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 TARGET_LONG_BITS 32
  32 #define ELF_MACHINE EM_XTENSA
  33
  34 #define CPUState struct CPUXtensaState
  35
  36 #include "config.h"
  37 #include "qemu-common.h"
  38 #include "cpu-defs.h"
  39
  40 #define TARGET_HAS_ICE 1
  41
  42 #define NB_MMU_MODES 4
  43
  44 #define TARGET_PHYS_ADDR_SPACE_BITS 32
  45 #define TARGET_VIRT_ADDR_SPACE_BITS 32
  46 #define TARGET_PAGE_BITS 12
  47
  48 enum {
  49     /* Additional instructions */
  50     XTENSA_OPTION_CODE_DENSITY,
  51     XTENSA_OPTION_LOOP,
  52     XTENSA_OPTION_EXTENDED_L32R,
  53     XTENSA_OPTION_16_BIT_IMUL,
  54     XTENSA_OPTION_32_BIT_IMUL,
  55     XTENSA_OPTION_32_BIT_IDIV,
  56     XTENSA_OPTION_MAC16,
  57     XTENSA_OPTION_MISC_OP,
  58     XTENSA_OPTION_COPROCESSOR,
  59     XTENSA_OPTION_BOOLEAN,
  60     XTENSA_OPTION_FP_COPROCESSOR,
  61     XTENSA_OPTION_MP_SYNCHRO,
  62     XTENSA_OPTION_CONDITIONAL_STORE,
  63
  64     /* Interrupts and exceptions */
  65     XTENSA_OPTION_EXCEPTION,
  66     XTENSA_OPTION_RELOCATABLE_VECTOR,
  67     XTENSA_OPTION_UNALIGNED_EXCEPTION,
  68     XTENSA_OPTION_INTERRUPT,
  69     XTENSA_OPTION_HIGH_PRIORITY_INTERRUPT,
  70     XTENSA_OPTION_TIMER_INTERRUPT,
  71
  72     /* Local memory */
  73     XTENSA_OPTION_ICACHE,
  74     XTENSA_OPTION_ICACHE_TEST,
  75     XTENSA_OPTION_ICACHE_INDEX_LOCK,
  76     XTENSA_OPTION_DCACHE,
  77     XTENSA_OPTION_DCACHE_TEST,
  78     XTENSA_OPTION_DCACHE_INDEX_LOCK,
  79     XTENSA_OPTION_IRAM,
  80     XTENSA_OPTION_IROM,
  81     XTENSA_OPTION_DRAM,
  82     XTENSA_OPTION_DROM,
  83     XTENSA_OPTION_XLMI,
  84     XTENSA_OPTION_HW_ALIGNMENT,
  85     XTENSA_OPTION_MEMORY_ECC_PARITY,
  86
  87     /* Memory protection and translation */
  88     XTENSA_OPTION_REGION_PROTECTION,
  89     XTENSA_OPTION_REGION_TRANSLATION,
  90     XTENSA_OPTION_MMU,
  91
  92     /* Other */
  93     XTENSA_OPTION_WINDOWED_REGISTER,
  94     XTENSA_OPTION_PROCESSOR_INTERFACE,
  95     XTENSA_OPTION_MISC_SR,
  96     XTENSA_OPTION_THREAD_POINTER,
  97     XTENSA_OPTION_PROCESSOR_ID,
  98     XTENSA_OPTION_DEBUG,
  99     XTENSA_OPTION_TRACE_PORT,
 100 };
 101
 102 enum {
 103     THREADPTR = 231,
 104     FCR = 232,
 105     FSR = 233,
 106 };
 107
 108 enum {
 109     LBEG = 0,
 110     LEND = 1,
 111     LCOUNT = 2,
 112     SAR = 3,
 113     BR = 4,
 114     LITBASE = 5,
 115     SCOMPARE1 = 12,
 116     ACCLO = 16,
 117     ACCHI = 17,
 118     MR = 32,
 119     WINDOW_BASE = 72,
 120     WINDOW_START = 73,
 121     PTEVADDR = 83,
 122     RASID = 90,
 123     ITLBCFG = 91,
 124     DTLBCFG = 92,
 125     EPC1 = 177,
 126     DEPC = 192,
 127     EPS2 = 194,
 128     EXCSAVE1 = 209,
 129     CPENABLE = 224,
 130     INTSET = 226,
 131     INTCLEAR = 227,
 132     INTENABLE = 228,
 133     PS = 230,
 134     VECBASE = 231,
 135     EXCCAUSE = 232,
 136     CCOUNT = 234,
