/* frv simulator support code
   Copyright (C) 1999-2025 Free Software Foundation, Inc.
   Contributed by Red Hat.

This file is part of the GNU simulators.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This must come before any other includes.  */
#include "defs.h"

#define WANT_CPU
#define WANT_CPU_FRVBF

#include "sim-main.h"
#include "bfd.h"
#include "cgen-mem.h"

/* Initialize the frv simulator.  */
void
frv_initialize (SIM_CPU *current_cpu, SIM_DESC sd)
{
  FRV_PROFILE_STATE *ps = CPU_PROFILE_STATE (current_cpu);
  PROFILE_DATA *p = CPU_PROFILE_DATA (current_cpu);
  FRV_CACHE *insn_cache = CPU_INSN_CACHE (current_cpu);
  FRV_CACHE *data_cache = CPU_DATA_CACHE (current_cpu);
  int insn_cache_enabled = CACHE_INITIALIZED (insn_cache);
  int data_cache_enabled = CACHE_INITIALIZED (data_cache);
  USI hsr0;

  /* Initialize the register control information first since some of the
     register values are used in further configuration.  */
  frv_register_control_init (current_cpu);

  /* We need to ensure that the caches are initialized even if they are not
     initially enabled (via commandline) because they can be enabled by
     software.  */
  if (! insn_cache_enabled)
    frv_cache_init (current_cpu, CPU_INSN_CACHE (current_cpu));
  if (! data_cache_enabled)
    frv_cache_init (current_cpu, CPU_DATA_CACHE (current_cpu));

  /* Set the default cpu frequency if it has not been set on the command
     line.  */
  if (PROFILE_CPU_FREQ (p) == 0)
    PROFILE_CPU_FREQ (p) = 266000000; /* 266MHz */

  /* Allocate one cache line of memory containing the address of the reset
     register Use the largest of the insn cache line size and the data cache
     line size.  */
  {
    int addr = RSTR_ADDRESS;
    void *aligned_buffer;
    int bytes;

    if (CPU_INSN_CACHE (current_cpu)->line_size
	> CPU_DATA_CACHE (current_cpu)->line_size)
      bytes = CPU_INSN_CACHE (current_cpu)->line_size;
    else
      bytes = CPU_DATA_CACHE (current_cpu)->line_size;

    /* 'bytes' is a power of 2. Calculate the starting address of the
       cache line.  */
    addr &= ~(bytes - 1);
    aligned_buffer = zalloc (bytes); /* clear */
    sim_core_attach (sd, NULL, 0, access_read_write, 0, addr, bytes,
		     0, NULL, aligned_buffer);
  }

  PROFILE_INFO_CPU_CALLBACK(p) = frv_profile_info;
  ps->insn_fetch_address = -1;
  ps->branch_address = -1;

  cgen_init_accurate_fpu (current_cpu, CGEN_CPU_FPU (current_cpu),
			  frvbf_fpu_error);

  /* Now perform power-on reset.  */
  frv_power_on_reset (current_cpu);

  /* Make sure that HSR0.ICE and HSR0.DCE are set properly.  */
  hsr0 = GET_HSR0 ();
  if (insn_cache_enabled)
    SET_HSR0_ICE (hsr0);
  else
    CLEAR_HSR0_ICE (hsr0);
  if (data_cache_enabled)
    SET_HSR0_DCE (hsr0);
  else
    CLEAR_HSR0_DCE (hsr0);
  SET_HSR0 (hsr0);
}

/* Initialize the frv simulator.  */
void
frv_term (SIM_DESC sd)
{
  /* If the timer is enabled, and model profiling was not originally enabled,
     then turn it off again.  This is the only place we can currently gain
     control to do this.  */
  if (frv_interrupt_state.timer.enabled && ! frv_save_profile_model_p)
    sim_profile_set_option (sd, "-model", PROFILE_MODEL_IDX, "0");
}

/* Perform a power on reset.  */
void
frv_power_on_reset (SIM_CPU *cpu)
{
  /* GR, FR and CPR registers are undefined at initialization time.  */
  frv_initialize_spr (cpu);
  /* Initialize the RSTR register (in memory).  */
  if (frv_cache_enabled (CPU_DATA_CACHE (cpu)))
    frvbf_mem_set_SI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_INITIAL_VALUE);
  else
    SETMEMSI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_INITIAL_VALUE);
}

/* Perform a hardware reset.  */
void
frv_hardware_reset (SIM_CPU *cpu)
{
  /* GR, FR and CPR registers are undefined at hardware reset.  */
  frv_initialize_spr (cpu);
  /* Reset the RSTR register (in memory).  */
  if (frv_cache_enabled (CPU_DATA_CACHE (cpu)))
    frvbf_mem_set_SI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_HARDWARE_RESET);
  else
    SETMEMSI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_HARDWARE_RESET);
  /* Reset the insn and data caches.  */
  frv_cache_invalidate_all (CPU_INSN_CACHE (cpu), 0/* no flush */);
  frv_cache_invalidate_all (CPU_DATA_CACHE (cpu), 0/* no flush */);
}

/* Perform a software reset.  */
void
frv_software_reset (SIM_CPU *cpu)
{
  /* GR, FR and CPR registers are undefined at software reset.  */
  frv_reset_spr (cpu);
  /* Reset the RSTR register (in memory).  */
  if (frv_cache_enabled (CPU_DATA_CACHE (cpu)))
    frvbf_mem_set_SI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_SOFTWARE_RESET);
  else
    SETMEMSI (cpu, CPU_PC_GET (cpu), RSTR_ADDRESS, RSTR_SOFTWARE_RESET);
}
