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/*
* Altera Nios II virtual CPU header
*
* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
*
* 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
* <http://www.gnu.org/licenses/lgpl-2.1.html>
*/
#ifndef CPU_NIOS2_H
#define CPU_NIOS2_H
#include "qemu-common.h"
#define TARGET_LONG_BITS 32
#define CPUArchState struct CPUNios2State
#include "exec/cpu-defs.h"
#include "qom/cpu.h"
struct CPUNios2State;
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 -1
#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
#define NB_MMU_MODES 2
struct CPUNios2State {
uint32_t regs[NUM_CORE_REGS];
#if !defined(CONFIG_USER_ONLY)
Nios2MMU mmu;
uint32_t irq_pending;
#endif
CPU_COMMON
};
/**
* Nios2CPU:
* @env: #CPUNios2State
*
* A Nios2 CPU.
*/
typedef struct Nios2CPU {
/*< private >*/
CPUState parent_obj;
/*< public >*/
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;
static inline Nios2CPU *nios2_env_get_cpu(CPUNios2State *env)
{
return NIOS2_CPU(container_of(env, Nios2CPU, env));
}
#define ENV_GET_CPU(e) CPU(nios2_env_get_cpu(e))
#define ENV_OFFSET offsetof(Nios2CPU, env)
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(FILE *f, fprintf_function cpu_fprintf, CPUNios2State *env);
void nios2_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
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);
#define TARGET_PHYS_ADDR_SPACE_BITS 32
#ifdef CONFIG_USER_ONLY
# define TARGET_VIRT_ADDR_SPACE_BITS 31
#else
# define TARGET_VIRT_ADDR_SPACE_BITS 32
#endif
#define cpu_init(cpu_model) cpu_generic_init(TYPE_NIOS2_CPU, cpu_model)
#define cpu_gen_code cpu_nios2_gen_code
#define cpu_signal_handler cpu_nios2_signal_handler
#define CPU_SAVE_VERSION 1
#define TARGET_PAGE_BITS 12
/* MMU modes definitions */
#define MMU_MODE0_SUFFIX _kernel
#define MMU_MODE1_SUFFIX _user
#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;
}
int nios2_cpu_handle_mmu_fault(CPUState *env, vaddr address, int size,
int rw, int mmu_idx);
static inline int cpu_interrupts_enabled(CPUNios2State *env)
{
return env->regs[CR_STATUS] & CR_STATUS_PIE;
}
#include "exec/cpu-all.h"
#include "exec/exec-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 /* CPU_NIOS2_H */
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