/* * Altera Nios II virtual CPU header * * Copyright (c) 2012 Chris Wulff * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see * */ #ifndef NIOS2_CPU_H #define NIOS2_CPU_H #include "exec/cpu-defs.h" #include "hw/core/cpu.h" #include "hw/registerfields.h" #include "qom/object.h" typedef struct CPUArchState CPUNios2State; #if !defined(CONFIG_USER_ONLY) #include "mmu.h" #endif #define TYPE_NIOS2_CPU "nios2-cpu" OBJECT_DECLARE_CPU_TYPE(Nios2CPU, Nios2CPUClass, NIOS2_CPU) /** * Nios2CPUClass: * @parent_phases: The parent class' reset phase handlers. * * A Nios2 CPU model. */ struct Nios2CPUClass { /*< private >*/ CPUClass parent_class; /*< public >*/ DeviceRealize parent_realize; ResettablePhases parent_phases; }; #define TARGET_HAS_ICE 1 /* Configuration options for Nios II */ #define RESET_ADDRESS 0x00000000 #define EXCEPTION_ADDRESS 0x00000004 #define FAST_TLB_MISS_ADDRESS 0x00000008 #define NUM_GP_REGS 32 #define NUM_CR_REGS 32 #ifndef CONFIG_USER_ONLY /* 63 shadow register sets; index 0 is the primary register set. */ #define NUM_REG_SETS 64 #endif /* General purpose register aliases */ enum { R_ZERO = 0, R_AT = 1, R_RET0 = 2, R_RET1 = 3, R_ARG0 = 4, R_ARG1 = 5, R_ARG2 = 6, R_ARG3 = 7, R_ET = 24, R_BT = 25, R_GP = 26, R_SP = 27, R_FP = 28, R_EA = 29, R_BA = 30, R_SSTATUS = 30, R_RA = 31, }; /* Control register aliases */ enum { CR_STATUS = 0, CR_ESTATUS = 1, CR_BSTATUS = 2, CR_IENABLE = 3, CR_IPENDING = 4, CR_CPUID = 5, CR_EXCEPTION = 7, CR_PTEADDR = 8, CR_TLBACC = 9, CR_TLBMISC = 10, CR_ENCINJ = 11, CR_BADADDR = 12, CR_CONFIG = 13, CR_MPUBASE = 14, CR_MPUACC = 15, }; FIELD(CR_STATUS, PIE, 0, 1) FIELD(CR_STATUS, U, 1, 1) FIELD(CR_STATUS, EH, 2, 1) FIELD(CR_STATUS, IH, 3, 1) FIELD(CR_STATUS, IL, 4, 6) FIELD(CR_STATUS, CRS, 10, 6) FIELD(CR_STATUS, PRS, 16, 6) FIELD(CR_STATUS, NMI, 22, 1) FIELD(CR_STATUS, RSIE, 23, 1) FIELD(CR_STATUS, SRS, 31, 1) /* only in sstatus */ #define CR_STATUS_PIE R_CR_STATUS_PIE_MASK #define CR_STATUS_U R_CR_STATUS_U_MASK #define CR_STATUS_EH R_CR_STATUS_EH_MASK #define CR_STATUS_IH R_CR_STATUS_IH_MASK #define CR_STATUS_NMI R_CR_STATUS_NMI_MASK #define CR_STATUS_RSIE R_CR_STATUS_RSIE_MASK #define CR_STATUS_SRS R_CR_STATUS_SRS_MASK FIELD(CR_EXCEPTION, CAUSE, 2, 5) FIELD(CR_EXCEPTION, ECCFTL, 31, 1) FIELD(CR_PTEADDR, VPN, 2, 20) FIELD(CR_PTEADDR, PTBASE, 22, 10) FIELD(CR_TLBACC, PFN, 0, 20) FIELD(CR_TLBACC, G, 20, 1) FIELD(CR_TLBACC, X, 21, 1) FIELD(CR_TLBACC, W, 22, 1) FIELD(CR_TLBACC, R, 23, 1) FIELD(CR_TLBACC, C, 24, 1) FIELD(CR_TLBACC, IG, 25, 7) #define CR_TLBACC_C R_CR_TLBACC_C_MASK #define CR_TLBACC_R R_CR_TLBACC_R_MASK #define CR_TLBACC_W R_CR_TLBACC_W_MASK #define CR_TLBACC_X R_CR_TLBACC_X_MASK #define CR_TLBACC_G R_CR_TLBACC_G_MASK FIELD(CR_TLBMISC, D, 0, 1) FIELD(CR_TLBMISC, PERM, 1, 1) FIELD(CR_TLBMISC, BAD, 2, 1) FIELD(CR_TLBMISC, DBL, 3, 1) FIELD(CR_TLBMISC, PID, 4, 14) FIELD(CR_TLBMISC, WE, 18, 1) FIELD(CR_TLBMISC, RD, 19, 1) FIELD(CR_TLBMISC, WAY, 20, 4) FIELD(CR_TLBMISC, EE, 24, 1) #define CR_TLBMISC_EE R_CR_TLBMISC_EE_MASK #define CR_TLBMISC_RD R_CR_TLBMISC_RD_MASK #define CR_TLBMISC_WE R_CR_TLBMISC_WE_MASK #define CR_TLBMISC_DBL R_CR_TLBMISC_DBL_MASK #define CR_TLBMISC_BAD R_CR_TLBMISC_BAD_MASK #define CR_TLBMISC_PERM R_CR_TLBMISC_PERM_MASK #define CR_TLBMISC_D R_CR_TLBMISC_D_MASK /* Exceptions */ #define EXCP_BREAK 0x1000 #define EXCP_SEMIHOST 0x1001 #define EXCP_RESET 0 #define EXCP_PRESET 1 #define EXCP_IRQ 2 #define EXCP_TRAP 3 #define EXCP_UNIMPL 4 #define EXCP_ILLEGAL 5 #define EXCP_UNALIGN 6 #define EXCP_UNALIGND 7 #define EXCP_DIV 8 #define EXCP_SUPERA_X 9 #define EXCP_SUPERI 10 #define EXCP_SUPERA_D 11 #define EXCP_TLB_X 12 #define EXCP_TLB_D (0x1000 | EXCP_TLB_X) #define EXCP_PERM_X 13 #define EXCP_PERM_R 14 #define EXCP_PERM_W 15 #define EXCP_MPUI 16 #define EXCP_MPUD 17 struct CPUArchState { #ifdef CONFIG_USER_ONLY uint32_t regs[NUM_GP_REGS]; #else uint32_t shadow_regs[NUM_REG_SETS][NUM_GP_REGS]; /* Pointer into shadow_regs for the current register set. */ uint32_t *regs; #endif uint32_t ctrl[NUM_CR_REGS]; uint32_t pc; #if !defined(CONFIG_USER_ONLY) Nios2MMU mmu; #endif int error_code; }; typedef struct { uint32_t writable; uint32_t readonly; } ControlRegState; /** * Nios2CPU: * @env: #CPUNios2State * * A Nios2 CPU. */ struct ArchCPU { /*< private >*/ CPUState parent_obj; /*< public >*/ CPUNios2State env; bool diverr_present; bool mmu_present; bool eic_present; uint32_t pid_num_bits; uint32_t tlb_num_ways; uint32_t tlb_num_entries; /* Addresses that are hard-coded in the FPGA build settings */ uint32_t reset_addr; uint32_t exception_addr; uint32_t fast_tlb_miss_addr; /* Bits within each control register which are reserved or readonly. */ ControlRegState cr_state[NUM_CR_REGS]; /* External Interrupt Controller Interface */ uint32_t rha; /* Requested handler address */ uint32_t ril; /* Requested interrupt level */ uint32_t rrs; /* Requested register set */ bool rnmi; /* Requested nonmaskable interrupt */ }; static inline bool nios2_cr_reserved(const ControlRegState *s) { return (s->writable | s->readonly) == 0; } static inline void nios2_update_crs(CPUNios2State *env) { #ifndef CONFIG_USER_ONLY unsigned crs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, CRS); env->regs = env->shadow_regs[crs]; #endif } void nios2_tcg_init(void); void nios2_cpu_do_interrupt(CPUState *cs); void dump_mmu(CPUNios2State *env); void nios2_cpu_dump_state(CPUState *cpu, FILE *f, int flags); G_NORETURN void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr, MMUAccessType access_type, int mmu_idx, uintptr_t retaddr); G_NORETURN void nios2_cpu_loop_exit_advance(CPUNios2State *env, uintptr_t retaddr); void do_nios2_semihosting(CPUNios2State *env); #define CPU_RESOLVING_TYPE TYPE_NIOS2_CPU #define cpu_gen_code cpu_nios2_gen_code #define CPU_SAVE_VERSION 1 /* MMU modes definitions */ #define MMU_SUPERVISOR_IDX 0 #define MMU_USER_IDX 1 static inline int cpu_mmu_index(CPUNios2State *env, bool ifetch) { return (env->ctrl[CR_STATUS] & CR_STATUS_U) ? MMU_USER_IDX : MMU_SUPERVISOR_IDX; } #ifndef CONFIG_USER_ONLY hwaddr nios2_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr); #endif typedef CPUNios2State CPUArchState; typedef Nios2CPU ArchCPU; #include "exec/cpu-all.h" FIELD(TBFLAGS, CRS0, 0, 1) /* Set if CRS == 0. */ FIELD(TBFLAGS, U, 1, 1) /* Overlaps CR_STATUS_U */ FIELD(TBFLAGS, R0_0, 2, 1) /* Set if R0 == 0. */ static inline void cpu_get_tb_cpu_state(CPUNios2State *env, vaddr *pc, uint64_t *cs_base, uint32_t *flags) { unsigned crs = FIELD_EX32(env->ctrl[CR_STATUS], CR_STATUS, CRS); *pc = env->pc; *cs_base = 0; *flags = (env->ctrl[CR_STATUS] & CR_STATUS_U) | (crs ? 0 : R_TBFLAGS_CRS0_MASK) | (env->regs[0] ? 0 : R_TBFLAGS_R0_0_MASK); } #endif /* NIOS2_CPU_H */