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 "exec/cpu-defs.h" 25 #include "fpu/softfloat-types.h" 26 27 #define TCG_GUEST_DEFAULT_MO 0 28 29 #define TYPE_RISCV_CPU "riscv-cpu" 30 31 #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU 32 #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX) 33 #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU 34 35 #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any") 36 #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32") 37 #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64") 38 #define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31") 39 #define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51") 40 #define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34") 41 #define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54") 42 /* Deprecated */ 43 #define TYPE_RISCV_CPU_RV32IMACU_NOMMU RISCV_CPU_TYPE_NAME("rv32imacu-nommu") 44 #define TYPE_RISCV_CPU_RV32GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.9.1") 45 #define TYPE_RISCV_CPU_RV32GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv32gcsu-v1.10.0") 46 #define TYPE_RISCV_CPU_RV64IMACU_NOMMU RISCV_CPU_TYPE_NAME("rv64imacu-nommu") 47 #define TYPE_RISCV_CPU_RV64GCSU_V1_09_1 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.9.1") 48 #define TYPE_RISCV_CPU_RV64GCSU_V1_10_0 RISCV_CPU_TYPE_NAME("rv64gcsu-v1.10.0") 49 50 #define RV32 ((target_ulong)1 << (TARGET_LONG_BITS - 2)) 51 #define RV64 ((target_ulong)2 << (TARGET_LONG_BITS - 2)) 52 53 #if defined(TARGET_RISCV32) 54 #define RVXLEN RV32 55 #elif defined(TARGET_RISCV64) 56 #define RVXLEN RV64 57 #endif 58 59 #define RV(x) ((target_ulong)1 << (x - 'A')) 60 61 #define RVI RV('I') 62 #define RVE RV('E') /* E and I are mutually exclusive */ 63 #define RVM RV('M') 64 #define RVA RV('A') 65 #define RVF RV('F') 66 #define RVD RV('D') 67 #define RVC RV('C') 68 #define RVS RV('S') 69 #define RVU RV('U') 70 71 /* S extension denotes that Supervisor mode exists, however it is possible 72 to have a core that support S mode but does not have an MMU and there 73 is currently no bit in misa to indicate whether an MMU exists or not 74 so a cpu features bitfield is required, likewise for optional PMP support */ 75 enum { 76 RISCV_FEATURE_MMU, 77 RISCV_FEATURE_PMP, 78 RISCV_FEATURE_MISA 79 }; 80 81 #define PRIV_VERSION_1_09_1 0x00010901 82 #define PRIV_VERSION_1_10_0 0x00011000 83 #define PRIV_VERSION_1_11_0 0x00011100 84 85 #define TRANSLATE_PMP_FAIL 2 86 #define TRANSLATE_FAIL 1 87 #define TRANSLATE_SUCCESS 0 88 #define MMU_USER_IDX 3 89 90 #define MAX_RISCV_PMPS (16) 91 92 typedef struct CPURISCVState CPURISCVState; 93 94 #include "pmp.h" 95 96 struct CPURISCVState { 97 target_ulong gpr[32]; 98 uint64_t fpr[32]; /* assume both F and D extensions */ 99 target_ulong pc; 100 target_ulong load_res; 101 target_ulong load_val; 102 103 target_ulong frm; 104 105 target_ulong badaddr; 106 107 target_ulong priv_ver; 108 target_ulong misa; 109 target_ulong misa_mask; 110 111 uint32_t features; 112 113 #ifdef CONFIG_USER_ONLY 114 uint32_t elf_flags; 115 #endif 116 117 #ifndef CONFIG_USER_ONLY 118 target_ulong priv; 119 target_ulong resetvec; 120 121 target_ulong mhartid; 122 target_ulong mstatus; 123 124 /* 125 * CAUTION! Unlike the rest of this struct, mip is accessed asynchonously 126 * by I/O threads. It should be read with atomic_read. It should be updated 127 * using riscv_cpu_update_mip with the iothread mutex held. The iothread 128 * mutex must be held because mip must be consistent with the CPU inturrept 129 * state. riscv_cpu_update_mip calls cpu_interrupt or cpu_reset_interrupt 130 * wuth the invariant that CPU_INTERRUPT_HARD is set iff mip is non-zero. 131 * mip is 32-bits to allow atomic_read on 32-bit hosts. 132 */ 133 uint32_t mip; 134 uint32_t miclaim; 135 136 target_ulong mie; 137 target_ulong mideleg; 138 139 target_ulong sptbr; /* until: priv-1.9.1 */ 140 target_ulong satp; /* since: priv-1.10.0 */ 141 target_ulong sbadaddr; 142 target_ulong mbadaddr; 143 target_ulong medeleg; 144 145 target_ulong stvec; 146 target_ulong sepc; 147 target_ulong scause; 148 149 target_ulong mtvec; 150 target_ulong mepc; 151 target_ulong mcause; 152 target_ulong mtval; /* since: priv-1.10.0 */ 153 154 target_ulong scounteren; 155 target_ulong mcounteren; 156 157 target_ulong sscratch; 158 target_ulong mscratch; 159 160 /* temporary htif regs */ 161 uint64_t mfromhost; 162 uint64_t mtohost; 163 uint64_t timecmp; 164 165 /* physical memory protection */ 166 pmp_table_t pmp_state; 167 168 /* True if in debugger mode. */ 169 bool debugger; 170 #endif 171 172 float_status fp_status; 173 174 /* Fields from here on are preserved across CPU reset. */ 175 QEMUTimer *timer; /* Internal timer */ 176 }; 177 178 #define RISCV_CPU_CLASS(klass) \ 179 OBJECT_CLASS_CHECK(RISCVCPUClass, (klass), TYPE_RISCV_CPU) 180 #define RISCV_CPU(obj) \ 181 OBJECT_CHECK(RISCVCPU, (obj), TYPE_RISCV_CPU) 182 #define RISCV_CPU_GET_CLASS(obj) \ 183 OBJECT_GET_CLASS(RISCVCPUClass, (obj), TYPE_RISCV_CPU) 184 185 /** 186 * RISCVCPUClass: 187 * @parent_realize: The parent class' realize handler. 