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