/* * QEMU RISC-V CPU * * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu * Copyright (c) 2017-2018 SiFive, Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2 or later, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see . */ #ifndef RISCV_CPU_H #define RISCV_CPU_H #include "hw/core/cpu.h" #include "hw/registerfields.h" #include "exec/cpu-defs.h" #include "fpu/softfloat-types.h" #include "qom/object.h" #include "qemu/int128.h" #include "cpu_bits.h" #define TCG_GUEST_DEFAULT_MO 0 #define TYPE_RISCV_CPU "riscv-cpu" #define RISCV_CPU_TYPE_SUFFIX "-" TYPE_RISCV_CPU #define RISCV_CPU_TYPE_NAME(name) (name RISCV_CPU_TYPE_SUFFIX) #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any") #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32") #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64") #define TYPE_RISCV_CPU_BASE128 RISCV_CPU_TYPE_NAME("x-rv128") #define TYPE_RISCV_CPU_IBEX RISCV_CPU_TYPE_NAME("lowrisc-ibex") #define TYPE_RISCV_CPU_SHAKTI_C RISCV_CPU_TYPE_NAME("shakti-c") #define TYPE_RISCV_CPU_SIFIVE_E31 RISCV_CPU_TYPE_NAME("sifive-e31") #define TYPE_RISCV_CPU_SIFIVE_E34 RISCV_CPU_TYPE_NAME("sifive-e34") #define TYPE_RISCV_CPU_SIFIVE_E51 RISCV_CPU_TYPE_NAME("sifive-e51") #define TYPE_RISCV_CPU_SIFIVE_U34 RISCV_CPU_TYPE_NAME("sifive-u34") #define TYPE_RISCV_CPU_SIFIVE_U54 RISCV_CPU_TYPE_NAME("sifive-u54") #define TYPE_RISCV_CPU_HOST RISCV_CPU_TYPE_NAME("host") #if defined(TARGET_RISCV32) # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE32 #elif defined(TARGET_RISCV64) # define TYPE_RISCV_CPU_BASE TYPE_RISCV_CPU_BASE64 #endif #define RV(x) ((target_ulong)1 << (x - 'A')) #define RVI RV('I') #define RVE RV('E') /* E and I are mutually exclusive */ #define RVM RV('M') #define RVA RV('A') #define RVF RV('F') #define RVD RV('D') #define RVV RV('V') #define RVC RV('C') #define RVS RV('S') #define RVU RV('U') #define RVH RV('H') #define RVJ RV('J') /* S extension denotes that Supervisor mode exists, however it is possible to have a core that support S mode but does not have an MMU and there is currently no bit in misa to indicate whether an MMU exists or not so a cpu features bitfield is required, likewise for optional PMP support */ enum { RISCV_FEATURE_MMU, RISCV_FEATURE_PMP, RISCV_FEATURE_EPMP, RISCV_FEATURE_MISA, RISCV_FEATURE_AIA }; #define PRIV_VERSION_1_10_0 0x00011000 #define PRIV_VERSION_1_11_0 0x00011100 #define VEXT_VERSION_1_00_0 0x00010000 enum { TRANSLATE_SUCCESS, TRANSLATE_FAIL, TRANSLATE_PMP_FAIL, TRANSLATE_G_STAGE_FAIL }; #define MMU_USER_IDX 3 #define MAX_RISCV_PMPS (16) typedef struct CPURISCVState CPURISCVState; #if !defined(CONFIG_USER_ONLY) #include "pmp.h" #endif #define RV_VLEN_MAX 1024 FIELD(VTYPE, VLMUL, 0, 3) FIELD(VTYPE, VSEW, 3, 3) FIELD(VTYPE, VTA, 6, 1) FIELD(VTYPE, VMA, 7, 1) FIELD(VTYPE, VEDIV, 8, 2) FIELD(VTYPE, RESERVED, 10, sizeof(target_ulong) * 8 - 11) struct CPURISCVState { target_ulong gpr[32]; target_ulong gprh[32]; /* 64 top bits of the 128-bit registers */ uint64_t fpr[32]; /* assume both F and D extensions */ /* vector coprocessor state. */ uint64_t vreg[32 * RV_VLEN_MAX / 64] QEMU_ALIGNED(16); target_ulong vxrm; target_ulong vxsat; target_ulong vl; target_ulong vstart; target_ulong vtype; bool vill; target_ulong pc; target_ulong load_res; target_ulong