target/openrisc/cpu.c

   1 /*
   2  * QEMU OpenRISC CPU
   3  *
   4  * Copyright (c) 2012 Jia Liu <proljc@gmail.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qapi/error.h"
  22 #include "qemu/qemu-print.h"
  23 #include "cpu.h"
  24 #include "exec/exec-all.h"
  25 #include "fpu/softfloat-helpers.h"
  26 #include "tcg/tcg.h"
  27
  28 static void openrisc_cpu_set_pc(CPUState *cs, vaddr value)
  29 {
  30     OpenRISCCPU *cpu = OPENRISC_CPU(cs);
  31
  32     cpu->env.pc = value;
  33     cpu->env.dflag = 0;
  34 }
  35
  36 static vaddr openrisc_cpu_get_pc(CPUState *cs)
  37 {
  38     OpenRISCCPU *cpu = OPENRISC_CPU(cs);
  39
  40     return cpu->env.pc;
  41 }
  42
  43 static void openrisc_cpu_synchronize_from_tb(CPUState *cs,
  44                                              const TranslationBlock *tb)
  45 {
  46     OpenRISCCPU *cpu = OPENRISC_CPU(cs);
  47
  48     tcg_debug_assert(!(cs->tcg_cflags & CF_PCREL));
  49     cpu->env.pc = tb->pc;
  50 }
  51
  52 static void openrisc_restore_state_to_opc(CPUState *cs,
  53                                           const TranslationBlock *tb,
  54                                           const uint64_t *data)
  55 {
  56     OpenRISCCPU *cpu = OPENRISC_CPU(cs);
  57
  58     cpu->env.pc = data[0];
  59     cpu->env.dflag = data[1] & 1;
  60     if (data[1] & 2) {
  61         cpu->env.ppc = cpu->env.pc - 4;
  62     }
  63 }
  64
  65 static bool openrisc_cpu_has_work(CPUState *cs)
  66 {
  67     return cs->interrupt_request & (CPU_INTERRUPT_HARD |
  68                                     CPU_INTERRUPT_TIMER);
  69 }
  70
  71 static int openrisc_cpu_mmu_index(CPUState *cs, bool ifetch)
  72 {
  73     CPUOpenRISCState *env = cpu_env(cs);
  74
  75     if (env->sr & (ifetch ? SR_IME : SR_DME)) {
  76         /* The mmu is enabled; test supervisor state.  */
  77         return env->sr & SR_SM ? MMU_SUPERVISOR_IDX : MMU_USER_IDX;
  78     }
  79
  80     return MMU_NOMMU_IDX;  /* mmu is disabled */
  81 }
  82
  83 static void openrisc_disas_set_info(CPUState *cpu, disassemble_info *info)
  84 {
  85     info->print_insn = print_insn_or1k;
  86 }
  87
  88 static void openrisc_cpu_reset_hold(Object *obj)
  89 {
  90     CPUState *s = CPU(obj);
  91     OpenRISCCPU *cpu = OPENRISC_CPU(s);
  92     OpenRISCCPUClass *occ = OPENRISC_CPU_GET_CLASS(cpu);
  93
  94     if (occ->parent_phases.hold) {
  95         occ->parent_phases.hold(obj);
  96     }
  97
  98     memset(&cpu->env, 0, offsetof(CPUOpenRISCState, end_reset_fields));
  99
 100     cpu->env.pc = 0x100;
 101     cpu->env.sr = SR_FO | SR_SM;
 102     cpu->env.lock_addr = -1;
 103     s->exception_index = -1;
 104     cpu_set_fpcsr(&cpu->env, 0);
 105
 106     set_float_detect_tininess(float_tininess_before_rounding,
 107                               &cpu->env.fp_status);
 108
 109 #ifndef CONFIG_USER_ONLY
 110     cpu->env.picmr = 0x00000000;
 111     cpu->env.picsr = 0x00000000;
 112
 113     cpu->env.ttmr = 0x00000000;
 114 #endif
 115 }
 116
 117 #ifndef CONFIG_USER_ONLY
 118 static void openrisc_cpu_set_irq(void *opaque, int irq, int level)
