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 "cpu.h"
  22 #include "kvm_mips.h"
  23 #include "qemu-common.h"
  24 #include "sysemu/kvm.h"
  25
  26
  27 static void mips_cpu_set_pc(CPUState *cs, vaddr value)
  28 {
  29     MIPSCPU *cpu = MIPS_CPU(cs);
  30     CPUMIPSState *env = &cpu->env;
  31
  32     env->active_tc.PC = value & ~(target_ulong)1;
  33     if (value & 1) {
  34         env->hflags |= MIPS_HFLAG_M16;
  35     } else {
  36         env->hflags &= ~(MIPS_HFLAG_M16);
  37     }
  38 }
  39
  40 static void mips_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
  41 {
  42     MIPSCPU *cpu = MIPS_CPU(cs);
  43     CPUMIPSState *env = &cpu->env;
  44
  45     env->active_tc.PC = tb->pc;
  46     env->hflags &= ~MIPS_HFLAG_BMASK;
  47     env->hflags |= tb->flags & MIPS_HFLAG_BMASK;
  48 }
  49
  50 static bool mips_cpu_has_work(CPUState *cs)
  51 {
  52     MIPSCPU *cpu = MIPS_CPU(cs);
  53     CPUMIPSState *env = &cpu->env;
  54     bool has_work = false;
  55
  56     /* It is implementation dependent if non-enabled interrupts
  57        wake-up the CPU, however most of the implementations only
  58        check for interrupts that can be taken. */
  59     if ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  60         cpu_mips_hw_interrupts_pending(env)) {
  61         has_work = true;
  62     }
  63
  64     /* MIPS-MT has the ability to halt the CPU.  */
  65     if (env->CP0_Config3 & (1 << CP0C3_MT)) {
  66         /* The QEMU model will issue an _WAKE request whenever the CPUs
  67            should be woken up.  */
  68         if (cs->interrupt_request & CPU_INTERRUPT_WAKE) {
  69             has_work = true;
  70         }
  71
  72         if (!mips_vpe_active(env)) {
  73             has_work = false;
  74         }
  75     }
  76     return has_work;
  77 }
  78
  79 /* CPUClass::reset() */
  80 static void mips_cpu_reset(CPUState *s)
  81 {
  82     MIPSCPU *cpu = MIPS_CPU(s);
  83     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(cpu);
  84     CPUMIPSState *env = &cpu->env;
  85
  86     mcc->parent_reset(s);
  87
  88     memset(env, 0, offsetof(CPUMIPSState, mvp));
  89     tlb_flush(s, 1);
  90
  91     cpu_state_reset(env);
  92
  93 #ifndef CONFIG_USER_ONLY
  94     if (kvm_enabled()) {
  95         kvm_mips_reset_vcpu(cpu);
  96     }
  97 #endif
  98 }
  99
 100 static void mips_cpu_disas_set_info(CPUState *s, disassemble_info *info) {
 101 #ifdef TARGET_WORDS_BIGENDIAN
 102     info->print_insn = print_insn_big_mips;
 103 #else
 104     info->print_insn = print_insn_little_mips;
 105 #endif
 106 }
 107
 108 static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
 109 {
 110     CPUState *cs = CPU(dev);
 111     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(dev);
 112
 113     cpu_reset(cs);
 114     qemu_init_vcpu(cs);
 115
 116     mcc->parent_realize(dev, errp);
 117 }
 118
 119 static void mips_cpu_initfn(Object *obj)
 120 {
 121     CPUState *cs = CPU(obj);
 122     MIPSCPU *cpu = MIPS_CPU(obj);
 123     CPUMIPSState *env = &cpu->env;
 124
 125     cs->env_ptr = env;
 126     cpu_exec_init(cs, &error_abort);
 127
 128     if (tcg_enabled()) {
 129         mips_tcg_init();
 130     }
 131 }
 132
 133 static void mips_cpu_class_init(ObjectClass *c, void *data)
 134 {
 135     MIPSCPUClass *mcc = MIPS_CPU_CLASS(c);
 136     CPUClass *cc = CPU_CLASS(c);
 137     DeviceClass *dc = DEVICE_CLASS(c);
 138
 139     mcc->parent_realize = dc->realize;
 140     dc->realize = mips_cpu_realizefn;
 141
 142     mcc->parent_reset = cc->reset;
 143     cc->reset = mips_cpu_reset;
 144
 145     cc->has_work = mips_cpu_has_work;
 146     cc->do_interrupt = mips_cpu_do_interrupt;
 147     cc->cpu_exec_interrupt = mips_cpu_exec_interrupt;
 148     cc->dump_state = mips_cpu_dump_state;
 149     cc->set_pc = mips_cpu_set_pc;
 150     cc->synchronize_from_tb = mips_cpu_synchronize_from_tb;
 151     cc->gdb_read_register = mips_cpu_gdb_read_register;
 152     cc->gdb_write_register = mips_cpu_gdb_write_register;
 153 #ifdef CONFIG_USER_ONLY
 154     cc->handle_mmu_fault = mips_cpu_handle_mmu_fault;
 155 #else
 156     cc->do_unassigned_access = mips_cpu_unassigned_access;
 157     cc->do_unaligned_access = mips_cpu_do_unaligned_access;
 158     cc->get_phys_page_debug = mips_cpu_get_phys_page_debug;
 159     cc->vmsd = &vmstate_mips_cpu;
 160 #endif
 161     cc->disas_set_info = mips_cpu_disas_set_info;
 162
 163     cc->gdb_num_core_regs = 73;
 164     cc->gdb_stop_before_watchpoint = true;
 165
 166     /*
 167      * Reason: mips_cpu_initfn() calls cpu_exec_init(), which saves
 168      * the object in cpus -> dangling pointer after final
 169      * object_unref().
 170      */
 171     dc->cannot_destroy_with_object_finalize_yet = true;
 172 }
 173
 174 static const TypeInfo mips_cpu_type_info = {
 175     .name = TYPE_MIPS_CPU,
 176     .parent = TYPE_CPU,
 177     .instance_size = sizeof(MIPSCPU),
 178     .instance_init = mips_cpu_initfn,
 179     .abstract = false,
 180     .class_size = sizeof(MIPSCPUClass),
 181     .class_init = mips_cpu_class_init,
 182 };
 183
 184 static void mips_cpu_register_types(void)
 185 {
 186     type_register_static(&mips_cpu_type_info);
 187 }
 188
 189 type_init(mips_cpu_register_types)