 137     PRID = 235,
 138     EXCVADDR = 238,
 139     CCOMPARE = 240,
 140 };
 141
 142 #define PS_INTLEVEL 0xf
 143 #define PS_INTLEVEL_SHIFT 0
 144
 145 #define PS_EXCM 0x10
 146 #define PS_UM 0x20
 147
 148 #define PS_RING 0xc0
 149 #define PS_RING_SHIFT 6
 150
 151 #define PS_OWB 0xf00
 152 #define PS_OWB_SHIFT 8
 153
 154 #define PS_CALLINC 0x30000
 155 #define PS_CALLINC_SHIFT 16
 156 #define PS_CALLINC_LEN 2
 157
 158 #define PS_WOE 0x40000
 159
 160 #define MAX_NAREG 64
 161 #define MAX_NINTERRUPT 32
 162 #define MAX_NLEVEL 6
 163 #define MAX_NNMI 1
 164 #define MAX_NCCOMPARE 3
 165 #define MAX_TLB_WAY_SIZE 8
 166
 167 #define REGION_PAGE_MASK 0xe0000000
 168
 169 enum {
 170     /* Static vectors */
 171     EXC_RESET,
 172     EXC_MEMORY_ERROR,
 173
 174     /* Dynamic vectors */
 175     EXC_WINDOW_OVERFLOW4,
 176     EXC_WINDOW_UNDERFLOW4,
 177     EXC_WINDOW_OVERFLOW8,
 178     EXC_WINDOW_UNDERFLOW8,
 179     EXC_WINDOW_OVERFLOW12,
 180     EXC_WINDOW_UNDERFLOW12,
 181     EXC_IRQ,
 182     EXC_KERNEL,
 183     EXC_USER,
 184     EXC_DOUBLE,
 185     EXC_MAX
 186 };
 187
 188 enum {
 189     ILLEGAL_INSTRUCTION_CAUSE = 0,
 190     SYSCALL_CAUSE,
 191     INSTRUCTION_FETCH_ERROR_CAUSE,
 192     LOAD_STORE_ERROR_CAUSE,
 193     LEVEL1_INTERRUPT_CAUSE,
 194     ALLOCA_CAUSE,
 195     INTEGER_DIVIDE_BY_ZERO_CAUSE,
 196     PRIVILEGED_CAUSE = 8,
 197     LOAD_STORE_ALIGNMENT_CAUSE,
 198
 199     INSTR_PIF_DATA_ERROR_CAUSE = 12,
 200     LOAD_STORE_PIF_DATA_ERROR_CAUSE,
 201     INSTR_PIF_ADDR_ERROR_CAUSE,
 202     LOAD_STORE_PIF_ADDR_ERROR_CAUSE,
 203
 204     INST_TLB_MISS_CAUSE,
 205     INST_TLB_MULTI_HIT_CAUSE,
 206     INST_FETCH_PRIVILEGE_CAUSE,
 207     INST_FETCH_PROHIBITED_CAUSE = 20,
 208     LOAD_STORE_TLB_MISS_CAUSE = 24,
 209     LOAD_STORE_TLB_MULTI_HIT_CAUSE,
 210     LOAD_STORE_PRIVILEGE_CAUSE,
 211     LOAD_PROHIBITED_CAUSE = 28,
 212     STORE_PROHIBITED_CAUSE,
 213
 214     COPROCESSOR0_DISABLED = 32,
 215 };
 216
 217 typedef enum {
 218     INTTYPE_LEVEL,
 219     INTTYPE_EDGE,
 220     INTTYPE_NMI,
 221     INTTYPE_SOFTWARE,
 222     INTTYPE_TIMER,
 223     INTTYPE_DEBUG,
 224     INTTYPE_WRITE_ERR,
 225     INTTYPE_MAX
 226 } interrupt_type;
 227
 228 typedef struct xtensa_tlb_entry {
 229     uint32_t vaddr;
 230     uint32_t paddr;
 231     uint8_t asid;
 232     uint8_t attr;
 233     bool variable;
 234 } xtensa_tlb_entry;
 235
 236 typedef struct xtensa_tlb {
 237     unsigned nways;
 238     const unsigned way_size[10];
 239     bool varway56;
 240     unsigned nrefillentries;
 241 } xtensa_tlb;
 242
 243 typedef struct XtensaGdbReg {
 244     int targno;
 245     int type;
 246     int group;
 247 } XtensaGdbReg;
 248
 249 typedef struct XtensaGdbRegmap {
 250     int num_regs;
 251     int num_core_regs;
 252     /* PC + a + ar + sr + ur */
 253     XtensaGdbReg reg[1 + 16 + 64 + 256 + 256];
 254 } XtensaGdbRegmap;
 255
