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qemu/target/nios2/cpu.h
Chris Wulff 032c76bc6f nios2: Add architecture emulation support 
Add support for emulating Altera NiosII R1 architecture into qemu.
This patch is based on previous work by Chris Wulff from 2012 and
updated to latest mainline QEMU.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chris Wulff <crwulff@gmail.com>
Cc: Jeff Da Silva <jdasilva@altera.com>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Sandra Loosemore <sandra@codesourcery.com>
Cc: Yves Vandervennet <yvanderv@altera.com>
Cc: Alexander Graf <agraf@suse.de>
Message-Id: <20170118220146.489-3-marex@denx.de>
[rth: Remove tlb_flush from nios2_cpu_reset.]
Signed-off-by: Richard Henderson <rth@twiddle.net>
2017-01-24 13:10:35 -08:00

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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/osdep.h"
#include "qemu-common.h"
#define TARGET_LONG_BITS 32
#define CPUArchState struct CPUNios2State
#include "exec/cpu-defs.h"
#include "fpu/softfloat.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);
Nios2CPU *cpu_nios2_init(const char *cpu_model);
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
#define TARGET_VIRT_ADDR_SPACE_BITS 32
#define cpu_init(cpu_model) CPU(cpu_nios2_init(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 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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