5 * Copyright (c) 2017-2018 SiFive, Inc.
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.
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
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/>.
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 #include "qemu/int128.h"
31 #define TCG_GUEST_DEFAULT_MO 0
33 #define TYPE_RISCV_CPU "riscv-cpu"
35 #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU
36 #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX)
37 #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU
39 #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any")
40 #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32")
41 #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64")
42 #define TYPE_RISCV_CPU_BASE128 RISCV_CPU_TYPE_NAME("x-rv128")
43 #define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex")
44 #define TYPE_RISCV_CPU_SHAKTI_C RISCV_CPU_TYPE_NAME("shakti-c")
45 #define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31")
46 #define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34")
47 #define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51")
48 #define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34")
49 #define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54")
50 #define TYPE_RISCV_CPU_HOST RISCV_CPU_TYPE_NAME("host")
52 #if defined(TARGET_RISCV32)
53 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32
54 #elif defined(TARGET_RISCV64)
55 # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64
58 #define RV(x) ((target_ulong)1 << (x - 'A'))
61 #define RVE RV('E') /* E and I are mutually exclusive */
73 /* S extension denotes that Supervisor mode exists, however it is possible
74 to have a core that support S mode but does not have an MMU and there
75 is currently no bit in misa to indicate whether an MMU exists or not
76 so a cpu features bitfield is required, likewise for optional PMP support */
84 #define PRIV_VERSION_1_10_0 0x00011000
85 #define PRIV_VERSION_1_11_0 0x00011100
87 #define VEXT_VERSION_1_00_0 0x00010000
93 TRANSLATE_G_STAGE_FAIL
96 #define MMU_USER_IDX 3
98 #define MAX_RISCV_PMPS (16)
100 typedef struct CPURISCVState CPURISCVState;
102 #if !defined(CONFIG_USER_ONLY)
106 #define RV_VLEN_MAX 1024
108 FIELD(VTYPE, VLMUL, 0, 3)
109 FIELD(VTYPE, VSEW, 3, 3)
110 FIELD(VTYPE, VTA, 6, 1)
111 FIELD(VTYPE, VMA, 7, 1)
112 FIELD(VTYPE, VEDIV, 8, 2)
113 FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11)
114 FIELD(VTYPE, VILL, sizeof(target_ulong) * 8 - 1, 1)
116 struct CPURISCVState {
117 target_ulong gpr[32];
118 target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */
119 uint64_t fpr[32]; /* assume both F and D extensions */
121 /* vector coprocessor state. */
122 uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16);
130 target_ulong load_res;
131 target_ulong load_val;
135 target_ulong badaddr;
138 target_ulong guest_phys_fault_addr;
140 target_ulong priv_ver;
141 target_ulong bext_ver;
142 target_ulong vext_ver;
144 /* RISCVMXL, but uint32_t for vmstate migration */
145 uint32_t misa_mxl; /* current mxl */
146 uint32_t misa_mxl_max; /* max mxl for this cpu */
147 uint32_t misa_ext; /* current extensions */
148 uint32_t misa_ext_mask; /* max ext for this cpu */
149 uint32_t xl; /* current xlen */
151 /* 128-bit helpers upper part return value */
156 #ifdef CONFIG_USER_ONLY
160 #ifndef CONFIG_USER_ONLY
162 /* This contains QEMU specific information about the virt state. */
164 target_ulong resetvec;
166 target_ulong mhartid;
168 * For RV32 this is 32-bit mstatus and 32-bit mstatush.
169 * For RV64 this is a 64-bit mstatus.
178 target_ulong mideleg;
180 target_ulong satp; /* since: priv-1.10.0 */
182 target_ulong medeleg;
191 target_ulong mtval; /* since: priv-1.10.0 */
193 /* Hypervisor CSRs */
194 target_ulong hstatus;
195 target_ulong hedeleg;
196 target_ulong hideleg;
197 target_ulong hcounteren;
203 /* Upper 64-bits of 128-bit CSRs */
209 * For RV32 this is 32-bit vsstatus and 32-bit vsstatush.
210 * For RV64 this is a 64-bit vsstatus.
