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     typename = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, cpu_model);
  48     oc = object_class_by_name(typename);
  49     g_free(typename);
  50     if (oc != NULL && (!object_class_dynamic_cast(oc, TYPE_UNICORE32_CPU) ||
  51                        object_class_is_abstract(oc))) {
  52         oc = NULL;
  53     }
  54     return oc;
  55 }
  56
  57 typedef struct UniCore32CPUInfo {
  58     const char *name;
  59     void (*instance_init)(Object *obj);
  60 } UniCore32CPUInfo;
  61
  62 static void unicore_ii_cpu_initfn(Object *obj)
  63 {
  64     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  65     CPUUniCore32State *env = &cpu->env;
  66
  67     env->cp0.c0_cpuid = 0x4d000863;
  68     env->cp0.c0_cachetype = 0x0d152152;
  69     env->cp0.c1_sys = 0x2000;
  70     env->cp0.c2_base = 0x0;
  71     env->cp0.c3_faultstatus = 0x0;
  72     env->cp0.c4_faultaddr = 0x0;
  73     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  74
  75     set_feature(env, UC32_HWCAP_CMOV);
  76     set_feature(env, UC32_HWCAP_UCF64);
  77     set_snan_bit_is_one(1, &env->ucf64.fp_status);
  78 }
  79
  80 static void uc32_any_cpu_initfn(Object *obj)
  81 {
  82     UniCore32CPU *cpu = UNICORE32_CPU(obj);
  83     CPUUniCore32State *env = &cpu->env;
  84
  85     env->cp0.c0_cpuid = 0xffffffff;
  86     env->ucf64.xregs[UC32_UCF64_FPSCR] = 0;
  87
  88     set_feature(env, UC32_HWCAP_CMOV);
  89     set_feature(env, UC32_HWCAP_UCF64);
  90     set_snan_bit_is_one(1, &env->ucf64.fp_status);
  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     CPUState *cs = CPU(dev);
 101     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 102     Error *local_err = NULL;
 103
 104     cpu_exec_realizefn(cs, &local_err);
 105     if (local_err != NULL) {
 106         error_propagate(errp, local_err);
 107         return;
 108     }
 109
 110     qemu_init_vcpu(cs);
 111
 112     ucc->parent_realize(dev, errp);
 113 }
 114
 115 static void uc32_cpu_initfn(Object *obj)
 116 {
 117     CPUState *cs = CPU(obj);
 118     UniCore32CPU *cpu = UNICORE32_CPU(obj);
 119     CPUUniCore32State *env = &cpu->env;
 120
 121     cs->env_ptr = env;
 122
 123 #ifdef CONFIG_USER_ONLY
 124     env->uncached_asr = ASR_MODE_USER;
 125     env->regs[31] = 0;
 126 #else
 127     env->uncached_asr = ASR_MODE_PRIV;
 128     env->regs[31] = 0x03000000;
 129 #endif
 130
 131     tlb_flush(cs);
 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     cc->tcg_initialize = uc32_translate_init;
 160     dc->vmsd = &vmstate_uc32_cpu;
 161 }
 162
 163 static void uc32_register_cpu_type(const UniCore32CPUInfo *info)
 164 {
 165     TypeInfo type_info = {
 166         .parent = TYPE_UNICORE32_CPU,
 167         .instance_init = info->instance_init,
 168     };
 169
 170     type_info.name = g_strdup_printf("%s-" TYPE_UNICORE32_CPU, info->name);
 171     type_register(&type_info);
 172     g_free((void *)type_info.name);
 173 }
 174
 175 static const TypeInfo uc32_cpu_type_info = {
 176     .name = TYPE_UNICORE32_CPU,
 177     .parent = TYPE_CPU,
 178     .instance_size = sizeof(UniCore32CPU),
 179     .instance_init = uc32_cpu_initfn,
 180     .abstract = true,
 181     .class_size = sizeof(UniCore32CPUClass),
 182     .class_init = uc32_cpu_class_init,
 183 };
 184
 185 static void uc32_cpu_register_types(void)
 186 {
 187     int i;
 188
 189     type_register_static(&uc32_cpu_type_info);
 190     for (i = 0; i < ARRAY_SIZE(uc32_cpus); i++) {
 191         uc32_register_cpu_type(&uc32_cpus[i]);
 192     }
 193 }
 194
 195 type_init(uc32_cpu_register_types)