 119 {
 120     OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
 121     CPUState *cs = CPU(cpu);
 122     uint32_t irq_bit;
 123
 124     if (irq > 31 || irq < 0) {
 125         return;
 126     }
 127
 128     irq_bit = 1U << irq;
 129
 130     if (level) {
 131         cpu->env.picsr |= irq_bit;
 132     } else {
 133         cpu->env.picsr &= ~irq_bit;
 134     }
 135
 136     if (cpu->env.picsr & cpu->env.picmr) {
 137         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
 138     } else {
 139         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
 140     }
 141 }
 142 #endif
 143
 144 static void openrisc_cpu_realizefn(DeviceState *dev, Error **errp)
 145 {
 146     CPUState *cs = CPU(dev);
 147     OpenRISCCPUClass *occ = OPENRISC_CPU_GET_CLASS(dev);
 148     Error *local_err = NULL;
 149
 150     cpu_exec_realizefn(cs, &local_err);
 151     if (local_err != NULL) {
 152         error_propagate(errp, local_err);
 153         return;
 154     }
 155
 156     qemu_init_vcpu(cs);
 157     cpu_reset(cs);
 158
 159     occ->parent_realize(dev, errp);
 160 }
 161
 162 static void openrisc_cpu_initfn(Object *obj)
 163 {
 164 #ifndef CONFIG_USER_ONLY
 165     qdev_init_gpio_in_named(DEVICE(obj), openrisc_cpu_set_irq, "IRQ", NR_IRQS);
 166 #endif
 167 }
 168
 169 /* CPU models */
 170
 171 static ObjectClass *openrisc_cpu_class_by_name(const char *cpu_model)
 172 {
 173     ObjectClass *oc;
 174     char *typename;
 175
 176     typename = g_strdup_printf(OPENRISC_CPU_TYPE_NAME("%s"), cpu_model);
 177     oc = object_class_by_name(typename);
 178     g_free(typename);
 179
 180     return oc;
 181 }
 182
 183 static void or1200_initfn(Object *obj)
 184 {
 185     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
 186
 187     cpu->env.vr = 0x13000008;
 188     cpu->env.upr = UPR_UP | UPR_DMP | UPR_IMP | UPR_PICP | UPR_TTP | UPR_PMP;
 189     cpu->env.cpucfgr = CPUCFGR_NSGF | CPUCFGR_OB32S | CPUCFGR_OF32S |
 190                        CPUCFGR_EVBARP;
 191
 192     /* 1Way, TLB_SIZE entries.  */
 193     cpu->env.dmmucfgr = (DMMUCFGR_NTW & (0 << 2))
 194                       | (DMMUCFGR_NTS & (ctz32(TLB_SIZE) << 2));
 195     cpu->env.immucfgr = (IMMUCFGR_NTW & (0 << 2))
 196                       | (IMMUCFGR_NTS & (ctz32(TLB_SIZE) << 2));
 197 }
 198
 199 static void openrisc_any_initfn(Object *obj)
 200 {
 201     OpenRISCCPU *cpu = OPENRISC_CPU(obj);
 202
 203     cpu->env.vr = 0x13000040;   /* Obsolete VER + UVRP for new SPRs */
 204     cpu->env.vr2 = 0;           /* No version specific id */
 205     cpu->env.avr = 0x01030000;  /* Architecture v1.3 */
 206
 207     cpu->env.upr = UPR_UP | UPR_DMP | UPR_IMP | UPR_PICP | UPR_TTP | UPR_PMP;
 208     cpu->env.cpucfgr = CPUCFGR_NSGF | CPUCFGR_OB32S | CPUCFGR_OF32S |
 209                        CPUCFGR_AVRP | CPUCFGR_EVBARP | CPUCFGR_OF64A32S;
 210
 211     /* 1Way, TLB_SIZE entries.  */
 212     cpu->env.dmmucfgr = (DMMUCFGR_NTW & (0 << 2))
 213                       | (DMMUCFGR_NTS & (ctz32(TLB_SIZE) << 2));
 214     cpu->env.immucfgr = (IMMUCFGR_NTW & (0 << 2))
