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