target-sh4/cpu.c

   1 /*
   2  * QEMU SuperH CPU
   3  *
   4  * Copyright (c) 2005 Samuel Tardieu
   5  * Copyright (c) 2012 SUSE LINUX Products GmbH
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see
  19  * <http://www.gnu.org/licenses/lgpl-2.1.html>
  20  */
  21
  22 #include "cpu.h"
  23 #include "qemu-common.h"
  24 #include "migration/vmstate.h"
  25
  26
  27 /* CPUClass::reset() */
  28 static void superh_cpu_reset(CPUState *s)
  29 {
  30     SuperHCPU *cpu = SUPERH_CPU(s);
  31     SuperHCPUClass *scc = SUPERH_CPU_GET_CLASS(cpu);
  32     CPUSH4State *env = &cpu->env;
  33
  34     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  35         qemu_log("CPU Reset (CPU %d)\n", s->cpu_index);
  36         log_cpu_state(env, 0);
  37     }
  38
  39     scc->parent_reset(s);
  40
  41     memset(env, 0, offsetof(CPUSH4State, breakpoints));
  42     tlb_flush(env, 1);
  43
  44     env->pc = 0xA0000000;
  45 #if defined(CONFIG_USER_ONLY)
  46     env->fpscr = FPSCR_PR; /* value for userspace according to the kernel */
  47     set_float_rounding_mode(float_round_nearest_even, &env->fp_status); /* ?! */
  48 #else
  49     env->sr = SR_MD | SR_RB | SR_BL | SR_I3 | SR_I2 | SR_I1 | SR_I0;
  50     env->fpscr = FPSCR_DN | FPSCR_RM_ZERO; /* CPU reset value according to SH4 manual */
  51     set_float_rounding_mode(float_round_to_zero, &env->fp_status);
  52     set_flush_to_zero(1, &env->fp_status);
  53 #endif
  54     set_default_nan_mode(1, &env->fp_status);
  55 }
  56
  57 static void superh_cpu_initfn(Object *obj)
  58 {
  59     SuperHCPU *cpu = SUPERH_CPU(obj);
  60     CPUSH4State *env = &cpu->env;
  61
  62     cpu_exec_init(env);
  63
  64     env->movcal_backup_tail = &(env->movcal_backup);
  65 }
  66
  67 static const VMStateDescription vmstate_sh_cpu = {
  68     .name = "cpu",
  69     .unmigratable = 1,
  70 };
  71
  72 static void superh_cpu_class_init(ObjectClass *oc, void *data)
  73 {
  74     DeviceClass *dc = DEVICE_CLASS(oc);
  75     CPUClass *cc = CPU_CLASS(oc);
  76     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
  77
  78     scc->parent_reset = cc->reset;
  79     cc->reset = superh_cpu_reset;
  80
  81     dc->vmsd = &vmstate_sh_cpu;
  82 }
  83
  84 static const TypeInfo superh_cpu_type_info = {
  85     .name = TYPE_SUPERH_CPU,
  86     .parent = TYPE_CPU,
  87     .instance_size = sizeof(SuperHCPU),
  88     .instance_init = superh_cpu_initfn,
  89     .abstract = false,
  90     .class_size = sizeof(SuperHCPUClass),
  91     .class_init = superh_cpu_class_init,
  92 };
  93
  94 static void superh_cpu_register_types(void)
  95 {
  96     type_register_static(&superh_cpu_type_info);
  97 }
  98
  99 type_init(superh_cpu_register_types)