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 #include "migration/vmstate.h"
  34
  35
  36 /* CPUClass::reset() */
  37 static void xtensa_cpu_reset(CPUState *s)
  38 {
  39     XtensaCPU *cpu = XTENSA_CPU(s);
  40     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  41     CPUXtensaState *env = &cpu->env;
  42
  43     xcc->parent_reset(s);
  44
  45     env->exception_taken = 0;
  46     env->pc = env->config->exception_vector[EXC_RESET];
  47     env->sregs[LITBASE] &= ~1;
  48     env->sregs[PS] = xtensa_option_enabled(env->config,
  49             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
  50     env->sregs[VECBASE] = env->config->vecbase;
  51     env->sregs[IBREAKENABLE] = 0;
  52     env->sregs[CACHEATTR] = 0x22222222;
  53     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
  54             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
  55
  56     env->pending_irq_level = 0;
  57     reset_mmu(env);
  58 }
  59
  60 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
  61 {
  62     XtensaCPU *cpu = XTENSA_CPU(dev);
  63     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
  64
  65     qemu_init_vcpu(&cpu->env);
  66
  67     xcc->parent_realize(dev, errp);
  68 }
  69
  70 static void xtensa_cpu_initfn(Object *obj)
  71 {
  72     CPUState *cs = CPU(obj);
  73     XtensaCPU *cpu = XTENSA_CPU(obj);
  74     CPUXtensaState *env = &cpu->env;
  75     static bool tcg_inited;
  76
  77     cs->env_ptr = env;
  78     cpu_exec_init(env);
  79
  80     if (tcg_enabled() && !tcg_inited) {
  81         tcg_inited = true;
  82         xtensa_translate_init();
  83         cpu_set_debug_excp_handler(xtensa_breakpoint_handler);
  84     }
  85 }
  86
  87 static const VMStateDescription vmstate_xtensa_cpu = {
  88     .name = "cpu",
  89     .unmigratable = 1,
  90 };
  91
  92 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
  93 {
  94     DeviceClass *dc = DEVICE_CLASS(oc);
  95     CPUClass *cc = CPU_CLASS(oc);
  96     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
  97
  98     xcc->parent_realize = dc->realize;
  99     dc->realize = xtensa_cpu_realizefn;
 100
 101     xcc->parent_reset = cc->reset;
 102     cc->reset = xtensa_cpu_reset;
 103
 104     dc->vmsd = &vmstate_xtensa_cpu;
 105 }
 106
 107 static const TypeInfo xtensa_cpu_type_info = {
 108     .name = TYPE_XTENSA_CPU,
 109     .parent = TYPE_CPU,
 110     .instance_size = sizeof(XtensaCPU),
 111     .instance_init = xtensa_cpu_initfn,
 112     .abstract = false,
 113     .class_size = sizeof(XtensaCPUClass),
 114     .class_init = xtensa_cpu_class_init,
 115 };
 116
 117 static void xtensa_cpu_register_types(void)
 118 {
 119     type_register_static(&xtensa_cpu_type_info);
 120 }
 121
 122 type_init(xtensa_cpu_register_types)