target-openrisc/cpu.h

   1 /*
   2  * OpenRISC virtual CPU header.
   3  *
   4  * Copyright (c) 2011-2012 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 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 #ifndef CPU_OPENRISC_H
  21 #define CPU_OPENRISC_H
  22
  23 #define TARGET_LONG_BITS 32
  24 #define ELF_MACHINE    EM_OPENRISC
  25
  26 #define CPUArchState struct CPUOpenRISCState
  27
  28 /* cpu_openrisc_map_address_* in CPUOpenRISCTLBContext need this decl.  */
  29 struct OpenRISCCPU;
  30
  31 #include "config.h"
  32 #include "qemu-common.h"
  33 #include "cpu-defs.h"
  34 #include "softfloat.h"
  35 #include "qemu/cpu.h"
  36 #include "error.h"
  37
  38 #define TYPE_OPENRISC_CPU "or32-cpu"
  39
  40 #define OPENRISC_CPU_CLASS(klass) \
  41     OBJECT_CLASS_CHECK(OpenRISCCPUClass, (klass), TYPE_OPENRISC_CPU)
  42 #define OPENRISC_CPU(obj) \
  43     OBJECT_CHECK(OpenRISCCPU, (obj), TYPE_OPENRISC_CPU)
  44 #define OPENRISC_CPU_GET_CLASS(obj) \
  45     OBJECT_GET_CLASS(OpenRISCCPUClass, (obj), TYPE_OPENRISC_CPU)
  46
  47 /**
  48  * OpenRISCCPUClass:
  49  * @parent_reset: The parent class' reset handler.
  50  *
  51  * A OpenRISC CPU model.
  52  */
  53 typedef struct OpenRISCCPUClass {
  54     /*< private >*/
  55     CPUClass parent_class;
  56     /*< public >*/
  57
  58     void (*parent_reset)(CPUState *cpu);
  59 } OpenRISCCPUClass;
  60
  61 #define NB_MMU_MODES    3
  62
  63 enum {
  64     MMU_NOMMU_IDX = 0,
  65     MMU_SUPERVISOR_IDX = 1,
  66     MMU_USER_IDX = 2,
  67 };
  68
  69 #define TARGET_PAGE_BITS 13
  70
  71 #define TARGET_PHYS_ADDR_SPACE_BITS 32
  72 #define TARGET_VIRT_ADDR_SPACE_BITS 32
  73
  74 #define SET_FP_CAUSE(reg, v)    do {\
  75                                     (reg) = ((reg) & ~(0x3f << 12)) | \
  76                                             ((v & 0x3f) << 12);\
  77                                 } while (0)
  78 #define GET_FP_ENABLE(reg)       (((reg) >>  7) & 0x1f)
  79 #define UPDATE_FP_FLAGS(reg, v)   do {\
  80                                       (reg) |= ((v & 0x1f) << 2);\
  81                                   } while (0)
  82
  83 /* Version Register */
  84 #define SPR_VR 0xFFFF003F
  85
  86 /* Internal flags, delay slot flag */
  87 #define D_FLAG    1
  88
  89 /* Interrupt */
  90 #define NR_IRQS  32
  91
  92 /* Registers */
  93 enum {
  94     R0 = 0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10,
  95     R11, R12, R13, R14, R15, R16, R17, R18, R19, R20,
  96     R21, R22, R23, R24, R25, R26, R27, R28, R29, R30,
  97     R31
  98 };
  99
 100 /* Register aliases */
 101 enum {
 102     R_ZERO = R0,
 103     R_SP = R1,
 104     R_FP = R2,
 105     R_LR = R9,
 106     R_RV = R11,
 107     R_RVH = R12
 108 };
 109
 110 /* Unit presece register */
 111 enum {
 112     UPR_UP = (1 << 0),
 113     UPR_DCP = (1 << 1),
 114     UPR_ICP = (1 << 2),
 115     UPR_DMP = (1 << 3),
 116     UPR_IMP = (1 << 4),
 117     UPR_MP = (1 << 5),
 118     UPR_DUP = (1 << 6),
 119     UPR_PCUR = (1 << 7),
 120     UPR_PMP = (1 << 8),
 121     UPR_PICP = (1 << 9),
 122     UPR_TTP = (1 << 10),
 123     UPR_CUP = (255 << 24),
 124 };
 125
 126 /* CPU configure register */
 127 enum {
 128     CPUCFGR_NSGF = (15 << 0),
 129     CPUCFGR_CGF = (1 << 4),
