target-xtensa/cpu.c

   1 /*
   2  * QEMU Xtensa CPU
   3  *
   4  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   5  * Copyright (c) 2012 SUSE LINUX Products GmbH
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above copyright
  13  *       notice, this list of conditions and the following disclaimer in the
  14  *       documentation and/or other materials provided with the distribution.
  15  *     * Neither the name of the Open Source and Linux Lab nor the
  16  *       names of its contributors may be used to endorse or promote products
  17  *       derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "cpu.h"
  32 #include "qemu-common.h"
  33
  34
  35 /* CPUClass::reset() */
  36 static void xtensa_cpu_reset(CPUState *s)
  37 {
  38     XtensaCPU *cpu = XTENSA_CPU(s);
  39     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  40     CPUXtensaState *env = &cpu->env;
  41
  42     xcc->parent_reset(s);
  43
  44     env->exception_taken = 0;
  45     env->pc = env->config->exception_vector[EXC_RESET];
  46     env->sregs[LITBASE] &= ~1;
  47     env->sregs[PS] = xtensa_option_enabled(env->config,
  48             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
  49     env->sregs[VECBASE] = env->config->vecbase;
  50     env->sregs[IBREAKENABLE] = 0;
  51
  52     env->pending_irq_level = 0;
  53     reset_mmu(env);
  54 }
  55
  56 static void xtensa_cpu_initfn(Object *obj)
  57 {
  58     XtensaCPU *cpu = XTENSA_CPU(obj);
  59     CPUXtensaState *env = &cpu->env;
  60
  61     cpu_exec_init(env);
  62 }
  63
  64 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
  65 {
  66     CPUClass *cc = CPU_CLASS(oc);
  67     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
  68
  69     xcc->parent_reset = cc->reset;
  70     cc->reset = xtensa_cpu_reset;
  71 }
  72
  73 static const TypeInfo xtensa_cpu_type_info = {
  74     .name = TYPE_XTENSA_CPU,
  75     .parent = TYPE_CPU,
  76     .instance_size = sizeof(XtensaCPU),
  77     .instance_init = xtensa_cpu_initfn,
  78     .abstract = false,
  79     .class_size = sizeof(XtensaCPUClass),
  80     .class_init = xtensa_cpu_class_init,
  81 };
  82
  83 static void xtensa_cpu_register_types(void)
  84 {
  85     type_register_static(&xtensa_cpu_type_info);
  86 }
  87
  88 type_init(xtensa_cpu_register_types)