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 #include "exec/exec-all.h"
  21
  22 static void uc32_cpu_set_pc(CPUState *cs, vaddr value)
  23 {
  24     UniCore32CPU *cpu = UNICORE32_CPU(cs);
  25
  26     cpu->env.regs[31] = value;
  27 }
  28
  29 static bool uc32_cpu_has_work(CPUState *cs)
  30 {
  31     return cs->interrupt_request &
  32         (CPU_INTERRUPT_HARD | CPU_INTERRUPT_EXITTB);
  33 }
  34
  35 static inline void set_feature(CPUUniCore32State *env, int feature)
  36 {
  37     env->features |= feature;
  38 }
  39
  40 /* CPU models */
  41
  42 static ObjectClass *uc32_cpu_class_by_name(const char *cpu_model)
  43 {
  44     ObjectClass *oc;
  45     char *typename;
  46
  47     if (cpu_model == NULL) {
  48         return NULL;
  49     }
  50
  51     typename = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, cpu_model);
  52     oc = object_class_by_name(typename);
  53     g_free(typename);
  54     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_UNICORE32_CPU) ||
  55                        object_class_is_abstract(oc))) {
  56         oc = NULL;
  57     }
  58     return oc;
  59 }
  60
  61 typedef struct UniCore32CPUInfo {
  62     const char *name;
  63     void (*instance_init)(Object *obj);
  64 } UniCore32CPUInfo;
  65
  66 static void unicore_ii_cpu_initfn(Object *obj)
  67 {
  68     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  69     CPUUniCore32State *env = &cpu->env;
  70
  71     env->cp0.c0_cpuid = 0x4d000863;
  72     env->cp0.c0_cachetype = 0x0d152152;
  73     env->cp0.c1_sys = 0x2000;
  74     env->cp0.c2_base = 0x0;
  75     env->cp0.c3_faultstatus = 0x0;
  76     env->cp0.c4_faultaddr = 0x0;
  77     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  78
  79     set_feature(env, UC32_HWCAP_CMOV);
  80     set_feature(env, UC32_HWCAP_UCF64);
  81     set_snan_bit_is_one(1, &env->ucf64.fp_status);
  82 }
  83
  84 static void uc32_any_cpu_initfn(Object *obj)
  85 {
  86     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  87     CPUUniCore32State *env = &cpu->env;
  88
  89     env->cp0.c0_cpuid = 0xffffffff;
  90     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  91
  92     set_feature(env, UC32_HWCAP_CMOV);
  93     set_feature(env, UC32_HWCAP_UCF64);
  94     set_snan_bit_is_one(1, &env->ucf64.fp_status);
  95 }
  96
  97 static const UniCore32CPUInfo uc32_cpus[] = {
  98     { .name = "UniCore-II", .instance_init = unicore_ii_cpu_initfn },
  99     { .name = "any",        .instance_init = uc32_any_cpu_initfn },
 100 };
 101
 102 static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
 103 {
 104     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 105
 106     qemu_init_vcpu(CPU(dev));
 107
 108     ucc->parent_realize(dev, errp);
 109 }
 110
 111 static void uc32_cpu_initfn(Object *obj)
 112 {
 113     CPUState *cs = CPU(obj);
 114     UniCore32CPU *cpu = UNICORE32_CPU(obj);
 115     CPUUniCore32State *env = &cpu->env;
 116     static bool inited;
 117
 118     cs->env_ptr = env;
 119     cpu_exec_init(cs, &error_abort);
 120
 121 #ifdef CONFIG_USER_ONLY
 122     env->uncached_asr = ASR_MODE_USER;
 123     env->regs[31] = 0;
 124 #else
 125     env->uncached_asr = ASR_MODE_PRIV;
 126     env->regs[31] = 0x03000000;
 127 #endif
 128
 129     tlb_flush(cs, 1);
 130
 131     if (tcg_enabled() && !inited) {
 132         inited = true;
 133         uc32_translate_init();
 134     }
 135 }
 136
 137 static const VMStateDescription vmstate_uc32_cpu = {
 138     .name = "cpu",
 139     .unmigratable = 1,
 140 };
 141
 142 static void uc32_cpu_class_init(ObjectClass *oc, void *data)
 143 {
 144     DeviceClass *dc = DEVICE_CLASS(oc);
 145     CPUClass *cc = CPU_CLASS(oc);
 146     UniCore32CPUClass *ucc = UNICORE32_CPU_CLASS(oc);
 147
 148     ucc->parent_realize = dc->realize;
 149     dc->realize = uc32_cpu_realizefn;
 150
 151     cc->class_by_name = uc32_cpu_class_by_name;
 152     cc->has_work = uc32_cpu_has_work;
 153     cc->do_interrupt = uc32_cpu_do_interrupt;
 154     cc->cpu_exec_interrupt = uc32_cpu_exec_interrupt;
 155     cc->dump_state = uc32_cpu_dump_state;
 156     cc->set_pc = uc32_cpu_set_pc;
 157 #ifdef CONFIG_USER_ONLY
 158     cc->handle_mmu_fault = uc32_cpu_handle_mmu_fault;
 159 #else
 160     cc->get_phys_page_debug = uc32_cpu_get_phys_page_debug;
 161 #endif
 162     dc->vmsd = &vmstate_uc32_cpu;
 163
 164     /*
 165      * Reason: uc32_cpu_initfn() calls cpu_exec_init(), which saves
 166      * the object in cpus -> dangling pointer after final
 167      * object_unref().
 168      */
 169     dc->cannot_destroy_with_object_finalize_yet = true;
 170 }
 171
 172 static void uc32_register_cpu_type(const UniCore32CPUInfo *info)
 173 {
 174     TypeInfo type_info = {
 175         .parent = TYPE_UNICORE32_CPU,
 176         .instance_init = info->instance_init,
 177     };
 178
 179     type_info.name = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, info->name);
 180     type_register(&type_info);
 181     g_free((void *)type_info.name);
 182 }
 183
 184 static const TypeInfo uc32_cpu_type_info = {
 185     .name = TYPE_UNICORE32_CPU,
 186     .parent = TYPE_CPU,
 187     .instance_size = sizeof(UniCore32CPU),
 188     .instance_init = uc32_cpu_initfn,
 189     .abstract = true,
 190     .class_size = sizeof(UniCore32CPUClass),
 191     .class_init = uc32_cpu_class_init,
 192 };
 193
 194 static void uc32_cpu_register_types(void)
 195 {
 196     int i;
 197
 198     type_register_static(&uc32_cpu_type_info);
 199     for (i = 0; i < ARRAY_SIZE(uc32_cpus); i++) {
 200         uc32_register_cpu_type(&uc32_cpus[i]);
 201     }
 202 }
 203
 204 type_init(uc32_cpu_register_types)