load_val; target_ulong frm; target_ulong badaddr; uint32_t bins; target_ulong guest_phys_fault_addr; target_ulong priv_ver; target_ulong bext_ver; target_ulong vext_ver; /* RISCVMXL, but uint32_t for vmstate migration */ uint32_t misa_mxl; /* current mxl */ uint32_t misa_mxl_max; /* max mxl for this cpu */ uint32_t misa_ext; /* current extensions */ uint32_t misa_ext_mask; /* max ext for this cpu */ uint32_t xl; /* current xlen */ /* 128-bit helpers upper part return value */ target_ulong retxh; uint32_t features; #ifdef CONFIG_USER_ONLY uint32_t elf_flags; #endif #ifndef CONFIG_USER_ONLY target_ulong priv; /* This contains QEMU specific information about the virt state. */ target_ulong virt; target_ulong geilen; target_ulong resetvec; target_ulong mhartid; /* * For RV32 this is 32-bit mstatus and 32-bit mstatush. * For RV64 this is a 64-bit mstatus. */ uint64_t mstatus; uint64_t mip; uint64_t miclaim; uint64_t mie; uint64_t mideleg; target_ulong satp; /* since: priv-1.10.0 */ target_ulong stval; target_ulong medeleg; target_ulong stvec; target_ulong sepc; target_ulong scause; target_ulong mtvec; target_ulong mepc; target_ulong mcause; target_ulong mtval; /* since: priv-1.10.0 */ /* Machine and Supervisor interrupt priorities */ uint8_t miprio[64]; uint8_t siprio[64]; /* AIA CSRs */ target_ulong miselect; target_ulong siselect; /* Hypervisor CSRs */ target_ulong hstatus; target_ulong hedeleg; uint64_t hideleg; target_ulong hcounteren; target_ulong htval; target_ulong htinst; target_ulong hgatp; target_ulong hgeie; target_ulong hgeip; uint64_t htimedelta; /* Hypervisor controlled virtual interrupt priorities */ target_ulong hvictl; uint8_t hviprio[64]; /* Upper 64-bits of 128-bit CSRs */ uint64_t mscratchh; uint64_t sscratchh; /* Virtual CSRs */ /* * For RV32 this is 32-bit vsstatus and 32-bit vsstatush. * For RV64 this is a 64-bit vsstatus. */ uint64_t vsstatus; target_ulong vstvec; target_ulong vsscratch; target_ulong vsepc; target_ulong vscause; target_ulong vstval; target_ulong vsatp; /* AIA VS-mode CSRs */ target_ulong vsiselect; target_ulong mtval2; target_ulong mtinst; /* HS Backup CSRs */ target_ulong stvec_hs; target_ulong sscratch_hs; target_ulong sepc_hs; target_ulong scause_hs; target_ulong stval_hs; target_ulong satp_hs; uint64_t mstatus_hs; /* Signals whether the current exception occurred with two-stage address translation active. */ bool two_stage_lookup; target_ulong scounteren; target_ulong mcounteren; target_ulong sscratch; target_ulong mscratch; /* temporary htif regs */ uint64_t mfromhost; uint64_t mtohost; uint64_t timecmp; /* physical memory protection */ pmp_table_t pmp_state; target_ulong mseccfg; /* machine specific rdtime callback */ uint64_t (*rdtime_fn)(uint32_t); uint32_t rdtime_fn_arg; /* machine specific AIA ireg read-modify-write callback */ #define AIA_MAKE_IREG(__isel, __priv, __virt, __vgein, __xlen) \ ((((__xlen) & 0xff) << 24) | \ (((__vgein) & 0x3f) << 20) | \ (((__virt) & 0x1) << 18) | \ (((__priv) & 0x3) << 16) | \ (__isel & 0xffff)) #define AIA_IREG_ISEL(__ireg) ((__ireg) & 0xffff) #define AIA_IREG_PRIV(__ireg) (((__ireg) >> 16) & 0x3) #define AIA_IREG_VIRT(__ireg) (((__ireg) >> 18) & 0x1) #define AIA_IREG_VGEIN(__ireg) (((__ireg) >> 20) & 0x3f) #define