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