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 static int xtensa_cpu_mmu_index(CPUState *cs, bool ifetch) 78 { 79 return xtensa_get_cring(cpu_env(cs)); 80 } 81 82 #ifdef CONFIG_USER_ONLY 83 static bool abi_call0; 84 85 void xtensa_set_abi_call0(void) 86 { 87 abi_call0 = true; 88 } 89 90 bool xtensa_abi_call0(void) 91 { 92 return abi_call0; 93 } 94 #endif 95 96 static void xtensa_cpu_reset_hold(Object *obj, ResetType type) 97 { 98 CPUState *cs = CPU(obj); 99 XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj); 100 CPUXtensaState *env = cpu_env(cs); 101 bool dfpu = xtensa_option_enabled(env->config, 102 XTENSA_OPTION_DFP_COPROCESSOR); 103 104 if (xcc->parent_phases.hold) { 105 xcc->parent_phases.hold(obj, type); 106 } 107 108 env->pc = env->config->exception_vector[EXC_RESET0 + env->static_vectors]; 109 env->sregs[LITBASE] &= ~1; 110 #ifndef CONFIG_USER_ONLY 111 env->sregs[PS] = xtensa_option_enabled(env->config, 112 XTENSA_OPTION_INTERRUPT) ? 0x1f : 0x10; 113 env->pending_irq_level = 0; 114 #else 115 env->sregs[PS] = PS_UM | (3 << PS_RING_SHIFT); 116 if (xtensa_option_enabled(env->config, 117 XTENSA_OPTION_WINDOWED_REGISTER) && 118 !xtensa_abi_call0()) { 119 env->sregs[PS] |= PS_WOE; 120 } 121 env->sregs[CPENABLE] = 0xff; 122 #endif 123 env->sregs[VECBASE] = env->config->vecbase; 124 env->sregs[IBREAKENABLE] = 0; 125 env->sregs[MEMCTL] = MEMCTL_IL0EN & env->config->memctl_mask; 126 env->sregs[ATOMCTL] = xtensa_option_enabled(env->config, 127 XTENSA_OPTION_ATOMCTL) ? 0x28 : 0x15; 128 env->sregs[CONFIGID0] = env->config->configid[0]; 129 env->sregs[CONFIGID1] = env->config->configid[1]; 130 env->exclusive_addr = -1; 131 132 #ifndef CONFIG_USER_ONLY 133 reset_mmu(env); 134 cs->halted = env->runstall; 135 #endif 136 /* For inf * 0 + NaN, return the input NaN */ 137 set_float_infzeronan_rule(float_infzeronan_dnan_never, &env->fp_status); 138 set_no_signaling_nans(!dfpu, &env->fp_status); 139 /* Default NaN value: sign bit clear, set frac msb */ 140 set_float_default_nan_pattern(0b01000000, &env->fp_status); 141 xtensa_use_first_nan(env, !dfpu); 142 } 143 144 static ObjectClass *xtensa_cpu_class_by_name(const char *cpu_model) 145 { 146 ObjectClass *oc; 147 char *typename; 148 149 typename = g_strdup_printf(XTENSA_CPU_TYPE_NAME("%s"), cpu_model); 150 oc = object_class_by_name(typename); 151 g_free(typename); 152 153 return oc; 154 } 155 156 static void xtensa_cpu_disas_set_info(CPUState *cs, disassemble_info *info) 157 { 158 XtensaCPU *cpu = XTENSA_CPU(cs); 159 160 info->private_data = cpu->env.config->isa; 161 info->print_insn = print_insn_xtensa; 162 } 163 164 static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp) 165 { 166 CPUState *cs = CPU(dev); 167 XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(dev); 168 Error *local_err = NULL; 169 170 #ifndef CONFIG_USER_ONLY 171 xtensa_irq_init(&XTENSA_CPU(dev)->env); 172 #endif 173 174 cpu_exec_realizefn(cs, &local_err); 175 if (local_err != NULL) { 176 error_propagate(errp, local_err); 177 return; 178 } 179 180 cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs; 181 182 qemu_init_vcpu(cs); 183 184 xcc->parent_realize(dev, errp); 185 } 186 187 static void xtensa_cpu_initfn(Object *obj) 188 { 189 XtensaCPU *cpu = XTENSA_CPU(obj); 190 XtensaCPUClass *xcc = XTENSA_CPU_GET_CLASS(obj); 191 CPUXtensaState *env = &cpu->env; 192 193 env->config = xcc->config; 194 