//
// rsp/cpu.h: RSP processor container.
//
// CEN64: Cycle-Accurate Nintendo 64 Emulator.
// Copyright (C) 2015, Tyler J. Stachecki.
//
// This file is subject to the terms and conditions defined in
// 'LICENSE', which is part of this source code package.
//

#ifndef __rsp_cpu_h__
#define __rsp_cpu_h__
#include "bus/controller.h"
#include "common.h"
#include "os/dynarec.h"
#include "rdp/cpu.h"
#include "rsp/cp0.h"
#include "rsp/cp2.h"
#include "rsp/pipeline.h"

enum rsp_register {
  RSP_REGISTER_R0, RSP_REGISTER_AT, RSP_REGISTER_V0,
  RSP_REGISTER_V1, RSP_REGISTER_A0, RSP_REGISTER_A1,
  RSP_REGISTER_A2, RSP_REGISTER_A3, RSP_REGISTER_T0,
  RSP_REGISTER_T1, RSP_REGISTER_T2, RSP_REGISTER_T3,
  RSP_REGISTER_T4, RSP_REGISTER_R5, RSP_REGISTER_T6,
  RSP_REGISTER_T7, RSP_REGISTER_S0, RSP_REGISTER_S1,
  RSP_REGISTER_S2, RSP_REGISTER_S3, RSP_REGISTER_S4,
  RSP_REGISTER_S5, RSP_REGISTER_S6, RSP_REGISTER_S7,
  RSP_REGISTER_T8, RSP_REGISTER_T9, RSP_REGISTER_K0,
  RSP_REGISTER_K1, RSP_REGISTER_GP, RSP_REGISTER_SP,
  RSP_REGISTER_FP, RSP_REGISTER_RA,

  // CP0 registers.
  RSP_REGISTER_CP0_0, RSP_REGISTER_CP0_1, RSP_REGISTER_CP0_2,
  RSP_REGISTER_CP0_3, RSP_REGISTER_CP0_4, RSP_REGISTER_CP0_5,
  RSP_REGISTER_CP0_6, RSP_REGISTER_CP0_7,

  // Miscellanious registers.
  NUM_RSP_REGISTERS
};

enum sp_register {
#define X(reg) reg,
#include "rsp/registers.md"
#undef X
  NUM_SP_REGISTERS,
  SP_REGISTER_OFFSET = RSP_REGISTER_CP0_0
};

#ifdef DEBUG_MMIO_REGISTER_ACCESS
extern const char *sp_register_mnemonics[NUM_SP_REGISTERS];
#endif

struct rsp {
  struct bus_controller *bus;
  struct rsp_pipeline pipeline;
  struct rsp_cp2 cp2;

  uint32_t regs[NUM_RSP_REGISTERS];
  uint8_t mem[0x2000];

  // Instead of redecoding the instructions (there's only 256 words)
  // every cycle, we maintain a 256-word decoded instruction cache.
  struct rsp_opcode opcode_cache[0x1000 / 4];
  unsigned rdp_has_pending_dl;
};

cen64_cold int rsp_init(struct rsp *rsp, struct bus_controller *bus);
cen64_cold void rsp_late_init(struct rsp *rsp);
cen64_cold void rsp_destroy(struct rsp *rsp);

cen64_flatten cen64_hot void rsp_cycle_(struct rsp *rsp);

cen64_flatten cen64_hot static inline void rsp_cycle(struct rsp *rsp) {
  if (rsp->regs[RSP_CP0_REGISTER_SP_STATUS] & SP_STATUS_HALT)
    return;

  rsp_cycle_(rsp);
}

#endif