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
  25
  26 /* CPUClass::reset() */
  27 static void superh_cpu_reset(CPUState *s)
  28 {
  29     SuperHCPU *cpu = SUPERH_CPU(s);
  30     SuperHCPUClass *scc = SUPERH_CPU_GET_CLASS(cpu);
  31     CPUSH4State *env = &cpu->env;
  32
  33     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
  34         qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
  35         log_cpu_state(env, 0);
  36     }
  37
  38     scc->parent_reset(s);
  39
  40     memset(env, 0, offsetof(CPUSH4State, breakpoints));
  41     tlb_flush(env, 1);
  42
  43     env->pc = 0xA0000000;
  44 #if defined(CONFIG_USER_ONLY)
  45     env->fpscr = FPSCR_PR; /* value for userspace according to the kernel */
  46     set_float_rounding_mode(float_round_nearest_even, &env->fp_status); /* ?! */
  47 #else
  48     env->sr = SR_MD | SR_RB | SR_BL | SR_I3 | SR_I2 | SR_I1 | SR_I0;
  49     env->fpscr = FPSCR_DN | FPSCR_RM_ZERO; /* CPU reset value according to SH4 manual */
  50     set_float_rounding_mode(float_round_to_zero, &env->fp_status);
  51     set_flush_to_zero(1, &env->fp_status);
  52 #endif
  53     set_default_nan_mode(1, &env->fp_status);
  54 }
  55
  56 static void superh_cpu_class_init(ObjectClass *oc, void *data)
  57 {
  58     CPUClass *cc = CPU_CLASS(oc);
  59     SuperHCPUClass *scc = SUPERH_CPU_CLASS(oc);
  60
  61     scc->parent_reset = cc->reset;
  62     cc->reset = superh_cpu_reset;
  63 }
  64
  65 static const TypeInfo superh_cpu_type_info = {
  66     .name = TYPE_SUPERH_CPU,
  67     .parent = TYPE_CPU,
  68     .instance_size = sizeof(SuperHCPU),
  69     .abstract = false,
  70     .class_size = sizeof(SuperHCPUClass),
  71     .class_init = superh_cpu_class_init,
  72 };
  73
  74 static void superh_cpu_register_types(void)
  75 {
  76     type_register_static(&superh_cpu_type_info);
  77 }
  78
  79 type_init(superh_cpu_register_types)