target-unicore32/cpu.c

   1 /*
   2  * QEMU UniCore32 CPU
   3  *
   4  * Copyright (c) 2010-2012 Guan Xuetao
   5  * Copyright (c) 2012 SUSE LINUX Products GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * Contributions from 2012-04-01 on are considered under GPL version 2,
  12  * or (at your option) any later version.
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "qapi/error.h"
  17 #include "cpu.h"
  18 #include "qemu-common.h"
  19 #include "migration/vmstate.h"
  20
  21 static void uc32_cpu_set_pc(CPUState *cs, vaddr value)
  22 {
  23     UniCore32CPU *cpu = UNICORE32_CPU(cs);
  24
  25     cpu->env.regs[31] = value;
  26 }
  27
  28 static bool uc32_cpu_has_work(CPUState *cs)
  29 {
  30     return cs->interrupt_request &
  31         (CPU_INTERRUPT_HARD | CPU_INTERRUPT_EXITTB);
  32 }
  33
  34 static inline void set_feature(CPUUniCore32State *env, int feature)
  35 {
  36     env->features |= feature;
  37 }
  38
  39 /* CPU models */
  40
  41 static ObjectClass *uc32_cpu_class_by_name(const char *cpu_model)
  42 {
  43     ObjectClass *oc;
  44     char *typename;
  45
  46     if (cpu_model == NULL) {
  47         return NULL;
  48     }
  49
  50     typename = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, cpu_model);
  51     oc = object_class_by_name(typename);
  52     g_free(typename);
  53     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_UNICORE32_CPU) ||
  54                        object_class_is_abstract(oc))) {
  55         oc = NULL;
  56     }
  57     return oc;
  58 }
  59
  60 typedef struct UniCore32CPUInfo {
  61     const char *name;
  62     void (*instance_init)(Object *obj);
  63 } UniCore32CPUInfo;
  64
  65 static void unicore_ii_cpu_initfn(Object *obj)
  66 {
  67     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  68     CPUUniCore32State *env = &cpu->env;
  69
  70     env->cp0.c0_cpuid = 0x4d000863;
  71     env->cp0.c0_cachetype = 0x0d152152;
  72     env->cp0.c1_sys = 0x2000;
  73     env->cp0.c2_base = 0x0;
  74     env->cp0.c3_faultstatus = 0x0;
  75     env->cp0.c4_faultaddr = 0x0;
  76     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  77
  78     set_feature(env, UC32_HWCAP_CMOV);
  79     set_feature(env, UC32_HWCAP_UCF64);
  80 }
  81
  82 static void uc32_any_cpu_initfn(Object *obj)
  83 {
  84     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  85     CPUUniCore32State *env = &cpu->env;
  86
  87     env->cp0.c0_cpuid = 0xffffffff;
  88     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  89
  90     set_feature(env, UC32_HWCAP_CMOV);
  91     set_feature(env, UC32_HWCAP_UCF64);
  92 }
  93
  94 static const UniCore32CPUInfo uc32_cpus[] = {
  95     { .name = "UniCore-II", .instance_init = unicore_ii_cpu_initfn },
  96     { .name = "any",        .instance_init = uc32_any_cpu_initfn },
  97 };
  98
  99 static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
 100 {
 101     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 102
 103     qemu_init_vcpu(CPU(dev));
 104
 105     ucc->parent_realize(dev, errp);
 106 }
 107
 108 static void uc32_cpu_initfn(Object *obj)
 109 {
 110     CPUState *cs = CPU(obj);
 111     UniCore32CPU *cpu = UNICORE32_CPU(obj);
 112     CPUUniCore32State *env = &cpu->env;
 113     static bool inited;
 114
 115     cs->env_ptr = env;
 116     cpu_exec_init(cs, &error_abort);
 117
 118 #ifdef CONFIG_USER_ONLY
 119     env->uncached_asr = ASR_MODE_USER;
 120     env->regs[31] = 0;
 121 #else
 122     env->uncached_asr = ASR_MODE_PRIV;
 123     env->regs[31] = 0x03000000;
 124 #endif
 125
 126     tlb_flush(cs, 1);
 127
 128     if (tcg_enabled() && !inited) {
 129         inited = true;
 130         uc32_translate_init();
 131     }
 132 }
 133
 134 static const VMStateDescription vmstate_uc32_cpu = {
 135     .name = "cpu",
 136     .unmigratable = 1,
 137 };
 138
 139 static void uc32_cpu_class_init(ObjectClass *oc, void *data)
 140 {
 141     DeviceClass *dc = DEVICE_CLASS(oc);
 142     CPUClass *cc = CPU_CLASS(oc);
 143     UniCore32CPUClass *ucc = UNICORE32_CPU_CLASS(oc);
 144
 145     ucc->parent_realize = dc->realize;
 146     dc->realize = uc32_cpu_realizefn;
 147
 148     cc->class_by_name = uc32_cpu_class_by_name;
 149     cc->has_work = uc32_cpu_has_work;
 150     cc->do_interrupt = uc32_cpu_do_interrupt;
 151     cc->cpu_exec_interrupt = uc32_cpu_exec_interrupt;
 152     cc->dump_state = uc32_cpu_dump_state;
 153     cc->set_pc = uc32_cpu_set_pc;
 154 #ifdef CONFIG_USER_ONLY
 155     cc->handle_mmu_fault = uc32_cpu_handle_mmu_fault;
 156 #else
 157     cc->get_phys_page_debug = uc32_cpu_get_phys_page_debug;
 158 #endif
 159     dc->vmsd = &vmstate_uc32_cpu;
 160
 161     /*
 162      * Reason: uc32_cpu_initfn() calls cpu_exec_init(), which saves
 163      * the object in cpus -> dangling pointer after final
 164      * object_unref().
 165      */
 166     dc->cannot_destroy_with_object_finalize_yet = true;
 167 }
 168
 169 static void uc32_register_cpu_type(const UniCore32CPUInfo *info)
 170 {
 171     TypeInfo type_info = {
 172         .parent = TYPE_UNICORE32_CPU,
 173         .instance_init = info->instance_init,
 174     };
 175
 176     type_info.name = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, info->name);
 177     type_register(&type_info);
 178     g_free((void *)type_info.name);
 179 }
 180
 181 static const TypeInfo uc32_cpu_type_info = {
 182     .name = TYPE_UNICORE32_CPU,
 183     .parent = TYPE_CPU,
 184     .instance_size = sizeof(UniCore32CPU),
 185     .instance_init = uc32_cpu_initfn,
 186     .abstract = true,
 187     .class_size = sizeof(UniCore32CPUClass),
 188     .class_init = uc32_cpu_class_init,
 189 };
 190
 191 static void uc32_cpu_register_types(void)
 192 {
 193     int i;
 194
 195     type_register_static(&uc32_cpu_type_info);
 196     for (i = 0; i < ARRAY_SIZE(uc32_cpus); i++) {
 197         uc32_register_cpu_type(&uc32_cpus[i]);
 198     }
 199 }
 200
 201 type_init(uc32_cpu_register_types)