195 #ifndef CONFIG_USER_ONLY 196 env->address_space_er = g_malloc(sizeof(*env->address_space_er)); 197 env->system_er = g_malloc(sizeof(*env->system_er)); 198 memory_region_init_io(env->system_er, obj, NULL, env, "er", 199 UINT64_C(0x100000000)); 200 address_space_init(env->address_space_er, env->system_er, "ER"); 201 202 cpu->clock = qdev_init_clock_in(DEVICE(obj), "clk-in", NULL, cpu, 0); 203 clock_set_hz(cpu->clock, env->config->clock_freq_khz * 1000); 204 #endif 205 } 206 207 XtensaCPU *xtensa_cpu_create_with_clock(const char *cpu_type, Clock *cpu_refclk) 208 { 209 DeviceState *cpu; 210 211 cpu = qdev_new(cpu_type); 212 qdev_connect_clock_in(cpu, "clk-in", cpu_refclk); 213 qdev_realize(cpu, NULL, &error_abort); 214 215 return XTENSA_CPU(cpu); 216 } 217 218 #ifndef CONFIG_USER_ONLY 219 static const VMStateDescription vmstate_xtensa_cpu = { 220 .name = "cpu", 221 .unmigratable = 1, 222 }; 223 224 #include "hw/core/sysemu-cpu-ops.h" 225 226 static const struct SysemuCPUOps xtensa_sysemu_ops = { 227 .get_phys_page_debug = xtensa_cpu_get_phys_page_debug, 228 }; 229 #endif 230 231 #include "hw/core/tcg-cpu-ops.h" 232 233 static const TCGCPUOps xtensa_tcg_ops = { 234 .initialize = xtensa_translate_init, 235 .translate_code = xtensa_translate_code, 236 .debug_excp_handler = xtensa_breakpoint_handler, 237 .restore_state_to_opc = xtensa_restore_state_to_opc, 238 239 #ifndef CONFIG_USER_ONLY 240 .tlb_fill = xtensa_cpu_tlb_fill, 241 .cpu_exec_interrupt = xtensa_cpu_exec_interrupt, 242 .cpu_exec_halt = xtensa_cpu_has_work, 243 .do_interrupt = xtensa_cpu_do_interrupt, 244 .do_transaction_failed = xtensa_cpu_do_transaction_failed, 245 .do_unaligned_access = xtensa_cpu_do_unaligned_access, 246 .debug_check_breakpoint = xtensa_debug_check_breakpoint, 247 #endif /* !CONFIG_USER_ONLY */ 248 }; 249 250 static void xtensa_cpu_class_init(ObjectClass *oc, void *data) 251 { 252 DeviceClass *dc = DEVICE_CLASS(oc); 253 CPUClass *cc = CPU_CLASS(oc); 254 XtensaCPUClass *xcc = XTENSA_CPU_CLASS(cc); 255 ResettableClass *rc = RESETTABLE_CLASS(oc); 256 257 device_class_set_parent_realize(dc, xtensa_cpu_realizefn, 258 &xcc->parent_realize); 259 260 resettable_class_set_parent_phases(rc, NULL, xtensa_cpu_reset_hold, NULL, 261 &xcc->parent_phases); 262 263 cc->class_by_name = xtensa_cpu_class_by_name; 264 cc->has_work = xtensa_cpu_has_work; 265 cc->mmu_index = xtensa_cpu_mmu_index; 266 cc->dump_state = xtensa_cpu_dump_state; 267 cc->set_pc = xtensa_cpu_set_pc; 268 cc->get_pc = xtensa_cpu_get_pc; 269 cc->gdb_read_register = xtensa_cpu_gdb_read_register; 270 cc->gdb_write_register = xtensa_cpu_gdb_write_register; 271 cc->gdb_stop_before_watchpoint = true; 272 #ifndef CONFIG_USER_ONLY 273 cc->sysemu_ops = &xtensa_sysemu_ops; 274 dc->vmsd = &vmstate_xtensa_cpu; 275 #endif 276 cc->disas_set_info = xtensa_cpu_disas_set_info; 277 cc->tcg_ops = &xtensa_tcg_ops; 278 } 279 280 static const TypeInfo xtensa_cpu_type_info = { 281 .name = TYPE_XTENSA_CPU, 282 .parent = TYPE_CPU, 283 .instance_size = sizeof(XtensaCPU), 284 .instance_align = __alignof(XtensaCPU), 285 .instance_init = xtensa_cpu_initfn, 286 .abstract = true, 287 .class_size = sizeof(XtensaCPUClass), 288 .class_init = xtensa_cpu_class_init, 289 }; 290 291 static void xtensa_cpu_register_types(void) 292 { 293 type_register_static(&xtensa_cpu_type_info); 294 } 295 296 type_init(xtensa_cpu_register_types) 297