1 /* 2 * QEMU RISC-V CPU 3 * 4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu 5 * Copyright (c) 2017-2018 SiFive, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2 or later, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef RISCV_CPU_H 21 #define RISCV_CPU_H 22 23 #include "hw/core/cpu.h" 24 #include "hw/registerfields.h" 25 #include "exec/cpu-defs.h" 26 #include "qemu/cpu-float.h" 27 #include "qom/object.h" 28 #include "qemu/int128.h" 29 #include "cpu_bits.h" 30 31 #define TCG_GUEST_DEFAULT_MO 0 32 33 /* 34 * RISC-V-specific extra insn start words: 35 * 1: Original instruction opcode 36 */ 37 #define TARGET_INSN_START_EXTRA_WORDS 1 38 39 #define TYPE_RISCV_CPU "riscv-cpu" 40 41 #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU 42 #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX) 43 #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU 44 45 #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any") 46 #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32") 47 #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64") 48 #define TYPE_RISCV_CPU_BASE128 RISCV_CPU_TYPE_NAME("x-rv128") 49 #define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex") 50 #define TYPE_RISCV_CPU_SHAKTI_C RISCV_CPU_TYPE_NAME("shakti-c") 51 #define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31") 52 #define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34") 53 #define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51") 54 #define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34") 55 #define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54") 56 #define TYPE_RISCV_CPU_HOST RISCV_CPU_TYPE_NAME("host") 57 58 #if defined(TARGET_RISCV32) 59 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32 60 #elif defined(TARGET_RISCV64) 61 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64 62 #endif 63 64 #define RV(x) ((target_ulong)1 << (x - 'A')) 65 66 #define RVI RV('I') 67 #define RVE RV('E') /* E and I are mutually exclusive */ 68 #define RVM RV('M') 69 #define RVA RV('A') 70 #define RVF RV('F') 71 #define RVD RV('D') 72 #define RVV RV('V') 73 #define RVC RV('C') 74 #define RVS RV('S') 75 #define RVU RV('U') 76 #define RVH RV('H') 77 #define RVJ RV('J') 78 79 /* S extension denotes that Supervisor mode exists, however it is possible 80 to have a core that support S mode but does not have an MMU and there 81 is currently no bit in misa to indicate whether an MMU exists or not 82 so a cpu features bitfield is required, likewise for optional PMP support */ 83 enum { 84 RISCV_FEATURE_MMU, 85 RISCV_FEATURE_PMP, 86 RISCV_FEATURE_EPMP, 87 RISCV_FEATURE_MISA, 88 RISCV_FEATURE_DEBUG 89 }; 90 91 /* Privileged specification version */ 92 enum { 93 PRIV_VERSION_1_10_0 = 0, 94 PRIV_VERSION_1_11_0, 95 PRIV_VERSION_1_12_0, 96 }; 97 98 #define VEXT_VERSION_1_00_0 0x00010000 99 100 enum { 101 TRANSLATE_SUCCESS, 102 TRANSLATE_FAIL, 103 TRANSLATE_PMP_FAIL, 104 TRANSLATE_G_STAGE_FAIL 105 }; 106 107 #define MMU_USER_IDX 3 108 109 #define MAX_RISCV_PMPS (16) 110 111 typedef struct CPUArchState CPURISCVState; 112 113 #if !defined(CONFIG_USER_ONLY) 114 #include "pmp.h" 115 #include "debug.h" 116 #endif 117 118 #define