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 }
  82
  83 static void uc32_any_cpu_initfn(Object *obj)
  84 {
  85     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  86     CPUUniCore32State *env = &cpu->env;
  87
  88     env->cp0.c0_cpuid = 0xffffffff;
  89     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  90
  91     set_feature(env, UC32_HWCAP_CMOV);
  92     set_feature(env, UC32_HWCAP_UCF64);
  93 }
  94
  95 static const UniCore32CPUInfo uc32_cpus[] = {
  96     { .name = "UniCore-II", .instance_init = unicore_ii_cpu_initfn },
  97     { .name = "any",        .instance_init = uc32_any_cpu_initfn },
  98 };
  99
 100 static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
 101 {
 102     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 103
 104     qemu_init_vcpu(CPU(dev));
 105
 106     ucc->parent_realize(dev, errp);
 107 }
 108
 109 static void uc32_cpu_initfn(Object *obj)
 110 {
 111     CPUState *cs = CPU(obj);
 112     UniCore32CPU *cpu = UNICORE32_CPU(obj);
 113     CPUUniCore32State *env = &cpu->env;
 114     static bool inited;
 115
 116     cs->env_ptr = env;
 117     cpu_exec_init(cs, &error_abort);
 118
 119 #ifdef CONFIG_USER_ONLY
 120     env->uncached_asr = ASR_MODE_USER;
 121     env->regs[31] = 0;
 122 #else
 123     env->uncached_asr = ASR_MODE_PRIV;
 124     env->regs[31] = 0x03000000;
 125 #endif
 126
 127     tlb_flush(cs, 1);
 128
 129     if (tcg_enabled() && !inited) {
 130         inited = true;
 131         uc32_translate_init();
 132     }
 133 }
 134
 135 static const VMStateDescription vmstate_uc32_cpu = {
 136     .name = "cpu",
 137     .unmigratable = 1,
 138 };
 139
 140 static void uc32_cpu_class_init(ObjectClass *oc, void *data)
 141 {
 142     DeviceClass *dc = DEVICE_CLASS(oc);
 143     CPUClass *cc = CPU_CLASS(oc);
 144     UniCore32CPUClass *ucc = UNICORE32_CPU_CLASS(oc);
 145
 146     ucc->parent_realize = dc->realize;
 147     dc->realize = uc32_cpu_realizefn;
 148
 149     cc->class_by_name = uc32_cpu_class_by_name;
 150     cc->has_work = uc32_cpu_has_work;
 151     cc->do_interrupt = uc32_cpu_do_interrupt;
 152     cc->cpu_exec_interrupt = uc32_cpu_exec_interrupt;
 153     cc->dump_state = uc32_cpu_dump_state;
 154     cc->set_pc = uc32_cpu_set_pc;
 155 #ifdef CONFIG_USER_ONLY
 156     cc->handle_mmu_fault = uc32_cpu_handle_mmu_fault;
 157 #else
 158     cc->get_phys_page_debug = uc32_cpu_get_phys_page_debug;
 159 #endif
 160     dc->vmsd = &vmstate_uc32_cpu;
 161
 162     /*
 163      * Reason: uc32_cpu_initfn() calls cpu_exec_init(), which saves
 164      * the object in cpus -> dangling pointer after final
 165      * object_unref().
 166      */
 167     dc->cannot_destroy_with_object_finalize_yet = true;
 168 }
 169
 170 static void uc32_register_cpu_type(const UniCore32CPUInfo *info)
 171 {
 172     TypeInfo type_info = {
 173         .parent = TYPE_UNICORE32_CPU,
 174         .instance_init = info->instance_init,
 175     };
 176
 177     type_info.name = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, info->name);
 178     type_register(&type_info);
 179     g_free((void *)type_info.name);
 180 }
 181
 182 static const TypeInfo uc32_cpu_type_info = {
 183     .name = TYPE_UNICORE32_CPU,
 184     .parent = TYPE_CPU,
 185     .instance_size = sizeof(UniCore32CPU),
 186     .instance_init = uc32_cpu_initfn,
 187     .abstract = true,
 188     .class_size = sizeof(UniCore32CPUClass),
 189     .class_init = uc32_cpu_class_init,
 190 };
 191
 192 static void uc32_cpu_register_types(void)
 193 {
 194     int i;
 195
 196     type_register_static(&uc32_cpu_type_info);
 197     for (i = 0; i < ARRAY_SIZE(uc32_cpus); i++) {
 198         uc32_register_cpu_type(&uc32_cpus[i]);
 199     }
 200 }
 201
 202 type_init(uc32_cpu_register_types)