/*
 *  SH4 emulation
 *
 *  Copyright (c) 2005 Samuel Tardieu
 *
 * 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/>.
 */

#ifndef SH4_CPU_H
#define SH4_CPU_H

#include "cpu-qom.h"
#include "exec/cpu-defs.h"
#include "qemu/cpu-float.h"

/* CPU Subtypes */
#define SH_CPU_SH7750  (1 << 0)
#define SH_CPU_SH7750S (1 << 1)
#define SH_CPU_SH7750R (1 << 2)
#define SH_CPU_SH7751  (1 << 3)
#define SH_CPU_SH7751R (1 << 4)
#define SH_CPU_SH7785  (1 << 5)
#define SH_CPU_SH7750_ALL (SH_CPU_SH7750 | SH_CPU_SH7750S | SH_CPU_SH7750R)
#define SH_CPU_SH7751_ALL (SH_CPU_SH7751 | SH_CPU_SH7751R)

#define SR_MD 30
#define SR_RB 29
#define SR_BL 28
#define SR_FD 15
#define SR_M  9
#define SR_Q  8
#define SR_I3 7
#define SR_I2 6
#define SR_I1 5
#define SR_I0 4
#define SR_S  1
#define SR_T  0

#define FPSCR_MASK             (0x003fffff)
#define FPSCR_FR               (1 << 21)
#define FPSCR_SZ               (1 << 20)
#define FPSCR_PR               (1 << 19)
#define FPSCR_DN               (1 << 18)
#define FPSCR_CAUSE_MASK       (0x3f << 12)
#define FPSCR_CAUSE_SHIFT      (12)
#define FPSCR_CAUSE_E          (1 << 17)
#define FPSCR_CAUSE_V          (1 << 16)
#define FPSCR_CAUSE_Z          (1 << 15)
#define FPSCR_CAUSE_O          (1 << 14)
#define FPSCR_CAUSE_U          (1 << 13)
#define FPSCR_CAUSE_I          (1 << 12)
#define FPSCR_ENABLE_MASK      (0x1f << 7)
#define FPSCR_ENABLE_SHIFT     (7)
#define FPSCR_ENABLE_V         (1 << 11)
#define FPSCR_ENABLE_Z         (1 << 10)
#define FPSCR_ENABLE_O         (1 << 9)
#define FPSCR_ENABLE_U         (1 << 8)
#define FPSCR_ENABLE_I         (1 << 7)
#define FPSCR_FLAG_MASK        (0x1f << 2)
#define FPSCR_FLAG_SHIFT       (2)
#define FPSCR_FLAG_V           (1 << 6)
#define FPSCR_FLAG_Z           (1 << 5)
#define FPSCR_FLAG_O           (1 << 4)
#define FPSCR_FLAG_U           (1 << 3)
#define FPSCR_FLAG_I           (1 << 2)
#define FPSCR_RM_MASK          (0x03 << 0)
#define FPSCR_RM_NEAREST       (0 << 0)
#define FPSCR_RM_ZERO          (1 << 0)

#define TB_FLAG_DELAY_SLOT       (1 << 0)
#define TB_FLAG_DELAY_SLOT_COND  (1 << 1)
#define TB_FLAG_DELAY_SLOT_RTE   (1 << 2)
#define TB_FLAG_PENDING_MOVCA    (1 << 3)
#define TB_FLAG_GUSA_SHIFT       4                      /* [11:4] */
#define TB_FLAG_GUSA_EXCLUSIVE   (1 << 12)
#define TB_FLAG_UNALIGN          (1 << 13)
#define TB_FLAG_SR_FD            (1 << SR_FD)           /* 15 */
#define TB_FLAG_FPSCR_PR         FPSCR_PR               /* 19 */
#define TB_FLAG_FPSCR_SZ         FPSCR_SZ               /* 20 */
#define TB_FLAG_FPSCR_FR         FPSCR_FR               /* 21 */
#define TB_FLAG_SR_RB            (1 << SR_RB)           /* 29 */
#define TB_FLAG_SR_MD            (1 << SR_MD)           /* 30 */