214 target_ulong vsscratch;
216 target_ulong vscause;
224 target_ulong stvec_hs;
225 target_ulong sscratch_hs;
226 target_ulong sepc_hs;
227 target_ulong scause_hs;
228 target_ulong stval_hs;
229 target_ulong satp_hs;
232 /* Signals whether the current exception occurred with two-stage address
233 translation active. */
234 bool two_stage_lookup;
236 target_ulong scounteren;
237 target_ulong mcounteren;
239 target_ulong sscratch;
240 target_ulong mscratch;
242 /* temporary htif regs */
247 /* physical memory protection */
248 pmp_table_t pmp_state;
249 target_ulong mseccfg;
251 /* machine specific rdtime callback */
252 uint64_t (*rdtime_fn)(uint32_t);
253 uint32_t rdtime_fn_arg;
255 /* True if in debugger mode. */
259 * CSRs for PointerMasking extension
262 target_ulong mpmmask;
263 target_ulong mpmbase;
264 target_ulong spmmask;
265 target_ulong spmbase;
266 target_ulong upmmask;
267 target_ulong upmbase;
269 target_ulong cur_pmmask;
270 target_ulong cur_pmbase;
272 float_status fp_status;
274 /* Fields from here on are preserved across CPU reset. */
275 QEMUTimer *timer; /* Internal timer */
281 bool kvm_timer_dirty;
282 uint64_t kvm_timer_time;
283 uint64_t kvm_timer_compare;
284 uint64_t kvm_timer_state;
285 uint64_t kvm_timer_frequency;
288 OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass,
293 * @parent_realize: The parent class' realize handler.
294 * @parent_reset: The parent class' reset handler.
298 struct RISCVCPUClass {
300 CPUClass parent_class;
302 DeviceRealize parent_realize;
303 DeviceReset parent_reset;
308 * @env: #CPURISCVState
316 CPUNegativeOffsetState neg;
322 /* Configuration Settings */
362 static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext)
364 return (env->misa_ext & ext) != 0;
367 static inline bool riscv_feature(CPURISCVState *env, int feature)
369 return env->features & (1ULL << feature);
372 #include "cpu_user.h"
374 extern const char * const riscv_int_regnames[];
375 extern const char * const riscv_int_regnamesh[];
376 extern const char * const riscv_fpr_regnames[];
378 const char *riscv_cpu_get_trap_name(target_ulong cause, bool async);
379 void riscv_cpu_do_interrupt(CPUState *cpu);
380 int riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
381 int cpuid, void *opaque);
382 int riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
383 int cpuid, void *opaque);
384 int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
385 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
386 bool riscv_cpu_fp_enabled(CPURISCVState *env);
387 bool riscv_cpu_vector_enabled(CPURISCVState *env);
388 bool riscv_cpu_virt_enabled(CPURISCVState *env);
389 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable);
390 bool riscv_cpu_two_stage_lookup(int mmu_idx);
391 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch);
392 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
393 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
394 MMUAccessType access_type, int mmu_idx,
395 uintptr_t retaddr) QEMU_NORETURN;
396 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
397 MMUAccessType access_type, int mmu_idx,
398 bool probe, uintptr_t retaddr);
399 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
400 vaddr addr, unsigned size,
401 MMUAccessType access_type,
402 int mmu_idx, MemTxAttrs attrs,
403 MemTxResult response, uintptr_t retaddr);
404 char *riscv_isa_string(RISCVCPU *cpu);
405 void riscv_cpu_list(void);
407 #define cpu_list riscv_cpu_list
408 #define cpu_mmu_index riscv_cpu_mmu_index
410 #ifndef CONFIG_USER_ONLY
411 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
412 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env);
413 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts);
414 uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value);
415 #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */
416 void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t),
419 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);
421 void riscv_translate_init(void);
422 void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env,
423 uint32_t exception, uintptr_t pc);
425 target_ulong riscv_cpu_get_fflags(CPURISCVState *env);
426 void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
428 #define TB_FLAGS_PRIV_MMU_MASK 3
429 #define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2)
430 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS
431 #define TB_FLAGS_MSTATUS_VS MSTATUS_VS
433 typedef CPURISCVState CPUArchState;
434 typedef RISCVCPU ArchCPU;
435 #include "exec/cpu-all.h"
437 FIELD(TB_FLAGS, MEM_IDX, 0, 3)
438 FIELD(TB_FLAGS, LMUL, 3, 3)
439 FIELD(TB_FLAGS, SEW, 6, 3)
440 /* Skip MSTATUS_VS (0x600) bits */
441 FIELD(TB_FLAGS, VL_EQ_VLMAX, 11, 1)
442 FIELD(TB_FLAGS, VILL, 12, 1)
443 /* Skip MSTATUS_FS (0x6000) bits */
444 /* Is a Hypervisor instruction load/store allowed? */
445 FIELD(TB_FLAGS, HLSX, 15, 1)
446 FIELD(TB_FLAGS, MSTATUS_HS_FS, 16, 2)
447 FIELD(TB_FLAGS, MSTATUS_HS_VS, 18, 2)
448 /* The combination of MXL/SXL/UXL that applies to the current cpu mode. */
449 FIELD(TB_FLAGS, XL, 20, 2)
450 /* If PointerMasking should be applied */
451 FIELD(TB_FLAGS, PM_ENABLED, 22, 1)
453 #ifdef TARGET_RISCV32
454 #define riscv_cpu_mxl(env) ((void)(env), MXL_RV32)
456 static inline RISCVMXL riscv_cpu_mxl(CPURISCVState *env)
458 return env->misa_mxl;
462 #if defined(TARGET_RISCV32)
463 #define cpu_recompute_xl(env) ((void)(env), MXL_RV32)
465 static inline RISCVMXL cpu_recompute_xl(CPURISCVState *env)
467 RISCVMXL xl = env->misa_mxl;
468 #if !defined(CONFIG_USER_ONLY)
470 * When emulating a 32-bit-only cpu, use RV32.
