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/module.h"
  35 #include "migration/vmstate.h"
  36
  37
  38 static void xtensa_cpu_set_pc(CPUState *cs, vaddr value)
  39 {
  40     XtensaCPU *cpu = XTENSA_CPU(cs);
  41
  42     cpu->env.pc = value;
  43 }
  44
  45 static bool xtensa_cpu_has_work(CPUState *cs)
  46 {
  47 #ifndef CONFIG_USER_ONLY
  48     XtensaCPU *cpu = XTENSA_CPU(cs);
  49
  50     return !cpu->env.runstall && cpu->env.pending_irq_level;
  51 #else
  52     return true;
  53 #endif
  54 }
  55
  56 #ifdef CONFIG_USER_ONLY
  57 static bool abi_call0;
  58
  59 void xtensa_set_abi_call0(void)
  60 {
  61     abi_call0 = true;
  62 }
  63
  64 bool xtensa_abi_call0(void)
  65 {
  66     return abi_call0;
  67 }
  68 #endif
  69
  70 /* CPUClass::reset() */
  71 static void xtensa_cpu_reset(CPUState *s)
  72 {
  73     XtensaCPU *cpu = XTENSA_CPU(s);
  74     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  75     CPUXtensaState *env = &cpu->env;
  76
  77     xcc->parent_reset(s);
  78
  79     env->exception_taken = 0;
  80     env->pc = env->config->exception_vector[EXC_RESET0 + env->static_vectors];
  81     env->sregs[LITBASE] &= ~1;
  82 #ifndef CONFIG_USER_ONLY
  83     env->sregs[PS] = xtensa_option_enabled(env->config,
  84             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
  85     env->pending_irq_level = 0;
  86 #else
  87     env->sregs[PS] = PS_UM | (3 << PS_RING_SHIFT);
  88     if (xtensa_option_enabled(env->config,
  89                               XTENSA_OPTION_WINDOWED_REGISTER) &&
  90         !xtensa_abi_call0()) {
  91         env->sregs[PS] |= PS_WOE;
  92     }
  93 #endif
  94     env->sregs[VECBASE] = env->config->vecbase;
  95     env->sregs[IBREAKENABLE] = 0;
  96     env->sregs[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask;
  97     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
  98             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
  99     env->sregs[CONFIGID0] = env->config->configid[0];
 100     env->sregs[CONFIGID1] = env->config->configid[1];
 101     env->exclusive_addr = -1;
 102
 103 #ifndef CONFIG_USER_ONLY
 104     reset_mmu(env);
 105     s->halted = env->runstall;
 106 #endif
 107 }
 108
 109 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
 110 {
 111     ObjectClass *oc;
 112     char *typename;
 113
 114     typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model);
 115     oc = object_class_by_name(typename);
 116     g_free(typename);
 117     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
 118         object_class_is_abstract(oc)) {
 119         return NULL;
 120     }
 121     return oc;
 122 }
 123
 124 static void xtensa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
 125 {
 126     XtensaCPU *cpu = XTENSA_CPU(cs);
 127
 128     info->private_data = cpu->env.config->isa;
 129     info->print_insn = print_insn_xtensa;
 130 }
 131
 132 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 133 {
 134     CPUState *cs = CPU(dev);
 135     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 136     Error *local_err = NULL;
 137
 138 #ifndef CONFIG_USER_ONLY
 139     xtensa_irq_init(&XTENSA_CPU(dev)->env);
 140 #endif
 141
 142     cpu_exec_realizefn(cs, &local_err);
 143     if (local_err != NULL) {
 144         error_propagate(errp, local_err);
 145         return;
 146     }
 147
 148     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 149
 150     qemu_init_vcpu(cs);
 151
 152     xcc->parent_realize(dev, errp);
 153 }
 154
 155 static void xtensa_cpu_initfn(Object *obj)
 156 {
 157     XtensaCPU *cpu = XTENSA_CPU(obj);
 158     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 159     CPUXtensaState *env = &cpu->env;
 160
 161     cpu_set_cpustate_pointers(cpu);
 162     env->config = xcc->config;
 163
 164 #ifndef CONFIG_USER_ONLY
 165     env->address_space_er = g_malloc(sizeof(*env->address_space_er));
 166     env->system_er = g_malloc(sizeof(*env->system_er));
 167     memory_region_init_io(env->system_er, obj, NULL, env, "er",
 168                           UINT64_C(0x100000000));
 169     address_space_init(env->address_space_er, env->system_er, "ER");
 170 #endif
 171 }
 172
 173 static const VMStateDescription vmstate_xtensa_cpu = {
 174     .name = "cpu",
 175     .unmigratable = 1,
 176 };
 177
 178 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 179 {
 180     DeviceClass *dc = DEVICE_CLASS(oc);
 181     CPUClass *cc = CPU_CLASS(oc);
 182     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 183
 184     device_class_set_parent_realize(dc, xtensa_cpu_realizefn,
 185                                     &xcc->parent_realize);
 186
 187     xcc->parent_reset = cc->reset;
 188     cc->reset = xtensa_cpu_reset;
 189
 190     cc->class_by_name = xtensa_cpu_class_by_name;
 191     cc->has_work = xtensa_cpu_has_work;
 192     cc->do_interrupt = xtensa_cpu_do_interrupt;
 193     cc->cpu_exec_interrupt = xtensa_cpu_exec_interrupt;
 194     cc->dump_state = xtensa_cpu_dump_state;
 195     cc->set_pc = xtensa_cpu_set_pc;
 196     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 197     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 198     cc->gdb_stop_before_watchpoint = true;
 199     cc->tlb_fill = xtensa_cpu_tlb_fill;
 200 #ifndef CONFIG_USER_ONLY
 201     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
 202     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;
 203     cc->do_transaction_failed = xtensa_cpu_do_transaction_failed;
 204 #endif
 205     cc->debug_excp_handler = xtensa_breakpoint_handler;
 206     cc->disas_set_info = xtensa_cpu_disas_set_info;
 207     cc->tcg_initialize = xtensa_translate_init;
 208     dc->vmsd = &vmstate_xtensa_cpu;
 209 }
 210
 211 static const TypeInfo xtensa_cpu_type_info = {
 212     .name = TYPE_XTENSA_CPU,
 213     .parent = TYPE_CPU,
 214     .instance_size = sizeof(XtensaCPU),
 215     .instance_init = xtensa_cpu_initfn,
 216     .abstract = true,
 217     .class_size = sizeof(XtensaCPUClass),
 218     .class_init = xtensa_cpu_class_init,
 219 };
 220
 221 static void xtensa_cpu_register_types(void)
 222 {
 223     type_register_static(&xtensa_cpu_type_info);
 224 }
 225
 226 type_init(xtensa_cpu_register_types)