target-xtensa/cpu.h

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef CPU_XTENSA_H
  29 #define CPU_XTENSA_H
  30
  31 #define ALIGNED_ONLY
  32 #define TARGET_LONG_BITS 32
  33 #define ELF_MACHINE EM_XTENSA
  34
  35 #define CPUArchState struct CPUXtensaState
  36
  37 #include "config.h"
  38 #include "qemu-common.h"
  39 #include "exec/cpu-defs.h"
  40 #include "fpu/softfloat.h"
  41
  42 #define TARGET_HAS_ICE 1
  43
  44 #define NB_MMU_MODES 4
  45
  46 #define TARGET_PHYS_ADDR_SPACE_BITS 32
  47 #define TARGET_VIRT_ADDR_SPACE_BITS 32
  48 #define TARGET_PAGE_BITS 12
  49
  50 enum {
  51     /* Additional instructions */
  52     XTENSA_OPTION_CODE_DENSITY,
  53     XTENSA_OPTION_LOOP,
  54     XTENSA_OPTION_EXTENDED_L32R,
  55     XTENSA_OPTION_16_BIT_IMUL,
  56     XTENSA_OPTION_32_BIT_IMUL,
  57     XTENSA_OPTION_32_BIT_IMUL_HIGH,
  58     XTENSA_OPTION_32_BIT_IDIV,
  59     XTENSA_OPTION_MAC16,
  60     XTENSA_OPTION_MISC_OP_NSA,
  61     XTENSA_OPTION_MISC_OP_MINMAX,
  62     XTENSA_OPTION_MISC_OP_SEXT,
  63     XTENSA_OPTION_MISC_OP_CLAMPS,
  64     XTENSA_OPTION_COPROCESSOR,
  65     XTENSA_OPTION_BOOLEAN,
  66     XTENSA_OPTION_FP_COPROCESSOR,
  67     XTENSA_OPTION_MP_SYNCHRO,
  68     XTENSA_OPTION_CONDITIONAL_STORE,
  69     XTENSA_OPTION_ATOMCTL,
  70
  71     /* Interrupts and exceptions */
  72     XTENSA_OPTION_EXCEPTION,
  73     XTENSA_OPTION_RELOCATABLE_VECTOR,
  74     XTENSA_OPTION_UNALIGNED_EXCEPTION,
  75     XTENSA_OPTION_INTERRUPT,
  76     XTENSA_OPTION_HIGH_PRIORITY_INTERRUPT,
  77     XTENSA_OPTION_TIMER_INTERRUPT,
  78
  79     /* Local memory */
  80     XTENSA_OPTION_ICACHE,
  81     XTENSA_OPTION_ICACHE_TEST,
  82     XTENSA_OPTION_ICACHE_INDEX_LOCK,
  83     XTENSA_OPTION_DCACHE,
  84     XTENSA_OPTION_DCACHE_TEST,
  85     XTENSA_OPTION_DCACHE_INDEX_LOCK,
  86     XTENSA_OPTION_IRAM,
  87     XTENSA_OPTION_IROM,
  88     XTENSA_OPTION_DRAM,
  89     XTENSA_OPTION_DROM,
  90     XTENSA_OPTION_XLMI,
  91     XTENSA_OPTION_HW_ALIGNMENT,
  92     XTENSA_OPTION_MEMORY_ECC_PARITY,
  93
  94     /* Memory protection and translation */
  95     XTENSA_OPTION_REGION_PROTECTION,
  96     XTENSA_OPTION_REGION_TRANSLATION,
  97     XTENSA_OPTION_MMU,
  98     XTENSA_OPTION_CACHEATTR,
  99
 100     /* Other */
 101     XTENSA_OPTION_WINDOWED_REGISTER,
 102     XTENSA_OPTION_PROCESSOR_INTERFACE,
 103     XTENSA_OPTION_MISC_SR,
 104     XTENSA_OPTION_THREAD_POINTER,
 105     XTENSA_OPTION_PROCESSOR_ID,
 106     XTENSA_OPTION_DEBUG,
 107     XTENSA_OPTION_TRACE_PORT,
 108 };
 109
 110 enum {
 111     THREADPTR = 231,
 112     FCR = 232,
 113     FSR = 233,
 114 };
 115
 116 enum {
 117     LBEG = 0,
 118     LEND = 1,
 119     LCOUNT = 2,
 120     SAR = 3,
 121     BR = 4,
 122     LITBASE = 5,
 123     SCOMPARE1 = 12,
 124     ACCLO = 16,
 125     ACCHI = 17,
 126     MR = 32,
 127     WINDOW_BASE = 72,
 128     WINDOW_START = 73,
 129     PTEVADDR = 83,
 130     RASID = 90,
 131     ITLBCFG = 91,
 132     DTLBCFG = 92,
 133     IBREAKENABLE = 96,
 134     CACHEATTR = 98,
 135     ATOMCTL = 99,