RV_VLEN_MAX 1024 119 #define RV_MAX_MHPMEVENTS 32 120 #define RV_MAX_MHPMCOUNTERS 32 121 122 FIELD(VTYPE, VLMUL, 0, 3) 123 FIELD(VTYPE, VSEW, 3, 3) 124 FIELD(VTYPE, VTA, 6, 1) 125 FIELD(VTYPE, VMA, 7, 1) 126 FIELD(VTYPE, VEDIV, 8, 2) 127 FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11) 128 129 typedef struct PMUCTRState { 130 /* Current value of a counter */ 131 target_ulong mhpmcounter_val; 132 /* Current value of a counter in RV32*/ 133 target_ulong mhpmcounterh_val; 134 /* Snapshot values of counter */ 135 target_ulong mhpmcounter_prev; 136 /* Snapshort value of a counter in RV32 */ 137 target_ulong mhpmcounterh_prev; 138 bool started; 139 /* Value beyond UINT32_MAX/UINT64_MAX before overflow interrupt trigger */ 140 target_ulong irq_overflow_left; 141 } PMUCTRState; 142 143 struct CPUArchState { 144 target_ulong gpr[32]; 145 target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */ 146 uint64_t fpr[32]; /* assume both F and D extensions */ 147 148 /* vector coprocessor state. */ 149 uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16); 150 target_ulong vxrm; 151 target_ulong vxsat; 152 target_ulong vl; 153 target_ulong vstart; 154 target_ulong vtype; 155 bool vill; 156 157 target_ulong pc; 158 target_ulong load_res; 159 target_ulong load_val; 160 161 target_ulong frm; 162 163 target_ulong badaddr; 164 target_ulong bins; 165 166 target_ulong guest_phys_fault_addr; 167 168 target_ulong priv_ver; 169 target_ulong bext_ver; 170 target_ulong vext_ver; 171 172 /* RISCVMXL, but uint32_t for vmstate migration */ 173 uint32_t misa_mxl; /* current mxl */ 174 uint32_t misa_mxl_max; /* max mxl for this cpu */ 175 uint32_t misa_ext; /* current extensions */ 176 uint32_t misa_ext_mask; /* max ext for this cpu */ 177 uint32_t xl; /* current xlen */ 178 179 /* 128-bit helpers upper part return value */ 180 target_ulong retxh; 181 182 uint32_t features; 183 184 #ifdef CONFIG_USER_ONLY 185 uint32_t elf_flags; 186 #endif 187 188 #ifndef CONFIG_USER_ONLY 189 target_ulong priv; 190 /* This contains QEMU specific information about the virt state. */ 191 target_ulong virt; 192 target_ulong geilen; 193 uint64_t resetvec; 194 195 target_ulong mhartid; 196 /* 197 * For RV32 this is 32-bit mstatus and 32-bit mstatush. 198 * For RV64 this is a 64-bit mstatus. 199 */ 200 uint64_t mstatus; 201 202 uint64_t mip; 203 /* 204 * MIP contains the software writable version of SEIP ORed with the 205 * external interrupt value. The MIP register is always up-to-date. 206 * To keep track of the current source, we also save booleans of the values 207 * here. 208 */ 209 bool external_seip; 210 bool software_seip; 211 212 uint64_t miclaim; 213 214 uint64_t mie; 215 uint64_t mideleg; 216 217 target_ulong satp; /* since: priv-1.10.0 */ 218 target_ulong stval; 219 target_ulong medeleg; 220 221 target_ulong stvec; 222 target_ulong sepc; 223 target_ulong scause; 224 225 target_ulong mtvec; 226 target_ulong mepc; 227 target_ulong mcause; 228 target_ulong mtval; /* since: priv-1.10.0 */ 229 230 /* Machine and Supervisor interrupt priorities */ 231 uint8_t miprio[64]; 232 uint8_t siprio[64]; 233 234 /* AIA CSRs */ 235 target_ulong miselect; 236 target_ulong