#define TB_FLAG_DELAY_SLOT_MASK  (TB_FLAG_DELAY_SLOT |       \
                                  TB_FLAG_DELAY_SLOT_COND |  \
                                  TB_FLAG_DELAY_SLOT_RTE)
#define TB_FLAG_GUSA_MASK        ((0xff << TB_FLAG_GUSA_SHIFT) | \
                                  TB_FLAG_GUSA_EXCLUSIVE)
#define TB_FLAG_FPSCR_MASK       (TB_FLAG_FPSCR_PR | \
                                  TB_FLAG_FPSCR_SZ | \
                                  TB_FLAG_FPSCR_FR)
#define TB_FLAG_SR_MASK          (TB_FLAG_SR_FD | \
                                  TB_FLAG_SR_RB | \
                                  TB_FLAG_SR_MD)
#define TB_FLAG_ENVFLAGS_MASK    (TB_FLAG_DELAY_SLOT_MASK | \
                                  TB_FLAG_GUSA_MASK)

typedef struct tlb_t {
    uint32_t vpn;        /* virtual page number */
    uint32_t ppn;        /* physical page number */
    uint32_t size;       /* mapped page size in bytes */
    uint8_t asid;        /* address space identifier */
    uint8_t v:1;         /* validity */
    uint8_t sz:2;        /* page size */
    uint8_t sh:1;        /* share status */
    uint8_t c:1;         /* cacheability */
    uint8_t pr:2;        /* protection key */
    uint8_t d:1;         /* dirty */
    uint8_t wt:1;        /* write through */
    uint8_t sa:3;        /* space attribute (PCMCIA) */
    uint8_t tc:1;        /* timing control */
} tlb_t;

#define UTLB_SIZE 64
#define ITLB_SIZE 4

#define TARGET_INSN_START_EXTRA_WORDS 1

enum sh_features {
    SH_FEATURE_SH4A = 1,
    SH_FEATURE_BCR3_AND_BCR4 = 2,
};

typedef struct memory_content {
    uint32_t address;
    uint32_t value;
    struct memory_content *next;
} memory_content;

typedef struct CPUArchState {
    uint32_t flags;             /* general execution flags */
    uint32_t gregs[24];         /* general registers */
    float32 fregs[32];          /* floating point registers */
    uint32_t sr;                /* status register (with T split out) */
    uint32_t sr_m;              /* M bit of status register */
    uint32_t sr_q;              /* Q bit of status register */
    uint32_t sr_t;              /* T bit of status register */
    uint32_t ssr;               /* saved status register */
    uint32_t spc;               /* saved program counter */
    uint32_t gbr;               /* global base register */
    uint32_t vbr;               /* vector base register */
    uint32_t sgr;               /* saved global register 15 */
    uint32_t dbr;               /* debug base register */
    uint32_t pc;                /* program counter */
    uint32_t delayed_pc;        /* target of delayed branch */
    uint32_t delayed_cond;      /* condition of delayed branch */
    uint32_t mach;              /* multiply and accumulate high */
    uint32_t macl;              /* multiply and accumulate low */
    uint32_t pr;                /* procedure register */
    uint32_t fpscr;             /* floating point status/control register */
    uint32_t fpul;              /* floating point communication register */

    /* float point status register */
    float_status fp_status;

    /* Those belong to the specific unit (SH7750) but are handled here */
    uint32_t mmucr;             /* MMU control register */
    uint32_t pteh;              /* page table entry high register */
    uint32_t ptel;              /* page table entry low register */
    uint32_t ptea;              /* page table entry assistance register */
    uint32_t ttb;               /* translation table base register */
    uint32_t tea;               /* TLB exception address register */
    uint32_t tra;               /* TRAPA exception register */
    uint32_t expevt;            /* exception event register */
    uint32_t intevt;            /* interrupt event register */

    tlb_t itlb[ITLB_SIZE];      /* instruction translation table */
    tlb_t utlb[UTLB_SIZE];      /* unified translation table */

    /* LDST = LOCK_ADDR != -1.  */
    uint32_t lock_addr;
    uint32_t lock_value;

    /* Fields up to this point are cleared by a CPU reset */
    struct {} end_reset_fields;

    /* Fields from here on are preserved over CPU reset. */
    int id;                     /* CPU model */

    /* The features that we should emulate. See sh_features above.  */
    uint32_t features;

    void *intc_handle;
    int in_sleep;               /* SR_BL ignored during sleep */
    memory_content *movcal_backup;
    memory_content **movcal_backup_tail;
} CPUSH4State;