 130     CPUCFGR_OB32S = (1 << 5),
 131     CPUCFGR_OB64S = (1 << 6),
 132     CPUCFGR_OF32S = (1 << 7),
 133     CPUCFGR_OF64S = (1 << 8),
 134     CPUCFGR_OV64S = (1 << 9),
 135 };
 136
 137 /* DMMU configure register */
 138 enum {
 139     DMMUCFGR_NTW = (3 << 0),
 140     DMMUCFGR_NTS = (7 << 2),
 141     DMMUCFGR_NAE = (7 << 5),
 142     DMMUCFGR_CRI = (1 << 8),
 143     DMMUCFGR_PRI = (1 << 9),
 144     DMMUCFGR_TEIRI = (1 << 10),
 145     DMMUCFGR_HTR = (1 << 11),
 146 };
 147
 148 /* IMMU configure register */
 149 enum {
 150     IMMUCFGR_NTW = (3 << 0),
 151     IMMUCFGR_NTS = (7 << 2),
 152     IMMUCFGR_NAE = (7 << 5),
 153     IMMUCFGR_CRI = (1 << 8),
 154     IMMUCFGR_PRI = (1 << 9),
 155     IMMUCFGR_TEIRI = (1 << 10),
 156     IMMUCFGR_HTR = (1 << 11),
 157 };
 158
 159 /* Float point control status register */
 160 enum {
 161     FPCSR_FPEE = 1,
 162     FPCSR_RM = (3 << 1),
 163     FPCSR_OVF = (1 << 3),
 164     FPCSR_UNF = (1 << 4),
 165     FPCSR_SNF = (1 << 5),
 166     FPCSR_QNF = (1 << 6),
 167     FPCSR_ZF = (1 << 7),
 168     FPCSR_IXF = (1 << 8),
 169     FPCSR_IVF = (1 << 9),
 170     FPCSR_INF = (1 << 10),
 171     FPCSR_DZF = (1 << 11),
 172 };
 173
 174 /* Exceptions indices */
 175 enum {
 176     EXCP_RESET    = 0x1,
 177     EXCP_BUSERR   = 0x2,
 178     EXCP_DPF      = 0x3,
 179     EXCP_IPF      = 0x4,
 180     EXCP_TICK     = 0x5,
 181     EXCP_ALIGN    = 0x6,
 182     EXCP_ILLEGAL  = 0x7,
 183     EXCP_INT      = 0x8,
 184     EXCP_DTLBMISS = 0x9,
 185     EXCP_ITLBMISS = 0xa,
 186     EXCP_RANGE    = 0xb,
 187     EXCP_SYSCALL  = 0xc,
 188     EXCP_FPE      = 0xd,
 189     EXCP_TRAP     = 0xe,
 190     EXCP_NR,
 191 };
 192
 193 /* Supervisor register */
 194 enum {
 195     SR_SM = (1 << 0),
 196     SR_TEE = (1 << 1),
 197     SR_IEE = (1 << 2),
 198     SR_DCE = (1 << 3),
 199     SR_ICE = (1 << 4),
 200     SR_DME = (1 << 5),
 201     SR_IME = (1 << 6),
 202     SR_LEE = (1 << 7),
 203     SR_CE  = (1 << 8),
 204     SR_F   = (1 << 9),
 205     SR_CY  = (1 << 10),
 206     SR_OV  = (1 << 11),
 207     SR_OVE = (1 << 12),
 208     SR_DSX = (1 << 13),
 209     SR_EPH = (1 << 14),
 210     SR_FO  = (1 << 15),
 211     SR_SUMRA = (1 << 16),
 212     SR_SCE = (1 << 17),
 213 };
 214
 215 /* OpenRISC Hardware Capabilities */
 216 enum {
 217     OPENRISC_FEATURE_NSGF = (15 << 0),
 218     OPENRISC_FEATURE_CGF = (1 << 4),
 219     OPENRISC_FEATURE_OB32S = (1 << 5),
 220     OPENRISC_FEATURE_OB64S = (1 << 6),
 221     OPENRISC_FEATURE_OF32S = (1 << 7),
 222     OPENRISC_FEATURE_OF64S = (1 << 8),
 223     OPENRISC_FEATURE_OV64S = (1 << 9),
 224 };
 225
 226 /* Tick Timer Mode Register */
 227 enum {
 228     TTMR_TP = (0xfffffff),
 229     TTMR_IP = (1 << 28),
 230     TTMR_IE = (1 << 29),
 231     TTMR_M  = (3 << 30),
 232 };
 233
 234 /* Timer Mode */
 235 enum {
 236     TIMER_NONE = (0 << 30),
 237     TIMER_INTR = (1 << 30),
 238     TIMER_SHOT = (2 << 30),
 239     TIMER_CONT = (3 << 30),
 240 };
 241
 242 /* TLB size */
 243 enum {
 244     DTLB_WAYS = 1,
 245     DTLB_SIZE = 64,
 246     DTLB_MASK = (DTLB_SIZE-1),
 247     ITLB_WAYS = 1,
 248     ITLB_SIZE = 64,
 249     ITLB_MASK = (ITLB_SIZE-1),
 250 };
 251
 252 /* TLB prot */
 253 enum {
 254     URE = (1 << 6),