 136     IBREAKA = 128,
 137     DBREAKA = 144,
 138     DBREAKC = 160,
 139     CONFIGID0 = 176,
 140     EPC1 = 177,
 141     DEPC = 192,
 142     EPS2 = 194,
 143     CONFIGID1 = 208,
 144     EXCSAVE1 = 209,
 145     CPENABLE = 224,
 146     INTSET = 226,
 147     INTCLEAR = 227,
 148     INTENABLE = 228,
 149     PS = 230,
 150     VECBASE = 231,
 151     EXCCAUSE = 232,
 152     DEBUGCAUSE = 233,
 153     CCOUNT = 234,
 154     PRID = 235,
 155     ICOUNT = 236,
 156     ICOUNTLEVEL = 237,
 157     EXCVADDR = 238,
 158     CCOMPARE = 240,
 159     MISC = 244,
 160 };
 161
 162 #define PS_INTLEVEL 0xf
 163 #define PS_INTLEVEL_SHIFT 0
 164
 165 #define PS_EXCM 0x10
 166 #define PS_UM 0x20
 167
 168 #define PS_RING 0xc0
 169 #define PS_RING_SHIFT 6
 170
 171 #define PS_OWB 0xf00
 172 #define PS_OWB_SHIFT 8
 173
 174 #define PS_CALLINC 0x30000
 175 #define PS_CALLINC_SHIFT 16
 176 #define PS_CALLINC_LEN 2
 177
 178 #define PS_WOE 0x40000
 179
 180 #define DEBUGCAUSE_IC 0x1
 181 #define DEBUGCAUSE_IB 0x2
 182 #define DEBUGCAUSE_DB 0x4
 183 #define DEBUGCAUSE_BI 0x8
 184 #define DEBUGCAUSE_BN 0x10
 185 #define DEBUGCAUSE_DI 0x20
 186 #define DEBUGCAUSE_DBNUM 0xf00
 187 #define DEBUGCAUSE_DBNUM_SHIFT 8
 188
 189 #define DBREAKC_SB 0x80000000
 190 #define DBREAKC_LB 0x40000000
 191 #define DBREAKC_SB_LB (DBREAKC_SB | DBREAKC_LB)
 192 #define DBREAKC_MASK 0x3f
 193
 194 #define MAX_NAREG 64
 195 #define MAX_NINTERRUPT 32
 196 #define MAX_NLEVEL 6
 197 #define MAX_NNMI 1
 198 #define MAX_NCCOMPARE 3
 199 #define MAX_TLB_WAY_SIZE 8
 200 #define MAX_NDBREAK 2
 201
 202 #define REGION_PAGE_MASK 0xe0000000
 203
 204 #define PAGE_CACHE_MASK    0x700
 205 #define PAGE_CACHE_SHIFT   8
 206 #define PAGE_CACHE_INVALID 0x000
 207 #define PAGE_CACHE_BYPASS  0x100
 208 #define PAGE_CACHE_WT      0x200
 209 #define PAGE_CACHE_WB      0x400
 210 #define PAGE_CACHE_ISOLATE 0x600
 211
 212 enum {
 213     /* Static vectors */
 214     EXC_RESET,
 215     EXC_MEMORY_ERROR,
 216
 217     /* Dynamic vectors */
 218     EXC_WINDOW_OVERFLOW4,
 219     EXC_WINDOW_UNDERFLOW4,
 220     EXC_WINDOW_OVERFLOW8,
 221     EXC_WINDOW_UNDERFLOW8,
 222     EXC_WINDOW_OVERFLOW12,
 223     EXC_WINDOW_UNDERFLOW12,
 224     EXC_IRQ,
 225     EXC_KERNEL,
 226     EXC_USER,
 227     EXC_DOUBLE,
 228     EXC_DEBUG,
 229     EXC_MAX
 230 };
 231
 232 enum {
 233     ILLEGAL_INSTRUCTION_CAUSE = 0,
 234     SYSCALL_CAUSE,
 235     INSTRUCTION_FETCH_ERROR_CAUSE,
 236     LOAD_STORE_ERROR_CAUSE,
 237     LEVEL1_INTERRUPT_CAUSE,
 238     ALLOCA_CAUSE,
 239     INTEGER_DIVIDE_BY_ZERO_CAUSE,
 240     PRIVILEGED_CAUSE = 8,
 241     LOAD_STORE_ALIGNMENT_CAUSE,
 242
 243     INSTR_PIF_DATA_ERROR_CAUSE = 12,
 244     LOAD_STORE_PIF_DATA_ERROR_CAUSE,
 245     INSTR_PIF_ADDR_ERROR_CAUSE,
 246     LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
 247
 248     INST_TLB_MISS_CAUSE,
 249     INST_TLB_MULTI_HIT_CAUSE,
 250     INST_FETCH_PRIVILEGE_CAUSE,
 251     INST_FETCH_PROHIBITED_CAUSE = 20,
 252     LOAD_STORE_TLB_MISS_CAUSE = 24,
 253     LOAD_STORE_TLB_MULTI_HIT_CAUSE,