/**
 * SuperHCPU:
 * @env: #CPUSH4State
 *
 * A SuperH CPU.
 */
struct ArchCPU {
    CPUState parent_obj;

    CPUSH4State env;
};

/**
 * SuperHCPUClass:
 * @parent_realize: The parent class' realize handler.
 * @parent_phases: The parent class' reset phase handlers.
 * @pvr: Processor Version Register
 * @prr: Processor Revision Register
 * @cvr: Cache Version Register
 *
 * A SuperH CPU model.
 */
struct SuperHCPUClass {
    CPUClass parent_class;

    DeviceRealize parent_realize;
    ResettablePhases parent_phases;

    uint32_t pvr;
    uint32_t prr;
    uint32_t cvr;
};

void superh_cpu_dump_state(CPUState *cpu, FILE *f, int flags);
int superh_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
int superh_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
G_NORETURN void superh_cpu_do_unaligned_access(CPUState *cpu, vaddr addr,
                                               MMUAccessType access_type, int mmu_idx,
                                               uintptr_t retaddr);

void sh4_translate_init(void);

#if !defined(CONFIG_USER_ONLY)
hwaddr superh_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
bool superh_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr);
void superh_cpu_do_interrupt(CPUState *cpu);
bool superh_cpu_exec_interrupt(CPUState *cpu, int int_req);
void cpu_sh4_invalidate_tlb(CPUSH4State *s);
uint32_t cpu_sh4_read_mmaped_itlb_addr(CPUSH4State *s,
                                       hwaddr addr);
void cpu_sh4_write_mmaped_itlb_addr(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value);
uint32_t cpu_sh4_read_mmaped_itlb_data(CPUSH4State *s,
                                       hwaddr addr);
void cpu_sh4_write_mmaped_itlb_data(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value);
uint32_t cpu_sh4_read_mmaped_utlb_addr(CPUSH4State *s,
                                       hwaddr addr);
void cpu_sh4_write_mmaped_utlb_addr(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value);
uint32_t cpu_sh4_read_mmaped_utlb_data(CPUSH4State *s,
                                       hwaddr addr);
void cpu_sh4_write_mmaped_utlb_data(CPUSH4State *s, hwaddr addr,
                                    uint32_t mem_value);
#endif

int cpu_sh4_is_cached(CPUSH4State * env, target_ulong addr);

void cpu_load_tlb(CPUSH4State * env);

#define CPU_RESOLVING_TYPE TYPE_SUPERH_CPU

/* MMU modes definitions */
#define MMU_USER_IDX 1
static inline int cpu_mmu_index (CPUSH4State *env, bool ifetch)
{
    /* The instruction in a RTE delay slot is fetched in privileged
       mode, but executed in user mode.  */
    if (ifetch && (env->flags & TB_FLAG_DELAY_SLOT_RTE)) {
        return 0;
    } else {
        return (env->sr & (1u << SR_MD)) == 0 ? 1 : 0;
    }
}

#include "exec/cpu-all.h"

/* MMU control register */
#define MMUCR    0x1F000010
#define MMUCR_AT (1<<0)
#define MMUCR_TI (1<<2)
#define MMUCR_SV (1<<8)
#define MMUCR_URC_BITS (6)
#define MMUCR_URC_OFFSET (10)
#define MMUCR_URC_SIZE (1 << MMUCR_URC_BITS)
#define MMUCR_URC_MASK (((MMUCR_URC_SIZE) - 1) << MMUCR_URC_OFFSET)
static inline int cpu_mmucr_urc (uint32_t mmucr)
{
    return ((mmucr & MMUCR_URC_MASK) >> MMUCR_URC_OFFSET);
}

/* PTEH : Page Translation Entry High register */
#define PTEH_ASID_BITS (8)
#define PTEH_ASID_SIZE (1 << PTEH_ASID_BITS)
#define PTEH_ASID_MASK (PTEH_ASID_SIZE - 1)
#define cpu_pteh_asid(pteh) ((pteh) & PTEH_ASID_MASK)
#define PTEH_VPN_BITS (22)
#define PTEH_VPN_OFFSET (10)
#define PTEH_VPN_SIZE (1 << PTEH_VPN_BITS)
#define PTEH_VPN_MASK (((PTEH_VPN_SIZE) - 1) << PTEH_VPN_OFFSET)
static inline int cpu_pteh_vpn (uint32_t pteh)
{
    return ((pteh & PTEH_VPN_MASK) >> PTEH_VPN_OFFSET);
}

