPS32R6)) {
  67             has_work = true;
  68         }
  69     }
  70
  71     /* MIPS-MT has the ability to halt the CPU.  */
  72     if (env->CP0_Config3 & (1 << CP0C3_MT)) {
  73         /* The QEMU model will issue an _WAKE request whenever the CPUs
  74            should be woken up.  */
  75         if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
  76             has_work = true;
  77         }
  78
  79         if (!mips_vpe_active(env)) {
  80             has_work = false;
  81         }
  82     }
  83     /* MIPS Release 6 has the ability to halt the CPU.  */
  84     if (env->CP0_Config5 & (1 << CP0C5_VP)) {
  85         if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
  86             has_work = true;
  87         }
  88         if (!mips_vp_active(env)) {
  89             has_work = false;
  90         }
  91     }
  92     return has_work;
  93 }
  94
  95 /* CPUClass::reset() */
  96 static void mips_cpu_reset(CPUState *s)
  97 {
  98     MIPSCPU *cpu = MIPS_CPU(s);
  99     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(cpu);
 100     CPUMIPSState *env = &cpu->env;
 101
 102     mcc->parent_reset(s);
 103
 104     memset(env, 0, offsetof(CPUMIPSState, end_reset_fields));
 105
 106     cpu_state_reset(env);
 107
 108 #ifndef CONFIG_USER_ONLY
 109     if (kvm_enabled()) {
 110         kvm_mips_reset_vcpu(cpu);
 111     }
 112 #endif
 113 }
 114
 115 static void mips_cpu_disas_set_info(CPUState *s, disassemble_info *info) {
 116 #ifdef TARGET_WORDS_BIGENDIAN
 117     info->print_insn = print_insn_big_mips;
 118 #else
 119     info->print_insn = print_insn_little_mips;
 120 #endif
 121 }
 122
 123 static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
 124 {
 125     CPUState *cs = CPU(dev);
 126     MIPSCPU *cpu = MIPS_CPU(dev);
 127     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(dev);
 128     Error *local_err = NULL;
 129
 130     cpu_exec_realizefn(cs, &local_err);
 131     if (local_err != NULL) {
 132         error_propagate(errp, local_err);
 133         return;
 134     }
 135
 136     cpu_mips_realize_env(&cpu->env);
 137
 138     cpu_reset(cs);
 139     qemu_init_vcpu(cs);
 140
 141     mcc->parent_realize(dev, errp);
 142 }
 143
 144 static void mips_cpu_initfn(Object *obj)
 145 {
 146     CPUState *cs = CPU(obj);
 147     MIPSCPU *cpu = MIPS_CPU(obj);
 148     CPUMIPSState *env = &cpu->env;
 149     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(obj);
 150
 151     cs->env_ptr = env;
 152     env->cpu_model = mcc->cpu_def;
 153
 154     if (tcg_enabled()) {
 155         mips_tcg_init();
 156     }
 157 }
 158
 159 static char *mips_cpu_type_name(const char *cpu_model)
 160 {
 161     return g_strdup_printf("%s-" TYPE_MIPS_CPU, cpu_model);
 162 }
 163
 164 static ObjectClass *mips_cpu_class_by_name(const char *cpu_model)
 165 {
 166     ObjectClass *oc;
 167     char *typename;
 168
 169     typename = mips_cpu_type_name(cpu_model);
 170     oc = object_class_by_name(typename);
 171     g_free(typename);
 172     return oc;
 173 }
 174
 175 static void mips_cpu_class_init(ObjectClass *c, void *data)
 176 {
 177     MIPSCPUClass *mcc = MIPS_CPU_CLASS(c);
 178     CPUClass *cc = CPU_CLASS(c);
 179     DeviceClass *dc = DEVICE_CLASS(c);
 180
 181     mcc->parent_realize = dc->realize;
 182     dc->realize = mips_cpu_realizefn;
 183
 184     mcc->parent_reset = cc->reset;
 185     cc->reset = mips_cpu_reset;
 186
 187     cc->class_by_name = mips_cpu_class_by_name;
 188     cc->has_work = mips_cpu_has_work;
 189     cc->do_interrupt = mips_cpu_do_interrupt;
 190     cc->cpu_exec_interrupt = mips_cpu_exec_interrupt;
 191     cc->dump_state = mips_cpu_dump_state;
 192     cc->set_pc = mips_cpu_set_pc;
 193     cc->synchronize_from_tb = mips_cpu_synchronize_from_tb;
 194     cc->gdb_read_register = mips_cpu_gdb_read_register;
 195     cc->gdb_write_register = mips_cpu_gdb_write_register;
 196 #ifdef CONFIG_USER_ONLY
 197     cc->handle_mmu_fault = mips_cpu_handle_mmu_fault;
 198 #else
 199     cc->do_unassigned_access = mips_cpu_unassigned_access;
 200     cc->do_unaligned_access = mips_cpu_do_unaligned_access;
 201     cc->get_phys_page_debug = mips_cpu_get_phys_page_debug;
 202     cc->vmsd = &vmstate_mips_cpu;
 203 #endif
 204     cc->disas_set_info = mips_cpu_disas_set_info;
 205
 206     cc->gdb_num_core_regs = 73;
 207     cc->gdb_stop_before_watchpoint = true;
 208 }
 209
 210 static const TypeInfo mips_cpu_type_info = {
 211     .name = TYPE_MIPS_CPU,
 212     .parent = TYPE_CPU,
 213     .instance_size = sizeof(MIPSCPU),
 214     .instance_init = mips_cpu_initfn,
 215     .abstract = true,
 216     .class_size = sizeof(MIPSCPUClass),
 217     .class_init = mips_cpu_class_init,
 218 };
 219
 220 static void mips_cpu_cpudef_class_init(ObjectClass *oc, void *data)
 221 {
 222     MIPSCPUClass *mcc = MIPS_CPU_CLASS(oc);
 223     mcc->cpu_def = data;
 224 }
 225
 226 static void mips_register_cpudef_type(const struct mips_def_t *def)
 227 {
 228     char *typename = mips_cpu_type_name(def->name);
 229     TypeInfo ti = {
 230         .name = typename,
 231         .parent = TYPE_MIPS_CPU,
 232         .class_init = mips_cpu_cpudef_class_init,
 233         .class_data = (void *)def,
 234     };
 235
 236     type_register(&ti);
 237     g_free(typename);
 238 }
 239
 240 static void mips_cpu_register_types(void)
 241 {
 242     int i;
 243
 244     type_register_static(&mips_cpu_type_info);
 245     for (i = 0; i < mips_defs_number; i++) {
 246         mips_register_cpudef_type(&mips_defs[i]);
 247     }
 248 }
 249
 250 type_init(mips_cpu_register_types)