AIA_IREG_XLEN(__ireg) (((__ireg) >> 24) & 0xff) int (*aia_ireg_rmw_fn[4])(void *arg, target_ulong reg, target_ulong *val, target_ulong new_val, target_ulong write_mask); void *aia_ireg_rmw_fn_arg[4]; /* True if in debugger mode. */ bool debugger; /* * CSRs for PointerMasking extension */ target_ulong mmte; target_ulong mpmmask; target_ulong mpmbase; target_ulong spmmask; target_ulong spmbase; target_ulong upmmask; target_ulong upmbase; #endif target_ulong cur_pmmask; target_ulong cur_pmbase; float_status fp_status; /* Fields from here on are preserved across CPU reset. */ QEMUTimer *timer; /* Internal timer */ hwaddr kernel_addr; hwaddr fdt_addr; /* kvm timer */ bool kvm_timer_dirty; uint64_t kvm_timer_time; uint64_t kvm_timer_compare; uint64_t kvm_timer_state; uint64_t kvm_timer_frequency; }; OBJECT_DECLARE_TYPE(RISCVCPU, RISCVCPUClass, RISCV_CPU) /** * RISCVCPUClass: * @parent_realize: The parent class' realize handler. * @parent_reset: The parent class' reset handler. * * A RISCV CPU model. */ struct RISCVCPUClass { /*< private >*/ CPUClass parent_class; /*< public >*/ DeviceRealize parent_realize; DeviceReset parent_reset; }; struct RISCVCPUConfig { bool ext_i; bool ext_e; bool ext_g; bool ext_m; bool ext_a; bool ext_f; bool ext_d; bool ext_c; bool ext_s; bool ext_u; bool ext_h; bool ext_j; bool ext_v; bool ext_zba; bool ext_zbb; bool ext_zbc; bool ext_zbs; bool ext_counters; bool ext_ifencei; bool ext_icsr; bool ext_svnapot; bool ext_svpbmt; bool ext_zfh; bool ext_zfhmin; bool ext_zve32f; bool ext_zve64f; /* Vendor-specific custom extensions */ bool ext_XVentanaCondOps; char *priv_spec; char *user_spec; char *bext_spec; char *vext_spec; uint16_t vlen; uint16_t elen; bool mmu; bool pmp; bool epmp; bool aia; uint64_t resetvec; }; typedef struct RISCVCPUConfig RISCVCPUConfig; /** * RISCVCPU: * @env: #CPURISCVState * * A RISCV CPU. */ struct RISCVCPU { /*< private >*/ CPUState parent_obj; /*< public >*/ CPUNegativeOffsetState neg; CPURISCVState env; char *dyn_csr_xml; char *dyn_vreg_xml; /* Configuration Settings */ RISCVCPUConfig cfg; }; static inline int riscv_has_ext(CPURISCVState *env, target_ulong ext) { return (env->misa_ext & ext) != 0; } static inline bool riscv_feature(CPURISCVState *env, int feature) { return env->features & (1ULL << feature); } static inline void riscv_set_feature(CPURISCVState *env, int feature) { env->features |= (1ULL << feature); } #include "cpu_user.h" extern const char * const riscv_int_regnames[]; extern const char * const riscv_int_regnamesh[]; extern const char * const riscv_fpr_regnames[]; const char *riscv_cpu_get_trap_name(target_ulong cause, bool async); void riscv_cpu_do_interrupt(CPUState *cpu); int riscv_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs, int cpuid, void *opaque); int riscv_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs, int cpuid, void *opaque); int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg); int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg); int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero); uint8_t riscv_cpu_default_priority(int irq); int riscv_cpu_mirq_pending(CPURISCVState *env); int riscv_cpu_sirq_pending(CPURISCVState *env); int riscv_cpu_vsirq_pending(CPURISCVState *env); bool riscv_cpu_fp_enabled(CPURISCVState *env); target_ulong riscv_cpu_get_geilen(CPURISCVState *env); void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen); bool riscv_cpu_vector_enabled(CPURISCVState *env); bool riscv_cpu_virt_enabled(CPURISCVState *env); void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable); bool riscv_cpu_two_stage_lookup(int mmu_idx); int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch); hwaddr riscv_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, MMUAccessType access_type, int mmu_idx, uintptr_t retaddr) QEMU_NORETURN; bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr); void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr, unsigned size, MMUAccessType access_type, int mmu_idx, MemTxAttrs attrs, MemTxResult response, uintptr_t retaddr); char *riscv_isa_string(RISCVCPU *cpu); void riscv_cpu_list(void); #define cpu_list riscv_cpu_list #define cpu_mmu_index riscv_cpu_mmu_index #ifndef CONFIG_USER_ONLY bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request); void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env); int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts); uint64_t riscv_cpu_update_mip(RISCVCPU *cpu, uint64_t mask, uint64_t value); #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value */ void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t), uint32_t arg); void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv, int (*rmw_fn)(void *arg, target_ulong reg, target_ulong *val, target_ulong new_val, target_ulong write_mask), void *rmw_fn_arg); #endif void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv); void riscv_translate_init(void); void QEMU_NORETURN riscv_raise_exception(CPURISCVState *env, uint32_t exception, uintptr_t pc); target_ulong riscv_cpu_get_fflags(CPURISCVState *env); void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong); #define TB_FLAGS_PRIV_MMU_MASK 3 #define TB_FLAGS_PRIV_HYP_ACCESS_MASK (1 << 2) #define TB_FLAGS_MSTATUS_FS MSTATUS_FS #define TB_FLAGS_MSTATUS_VS MSTATUS_VS typedef CPURISCVState CPUArchState; typedef RISCVCPU ArchCPU; #include "exec/cpu-all.h" FIELD(TB_FLAGS, MEM_IDX, 0, 3) FIELD(TB_FLAGS, LMUL, 3, 3) FIELD(TB_FLAGS, SEW, 6, 3) /* Skip MSTATUS_VS (0x600) bits */ FIELD(TB_FLAGS, VL_EQ_VLMAX, 11, 1) FIELD(TB_FLAGS, VILL, 12, 1) /* Skip MSTATUS_FS (0x6000) bits */ /* Is a Hypervisor instruction load/store allowed? */ FIELD(TB_FLAGS, HLSX, 15, 1) FIELD(TB_FLAGS, MSTATUS_HS_FS, 16, 2) FIELD(TB_FLAGS, MSTATUS_HS_VS, 18, 2) /* The combination of MXL/SXL/UXL that applies to the current cpu mode. */ FIELD(TB_FLAGS, XL, 20, 2) /* If PointerMasking should be applied */ FIELD(TB_FLAGS, PM_MASK_ENABLED, 22, 1) FIELD(TB_FLAGS, PM_BASE_ENABLED, 23, 1) #ifdef TARGET_RISCV32 #define riscv_cpu_mxl(env) ((void)(env), MXL_RV32) #else static inline RISCVMXL riscv_cpu_mxl(CPURISCVState *env) { return env->misa_mxl; } #endif #define riscv_cpu_mxl_bits(env) (1UL << (4 + riscv_cpu_mxl(env))) #if defined(TARGET_RISCV32) #define cpu_recompute_xl(env) ((void)(env), MXL_RV32) #else static inline RISCVMXL cpu_recompute_xl(CPURISCVState *env) { RISCVMXL xl = env->misa_mxl; #if !defined(CONFIG_USER_ONLY) /* * When emulating a 32-bit-only cpu, use RV32. * When emulating a 64-bit cpu, and MXL has been reduced to