siselect; 237 238 /* Hypervisor CSRs */ 239 target_ulong hstatus; 240 target_ulong hedeleg; 241 uint64_t hideleg; 242 target_ulong hcounteren; 243 target_ulong htval; 244 target_ulong htinst; 245 target_ulong hgatp; 246 target_ulong hgeie; 247 target_ulong hgeip; 248 uint64_t htimedelta; 249 250 /* Hypervisor controlled virtual interrupt priorities */ 251 target_ulong hvictl; 252 uint8_t hviprio[64]; 253 254 /* Upper 64-bits of 128-bit CSRs */ 255 uint64_t mscratchh; 256 uint64_t sscratchh; 257 258 /* Virtual CSRs */ 259 /* 260 * For RV32 this is 32-bit vsstatus and 32-bit vsstatush. 261 * For RV64 this is a 64-bit vsstatus. 262 */ 263 uint64_t vsstatus; 264 target_ulong vstvec; 265 target_ulong vsscratch; 266 target_ulong vsepc; 267 target_ulong vscause; 268 target_ulong vstval; 269 target_ulong vsatp; 270 271 /* AIA VS-mode CSRs */ 272 target_ulong vsiselect; 273 274 target_ulong mtval2; 275 target_ulong mtinst; 276 277 /* HS Backup CSRs */ 278 target_ulong stvec_hs; 279 target_ulong sscratch_hs; 280 target_ulong sepc_hs; 281 target_ulong scause_hs; 282 target_ulong stval_hs; 283 target_ulong satp_hs; 284 uint64_t mstatus_hs; 285 286 /* Signals whether the current exception occurred with two-stage address 287 translation active. */ 288 bool two_stage_lookup; 289 /* 290 * Signals whether the current exception occurred while doing two-stage 291 * address translation for the VS-stage page table walk. 292 */ 293 bool two_stage_indirect_lookup; 294 295 target_ulong scounteren; 296 target_ulong mcounteren; 297 298 target_ulong mcountinhibit; 299 300 /* PMU counter state */ 301 PMUCTRState pmu_ctrs[RV_MAX_MHPMCOUNTERS]; 302 303 /* PMU event selector configured values. First three are unused*/ 304 target_ulong mhpmevent_val[RV_MAX_MHPMEVENTS]; 305 306 /* PMU event selector configured values for RV32*/ 307 target_ulong mhpmeventh_val[RV_MAX_MHPMEVENTS]; 308 309 target_ulong sscratch; 310 target_ulong mscratch; 311 312 /* temporary htif regs */ 313 uint64_t mfromhost; 314 uint64_t mtohost; 315 316 /* Sstc CSRs */ 317 uint64_t stimecmp; 318 319 uint64_t vstimecmp; 320 321 /* physical memory protection */ 322 pmp_table_t pmp_state; 323 target_ulong mseccfg; 324 325 /* trigger module */ 326 target_ulong trigger_cur; 327 type2_trigger_t type2_trig[TRIGGER_TYPE2_NUM]; 328 329 /* machine specific rdtime callback */ 330 uint64_t (*rdtime_fn)(void *); 331 void *rdtime_fn_arg; 332 333 /* machine specific AIA ireg read-modify-write callback */ 334 #define AIA_MAKE_IREG(__isel, __priv, __virt, __vgein, __xlen) \ 335 ((((__xlen) & 0xff) << 24) | \ 336 (((__vgein) & 0x3f) << 20) | \ 337 (((__virt) & 0x1) << 18) | \ 338 (((__priv) & 0x3) << 16) | \ 339 (__isel & 0xffff)) 340 #define AIA_IREG_ISEL(__ireg) ((__ireg) & 0xffff) 341 #define AIA_IREG_PRIV(__ireg) (((__ireg) >> 16) & 0x3) 342 #define AIA_IREG_VIRT(__ireg) (((__ireg) >> 18) & 0x1) 343 #define AIA_IREG_VGEIN(__ireg) (((__ireg) >> 20) & 0x3f) 344 #define AIA_IREG_XLEN(__ireg) (((__ireg) >> 24) & 0xff) 345 int (*aia_ireg_rmw_fn[4])(void *arg, target_ulong reg, 346 target_ulong *val, target_ulong new_val, target_ulong write_mask); 347 void *aia_ireg_rmw_fn_arg[4]; 348 349 /* True if in debugger