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     CPUState *cs = CPU(dev);
 105     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 106     Error *local_err = NULL;
 107
 108     cpu_exec_realizefn(cs, &local_err);
 109     if (local_err != NULL) {
 110         error_propagate(errp, local_err);
 111         return;
 112     }
 113
 114     qemu_init_vcpu(cs);
 115
 116     ucc->parent_realize(dev, errp);
 117 }
 118
 119 static void uc32_cpu_initfn(Object *obj)
 120 {
 121     CPUState *cs = CPU(obj);
 122     UniCore32CPU *cpu = UNICORE32_CPU(obj);
 123     CPUUniCore32State *env = &cpu->env;
 124     static bool inited;
 125
 126     cs->env_ptr = env;
 127
 128 #ifdef CONFIG_USER_ONLY
 129     env->uncached_asr = ASR_MODE_USER;
 130     env->regs[31] = 0;
 131 #else
 132     env->uncached_asr = ASR_MODE_PRIV;
 133     env->regs[31] = 0x03000000;
 134 #endif
 135
 136     tlb_flush(cs, 1);
 137
 138     if (tcg_enabled() && !inited) {
 139         inited = true;
 140         uc32_translate_init();
 141     }
 142 }
 143
 144 static const VMStateDescription vmstate_uc32_cpu = {
 145     .name = "cpu",
 146     .unmigratable = 1,
 147 };
 148
 149 static void uc32_cpu_class_init(ObjectClass *oc, void *data)
 150 {
 151     DeviceClass *dc = DEVICE_CLASS(oc);
 152     CPUClass *cc = CPU_CLASS(oc);
 153     UniCore32CPUClass *ucc = UNICORE32_CPU_CLASS(oc);
 154
 155     ucc->parent_realize = dc->realize;
 156     dc->realize = uc32_cpu_realizefn;
 157
 158     cc->class_by_name = uc32_cpu_class_by_name;
 159     cc->has_work = uc32_cpu_has_work;
 160     cc->do_interrupt = uc32_cpu_do_interrupt;
 161     cc->cpu_exec_interrupt = uc32_cpu_exec_interrupt;
 162     cc->dump_state = uc32_cpu_dump_state;
 163     cc->set_pc = uc32_cpu_set_pc;
 164 #ifdef CONFIG_USER_ONLY
 165     cc->handle_mmu_fault = uc32_cpu_handle_mmu_fault;
 166 #else
 167     cc->get_phys_page_debug = uc32_cpu_get_phys_page_debug;
 168 #endif
 169     dc->vmsd = &vmstate_uc32_cpu;
 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)