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 "qemu/osdep.h"
  32 #include "qapi/error.h"
  33 #include "cpu.h"
  34 #include "qemu-common.h"
  35 #include "migration/vmstate.h"
  36 #include "exec/exec-all.h"
  37
  38
  39 static void xtensa_cpu_set_pc(CPUState *cs, vaddr value)
  40 {
  41     XtensaCPU *cpu = XTENSA_CPU(cs);
  42
  43     cpu->env.pc = value;
  44 }
  45
  46 static bool xtensa_cpu_has_work(CPUState *cs)
  47 {
  48     XtensaCPU *cpu = XTENSA_CPU(cs);
  49
  50     return cpu->env.pending_irq_level;
  51 }
  52
  53 /* CPUClass::reset() */
  54 static void xtensa_cpu_reset(CPUState *s)
  55 {
  56     XtensaCPU *cpu = XTENSA_CPU(s);
  57     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  58     CPUXtensaState *env = &cpu->env;
  59
  60     xcc->parent_reset(s);
  61
  62     env->exception_taken = 0;
  63     env->pc = env->config->exception_vector[EXC_RESET];
  64     env->sregs[LITBASE] &= ~1;
  65     env->sregs[PS] = xtensa_option_enabled(env->config,
  66             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
  67     env->sregs[VECBASE] = env->config->vecbase;
  68     env->sregs[IBREAKENABLE] = 0;
  69     env->sregs[CACHEATTR] = 0x22222222;
  70     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
  71             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
  72     env->sregs[CONFIGID0] = env->config->configid[0];
  73     env->sregs[CONFIGID1] = env->config->configid[1];
  74
  75     env->pending_irq_level = 0;
  76     reset_mmu(env);
  77 }
  78
  79 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
  80 {
  81     ObjectClass *oc;
  82     char *typename;
  83
  84     if (cpu_model == NULL) {
  85         return NULL;
  86     }
  87
  88     typename = g_strdup_printf("%s-" TYPE_XTENSA_CPU, cpu_model);
  89     oc = object_class_by_name(typename);
  90     g_free(typename);
  91     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
  92         object_class_is_abstract(oc)) {
  93         return NULL;
  94     }
  95     return oc;
  96 }
  97
  98 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
  99 {
 100     CPUState *cs = CPU(dev);
 101     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 102
 103     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 104
 105     qemu_init_vcpu(cs);
 106
 107     xcc->parent_realize(dev, errp);
 108 }
 109
 110 static void xtensa_cpu_initfn(Object *obj)
 111 {
 112     CPUState *cs = CPU(obj);
 113     XtensaCPU *cpu = XTENSA_CPU(obj);
 114     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 115     CPUXtensaState *env = &cpu->env;
 116     static bool tcg_inited;
 117
 118     cs->env_ptr = env;
 119     env->config = xcc->config;
 120     cpu_exec_init(cs, &error_abort);
 121
 122     if (tcg_enabled() && !tcg_inited) {
 123         tcg_inited = true;
 124         xtensa_translate_init();
 125     }
 126 }
 127
 128 static const VMStateDescription vmstate_xtensa_cpu = {
 129     .name = "cpu",
 130     .unmigratable = 1,
 131 };
 132
 133 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 134 {
 135     DeviceClass *dc = DEVICE_CLASS(oc);
 136     CPUClass *cc = CPU_CLASS(oc);
 137     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 138
 139     xcc->parent_realize = dc->realize;
 140     dc->realize = xtensa_cpu_realizefn;
 141
 142     xcc->parent_reset = cc->reset;
 143     cc->reset = xtensa_cpu_reset;
 144
 145     cc->class_by_name = xtensa_cpu_class_by_name;
 146     cc->has_work = xtensa_cpu_has_work;
 147     cc->do_interrupt = xtensa_cpu_do_interrupt;
 148     cc->cpu_exec_interrupt = xtensa_cpu_exec_interrupt;
 149     cc->dump_state = xtensa_cpu_dump_state;
 150     cc->set_pc = xtensa_cpu_set_pc;
 151     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 152     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 153     cc->gdb_stop_before_watchpoint = true;
 154 #ifndef CONFIG_USER_ONLY
 155     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
 156     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
 157     cc->do_unassigned_access = xtensa_cpu_do_unassigned_access;
 158 #endif
 159     cc->debug_excp_handler = xtensa_breakpoint_handler;
 160     dc->vmsd = &vmstate_xtensa_cpu;
 161
 162     /*
 163      * Reason: xtensa_cpu_initfn() calls cpu_exec_init(), which saves
 164      * the object in cpus -> dangling pointer after final
 165      * object_unref().
 166      */
 167     dc->cannot_destroy_with_object_finalize_yet = true;
 168 }
 169
 170 static const TypeInfo xtensa_cpu_type_info = {
 171     .name = TYPE_XTENSA_CPU,
 172     .parent = TYPE_CPU,
 173     .instance_size = sizeof(XtensaCPU),
 174     .instance_init = xtensa_cpu_initfn,
 175     .abstract = true,
 176     .class_size = sizeof(XtensaCPUClass),
 177     .class_init = xtensa_cpu_class_init,
 178 };
 179
 180 static void xtensa_cpu_register_types(void)
 181 {
 182     type_register_static(&xtensa_cpu_type_info);
 183 }
 184
 185 type_init(xtensa_cpu_register_types)