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.runstall && 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_RESET0 + env->static_vectors];
  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[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask;
  70     env->sregs[CACHEATTR] = 0x22222222;
  71     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
  72             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
  73     env->sregs[CONFIGID0] = env->config->configid[0];
  74     env->sregs[CONFIGID1] = env->config->configid[1];
  75
  76     env->pending_irq_level = 0;
  77     reset_mmu(env);
  78     s->halted = env->runstall;
  79 }
  80
  81 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
  82 {
  83     ObjectClass *oc;
  84     char *typename;
  85
  86     if (cpu_model == NULL) {
  87         return NULL;
  88     }
  89
  90     typename = g_strdup_printf("%s-" TYPE_XTENSA_CPU, cpu_model);
  91     oc = object_class_by_name(typename);
  92     g_free(typename);
  93     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
  94         object_class_is_abstract(oc)) {
  95         return NULL;
  96     }
  97     return oc;
  98 }
  99
 100 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 101 {
 102     CPUState *cs = CPU(dev);
 103     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 104     Error *local_err = NULL;
 105
 106     cpu_exec_realizefn(cs, &local_err);
 107     if (local_err != NULL) {
 108         error_propagate(errp, local_err);
 109         return;
 110     }
 111
 112     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 113
 114     qemu_init_vcpu(cs);
 115
 116     xcc->parent_realize(dev, errp);
 117 }
 118
 119 static void xtensa_cpu_initfn(Object *obj)
 120 {
 121     CPUState *cs = CPU(obj);
 122     XtensaCPU *cpu = XTENSA_CPU(obj);
 123     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 124     CPUXtensaState *env = &cpu->env;
 125     static bool tcg_inited;
 126
 127     cs->env_ptr = env;
 128     env->config = xcc->config;
 129
 130     env->address_space_er = g_malloc(sizeof(*env->address_space_er));
 131     env->system_er = g_malloc(sizeof(*env->system_er));
 132     memory_region_init_io(env->system_er, NULL, NULL, env, "er",
 133                           UINT64_C(0x100000000));
 134     address_space_init(env->address_space_er, env->system_er, "ER");
 135
 136     if (tcg_enabled() && !tcg_inited) {
 137         tcg_inited = true;
 138         xtensa_translate_init();
 139     }
 140 }
 141
 142 static const VMStateDescription vmstate_xtensa_cpu = {
 143     .name = "cpu",
 144     .unmigratable = 1,
 145 };
 146
 147 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 148 {
 149     DeviceClass *dc = DEVICE_CLASS(oc);
 150     CPUClass *cc = CPU_CLASS(oc);
 151     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 152
 153     xcc->parent_realize = dc->realize;
 154     dc->realize = xtensa_cpu_realizefn;
 155
 156     xcc->parent_reset = cc->reset;
 157     cc->reset = xtensa_cpu_reset;
 158
 159     cc->class_by_name = xtensa_cpu_class_by_name;
 160     cc->has_work = xtensa_cpu_has_work;
 161     cc->do_interrupt = xtensa_cpu_do_interrupt;
 162     cc->cpu_exec_interrupt = xtensa_cpu_exec_interrupt;
 163     cc->dump_state = xtensa_cpu_dump_state;
 164     cc->set_pc = xtensa_cpu_set_pc;
 165     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 166     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 167     cc->gdb_stop_before_watchpoint = true;
 168 #ifndef CONFIG_USER_ONLY
 169     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
 170     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
 171     cc->do_unassigned_access = xtensa_cpu_do_unassigned_access;
 172 #endif
 173     cc->debug_excp_handler = xtensa_breakpoint_handler;
 174     dc->vmsd = &vmstate_xtensa_cpu;
 175 }
 176
 177 static const TypeInfo xtensa_cpu_type_info = {
 178     .name = TYPE_XTENSA_CPU,
 179     .parent = TYPE_CPU,
 180     .instance_size = sizeof(XtensaCPU),
 181     .instance_init = xtensa_cpu_initfn,
 182     .abstract = true,
 183     .class_size = sizeof(XtensaCPUClass),
 184     .class_init = xtensa_cpu_class_init,
 185 };
 186
 187 static void xtensa_cpu_register_types(void)
 188 {
 189     type_register_static(&xtensa_cpu_type_info);
 190 }
 191
 192 type_init(xtensa_cpu_register_types)