188 * @parent_reset: The parent class' reset handler. 189 * 190 * A RISCV CPU model. 191 */ 192 typedef struct RISCVCPUClass { 193 /*< private >*/ 194 CPUClass parent_class; 195 /*< public >*/ 196 DeviceRealize parent_realize; 197 void (*parent_reset)(CPUState *cpu); 198 } RISCVCPUClass; 199 200 /** 201 * RISCVCPU: 202 * @env: #CPURISCVState 203 * 204 * A RISCV CPU. 205 */ 206 typedef struct RISCVCPU { 207 /*< private >*/ 208 CPUState parent_obj; 209 /*< public >*/ 210 CPUNegativeOffsetState neg; 211 CPURISCVState env; 212 213 /* Configuration Settings */ 214 struct { 215 bool ext_i; 216 bool ext_e; 217 bool ext_g; 218 bool ext_m; 219 bool ext_a; 220 bool ext_f; 221 bool ext_d; 222 bool ext_c; 223 bool ext_s; 224 bool ext_u; 225 bool ext_counters; 226 bool ext_ifencei; 227 bool ext_icsr; 228 229 char *priv_spec; 230 char *user_spec; 231 bool mmu; 232 bool pmp; 233 } cfg; 234 } RISCVCPU; 235 236 static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext) 237 { 238 return (env->misa & ext) != 0; 239 } 240 241 static inline bool riscv_feature(CPURISCVState *env, int feature) 242 { 243 return env->features & (1ULL << feature); 244 } 245 246 #include "cpu_user.h" 247 #include "cpu_bits.h" 248 249 extern const char * const riscv_int_regnames[]; 250 extern const char * const riscv_fpr_regnames[]; 251 extern const char * const riscv_excp_names[]; 252 extern const char * const riscv_intr_names[]; 253 254 void riscv_cpu_do_interrupt(CPUState *cpu); 255 int riscv_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg); 256 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); 257 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request); 258 bool riscv_cpu_fp_enabled(CPURISCVState *env); 259 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch); 260 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); 261 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 262 MMUAccessType access_type, int mmu_idx, 263 uintptr_t retaddr); 264 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 265 MMUAccessType access_type, int mmu_idx, 266 bool probe, uintptr_t retaddr); 267 void riscv_cpu_unassigned_access(CPUState *cpu, hwaddr addr, bool is_write, 268 bool is_exec, int unused, unsigned size); 269 char *riscv_isa_string(RISCVCPU *cpu); 270 void riscv_cpu_list(void); 271 272 #define cpu_signal_handler riscv_cpu_signal_handler 273 #define cpu_list riscv_cpu_list 274 #define cpu_mmu_index riscv_cpu_mmu_index 275 276 #ifndef CONFIG_USER_ONLY 277 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts); 278 uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value); 279 #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */ 280 #endif 281 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv); 282 283 void riscv_translate_init(void); 284 int riscv_cpu_signal_handler(int host_signum, void *pinfo, void *puc); 285 void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env, 286 uint32_t exception, uintptr_t pc); 287 288 target_ulong riscv_cpu_get_fflags(CPURISCVState *env); 289 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong); 290 291 #define TB_FLAGS_MMU_MASK 3 292 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS 293 294 static inline void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, 295 target_ulong *cs_base, uint32_t *flags) 296 { 297 *pc = env->pc; 298 *cs_base = 0; 299 #ifdef CONFIG_USER_ONLY 300 *flags = TB_FLAGS_MSTATUS_FS; 301 #else 302 *flags = cpu_mmu_index(env, 0); 303 if (riscv_cpu_fp_enabled(env)) { 304 *flags |= TB_FLAGS_MSTATUS_FS; 305 } 306 #endif 307 } 308 309 int riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value, 310 target_ulong new_value, target_ulong write_mask); 311 int riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value, 312 target_ulong new_value, target_ulong write_mask); 313 314 static inline void riscv_csr_write(CPURISCVState *env, int csrno, 315 target_ulong val) 316 { 317 riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS)); 318 } 319 320 static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno) 321 { 322 target_ulong val = 0; 323 riscv_csrrw(env, csrno, &val, 0, 0); 324 return val; 325 } 326 327 typedef int (*riscv_csr_predicate_fn)(CPURISCVState *env, int csrno); 328 typedef int (*riscv_csr_read_fn)(CPURISCVState *env, int csrno, 329 target_ulong *ret_value); 330 typedef int (*riscv_csr_write_fn)(CPURISCVState *env, int csrno, 331 target_ulong new_value); 332 typedef int (*riscv_csr_op_fn)(CPURISCVState *env, int csrno, 333 target_ulong *ret_value, target_ulong new_value, target_ulong write_mask); 334 335 typedef struct { 336 riscv_csr_predicate_fn predicate; 337 riscv_csr_read_fn read; 338 riscv_csr_write_fn write; 339 riscv_csr_op_fn op; 340 } riscv_csr_operations; 341 342 void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops); 343 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops); 344 345 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs); 346 347 typedef CPURISCVState CPUArchState; 348 typedef RISCVCPU ArchCPU; 349 350 #include "exec/cpu-all.h" 351 352 #endif /* RISCV_CPU_H */ 353