 215                       | (IMMUCFGR_NTS & (ctz32(TLB_SIZE) << 2));
 216 }
 217
 218 #ifndef CONFIG_USER_ONLY
 219 #include "hw/core/sysemu-cpu-ops.h"
 220
 221 static const struct SysemuCPUOps openrisc_sysemu_ops = {
 222     .get_phys_page_debug = openrisc_cpu_get_phys_page_debug,
 223 };
 224 #endif
 225
 226 #include "hw/core/tcg-cpu-ops.h"
 227
 228 static const TCGCPUOps openrisc_tcg_ops = {
 229     .initialize = openrisc_translate_init,
 230     .synchronize_from_tb = openrisc_cpu_synchronize_from_tb,
 231     .restore_state_to_opc = openrisc_restore_state_to_opc,
 232
 233 #ifndef CONFIG_USER_ONLY
 234     .tlb_fill = openrisc_cpu_tlb_fill,
 235     .cpu_exec_interrupt = openrisc_cpu_exec_interrupt,
 236     .do_interrupt = openrisc_cpu_do_interrupt,
 237 #endif /* !CONFIG_USER_ONLY */
 238 };
 239
 240 static void openrisc_cpu_class_init(ObjectClass *oc, void *data)
 241 {
 242     OpenRISCCPUClass *occ = OPENRISC_CPU_CLASS(oc);
 243     CPUClass *cc = CPU_CLASS(occ);
 244     DeviceClass *dc = DEVICE_CLASS(oc);
 245     ResettableClass *rc = RESETTABLE_CLASS(oc);
 246
 247     device_class_set_parent_realize(dc, openrisc_cpu_realizefn,
 248                                     &occ->parent_realize);
 249     resettable_class_set_parent_phases(rc, NULL, openrisc_cpu_reset_hold, NULL,
 250                                        &occ->parent_phases);
 251
 252     cc->class_by_name = openrisc_cpu_class_by_name;
 253     cc->has_work = openrisc_cpu_has_work;
 254     cc->mmu_index = openrisc_cpu_mmu_index;
 255     cc->dump_state = openrisc_cpu_dump_state;
 256     cc->set_pc = openrisc_cpu_set_pc;
 257     cc->get_pc = openrisc_cpu_get_pc;
 258     cc->gdb_read_register = openrisc_cpu_gdb_read_register;
 259     cc->gdb_write_register = openrisc_cpu_gdb_write_register;
 260 #ifndef CONFIG_USER_ONLY
 261     dc->vmsd = &vmstate_openrisc_cpu;
 262     cc->sysemu_ops = &openrisc_sysemu_ops;
 263 #endif
 264     cc->gdb_num_core_regs = 32 + 3;
 265     cc->disas_set_info = openrisc_disas_set_info;
 266     cc->tcg_ops = &openrisc_tcg_ops;
 267 }
 268
 269 #define DEFINE_OPENRISC_CPU_TYPE(cpu_model, initfn) \
 270     {                                               \
 271         .parent = TYPE_OPENRISC_CPU,                \
 272         .instance_init = initfn,                    \
 273         .name = OPENRISC_CPU_TYPE_NAME(cpu_model),  \
 274     }
 275
 276 static const TypeInfo openrisc_cpus_type_infos[] = {
 277     { /* base class should be registered first */
 278         .name = TYPE_OPENRISC_CPU,
 279         .parent = TYPE_CPU,
 280         .instance_size = sizeof(OpenRISCCPU),
 281         .instance_align = __alignof(OpenRISCCPU),
 282         .instance_init = openrisc_cpu_initfn,
 283         .abstract = true,
 284         .class_size = sizeof(OpenRISCCPUClass),
 285         .class_init = openrisc_cpu_class_init,
 286     },
 287     DEFINE_OPENRISC_CPU_TYPE("or1200", or1200_initfn),
 288     DEFINE_OPENRISC_CPU_TYPE("any", openrisc_any_initfn),
 289 };
 290
 291 DEFINE_TYPES(openrisc_cpus_type_infos)