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 "fpu/softfloat.h"
  35 #include "qemu/module.h"
  36 #include "migration/vmstate.h"
  37 #include "hw/qdev-clock.h"
  38 #ifndef CONFIG_USER_ONLY
  39 #include "exec/memory.h"
  40 #endif
  41
  42
  43 static void xtensa_cpu_set_pc(CPUState *cs, vaddr value)
  44 {
  45     XtensaCPU *cpu = XTENSA_CPU(cs);
  46
  47     cpu->env.pc = value;
  48 }
  49
  50 static vaddr xtensa_cpu_get_pc(CPUState *cs)
  51 {
  52     XtensaCPU *cpu = XTENSA_CPU(cs);
  53
  54     return cpu->env.pc;
  55 }
  56
  57 static void xtensa_restore_state_to_opc(CPUState *cs,
  58                                         const TranslationBlock *tb,
  59                                         const uint64_t *data)
  60 {
  61     XtensaCPU *cpu = XTENSA_CPU(cs);
  62
  63     cpu->env.pc = data[0];
  64 }
  65
  66 static bool xtensa_cpu_has_work(CPUState *cs)
  67 {
  68 #ifndef CONFIG_USER_ONLY
  69     XtensaCPU *cpu = XTENSA_CPU(cs);
  70
  71     return !cpu->env.runstall && cpu->env.pending_irq_level;
  72 #else
  73     return true;
  74 #endif
  75 }
  76
  77 #ifdef CONFIG_USER_ONLY
  78 static bool abi_call0;
  79
  80 void xtensa_set_abi_call0(void)
  81 {
  82     abi_call0 = true;
  83 }
  84
  85 bool xtensa_abi_call0(void)
  86 {
  87     return abi_call0;
  88 }
  89 #endif
  90
  91 static void xtensa_cpu_reset_hold(Object *obj)
  92 {
  93     CPUState *s = CPU(obj);
  94     XtensaCPU *cpu = XTENSA_CPU(s);
  95     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(cpu);
  96     CPUXtensaState *env = &cpu->env;
  97     bool dfpu = xtensa_option_enabled(env->config,
  98                                       XTENSA_OPTION_DFP_COPROCESSOR);
  99
 100     if (xcc->parent_phases.hold) {
 101         xcc->parent_phases.hold(obj);
 102     }
 103
 104     env->pc = env->config->exception_vector[EXC_RESET0 + env->static_vectors];
 105     env->sregs[LITBASE] &= ~1;
 106 #ifndef CONFIG_USER_ONLY
 107     env->sregs[PS] = xtensa_option_enabled(env->config,
 108             XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10;
 109     env->pending_irq_level = 0;
 110 #else
 111     env->sregs[PS] = PS_UM | (3 << PS_RING_SHIFT);
 112     if (xtensa_option_enabled(env->config,
 113                               XTENSA_OPTION_WINDOWED_REGISTER) &&
 114         !xtensa_abi_call0()) {
 115         env->sregs[PS] |= PS_WOE;
 116     }
 117     env->sregs[CPENABLE] = 0xff;
 118 #endif
 119     env->sregs[VECBASE] = env->config->vecbase;
 120     env->sregs[IBREAKENABLE] = 0;
 121     env->sregs[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask;
 122     env->sregs[ATOMCTL] = xtensa_option_enabled(env->config,
 123             XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15;
 124     env->sregs[CONFIGID0] = env->config->configid[0];
 125     env->sregs[CONFIGID1] = env->config->configid[1];
 126     env->exclusive_addr = -1;
 127
 128 #ifndef CONFIG_USER_ONLY
 129     reset_mmu(env);
 130     s->halted = env->runstall;
 131 #endif
 132     set_no_signaling_nans(!dfpu, &env->fp_status);
 133     set_use_first_nan(!dfpu, &env->fp_status);
 134 }
 135
 136 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model)
 137 {
 138     ObjectClass *oc;
 139     char *typename;
 140
 141     typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model);
 142     oc = object_class_by_name(typename);
 143     g_free(typename);
 144     if (oc == NULL || !object_class_dynamic_cast(oc, TYPE_XTENSA_CPU) ||
 145         object_class_is_abstract(oc)) {
 146         return NULL;
 147     }
 148     return oc;
 149 }
 150
 151 static void xtensa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
 152 {
 153     XtensaCPU *cpu = XTENSA_CPU(cs);
 154
 155     info->private_data = cpu->env.config->isa;
 156     info->print_insn = print_insn_xtensa;
 157 }
 158
 159 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 160 {
 161     CPUState *cs = CPU(dev);
 162     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev);
 163     Error *local_err = NULL;
 164
 165 #ifndef CONFIG_USER_ONLY
 166     xtensa_irq_init(&XTENSA_CPU(dev)->env);
 167 #endif
 168