 254     LOAD_STORE_PRIVILEGE_CAUSE,
 255     LOAD_PROHIBITED_CAUSE = 28,
 256     STORE_PROHIBITED_CAUSE,
 257
 258     COPROCESSOR0_DISABLED = 32,
 259 };
 260
 261 typedef enum {
 262     INTTYPE_LEVEL,
 263     INTTYPE_EDGE,
 264     INTTYPE_NMI,
 265     INTTYPE_SOFTWARE,
 266     INTTYPE_TIMER,
 267     INTTYPE_DEBUG,
 268     INTTYPE_WRITE_ERR,
 269     INTTYPE_MAX
 270 } interrupt_type;
 271
 272 typedef struct xtensa_tlb_entry {
 273     uint32_t vaddr;
 274     uint32_t paddr;
 275     uint8_t asid;
 276     uint8_t attr;
 277     bool variable;
 278 } xtensa_tlb_entry;
 279
 280 typedef struct xtensa_tlb {
 281     unsigned nways;
 282     const unsigned way_size[10];
 283     bool varway56;
 284     unsigned nrefillentries;
 285 } xtensa_tlb;
 286
 287 typedef struct XtensaGdbReg {
 288     int targno;
 289     int type;
 290     int group;
 291 } XtensaGdbReg;
 292
 293 typedef struct XtensaGdbRegmap {
 294     int num_regs;
 295     int num_core_regs;
 296     /* PC + a + ar + sr + ur */
 297     XtensaGdbReg reg[1 + 16 + 64 + 256 + 256];
 298 } XtensaGdbRegmap;
 299
 300 typedef struct XtensaConfig {
 301     const char *name;
 302     uint64_t options;
 303     XtensaGdbRegmap gdb_regmap;
 304     unsigned nareg;
 305     int excm_level;
 306     int ndepc;
 307     uint32_t vecbase;
 308     uint32_t exception_vector[EXC_MAX];
 309     unsigned ninterrupt;
 310     unsigned nlevel;
 311     uint32_t interrupt_vector[MAX_NLEVEL + MAX_NNMI + 1];
 312     uint32_t level_mask[MAX_NLEVEL + MAX_NNMI + 1];
 313     uint32_t inttype_mask[INTTYPE_MAX];
 314     struct {
 315         uint32_t level;
 316         interrupt_type inttype;
 317     } interrupt[MAX_NINTERRUPT];
 318     unsigned nccompare;
 319     uint32_t timerint[MAX_NCCOMPARE];
 320     unsigned nextint;
 321     unsigned extint[MAX_NINTERRUPT];
 322
 323     unsigned debug_level;
 324     unsigned nibreak;
 325     unsigned ndbreak;
 326
 327     uint32_t configid[2];
 328
 329     uint32_t clock_freq_khz;
 330
 331     xtensa_tlb itlb;
 332     xtensa_tlb dtlb;
 333 } XtensaConfig;
 334
 335 typedef struct XtensaConfigList {
 336     const XtensaConfig *config;
 337     struct XtensaConfigList *next;
 338 } XtensaConfigList;
 339
 340 typedef struct CPUXtensaState {
 341     const XtensaConfig *config;
 342     uint32_t regs[16];
 343     uint32_t pc;
 344     uint32_t sregs[256];
 345     uint32_t uregs[256];
 346     uint32_t phys_regs[MAX_NAREG];
 347     float32 fregs[16];
 348     float_status fp_status;
 349
 350     xtensa_tlb_entry itlb[7][MAX_TLB_WAY_SIZE];
 351     xtensa_tlb_entry dtlb[10][MAX_TLB_WAY_SIZE];
 352     unsigned autorefill_idx;
 353
 354     int pending_irq_level; /* level of last raised IRQ */
 355     void **irq_inputs;
 356     QEMUTimer *ccompare_timer;
 357     uint32_t wake_ccount;
 358     int64_t halt_clock;
 359
 360     int exception_taken;
 361
 362     /* Watchpoints for DBREAK registers */
 363     struct CPUWatchpoint *cpu_watchpoint[MAX_NDBREAK];
 364
 365     CPU_COMMON
 366 } CPUXtensaState;
 367
