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 "fpu/softfloat-types.h" 27 #include "qom/object.h" 28 29 #define TCG_GUEST_DEFAULT_MO 0 30 31 #define TYPE_RISCV_CPU "riscv-cpu" 32 33 #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU 34 #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX) 35 #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU 36 37 #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any") 38 #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32") 39 #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64") 40 #define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex") 41 #define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31") 42 #define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34") 43 #define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51") 44 #define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34") 45 #define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54") 46 47 #if defined(TARGET_RISCV32) 48 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32 49 #elif defined(TARGET_RISCV64) 50 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64 51 #endif 52 53 #define RV32 ((target_ulong)1 << (TARGET_LONG_BITS - 2)) 54 #define RV64 ((target_ulong)2 << (TARGET_LONG_BITS - 2)) 55 56 #if defined(TARGET_RISCV32) 57 #define RVXLEN RV32 58 #elif defined(TARGET_RISCV64) 59 #define RVXLEN RV64 60 #endif 61 62 #define RV(x) ((target_ulong)1 << (x - 'A')) 63 64 #define RVI RV('I') 65 #define RVE RV('E') /* E and I are mutually exclusive */ 66 #define RVM RV('M') 67 #define RVA RV('A') 68 #define RVF RV('F') 69 #define RVD RV('D') 70 #define RVV RV('V') 71 #define RVC RV('C') 72 #define RVS RV('S') 73 #define RVU RV('U') 74 #define RVH RV('H') 75 76 /* S extension denotes that Supervisor mode exists, however it is possible 77 to have a core that support S mode but does not have an MMU and there 78 is currently no bit in misa to indicate whether an MMU exists or not 79 so a cpu features bitfield is required, likewise for optional PMP support */ 80 enum { 81 RISCV_FEATURE_MMU, 82 RISCV_FEATURE_PMP, 83 RISCV_FEATURE_MISA 84 }; 85 86 #define PRIV_VERSION_1_10_0 0x00011000 87 #define PRIV_VERSION_1_11_0 0x00011100 88 89 #define VEXT_VERSION_0_07_1 0x00000701 90 91 enum { 92 TRANSLATE_SUCCESS, 93 TRANSLATE_FAIL, 94 TRANSLATE_PMP_FAIL, 95 TRANSLATE_G_STAGE_FAIL 96 }; 97 98 #define MMU_USER_IDX 3 99 100 #define MAX_RISCV_PMPS (16) 101 102 typedef struct CPURISCVState CPURISCVState; 103 104 #include "pmp.h" 105 106 #define RV_VLEN_MAX 256 107 108 FIELD(VTYPE, VLMUL, 0, 2) 109 FIELD(VTYPE, VSEW, 2, 3) 110 FIELD(VTYPE, VEDIV, 5, 2) 111 FIELD(VTYPE, RESERVED, 7, sizeof(target_ulong) * 8 - 9) 112 FIELD(VTYPE, VILL, sizeof(target_ulong) * 8 - 1, 1) 113 114 struct CPURISCVState { 115 target_ulong gpr[32]; 116 uint64_t fpr[32]; /* assume both F and D extensions */ 117 118 /* vector coprocessor state. */ 119 uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16); 120 target_ulong vxrm; 121 target_ulong vxsat; 122 target_ulong vl; 123 target_ulong vstart; 124 target_ulong vtype; 125 126 target_ulong pc; 127 target_ulong load_res; 128 target_ulong load_val; 129 130 target_ulong frm; 131 132 target_ulong badaddr; 133 target_ulong guest_phys_fault_addr; 134 135 target_ulong priv_ver; 136 target_ulong vext_ver; 137 target_ulong misa; 138 target_ulong misa_mask; 139 140 uint32_t features; 141 142 #ifdef CONFIG_USER_ONLY 143 uint32_t elf_flags; 144 #endif 145 146 #ifndef CONFIG_USER_ONLY 147 target_ulong priv; 148 /* This contains QEMU specific information about the virt state. */ 149 target_ulong virt; 150 target_ulong resetvec; 151 152 target_ulong mhartid; 153 /* 154 * For RV32 this is 32-bit mstatus and 32-bit mstatush. 155 * For RV64 this is a 64-bit mstatus. 156 */ 157 uint64_t mstatus; 158 159 target_ulong mip; 160 161 uint32_t miclaim; 162 163 target_ulong mie; 164 target_ulong mideleg; 165 166 target_ulong sptbr; /* until: priv-1.9.1 */ 167 target_ulong satp; /* since: priv-1.10.0 */ 168 target_ulong sbadaddr; 169 target_ulong mbadaddr; 170 target_ulong medeleg; 171 172 target_ulong stvec; 173 target_ulong sepc; 174 target_ulong scause; 175 176 target_ulong mtvec; 177 target_ulong mepc; 178 target_ulong mcause; 179 target_ulong mtval; /* since: priv-1.10.0 */ 180 181 /* Hypervisor CSRs */ 182 target_ulong hstatus; 183 target_ulong hedeleg; 184 target_ulong hideleg; 185 target_ulong hcounteren; 186 target_ulong htval; 187 target_ulong htinst; 188 target_ulong hgatp; 189 uint64_t htimedelta; 190 191 /* Virtual CSRs */ 192 /* 193 * For RV32 this is 32-bit vsstatus and 32-bit vsstatush. 