mode. */ 350 bool debugger; 351 352 /* 353 * CSRs for PointerMasking extension 354 */ 355 target_ulong mmte; 356 target_ulong mpmmask; 357 target_ulong mpmbase; 358 target_ulong spmmask; 359 target_ulong spmbase; 360 target_ulong upmmask; 361 target_ulong upmbase; 362 363 /* CSRs for execution enviornment configuration */ 364 uint64_t menvcfg; 365 target_ulong senvcfg; 366 uint64_t henvcfg; 367 #endif 368 target_ulong cur_pmmask; 369 target_ulong cur_pmbase; 370 371 float_status fp_status; 372 373 /* Fields from here on are preserved across CPU reset. */ 374 QEMUTimer *stimer; /* Internal timer for S-mode interrupt */ 375 QEMUTimer *vstimer; /* Internal timer for VS-mode interrupt */ 376 bool vstime_irq; 377 378 hwaddr kernel_addr; 379 hwaddr fdt_addr; 380 381 /* kvm timer */ 382 bool kvm_timer_dirty; 383 uint64_t kvm_timer_time; 384 uint64_t kvm_timer_compare; 385 uint64_t kvm_timer_state; 386 uint64_t kvm_timer_frequency; 387 }; 388 389 OBJECT_DECLARE_CPU_TYPE(RISCVCPU, RISCVCPUClass, RISCV_CPU) 390 391 /** 392 * RISCVCPUClass: 393 * @parent_realize: The parent class' realize handler. 394 * @parent_reset: The parent class' reset handler. 395 * 396 * A RISCV CPU model. 397 */ 398 struct RISCVCPUClass { 399 /*< private >*/ 400 CPUClass parent_class; 401 /*< public >*/ 402 DeviceRealize parent_realize; 403 DeviceReset parent_reset; 404 }; 405 406 struct RISCVCPUConfig { 407 bool ext_i; 408 bool ext_e; 409 bool ext_g; 410 bool ext_m; 411 bool ext_a; 412 bool ext_f; 413 bool ext_d; 414 bool ext_c; 415 bool ext_s; 416 bool ext_u; 417 bool ext_h; 418 bool ext_j; 419 bool ext_v; 420 bool ext_zba; 421 bool ext_zbb; 422 bool ext_zbc; 423 bool ext_zbkb; 424 bool ext_zbkc; 425 bool ext_zbkx; 426 bool ext_zbs; 427 bool ext_zk; 428 bool ext_zkn; 429 bool ext_zknd; 430 bool ext_zkne; 431 bool ext_zknh; 432 bool ext_zkr; 433 bool ext_zks; 434 bool ext_zksed; 435 bool ext_zksh; 436 bool ext_zkt; 437 bool ext_ifencei; 438 bool ext_icsr; 439 bool ext_zihintpause; 440 bool ext_sstc; 441 bool ext_svinval; 442 bool ext_svnapot; 443 bool ext_svpbmt; 444 bool ext_zdinx; 445 bool ext_zfh; 446 bool ext_zfhmin; 447 bool ext_zfinx; 448 bool ext_zhinx; 449 bool ext_zhinxmin; 450 bool ext_zve32f; 451 bool ext_zve64f; 452 bool ext_zmmul; 453 bool ext_smaia; 454 bool ext_ssaia; 455 bool ext_sscofpmf; 456 bool rvv_ta_all_1s; 457 bool rvv_ma_all_1s; 458 459 uint32_t mvendorid; 460 uint64_t marchid; 461 uint64_t mimpid; 462 463 /* Vendor-specific custom extensions */ 464 bool ext_XVentanaCondOps; 465 466 uint8_t pmu_num; 467 char *priv_spec; 468 char *user_spec; 469 char *bext_spec; 470 char *vext_spec; 471 uint16_t vlen; 472 uint16_t elen; 473 bool mmu; 474 bool pmp; 475 bool epmp; 476 bool debug; 477 478 bool short_isa_string; 479 }; 480 481 typedef struct RISCVCPUConfig RISCVCPUConfig; 482 483 /** 484 * RISCVCPU: 485 * @env: #CPURISCVState 486 * 487 * A RISCV CPU. 488 */ 489 struct ArchCPU { 490 /*< private >*/ 491 CPUState parent_obj; 492 /*< public >*/ 493 CPUNegativeOffsetState neg; 494 CPURISCVState env; 495 496 char *dyn_csr_xml; 497 char *dyn_vreg_xml; 498 499 /* Configuration Settings */ 500 RISCVCPUConfig cfg; 501 502 QEMUTimer *pmu_timer; 503 /* A