/* PTEL : Page Translation Entry Low register */
#define PTEL_V        (1 << 8)
#define cpu_ptel_v(ptel) (((ptel) & PTEL_V) >> 8)
#define PTEL_C        (1 << 3)
#define cpu_ptel_c(ptel) (((ptel) & PTEL_C) >> 3)
#define PTEL_D        (1 << 2)
#define cpu_ptel_d(ptel) (((ptel) & PTEL_D) >> 2)
#define PTEL_SH       (1 << 1)
#define cpu_ptel_sh(ptel)(((ptel) & PTEL_SH) >> 1)
#define PTEL_WT       (1 << 0)
#define cpu_ptel_wt(ptel) ((ptel) & PTEL_WT)

#define PTEL_SZ_HIGH_OFFSET  (7)
#define PTEL_SZ_HIGH  (1 << PTEL_SZ_HIGH_OFFSET)
#define PTEL_SZ_LOW_OFFSET   (4)
#define PTEL_SZ_LOW   (1 << PTEL_SZ_LOW_OFFSET)
static inline int cpu_ptel_sz (uint32_t ptel)
{
    int sz;
    sz = (ptel & PTEL_SZ_HIGH) >> PTEL_SZ_HIGH_OFFSET;
    sz <<= 1;
    sz |= (ptel & PTEL_SZ_LOW) >> PTEL_SZ_LOW_OFFSET;
    return sz;
}

#define PTEL_PPN_BITS (19)
#define PTEL_PPN_OFFSET (10)
#define PTEL_PPN_SIZE (1 << PTEL_PPN_BITS)
#define PTEL_PPN_MASK (((PTEL_PPN_SIZE) - 1) << PTEL_PPN_OFFSET)
static inline int cpu_ptel_ppn (uint32_t ptel)
{
    return ((ptel & PTEL_PPN_MASK) >> PTEL_PPN_OFFSET);
}

#define PTEL_PR_BITS   (2)
#define PTEL_PR_OFFSET (5)
#define PTEL_PR_SIZE (1 << PTEL_PR_BITS)
#define PTEL_PR_MASK (((PTEL_PR_SIZE) - 1) << PTEL_PR_OFFSET)
static inline int cpu_ptel_pr (uint32_t ptel)
{
    return ((ptel & PTEL_PR_MASK) >> PTEL_PR_OFFSET);
}

/* PTEA : Page Translation Entry Assistance register */
#define PTEA_SA_BITS (3)
#define PTEA_SA_SIZE (1 << PTEA_SA_BITS)
#define PTEA_SA_MASK (PTEA_SA_SIZE - 1)
#define cpu_ptea_sa(ptea) ((ptea) & PTEA_SA_MASK)
#define PTEA_TC        (1 << 3)
#define cpu_ptea_tc(ptea) (((ptea) & PTEA_TC) >> 3)

static inline target_ulong cpu_read_sr(CPUSH4State *env)
{
    return env->sr | (env->sr_m << SR_M) |
                     (env->sr_q << SR_Q) |
                     (env->sr_t << SR_T);
}

static inline void cpu_write_sr(CPUSH4State *env, target_ulong sr)
{
    env->sr_m = (sr >> SR_M) & 1;
    env->sr_q = (sr >> SR_Q) & 1;
    env->sr_t = (sr >> SR_T) & 1;
    env->sr = sr & ~((1u << SR_M) | (1u << SR_Q) | (1u << SR_T));
}

static inline void cpu_get_tb_cpu_state(CPUSH4State *env, vaddr *pc,
                                        uint64_t *cs_base, uint32_t *flags)
{
    *pc = env->pc;
    /* For a gUSA region, notice the end of the region.  */
    *cs_base = env->flags & TB_FLAG_GUSA_MASK ? env->gregs[0] : 0;
    *flags = env->flags
            | (env->fpscr & TB_FLAG_FPSCR_MASK)
            | (env->sr & TB_FLAG_SR_MASK)
            | (env->movcal_backup ? TB_FLAG_PENDING_MOVCA : 0); /* Bit 3 */
#ifdef CONFIG_USER_ONLY
    *flags |= TB_FLAG_UNALIGN * !env_cpu(env)->prctl_unalign_sigbus;
#endif
}

#endif /* SH4_CPU_H */