 255     UWE = (1 << 7),
 256     SRE = (1 << 8),
 257     SWE = (1 << 9),
 258
 259     SXE = (1 << 6),
 260     UXE = (1 << 7),
 261 };
 262
 263 /* check if tlb available */
 264 enum {
 265     TLBRET_INVALID = -3,
 266     TLBRET_NOMATCH = -2,
 267     TLBRET_BADADDR = -1,
 268     TLBRET_MATCH = 0
 269 };
 270
 271 typedef struct OpenRISCTLBEntry {
 272     uint32_t mr;
 273     uint32_t tr;
 274 } OpenRISCTLBEntry;
 275
 276 #ifndef CONFIG_USER_ONLY
 277 typedef struct CPUOpenRISCTLBContext {
 278     OpenRISCTLBEntry itlb[ITLB_WAYS][ITLB_SIZE];
 279     OpenRISCTLBEntry dtlb[DTLB_WAYS][DTLB_SIZE];
 280
 281     int (*cpu_openrisc_map_address_code)(struct OpenRISCCPU *cpu,
 282                                          hwaddr *physical,
 283                                          int *prot,
 284                                          target_ulong address, int rw);
 285     int (*cpu_openrisc_map_address_data)(struct OpenRISCCPU *cpu,
 286                                          hwaddr *physical,
 287                                          int *prot,
 288                                          target_ulong address, int rw);
 289 } CPUOpenRISCTLBContext;
 290 #endif
 291
 292 typedef struct CPUOpenRISCState {
 293     target_ulong gpr[32];     /* General registers */
 294     target_ulong pc;          /* Program counter */
 295     target_ulong npc;         /* Next PC */
 296     target_ulong ppc;         /* Prev PC */
 297     target_ulong jmp_pc;      /* Jump PC */
 298
 299     target_ulong machi;       /* Multiply register MACHI */
 300     target_ulong maclo;       /* Multiply register MACLO */
 301
 302     target_ulong fpmaddhi;    /* Multiply and add float register FPMADDHI */
 303     target_ulong fpmaddlo;    /* Multiply and add float register FPMADDLO */
 304
 305     target_ulong epcr;        /* Exception PC register */
 306     target_ulong eear;        /* Exception EA register */
 307
 308     uint32_t sr;              /* Supervisor register */
 309     uint32_t vr;              /* Version register */
 310     uint32_t upr;             /* Unit presence register */
 311     uint32_t cpucfgr;         /* CPU configure register */
 312     uint32_t dmmucfgr;        /* DMMU configure register */
 313     uint32_t immucfgr;        /* IMMU configure register */
 314     uint32_t esr;             /* Exception supervisor register */
 315     uint32_t fpcsr;           /* Float register */
 316     float_status fp_status;
 317
 318     uint32_t flags;           /* cpu_flags, we only use it for exception
 319                                  in solt so far.  */
 320     uint32_t btaken;          /* the SR_F bit */
 321
 322     CPU_COMMON
 323
 324 #ifndef CONFIG_USER_ONLY
 325     CPUOpenRISCTLBContext * tlb;
 326
 327     struct QEMUTimer *timer;
 328     uint32_t ttmr;          /* Timer tick mode register */
 329     uint32_t ttcr;          /* Timer tick count register */
 330
 331     uint32_t picmr;         /* Interrupt mask register */
 332     uint32_t picsr;         /* Interrupt contrl register*/
 333 #endif
 334     void *irq[32];          /* Interrupt irq input */
 335 } CPUOpenRISCState;
 336
 337 /**
 338  * OpenRISCCPU:
 339  * @env: #CPUOpenRISCState
 340  *
 341  * A OpenRISC CPU.
