/* * 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" typedef struct CPUNios2State CPUNios2State; #if !defined(CONFIG_USER_ONLY) #include "mmu.h" #endif #define TYPE_NIOS2_CPU "nios2-cpu" #define NIOS2_CPU_CLASS(klass) \ OBJECT_CLASS_CHECK(Nios2CPUClass, (klass), TYPE_NIOS2_CPU) #define NIOS2_CPU(obj) \ OBJECT_CHECK(Nios2CPU, (obj), TYPE_NIOS2_CPU) #define NIOS2_CPU_GET_CLASS(obj) \ OBJECT_GET_CLASS(Nios2CPUClass, (obj), TYPE_NIOS2_CPU) /** * Nios2CPUClass: * @parent_reset: The parent class' reset handler. * * A Nios2 CPU model. */ typedef struct Nios2CPUClass { /*< private >*/ CPUClass parent_class; /*< public >*/ DeviceRealize parent_realize; void (*parent_reset)(CPUState *cpu); } Nios2CPUClass; #define TARGET_HAS_ICE 1 /* Configuration options for Nios II */ #define RESET_ADDRESS 0x00000000 #define EXCEPTION_ADDRESS 0x00000004 #define FAST_TLB_MISS_ADDRESS 0x00000008 /* GP regs + CR regs + PC */ #define NUM_CORE_REGS (32 + 32 + 1) /* General purpose register aliases */ #define R_ZERO 0 #define R_AT 1 #define R_RET0 2 #define R_RET1 3 #define R_ARG0 4 #define R_ARG1 5 #define R_ARG2 6 #define R_ARG3 7 #define R_ET 24 #define R_BT 25 #define R_GP 26 #define R_SP 27 #define R_FP 28 #define R_EA 29 #define R_BA 30 #define R_RA 31 /* Control register aliases */ #define CR_BASE 32 #define CR_STATUS (CR_BASE + 0) #define CR_STATUS_PIE (1 << 0) #define CR_STATUS_U (1 << 1) #define CR_STATUS_EH (1 << 2) #define CR_STATUS_IH (1 << 3) #define CR_STATUS_IL (63 << 4) #define CR_STATUS_CRS (63 << 10) #define CR_STATUS_PRS (63 << 16) #define CR_STATUS_NMI (1 << 22) #define CR_STATUS_RSIE (1 << 23) #define CR_ESTATUS (CR_BASE + 1) #define CR_BSTATUS (CR_BASE + 2) #define CR_IENABLE (CR_BASE + 3) #define CR_IPENDING (CR_BASE + 4) #define CR_CPUID (CR_BASE + 5) #define CR_CTL6 (CR_BASE + 6) #define CR_EXCEPTION (CR_BASE + 7) #define CR_PTEADDR (CR_BASE + 8) #define CR_PTEADDR_PTBASE_SHIFT 22 #define CR_PTEADDR_PTBASE_MASK (0x3FF << CR_PTEADDR_PTBASE_SHIFT) #define CR_PTEADDR_VPN_SHIFT 2 #define CR_PTEADDR_VPN_MASK (0xFFFFF << CR_PTEADDR_VPN_SHIFT) #define CR_TLBACC (CR_BASE + 9) #define CR_TLBACC_IGN_SHIFT 25 #define CR_TLBACC_IGN_MASK (0x7F << CR_TLBACC_IGN_SHIFT) #define CR_TLBACC_C (1 << 24) #define CR_TLBACC_R (1 << 23) #define CR_TLBACC_W (1 << 22) #define CR_TLBACC_X (1 << 21) #define CR_TLBACC_G (1 << 20) #define CR_TLBACC_PFN_MASK 0x000FFFFF #define CR_TLBMISC (CR_BASE + 10) #define CR_TLBMISC_WAY_SHIFT 20 #define CR_TLBMISC_WAY_MASK (0xF << CR_TLBMISC_WAY_SHIFT) #define CR_TLBMISC_RD (1 << 19) #define CR_TLBMISC_WR (1 << 18) #define CR_TLBMISC_PID_SHIFT 4 #define CR_TLBMISC_PID_MASK (0x3FFF << CR_TLBMISC_PID_SHIFT) #define CR_TLBMISC_DBL (1 << 3) #define CR_TLBMISC_BAD (1 << 2) #define CR_TLBMISC_PERM (1 << 1) #define CR_TLBMISC_D (1 << 0) #define CR_ENCINJ (CR_BASE + 11) #define CR_BADADDR (CR_BASE + 12) #define CR_CONFIG (CR_BASE + 13) #define CR_MPUBASE (CR_BASE + 14) #define CR_MPUACC (CR_BASE + 15) /* Other registers */ #define R_PC 64 /* Exceptions */ #define EXCP_BREAK 0x1000 #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 9 #define EXCP_SUPERI 10 #define EXCP_SUPERD 11 #define EXCP_TLBD 12 #define EXCP_TLBX 13 #define EXCP_TLBR 14 #define EXCP_TLBW 15 #define EXCP_MPUI 16 #define EXCP_MPUD 17 #define CPU_INTERRUPT_NMI CPU_INTERRUPT_TGT_EXT_3 struct CPUNios2State { uint32_t regs[NUM_CORE_REGS]; #if !defined(CONFIG_USER_ONLY) Nios2MMU mmu; uint32_t irq_pending; #endif }; /** * Nios2CPU: * @env: #CPUNios2State * * A Nios2 CPU. */ typedef struct Nios2CPU { /*< private >*/ CPUState parent_obj; /*< public >*/ CPUNegativeOffsetState neg; CPUNios2State env; bool mmu_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; } Nios2CPU; void nios2_tcg_init(void); void nios2_cpu_do_interrupt(CPUState *cs); int cpu_nios2_signal_handler(int host_signum, void *pinfo, void *puc); void dump_mmu(CPUNios2State *env); void nios2_cpu_dump_state(CPUState *cpu, FILE *f, int flags); hwaddr nios2_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr); void nios2_cpu_do_unaligned_access(CPUState *cpu, vaddr addr, MMUAccessType access_type, int mmu_idx, uintptr_t retaddr); qemu_irq *nios2_cpu_pic_init(Nios2CPU *cpu); void nios2_check_interrupts(CPUNios2State *env); void do_nios2_semihosting(CPUNios2State *env); #define CPU_RESOLVING_TYPE TYPE_NIOS2_CPU #define cpu_gen_code cpu_nios2_gen_code #define cpu_signal_handler cpu_nios2_signal_handler #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->regs[CR_STATUS] & CR_STATUS_U) ? MMU_USER_IDX : MMU_SUPERVISOR_IDX; } bool nios2_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr); static inline int cpu_interrupts_enabled(CPUNios2State *env) { return env->regs[CR_STATUS] & CR_STATUS_PIE; } typedef CPUNios2State CPUArchState; typedef Nios2CPU ArchCPU; #include "exec/cpu-all.h" static inline void cpu_get_tb_cpu_state(CPUNios2State *env, target_ulong *pc, target_ulong *cs_base, uint32_t *flags) { *pc = env->regs[R_PC]; *cs_base = 0; *flags = (env->regs[CR_STATUS] & (CR_STATUS_EH | CR_STATUS_U)); } #endif /* NIOS2_CPU_H */