 256 typedef struct XtensaConfig {
 257     const char *name;
 258     uint64_t options;
 259     XtensaGdbRegmap gdb_regmap;
 260     unsigned nareg;
 261     int excm_level;
 262     int ndepc;
 263     uint32_t vecbase;
 264     uint32_t exception_vector[EXC_MAX];
 265     unsigned ninterrupt;
 266     unsigned nlevel;
 267     uint32_t interrupt_vector[MAX_NLEVEL + MAX_NNMI + 1];
 268     uint32_t level_mask[MAX_NLEVEL + MAX_NNMI + 1];
 269     uint32_t inttype_mask[INTTYPE_MAX];
 270     struct {
 271         uint32_t level;
 272         interrupt_type inttype;
 273     } interrupt[MAX_NINTERRUPT];
 274     unsigned nccompare;
 275     uint32_t timerint[MAX_NCCOMPARE];
 276     uint32_t clock_freq_khz;
 277
 278     xtensa_tlb itlb;
 279     xtensa_tlb dtlb;
 280 } XtensaConfig;
 281
 282 typedef struct CPUXtensaState {
 283     const XtensaConfig *config;
 284     uint32_t regs[16];
 285     uint32_t pc;
 286     uint32_t sregs[256];
 287     uint32_t uregs[256];
 288     uint32_t phys_regs[MAX_NAREG];
 289
 290     xtensa_tlb_entry itlb[7][MAX_TLB_WAY_SIZE];
 291     xtensa_tlb_entry dtlb[10][MAX_TLB_WAY_SIZE];
 292     unsigned autorefill_idx;
 293
 294     int pending_irq_level; /* level of last raised IRQ */
 295     void **irq_inputs;
 296     QEMUTimer *ccompare_timer;
 297     uint32_t wake_ccount;
 298     int64_t halt_clock;
 299
 300     int exception_taken;
 301
 302     CPU_COMMON
 303 } CPUXtensaState;
 304
 305 #define cpu_init cpu_xtensa_init
 306 #define cpu_exec cpu_xtensa_exec
 307 #define cpu_gen_code cpu_xtensa_gen_code
 308 #define cpu_signal_handler cpu_xtensa_signal_handler
 309 #define cpu_list xtensa_cpu_list
 310
 311 CPUXtensaState *cpu_xtensa_init(const char *cpu_model);
 312 void xtensa_translate_init(void);
 313 int cpu_xtensa_exec(CPUXtensaState *s);
 314 void do_interrupt(CPUXtensaState *s);
 315 void check_interrupts(CPUXtensaState *s);
 316 void xtensa_irq_init(CPUState *env);
 317 void xtensa_advance_ccount(CPUState *env, uint32_t d);
 318 void xtensa_timer_irq(CPUState *env, uint32_t id, uint32_t active);
 319 void xtensa_rearm_ccompare_timer(CPUState *env);
 320 int cpu_xtensa_signal_handler(int host_signum, void *pinfo, void *puc);
 321 void xtensa_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 322 void xtensa_sync_window_from_phys(CPUState *env);
 323 void xtensa_sync_phys_from_window(CPUState *env);
 324 uint32_t xtensa_tlb_get_addr_mask(const CPUState *env, bool dtlb, uint32_t way);
 325 void split_tlb_entry_spec_way(const CPUState *env, uint32_t v, bool dtlb,
 326         uint32_t *vpn, uint32_t wi, uint32_t *ei);
 327 int xtensa_tlb_lookup(const CPUState *env, uint32_t addr, bool dtlb,
 328         uint32_t *pwi, uint32_t *pei, uint8_t *pring);
 329 void xtensa_tlb_set_entry(CPUState *env, bool dtlb,
 330         unsigned wi, unsigned ei, uint32_t vpn, uint32_t pte);
 331 int xtensa_get_physical_addr(CPUState *env,