 342  */
 343 typedef struct OpenRISCCPU {
 344     /*< private >*/
 345     CPUState parent_obj;
 346     /*< public >*/
 347
 348     CPUOpenRISCState env;
 349
 350     uint32_t feature;       /* CPU Capabilities */
 351 } OpenRISCCPU;
 352
 353 static inline OpenRISCCPU *openrisc_env_get_cpu(CPUOpenRISCState *env)
 354 {
 355     return OPENRISC_CPU(container_of(env, OpenRISCCPU, env));
 356 }
 357
 358 #define ENV_GET_CPU(e) CPU(openrisc_env_get_cpu(e))
 359
 360 OpenRISCCPU *cpu_openrisc_init(const char *cpu_model);
 361 void openrisc_cpu_realize(Object *obj, Error **errp);
 362
 363 void cpu_openrisc_list(FILE *f, fprintf_function cpu_fprintf);
 364 int cpu_openrisc_exec(CPUOpenRISCState *s);
 365 void do_interrupt(CPUOpenRISCState *env);
 366 void openrisc_translate_init(void);
 367 int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env,
 368                                   target_ulong address,
 369                                   int rw, int mmu_idx);
 370 int cpu_openrisc_signal_handler(int host_signum, void *pinfo, void *puc);
 371
 372 #define cpu_list cpu_openrisc_list
 373 #define cpu_exec cpu_openrisc_exec
 374 #define cpu_gen_code cpu_openrisc_gen_code
 375 #define cpu_handle_mmu_fault cpu_openrisc_handle_mmu_fault
 376 #define cpu_signal_handler cpu_openrisc_signal_handler
 377
 378 #ifndef CONFIG_USER_ONLY
 379 /* hw/openrisc_pic.c */
 380 void cpu_openrisc_pic_init(OpenRISCCPU *cpu);
 381
 382 /* hw/openrisc_timer.c */
 383 void cpu_openrisc_clock_init(OpenRISCCPU *cpu);
 384 void cpu_openrisc_count_update(OpenRISCCPU *cpu);
 385 void cpu_openrisc_count_start(OpenRISCCPU *cpu);
 386 void cpu_openrisc_count_stop(OpenRISCCPU *cpu);
 387
 388 void cpu_openrisc_mmu_init(OpenRISCCPU *cpu);
 389 int cpu_openrisc_get_phys_nommu(OpenRISCCPU *cpu,
 390                                 hwaddr *physical,
 391                                 int *prot, target_ulong address, int rw);
 392 int cpu_openrisc_get_phys_code(OpenRISCCPU *cpu,
 393                                hwaddr *physical,
 394                                int *prot, target_ulong address, int rw);
 395 int cpu_openrisc_get_phys_data(OpenRISCCPU *cpu,
 396                                hwaddr *physical,
 397                                int *prot, target_ulong address, int rw);
 398 #endif
 399
 400 static inline CPUOpenRISCState *cpu_init(const char *cpu_model)
 401 {
 402     OpenRISCCPU *cpu = cpu_openrisc_init(cpu_model);
 403     if (cpu) {
 404         return &cpu->env;
 405     }
 406     return NULL;
 407 }
 408
 409 #if defined(CONFIG_USER_ONLY)
 410 static inline void cpu_clone_regs(CPUOpenRISCState *env, target_ulong newsp)
 411 {
 412     if (newsp) {
 413         env->gpr[1] = newsp;
 414     }
 415     env->gpr[2] = 0;
 416 }
 417 #endif
 418
 419 #include "cpu-all.h"
 420
 421 static inline void cpu_get_tb_cpu_state(CPUOpenRISCState *env,
 422                                         target_ulong *pc,
 423                                         target_ulong *cs_base, int *flags)
 424 {
 425     *pc = env->pc;
 426     *cs_base = 0;
 427     /* D_FLAG -- branch instruction exception */
 428     *flags = (env->flags & D_FLAG);
 429 }
 430
 431 static inline int cpu_mmu_index(CPUOpenRISCState *env)
 432 {
 433     if (!(env->sr & SR_IME)) {
 434         return MMU_NOMMU_IDX;
 435     }
 436     return (env->sr & SR_SM) == 0 ? MMU_USER_IDX : MMU_SUPERVISOR_IDX;
 437 }
 438
 439 #define CPU_INTERRUPT_TIMER   CPU_INTERRUPT_TGT_INT_0
 440 static inline bool cpu_has_work(CPUState *cpu)
 441 {
 442     CPUOpenRISCState *env = &OPENRISC_CPU(cpu)->env;
 443
 444     return env->interrupt_request & (CPU_INTERRUPT_HARD |
 445                                      CPU_INTERRUPT_TIMER);
 446 }
 447
 448 #include "exec-all.h"
 449
 450 static inline target_ulong cpu_get_pc(CPUOpenRISCState *env)
 451 {
 452     return env->pc;
 453 }
 454
 455 static inline void cpu_pc_from_tb(CPUOpenRISCState *env, TranslationBlock *tb)
 456 {
 457     env->pc = tb->pc;
 458 }
 459
 460 #endif /* CPU_OPENRISC_H */