RV32, * MSTATUSH doesn't have UXL/SXL, therefore XLEN cannot be widened * back to RV64 for lower privs. */ if (xl != MXL_RV32) { switch (env->priv) { case PRV_M: break; case PRV_U: xl = get_field(env->mstatus, MSTATUS64_UXL); break; default: /* PRV_S | PRV_H */ xl = get_field(env->mstatus, MSTATUS64_SXL); break; } } #endif return xl; } #endif static inline int riscv_cpu_xlen(CPURISCVState *env) { return 16 << env->xl; } #ifdef TARGET_RISCV32 #define riscv_cpu_sxl(env) ((void)(env), MXL_RV32) #else static inline RISCVMXL riscv_cpu_sxl(CPURISCVState *env) { #ifdef CONFIG_USER_ONLY return env->misa_mxl; #else return get_field(env->mstatus, MSTATUS64_SXL); #endif } #endif /* * Encode LMUL to lmul as follows: * LMUL vlmul lmul * 1 000 0 * 2 001 1 * 4 010 2 * 8 011 3 * - 100 - * 1/8 101 -3 * 1/4 110 -2 * 1/2 111 -1 * * then, we can calculate VLMAX = vlen >> (vsew + 3 - lmul) * e.g. vlen = 256 bits, SEW = 16, LMUL = 1/8 * => VLMAX = vlen >> (1 + 3 - (-3)) * = 256 >> 7 * = 2 */ static inline uint32_t vext_get_vlmax(RISCVCPU *cpu, target_ulong vtype) { uint8_t sew = FIELD_EX64(vtype, VTYPE, VSEW); int8_t lmul = sextract32(FIELD_EX64(vtype, VTYPE, VLMUL), 0, 3); return cpu->cfg.vlen >> (sew + 3 - lmul); } void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, target_ulong *cs_base, uint32_t *pflags); void riscv_cpu_update_mask(CPURISCVState *env); RISCVException riscv_csrrw(CPURISCVState *env, int csrno, target_ulong *ret_value, target_ulong new_value, target_ulong write_mask); RISCVException riscv_csrrw_debug(CPURISCVState *env, int csrno, target_ulong *ret_value, target_ulong new_value, target_ulong write_mask); static inline void riscv_csr_write(CPURISCVState *env, int csrno, target_ulong val) { riscv_csrrw(env, csrno, NULL, val, MAKE_64BIT_MASK(0, TARGET_LONG_BITS)); } static inline target_ulong riscv_csr_read(CPURISCVState *env, int csrno) { target_ulong val = 0; riscv_csrrw(env, csrno, &val, 0, 0); return val; } typedef RISCVException (*riscv_csr_predicate_fn)(CPURISCVState *env, int csrno); typedef RISCVException (*riscv_csr_read_fn)(CPURISCVState *env, int csrno, target_ulong *ret_value); typedef RISCVException (*riscv_csr_write_fn)(CPURISCVState *env, int csrno, target_ulong new_value); typedef RISCVException (*riscv_csr_op_fn)(CPURISCVState *env, int csrno, target_ulong *ret_value, target_ulong new_value, target_ulong write_mask); RISCVException riscv_csrrw_i128(CPURISCVState *env, int csrno, Int128 *ret_value, Int128 new_value, Int128 write_mask); typedef RISCVException (*riscv_csr_read128_fn)(CPURISCVState *env, int csrno, Int128 *ret_value); typedef RISCVException (*riscv_csr_write128_fn)(CPURISCVState *env, int csrno, Int128 new_value); typedef struct { const char *name; riscv_csr_predicate_fn predicate; riscv_csr_read_fn read; riscv_csr_write_fn write; riscv_csr_op_fn op; riscv_csr_read128_fn read128; riscv_csr_write128_fn write128; } riscv_csr_operations; /* CSR function table constants */ enum { CSR_TABLE_SIZE = 0x1000 }; /* CSR function table */ extern riscv_csr_operations csr_ops[CSR_TABLE_SIZE]; void riscv_get_csr_ops(int csrno, riscv_csr_operations *ops); void riscv_set_csr_ops(int csrno, riscv_csr_operations *ops); void riscv_cpu_register_gdb_regs_for_features(CPUState *cs); #endif /* RISCV_CPU_H */