 332         uint32_t vaddr, int is_write, int mmu_idx,
 333         uint32_t *paddr, uint32_t *page_size, unsigned *access);
 334
 335
 336 #define XTENSA_OPTION_BIT(opt) (((uint64_t)1) << (opt))
 337
 338 static inline bool xtensa_option_bits_enabled(const XtensaConfig *config,
 339         uint64_t opt)
 340 {
 341     return (config->options & opt) != 0;
 342 }
 343
 344 static inline bool xtensa_option_enabled(const XtensaConfig *config, int opt)
 345 {
 346     return xtensa_option_bits_enabled(config, XTENSA_OPTION_BIT(opt));
 347 }
 348
 349 static inline int xtensa_get_cintlevel(const CPUState *env)
 350 {
 351     int level = (env->sregs[PS] & PS_INTLEVEL) >> PS_INTLEVEL_SHIFT;
 352     if ((env->sregs[PS] & PS_EXCM) && env->config->excm_level > level) {
 353         level = env->config->excm_level;
 354     }
 355     return level;
 356 }
 357
 358 static inline int xtensa_get_ring(const CPUState *env)
 359 {
 360     if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU)) {
 361         return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
 362     } else {
 363         return 0;
 364     }
 365 }
 366
 367 static inline int xtensa_get_cring(const CPUState *env)
 368 {
 369     if (xtensa_option_enabled(env->config, XTENSA_OPTION_MMU) &&
 370             (env->sregs[PS] & PS_EXCM) == 0) {
 371         return (env->sregs[PS] & PS_RING) >> PS_RING_SHIFT;
 372     } else {
 373         return 0;
 374     }
 375 }
 376
 377 static inline xtensa_tlb_entry *xtensa_tlb_get_entry(CPUState *env,
 378         bool dtlb, unsigned wi, unsigned ei)
 379 {
 380     return dtlb ?
 381         env->dtlb[wi] + ei :
 382         env->itlb[wi] + ei;
 383 }
 384
 385 /* MMU modes definitions */
 386 #define MMU_MODE0_SUFFIX _ring0
 387 #define MMU_MODE1_SUFFIX _ring1
 388 #define MMU_MODE2_SUFFIX _ring2
 389 #define MMU_MODE3_SUFFIX _ring3
 390
 391 static inline int cpu_mmu_index(CPUState *env)
 392 {
 393     return xtensa_get_cring(env);
 394 }
 395
 396 #define XTENSA_TBFLAG_RING_MASK 0x3
 397 #define XTENSA_TBFLAG_EXCM 0x4
 398 #define XTENSA_TBFLAG_LITBASE 0x8
 399
 400 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 401         target_ulong *cs_base, int *flags)
 402 {
 403     *pc = env->pc;
 404     *cs_base = 0;
 405     *flags = 0;
 406     *flags |= xtensa_get_ring(env);
 407     if (env->sregs[PS] & PS_EXCM) {
 408         *flags |= XTENSA_TBFLAG_EXCM;
 409     }
 410     if (xtensa_option_enabled(env->config, XTENSA_OPTION_EXTENDED_L32R) &&
 411             (env->sregs[LITBASE] & 1)) {
 412         *flags |= XTENSA_TBFLAG_LITBASE;
 413     }
 414 }
 415
 416 #include "cpu-all.h"
 417 #include "exec-all.h"
 418
 419 static inline int cpu_has_work(CPUState *env)
 420 {
 421     return env->pending_irq_level;
 422 }
 423
 424 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 425 {
 426     env->pc = tb->pc;
 427 }
 428
 429 #endif