194 * For RV64 this is a 64-bit vsstatus. 195 */ 196 uint64_t vsstatus; 197 target_ulong vstvec; 198 target_ulong vsscratch; 199 target_ulong vsepc; 200 target_ulong vscause; 201 target_ulong vstval; 202 target_ulong vsatp; 203 204 target_ulong mtval2; 205 target_ulong mtinst; 206 207 /* HS Backup CSRs */ 208 target_ulong stvec_hs; 209 target_ulong sscratch_hs; 210 target_ulong sepc_hs; 211 target_ulong scause_hs; 212 target_ulong stval_hs; 213 target_ulong satp_hs; 214 uint64_t mstatus_hs; 215 216 target_ulong scounteren; 217 target_ulong mcounteren; 218 219 target_ulong sscratch; 220 target_ulong mscratch; 221 222 /* temporary htif regs */ 223 uint64_t mfromhost; 224 uint64_t mtohost; 225 uint64_t timecmp; 226 227 /* physical memory protection */ 228 pmp_table_t pmp_state; 229 230 /* machine specific rdtime callback */ 231 uint64_t (*rdtime_fn)(uint32_t); 232 uint32_t rdtime_fn_arg; 233 234 /* True if in debugger mode. */ 235 bool debugger; 236 #endif 237 238 float_status fp_status; 239 240 /* Fields from here on are preserved across CPU reset. */ 241 QEMUTimer *timer; /* Internal timer */ 242 }; 243 244 OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass, 245 RISCV_CPU) 246 247 /** 248 * RISCVCPUClass: 249 * @parent_realize: The parent class' realize handler. 250 * @parent_reset: The parent class' reset handler. 251 * 252 * A RISCV CPU model. 253 */ 254 struct RISCVCPUClass { 255 /*< private >*/ 256 CPUClass parent_class; 257 /*< public >*/ 258 DeviceRealize parent_realize; 259 DeviceReset parent_reset; 260 }; 261 262 /** 263 * RISCVCPU: 264 * @env: #CPURISCVState 265 * 266 * A RISCV CPU. 267 */ 268 struct RISCVCPU { 269 /*< private >*/ 270 CPUState parent_obj; 271 /*< public >*/ 272 CPUNegativeOffsetState neg; 273 CPURISCVState env; 274 275 /* Configuration Settings */ 276 struct { 277 bool ext_i; 278 bool ext_e; 279 bool ext_g; 280 bool ext_m; 281 bool ext_a; 282 bool ext_f; 283 bool ext_d; 284 bool ext_c; 285 bool ext_s; 286 bool ext_u; 287 bool ext_h; 288 bool ext_v; 289 bool ext_counters; 290 bool ext_ifencei; 291 bool ext_icsr; 292 293 char *priv_spec; 294 char *user_spec; 295 char *vext_spec; 296 uint16_t vlen; 297 uint16_t elen; 298 bool mmu; 299 bool pmp; 300 uint64_t resetvec; 301 } cfg; 302 }; 303 304 static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext) 305 { 306 return (env->misa & ext) != 0; 307 } 308 309 static inline bool riscv_feature(CPURISCVState *env, int feature) 310 { 311 return env->features & (1ULL << feature); 312 } 313 314 #include "cpu_user.h" 315 #include "cpu_bits.h" 316 317 extern const char * const riscv_int_regnames[]; 318 extern const char * const riscv_fpr_regnames[]; 319 extern const char * const riscv_excp_names[]; 320 extern const char * const riscv_intr_names[]; 321 322 const char *riscv_cpu_get_trap_name(target_ulong cause, bool async); 323 void riscv_cpu_do_interrupt(CPUState *cpu); 324 int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); 325 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); 326 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request); 327 bool riscv_cpu_fp_enabled(CPURISCVState *env); 328 bool riscv_cpu_virt_enabled(CPURISCVState *env); 329 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable); 330 bool riscv_cpu_force_hs_excep_enabled(CPURISCVState *env); 331 void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool enable); 332 bool riscv_cpu_two_stage_lookup(int mmu_idx); 333 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch); 334 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); 335 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 336 MMUAccessType access_type, int mmu_idx, 337 uintptr_t retaddr); 338 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 339 MMUAccessType access_type, int mmu_idx, 340 bool probe, uintptr_t retaddr); 341 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 342 vaddr addr, unsigned size, 343 MMUAccessType access_type, 344 int mmu_idx, MemTxAttrs attrs, 345 MemTxResult response, uintptr_t retaddr); 346 char *riscv_isa_string(RISCVCPU *cpu); 347 void riscv_cpu_list(void); 348 349 #define cpu_signal_handler riscv_cpu_signal_handler 350 #define cpu_list riscv_cpu_list 351 #define cpu_mmu_index riscv_cpu_mmu_index 352 353 #ifndef CONFIG_USER_ONLY 354 