 169     cpu_exec_realizefn(cs, &local_err);
 170     if (local_err != NULL) {
 171         error_propagate(errp, local_err);
 172         return;
 173     }
 174
 175     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 176
 177     qemu_init_vcpu(cs);
 178
 179     xcc->parent_realize(dev, errp);
 180 }
 181
 182 static void xtensa_cpu_initfn(Object *obj)
 183 {
 184     XtensaCPU *cpu = XTENSA_CPU(obj);
 185     XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj);
 186     CPUXtensaState *env = &cpu->env;
 187
 188     cpu_set_cpustate_pointers(cpu);
 189     env->config = xcc->config;
 190
 191 #ifndef CONFIG_USER_ONLY
 192     env->address_space_er = g_malloc(sizeof(*env->address_space_er));
 193     env->system_er = g_malloc(sizeof(*env->system_er));
 194     memory_region_init_io(env->system_er, obj, NULL, env, "er",
 195                           UINT64_C(0x100000000));
 196     address_space_init(env->address_space_er, env->system_er, "ER");
 197
 198     cpu->clock = qdev_init_clock_in(DEVICE(obj), "clk-in", NULL, cpu, 0);
 199     clock_set_hz(cpu->clock, env->config->clock_freq_khz * 1000);
 200 #endif
 201 }
 202
 203 XtensaCPU *xtensa_cpu_create_with_clock(const char *cpu_type, Clock *cpu_refclk)
 204 {
 205     DeviceState *cpu;
 206
 207     cpu = DEVICE(object_new(cpu_type));
 208     qdev_connect_clock_in(cpu, "clk-in", cpu_refclk);
 209     qdev_realize(cpu, NULL, &error_abort);
 210
 211     return XTENSA_CPU(cpu);
 212 }
 213
 214 #ifndef CONFIG_USER_ONLY
 215 static const VMStateDescription vmstate_xtensa_cpu = {
 216     .name = "cpu",
 217     .unmigratable = 1,
 218 };
 219
 220 #include "hw/core/sysemu-cpu-ops.h"
 221
 222 static const struct SysemuCPUOps xtensa_sysemu_ops = {
 223     .get_phys_page_debug = xtensa_cpu_get_phys_page_debug,
 224 };
 225 #endif
 226
 227 #include "hw/core/tcg-cpu-ops.h"
 228
 229 static const struct TCGCPUOps xtensa_tcg_ops = {
 230     .initialize = xtensa_translate_init,
 231     .debug_excp_handler = xtensa_breakpoint_handler,
 232     .restore_state_to_opc = xtensa_restore_state_to_opc,
 233
 234 #ifndef CONFIG_USER_ONLY
 235     .tlb_fill = xtensa_cpu_tlb_fill,
 236     .cpu_exec_interrupt = xtensa_cpu_exec_interrupt,
 237     .do_interrupt = xtensa_cpu_do_interrupt,
 238     .do_transaction_failed = xtensa_cpu_do_transaction_failed,
 239     .do_unaligned_access = xtensa_cpu_do_unaligned_access,
 240 #endif /* !CONFIG_USER_ONLY */
 241 };
 242
 243 static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
 244 {
 245     DeviceClass *dc = DEVICE_CLASS(oc);
 246     CPUClass *cc = CPU_CLASS(oc);
 247     XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc);
 248     ResettableClass *rc = RESETTABLE_CLASS(oc);
 249
 250     device_class_set_parent_realize(dc, xtensa_cpu_realizefn,
 251                                     &xcc->parent_realize);
 252
 253     resettable_class_set_parent_phases(rc, NULL, xtensa_cpu_reset_hold, NULL,
 254                                        &xcc->parent_phases);
 255
 256     cc->class_by_name = xtensa_cpu_class_by_name;
 257     cc->has_work = xtensa_cpu_has_work;
 258     cc->dump_state = xtensa_cpu_dump_state;
 259     cc->set_pc = xtensa_cpu_set_pc;
 260     cc->get_pc = xtensa_cpu_get_pc;
 261     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
 262     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
 263     cc->gdb_stop_before_watchpoint = true;
 264 #ifndef CONFIG_USER_ONLY
 265     cc->sysemu_ops = &xtensa_sysemu_ops;
 266     dc->vmsd = &vmstate_xtensa_cpu;
 267 #endif
 268     cc->disas_set_info = xtensa_cpu_disas_set_info;
 269     cc->tcg_ops = &xtensa_tcg_ops;
 270 }
 271
 272 static const TypeInfo xtensa_cpu_type_info = {
 273     .name = TYPE_XTENSA_CPU,
 274     .parent = TYPE_CPU,
 275     .instance_size = sizeof(XtensaCPU),
 276     .instance_init = xtensa_cpu_initfn,
 277     .abstract = true,
 278     .class_size = sizeof(XtensaCPUClass),
 279     .class_init = xtensa_cpu_class_init,
 280 };
 281
 282 static void xtensa_cpu_register_types(void)
 283 {
 284     type_register_static(&xtensa_cpu_type_info);
 285 }
 286
 287 type_init(xtensa_cpu_register_types)