 368 #include "cpu-qom.h"
 369
 370 #define cpu_exec cpu_xtensa_exec
 371 #define cpu_gen_code cpu_xtensa_gen_code
 372 #define cpu_signal_handler cpu_xtensa_signal_handler
 373 #define cpu_list xtensa_cpu_list
 374
 375 #ifdef TARGET_WORDS_BIGENDIAN
 376 #define XTENSA_DEFAULT_CPU_MODEL "fsf"
 377 #else
 378 #define XTENSA_DEFAULT_CPU_MODEL "dc232b"
 379 #endif
 380
 381 XtensaCPU *cpu_xtensa_init(const char *cpu_model);
 382
 383 static inline CPUXtensaState *cpu_init(const char *cpu_model)
 384 {
 385     XtensaCPU *cpu = cpu_xtensa_init(cpu_model);
 386     if (cpu == NULL) {
 387         return NULL;
 388     }
 389     return &cpu->env;
 390 }
 391
 392 void xtensa_translate_init(void);
 393 void xtensa_breakpoint_handler(CPUXtensaState *env);
 394 int cpu_xtensa_exec(CPUXtensaState *s);
 395 void xtensa_register_core(XtensaConfigList *node);
 396 void check_interrupts(CPUXtensaState *s);
 397 void xtensa_irq_init(CPUXtensaState *env);
 398 void *xtensa_get_extint(CPUXtensaState *env, unsigned extint);
 399 void xtensa_advance_ccount(CPUXtensaState *env, uint32_t d);
 400 void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active);
 401 void xtensa_rearm_ccompare_timer(CPUXtensaState *env);
 402 int cpu_xtensa_signal_handler(int host_signum, void *pinfo, void *puc);
 403 void xtensa_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 404 void xtensa_sync_window_from_phys(CPUXtensaState *env);
 405 void xtensa_sync_phys_from_window(CPUXtensaState *env);
 406 uint32_t xtensa_tlb_get_addr_mask(const CPUXtensaState *env, bool dtlb, uint32_t way);
 407 void split_tlb_entry_spec_way(const CPUXtensaState *env, uint32_t v, bool dtlb,
 408         uint32_t *vpn, uint32_t wi, uint32_t *ei);
 409 int xtensa_tlb_lookup(const CPUXtensaState *env, uint32_t addr, bool dtlb,
 410         uint32_t *pwi, uint32_t *pei, uint8_t *pring);
 411 void xtensa_tlb_set_entry_mmu(const CPUXtensaState *env,
 412         xtensa_tlb_entry *entry, bool dtlb,
 413         unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
 414 void xtensa_tlb_set_entry(CPUXtensaState *env, bool dtlb,
 415         unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
 416 int xtensa_get_physical_addr(CPUXtensaState *env, bool update_tlb,
 417         uint32_t vaddr, int is_write, int mmu_idx,
 418         uint32_t *paddr, uint32_t *page_size, unsigned *access);
 419 void reset_mmu(CPUXtensaState *env);
 420 void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUXtensaState *env);
 421 void debug_exception_env(CPUXtensaState *new_env, uint32_t cause);
 422
 423
 424 #define XTENSA_OPTION_BIT(opt) (((uint64_t)1) << (opt))
 425 #define XTENSA_OPTION_ALL (~(uint64_t)0)
 426
 427 static inline bool xtensa_option_bits_enabled(const XtensaConfig *config,
 428         uint64_t opt)
 429 {
 430     return (config->options & opt) != 0;
 431 }
 432
 433 static inline bool xtensa_option_enabled(const XtensaConfig *config, int opt)
 434 {
 435     return xtensa_option_bits_enabled(config, XTENSA_OPTION_BIT(opt));
 436 }
 437
 438 static inline int xtensa_get_cintlevel(const CPUXtensaState *env)