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env); 355 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts); 356 uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value); 357 #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */ 358 void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t), 359 uint32_t arg); 360 #endif 361 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv); 362 363 void riscv_translate_init(void); 364 int riscv_cpu_signal_handler(int host_signum, void *pinfo, void *puc); 365 void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env, 366 uint32_t exception, uintptr_t pc); 367 368 target_ulong riscv_cpu_get_fflags(CPURISCVState *env); 369 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong); 370 371 #define TB_FLAGS_MMU_MASK 7 372 #define TB_FLAGS_PRIV_MMU_MASK 3 373 #define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2) 374 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS 375 376 typedef CPURISCVState CPUArchState; 377 typedef RISCVCPU ArchCPU; 378 #include "exec/cpu-all.h" 379 380 FIELD(TB_FLAGS, VL_EQ_VLMAX, 2, 1) 381 FIELD(TB_FLAGS, LMUL, 3, 2) 382 FIELD(TB_FLAGS, SEW, 5, 3) 383 FIELD(TB_FLAGS, VILL, 8, 1) 384 /* Is a Hypervisor instruction load/store allowed? */ 385 FIELD(TB_FLAGS, HLSX, 9, 1) 386 387 bool riscv_cpu_is_32bit(CPURISCVState *env); 388 389 /* 390 * A simplification for VLMAX 391 * = (1 << LMUL) * VLEN / (8 * (1 << SEW)) 392 * = (VLEN << LMUL) / (8 << SEW) 393 * = (VLEN << LMUL) >> (SEW + 3) 394 * = VLEN >> (SEW + 3 - LMUL) 395 */ 396 static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype) 397 { 398 uint8_t sew, lmul; 399 400 sew = FIELD_EX64(vtype, VTYPE, VSEW); 401 lmul = FIELD_EX64(vtype, VTYPE, VLMUL); 402 return cpu->cfg.vlen >> (sew + 3 - lmul); 403 } 404 405 static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, 406 target_ulong *cs_base, uint32_t *pflags) 407 { 408 uint32_t flags = 0; 409 410 *pc = env->pc; 411 *cs_base = 0; 412 413 if (riscv_has_ext(env, RVV)) { 414 uint32_t vlmax = vext_get_vlmax(env_archcpu(env), env->vtype); 415 bool vl_eq_vlmax = (env->vstart == 0) && (vlmax == env->vl); 416 flags = FIELD_DP32(flags, TB_FLAGS, VILL, 417 FIELD_EX64(env->vtype, VTYPE, VILL)); 418 flags = FIELD_DP32(flags, TB_FLAGS, SEW, 419 FIELD_EX64(env->vtype, VTYPE, VSEW)); 420 flags = FIELD_DP32(flags, TB_FLAGS, LMUL, 421 FIELD_EX64(env->vtype, VTYPE, VLMUL)); 422 flags = FIELD_DP32(flags, TB_FLAGS, VL_EQ_VLMAX, vl_eq_vlmax); 423 } else { 424 flags = FIELD_DP32(flags, TB_FLAGS, VILL, 1); 425 } 426 427 #ifdef CONFIG_USER_ONLY 428 flags |= TB_FLAGS_MSTATUS_FS; 429 #else 430 flags |= cpu_mmu_index(env, 0); 431 if (riscv_cpu_fp_enabled(env)) { 432 flags |= env->mstatus & MSTATUS_FS; 433 } 434 435 if (riscv_has_ext(env, RVH)) { 436 if (env->priv == PRV_M || 437 (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) || 438 (env->priv == PRV_U && !riscv_cpu_virt_enabled(env) && 439 get_field(env->hstatus, HSTATUS_HU))) { 440 flags = FIELD_DP32(flags, TB_FLAGS, HLSX, 1); 441 } 442 } 443 #endif 444 445 *pflags = flags; 446 } 447 448 int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value, 449 target_ulong new_value, target_ulong write_mask); 450 int riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value, 451 target_ulong new_value, target_ulong write_mask); 452 453 static inline void riscv_csr_write(CPURISCVState *env, int csrno, 454 target_ulong val) 455 { 456 riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS)); 457 } 458 459 static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno) 460 { 461 target_ulong val = 0; 462 riscv_csrrw(env, csrno, &val, 0, 0); 463 return val; 464 } 465 466 typedef int (*riscv_csr_predicate_fn)(CPURISCVState *env, int csrno); 467 typedef int (*riscv_csr_read_fn)(CPURISCVState *env, int csrno, 468 target_ulong *ret_value); 469 typedef int (*riscv_csr_write_fn)(CPURISCVState *env, int csrno, 470 target_ulong new_value); 471 typedef int (*riscv_csr_op_fn)(CPURISCVState *env, int csrno, 472 target_ulong *ret_value, target_ulong new_value, target_ulong write_mask); 473 474 typedef struct { 475 riscv_csr_predicate_fn predicate; 476 riscv_csr_read_fn read; 477 riscv_csr_write_fn write; 478 riscv_csr_op_fn op; 479 } riscv_csr_operations; 480 481 void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops); 482 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops); 483 484 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs); 485 486 #endif /* RISCV_CPU_H */ 487