bitmask of Available programmable counters */ 504 uint32_t pmu_avail_ctrs; 505 /* Mapping of events to counters */ 506 GHashTable *pmu_event_ctr_map; 507 }; 508 509 static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext) 510 { 511 return (env->misa_ext & ext) != 0; 512 } 513 514 static inline bool riscv_feature(CPURISCVState *env, int feature) 515 { 516 return env->features & (1ULL << feature); 517 } 518 519 static inline void riscv_set_feature(CPURISCVState *env, int feature) 520 { 521 env->features |= (1ULL << feature); 522 } 523 524 #include "cpu_user.h" 525 526 extern const char * const riscv_int_regnames[]; 527 extern const char * const riscv_int_regnamesh[]; 528 extern const char * const riscv_fpr_regnames[]; 529 530 const char *riscv_cpu_get_trap_name(target_ulong cause, bool async); 531 void riscv_cpu_do_interrupt(CPUState *cpu); 532 int riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs, 533 int cpuid, void *opaque); 534 int riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs, 535 int cpuid, void *opaque); 536 int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); 537 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); 538 int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero); 539 uint8_t riscv_cpu_default_priority(int irq); 540 uint64_t riscv_cpu_all_pending(CPURISCVState *env); 541 int riscv_cpu_mirq_pending(CPURISCVState *env); 542 int riscv_cpu_sirq_pending(CPURISCVState *env); 543 int riscv_cpu_vsirq_pending(CPURISCVState *env); 544 bool riscv_cpu_fp_enabled(CPURISCVState *env); 545 target_ulong riscv_cpu_get_geilen(CPURISCVState *env); 546 void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen); 547 bool riscv_cpu_vector_enabled(CPURISCVState *env); 548 bool riscv_cpu_virt_enabled(CPURISCVState *env); 549 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable); 550 bool riscv_cpu_two_stage_lookup(int mmu_idx); 551 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch); 552 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); 553 G_NORETURN void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 554 MMUAccessType access_type, int mmu_idx, 555 uintptr_t retaddr); 556 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 557 MMUAccessType access_type, int mmu_idx, 558 bool probe, uintptr_t retaddr); 559 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 560 vaddr addr, unsigned size, 561 MMUAccessType access_type, 562 int mmu_idx, MemTxAttrs attrs, 563 MemTxResult response, uintptr_t retaddr); 564 char *riscv_isa_string(RISCVCPU *cpu); 565 void riscv_cpu_list(void); 566 567 #define cpu_list riscv_cpu_list 568 #define cpu_mmu_index riscv_cpu_mmu_index 569 570 #ifndef CONFIG_USER_ONLY 571 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request); 572 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env); 573 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts); 574 uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t mask, uint64_t value); 575 #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */ 576 void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void *), 577 void *arg); 578 void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv, 579 int (*rmw_fn)(void *arg, 580 target_ulong reg, 581 target_ulong *val, 582 target_ulong new_val, 583 target_ulong write_mask), 584 void *rmw_fn_arg); 585 #endif 586 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv); 587 588 void riscv_translate_init(void); 589 G_NORETURN void riscv_raise_exception(CPURISCVState *env, 590 uint32_t exception, uintptr_t pc); 591 592 target_ulong riscv_cpu_get_fflags(CPURISCVState *env); 593 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong); 594 595 #define TB_FLAGS_PRIV_MMU_MASK 3 596 #define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2) 597 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS 598 #define TB_FLAGS_MSTATUS_VS MSTATUS_VS 599 600 #include "exec/cpu-all.h" 601 602 FIELD(TB_FLAGS, MEM_IDX, 0, 3) 603 FIELD(TB_FLAGS, LMUL, 3, 3) 604 FIELD(TB_FLAGS, SEW, 6, 3) 605 /* Skip MSTATUS_VS (0x600) bits */ 606 FIELD(TB_FLAGS, VL_EQ_VLMAX, 11, 1) 607 FIELD(TB_FLAGS, VILL, 12, 1) 608 /* Skip MSTATUS_FS (0x6000) bits */ 609 /* Is a Hypervisor instruction load/store allowed? */ 610 FIELD(TB_FLAGS, HLSX, 15, 1) 611 FIELD(TB_FLAGS, MSTATUS_HS_FS, 16, 2) 612 FIELD(TB_FLAGS, MSTATUS_HS_VS, 18, 2) 613 /* The combination of MXL/SXL/UXL that applies to the current cpu mode. */ 614 FIELD(TB_FLAGS, XL, 20, 2) 615 /* If PointerMasking should be applied */ 616 FIELD(TB_FLAGS, PM_MASK_ENABLED, 22, 1) 617 FIELD(TB_FLAGS, PM_BASE_ENABLED, 23, 1) 618 FIELD(TB_FLAGS, VTA, 24, 1) 619 FIELD(TB_FLAGS, VMA, 25, 1) 620 621 #ifdef TARGET_RISCV32 622 #define riscv_cpu_mxl(env) ((void)(env), MXL_RV32) 623 #else 624 static inline RISCVMXL riscv_cpu_mxl(CPURISCVState *env) 625 { 626 return env->misa_mxl; 627 } 628 #endif 629 #define riscv_cpu_mxl_bits(env) (1UL << (4 + riscv_cpu_mxl(env))) 630 631 #if defined(TARGET_RISCV32) 632 #define cpu_recompute_xl(env) ((void)(env), MXL_RV32) 633 #else 634 static inline RISCVMXL cpu_recompute_xl(CPURISCVState *env) 635 { 636 RISCVMXL xl = env->misa_mxl; 637 #if !defined(CONFIG_USER_ONLY) 638 /* 639 * When emulating a 32-bit-only cpu, use RV32. 640 * When emulating a 64-bit cpu, and MXL has been reduced to RV32, 641 * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened 642 * back to RV64 for lower privs. 643 */ 644 if (xl != MXL_RV32) { 645 switch (env->priv) { 646 case PRV_M: 647 break; 648 case PRV_U: 649 xl = get_field(env->mstatus, MSTATUS64_UXL); 650 break; 651 default: /* PRV_S | PRV_H */ 652 xl = get_field(env->mstatus, MSTATUS64_SXL); 653 break; 654 } 655 } 656 #endif 657 return xl; 658 } 659 #endif 660 661 static inline int riscv_cpu_xlen(CPURISCVState *env) 662 { 663 return 16 << env->xl; 664 } 665 666 #ifdef TARGET_RISCV32 667 #define riscv_cpu_sxl(env) ((void)(env), MXL_RV32) 668 #else 669 static inline RISCVMXL riscv_cpu_sxl(CPURISCVState *env) 670 { 671 #ifdef CONFIG_USER_ONLY 672 return env->misa_mxl; 673 #else 674 return get_field(env->mstatus, MSTATUS64_SXL); 675 #endif 676 } 677 #endif 678 679 /* 680 * Encode LMUL to lmul as follows: 681 * LMUL vlmul lmul 682 * 1 000 0 683 * 2 001 1 684 * 4 010 2 685 * 8 011 3 686 * - 100 - 687 * 1/8 101 -3 688 * 1/4 110 -2 689 * 1/2 111 -1 690 * 691 * then, we can calculate VLMAX = vlen >> (vsew + 3 - lmul) 692 * e.g. vlen = 256 bits, SEW = 16, LMUL = 1/8 693 * => VLMAX = vlen >> (1 + 3 - (-3)) 694 * = 256 >> 7 695 * = 2 696 */ 697 static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype) 698 { 699 uint8_t sew = FIELD_EX64(vtype, VTYPE, VSEW); 700 int8_t lmul = sextract32(FIELD_EX64(vtype, VTYPE, VLMUL), 0, 3); 701 return cpu->cfg.vlen >> (sew + 3 - lmul); 702 } 703 704 void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, 705 target_ulong *cs_base, uint32_t *pflags); 706 707 void riscv_cpu_update_mask(CPURISCVState *env); 708 709 RISCVException riscv_csrrw(CPURISCVState *env, int csrno, 710 target_ulong *ret_value, 711 target_ulong new_value, target_ulong write_mask); 712 RISCVException riscv_csrrw_debug(CPURISCVState *env, int csrno, 713 target_ulong *ret_value, 714 target_ulong new_value, 715 target_ulong write_mask); 716 717 static inline void riscv_csr_write(CPURISCVState *env, int csrno, 718 target_ulong val) 719 { 720 riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS)); 721 } 722 723 static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno) 724 { 725 target_ulong val = 0; 726 riscv_csrrw(env, csrno, &val, 0, 0); 727 return val; 728 } 729 730 typedef RISCVException (*riscv_csr_predicate_fn)(CPURISCVState *env, 731 int csrno); 732 typedef RISCVException (*riscv_csr_read_fn)(CPURISCVState *env, int csrno, 733 target_ulong *ret_value); 734 typedef RISCVException (*riscv_csr_write_fn)(CPURISCVState *env, int csrno, 735 target_ulong new_value); 736 typedef RISCVException (*riscv_csr_op_fn)(CPURISCVState *env, int csrno, 737 target_ulong *ret_value, 738 target_ulong new_value, 739 target_ulong write_mask); 740 741 RISCVException riscv_csrrw_i128(CPURISCVState *env, int csrno, 742 Int128 *ret_value, 743 Int128 new_value, Int128 write_mask); 744 745 typedef RISCVException (*riscv_csr_read128_fn)(CPURISCVState *env, int csrno, 746 Int128 *ret_value); 747 typedef RISCVException (*riscv_csr_write128_fn)(CPURISCVState *env, int csrno, 748 Int128 new_value); 749 750 typedef struct { 751 const char *name; 752 riscv_csr_predicate_fn predicate; 753 riscv_csr_read_fn read; 754 riscv_csr_write_fn write; 755 riscv_csr_op_fn op; 756 riscv_csr_read128_fn read128; 757 riscv_csr_write128_fn write128; 758 /* The default priv spec version should be PRIV_VERSION_1_10_0 (i.e 0) */ 759 uint32_t min_priv_ver; 760 } riscv_csr_operations; 761 762 /* CSR function table constants */ 763 enum { 764 CSR_TABLE_SIZE = 0x1000 765 }; 766 767 /** 768 * The event id are encoded based on the encoding specified in the 769 * SBI specification v0.3 770 */ 771 772 enum riscv_pmu_event_idx { 773 RISCV_PMU_EVENT_HW_CPU_CYCLES = 0x01, 774 RISCV_PMU_EVENT_HW_INSTRUCTIONS = 0x02, 775 RISCV_PMU_EVENT_CACHE_DTLB_READ_MISS = 0x10019, 776 RISCV_PMU_EVENT_CACHE_DTLB_WRITE_MISS = 0x1001B, 777 RISCV_PMU_EVENT_CACHE_ITLB_PREFETCH_MISS = 0x10021, 778 }; 779 780 /* CSR function table */ 781 extern riscv_csr_operations csr_ops[CSR_TABLE_SIZE]; 782 783 void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops); 784 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops); 785 786 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs); 787 788 #endif /* RISCV_CPU_H */ 789