 439 {
 440     int level = (env->sregs[PS] & PS_INTLEVEL) >> PS_INTLEVEL_SHIFT;
 441     if ((env->sregs[PS] & PS_EXCM) && env->config->excm_level > level) {
 442         level = env->config->excm_level;
 443     }
 444     return level;
 445 }
 446
 447 static inline int xtensa_get_ring(const CPUXtensaState *env)
 448 {
 449     if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
 450         return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
 451     } else {
 452         return 0;
 453     }
 454 }
 455
 456 static inline int xtensa_get_cring(const CPUXtensaState *env)
 457 {
 458     if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU) &&
 459             (env->sregs[PS] & PS_EXCM) == 0) {
 460         return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
 461     } else {
 462         return 0;
 463     }
 464 }
 465
 466 static inline xtensa_tlb_entry *xtensa_tlb_get_entry(CPUXtensaState *env,
 467         bool dtlb, unsigned wi, unsigned ei)
 468 {
 469     return dtlb ?
 470         env->dtlb[wi] + ei :
 471         env->itlb[wi] + ei;
 472 }
 473
 474 /* MMU modes definitions */
 475 #define MMU_MODE0_SUFFIX _ring0
 476 #define MMU_MODE1_SUFFIX _ring1
 477 #define MMU_MODE2_SUFFIX _ring2
 478 #define MMU_MODE3_SUFFIX _ring3
 479
 480 static inline int cpu_mmu_index(CPUXtensaState *env)
 481 {
 482     return xtensa_get_cring(env);
 483 }
 484
 485 #define XTENSA_TBFLAG_RING_MASK 0x3
 486 #define XTENSA_TBFLAG_EXCM 0x4
 487 #define XTENSA_TBFLAG_LITBASE 0x8
 488 #define XTENSA_TBFLAG_DEBUG 0x10
 489 #define XTENSA_TBFLAG_ICOUNT 0x20
 490 #define XTENSA_TBFLAG_CPENABLE_MASK 0x3fc0
 491 #define XTENSA_TBFLAG_CPENABLE_SHIFT 6
 492 #define XTENSA_TBFLAG_EXCEPTION 0x4000
 493
 494 static inline void cpu_get_tb_cpu_state(CPUXtensaState *env, target_ulong *pc,
 495         target_ulong *cs_base, int *flags)
 496 {
 497     CPUState *cs = CPU(xtensa_env_get_cpu(env));
 498
 499     *pc = env->pc;
 500     *cs_base = 0;
 501     *flags = 0;
 502     *flags |= xtensa_get_ring(env);
 503     if (env->sregs[PS] & PS_EXCM) {
 504         *flags |= XTENSA_TBFLAG_EXCM;
 505     }
 506     if (xtensa_option_enabled(env->config, XTENSA_OPTION_EXTENDED_L32R) &&
 507             (env->sregs[LITBASE] & 1)) {
 508         *flags |= XTENSA_TBFLAG_LITBASE;
 509     }
 510     if (xtensa_option_enabled(env->config, XTENSA_OPTION_DEBUG)) {
 511         if (xtensa_get_cintlevel(env) < env->config->debug_level) {
 512             *flags |= XTENSA_TBFLAG_DEBUG;
 513         }
 514         if (xtensa_get_cintlevel(env) < env->sregs[ICOUNTLEVEL]) {
 515             *flags |= XTENSA_TBFLAG_ICOUNT;
 516         }
 517     }
 518     if (xtensa_option_enabled(env->config, XTENSA_OPTION_COPROCESSOR)) {
 519         *flags |= env->sregs[CPENABLE] << XTENSA_TBFLAG_CPENABLE_SHIFT;
 520     }
 521     if (cs->singlestep_enabled && env->exception_taken) {
 522         *flags |= XTENSA_TBFLAG_EXCEPTION;
 523     }
 524 }
 525
 526 #include "exec/cpu-all.h"
 527 #include "exec/exec-all.h"
 528
 529 #endif