471 * When emulating a 64-bit cpu, and MXL has been reduced to RV32,
472 * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened
473 * back to RV64 for lower privs.
475 if (xl != MXL_RV32) {
480 xl = get_field(env->mstatus, MSTATUS64_UXL);
482 default: /* PRV_S | PRV_H */
483 xl = get_field(env->mstatus, MSTATUS64_SXL);
493 * Encode LMUL to lmul as follows:
504 * then, we can calculate VLMAX = vlen >> (vsew + 3 - lmul)
505 * e.g. vlen = 256 bits, SEW = 16, LMUL = 1/8
506 * => VLMAX = vlen >> (1 + 3 - (-3))
510 static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype)
512 uint8_t sew = FIELD_EX64(vtype, VTYPE, VSEW);
513 int8_t lmul = sextract32(FIELD_EX64(vtype, VTYPE, VLMUL), 0, 3);
514 return cpu->cfg.vlen >> (sew + 3 - lmul);
517 void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc,
518 target_ulong *cs_base, uint32_t *pflags);
520 void riscv_cpu_update_mask(CPURISCVState *env);
522 RISCVException riscv_csrrw(CPURISCVState *env, int csrno,
523 target_ulong *ret_value,
524 target_ulong new_value, target_ulong write_mask);
525 RISCVException riscv_csrrw_debug(CPURISCVState *env, int csrno,
526 target_ulong *ret_value,
527 target_ulong new_value,
528 target_ulong write_mask);
530 static inline void riscv_csr_write(CPURISCVState *env, int csrno,
533 riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS));
536 static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno)
538 target_ulong val = 0;
539 riscv_csrrw(env, csrno, &val, 0, 0);
543 typedef RISCVException (*riscv_csr_predicate_fn)(CPURISCVState *env,
545 typedef RISCVException (*riscv_csr_read_fn)(CPURISCVState *env, int csrno,
546 target_ulong *ret_value);
547 typedef RISCVException (*riscv_csr_write_fn)(CPURISCVState *env, int csrno,
548 target_ulong new_value);
549 typedef RISCVException (*riscv_csr_op_fn)(CPURISCVState *env, int csrno,
550 target_ulong *ret_value,
551 target_ulong new_value,
552 target_ulong write_mask);
554 RISCVException riscv_csrrw_i128(CPURISCVState *env, int csrno,
556 Int128 new_value, Int128 write_mask);
558 typedef RISCVException (*riscv_csr_read128_fn)(CPURISCVState *env, int csrno,
560 typedef RISCVException (*riscv_csr_write128_fn)(CPURISCVState *env, int csrno,
565 riscv_csr_predicate_fn predicate;
566 riscv_csr_read_fn read;
567 riscv_csr_write_fn write;
569 riscv_csr_read128_fn read128;
570 riscv_csr_write128_fn write128;
571 } riscv_csr_operations;
573 /* CSR function table constants */
575 CSR_TABLE_SIZE = 0x1000
578 /* CSR function table */
579 extern riscv_csr_operations csr_ops[CSR_TABLE_SIZE];
581 void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops);
582 void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops);
584 void riscv_cpu_register_gdb_regs_for_features(CPUState *cs);
586 #endif /* RISCV_CPU_H */