/****************************************************************************
 * arch/tricore/src/common/tricore_initialstate.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/types.h>
#include <stdint.h>
#include <string.h>

#include <nuttx/arch.h>
#include <nuttx/tls.h>
#include <arch/irq.h>

#include "tricore_internal.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_initial_state
 *
 * Description:
 *   A new thread is being started and a new TCB
 *   has been created. This function is called to initialize
 *   the processor specific portions of the new TCB.
 *
 *   This function must setup the initial architecture registers
 *   and/or  stack so that execution will begin at tcb->start
 *   on the next context switch.
 *
 ****************************************************************************/

void up_initial_state(struct tcb_s *tcb)
{
  struct xcptcontext *xcp = &tcb->xcp;
  uintptr_t pcxi;

  /* Reclaim possible CSA links */

  pcxi = xcp->regs ? tricore_addr2csa(xcp->regs + TC_CONTEXT_REGS) : 0;
  if (pcxi & FCX_FREE)
    {
      tricore_reclaim_csa(pcxi);
    }

  /* Initialize the initial exception register context structure */

  memset(xcp, 0, sizeof(struct xcptcontext));

  /* Initialize the idle thread stack */

  if (tcb->pid == IDLE_PROCESS_ID)
    {
      up_cpu_idlestack(up_cpu_index(), tcb,
                       CONFIG_IDLETHREAD_STACKSIZE);
      tricore_set_tls_info(tcb->stack_alloc_ptr);

#ifdef CONFIG_STACK_COLORATION
      /* If stack debug is enabled, then fill the stack with a
       * recognizable value that we can use later to test for high
       * water marks.
       */

      tricore_stack_color(tcb->stack_alloc_ptr, 0);
#endif /* CONFIG_STACK_COLORATION */
      return;
    }

  xcp->regs = tricore_alloc_csa(tcb,
                                (uintptr_t)tcb->start,
                                (uintptr_t)tcb->stack_base_ptr +
                                           tcb->adj_stack_size,
                                PSW_IO_SUPERVISOR | PSW_CDE, false);
}