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