/*
*********************************************************************************************************
*                                              uC/OS-III
*                                        The Real-Time Kernel
*
*                    Copyright 2009-2020 Silicon Laboratories Inc. www.silabs.com
*
*                                 SPDX-License-Identifier: APACHE-2.0
*
*               This software is subject to an open source license and is distributed by
*                Silicon Laboratories Inc. pursuant to the terms of the Apache License,
*                    Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
*
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*
*                                       Renesas RX Specific Code
*
* File      : os_cpu_c.c
* Version   : V3.08.00
*********************************************************************************************************
* For       : Renesas RX
* Toolchain : HEW      with GNURX compiler
*             E2STUDIO with GNURX compiler
*********************************************************************************************************
*/

#define   OS_CPU_GLOBALS

#ifdef VSC_INCLUDE_SOURCE_FILE_NAMES
const  CPU_CHAR  *os_cpu_c__c = "$Id: $";
#endif


/*
*********************************************************************************************************
*                                             INCLUDE FILES
*********************************************************************************************************
*/

#include  "../../../../Source/os.h"


#ifdef __cplusplus
extern  "C" {
#endif


/*
*********************************************************************************************************
*                                             LOCAL DEFINES
*********************************************************************************************************
*/

#define  PSW_INIT                                 0x00030000u

                                                                /* ------ SOFTWARE INTERRUPT ACTIVATION REGISTERS ----- */
#define  ICU_BASE_ADDR                            0x00087000u
#define  ICU_REG_IR027_SWINT                     (*(CPU_REG08 *)(ICU_BASE_ADDR + 0x01Bu))
#define  ICU_REG_IER03_SWINT                     (*(CPU_REG08 *)(ICU_BASE_ADDR + 0x203u))
#define  ICU_REG_SWINTR                          (*(CPU_REG08 *)(ICU_BASE_ADDR + 0x2E0u))
#define  ICU_REG_IPR003_SWINT                    (*(CPU_REG08 *)(ICU_BASE_ADDR + 0x303u))

#define  ICU_SWINTR_BIT_SWINT                     0x01u
#define  ICU_IER03_BIT_SWINT                      0x08u


/*
*********************************************************************************************************
*                                       LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/

CPU_INT32U  OS_KA_IPL_Boundary;                              /* IPL boundary.                                        */


/*
*********************************************************************************************************
*                                           IDLE TASK HOOK
*
* Description: This function is called by the idle task.  This hook has been added to allow you to do
*              such things as STOP the CPU to conserve power.
*
* Arguments  : None.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSIdleTaskHook (void)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppIdleTaskHookPtr != (OS_APP_HOOK_VOID)0) {
        (*OS_AppIdleTaskHookPtr)();
    }
#endif
}


/*
*********************************************************************************************************
*                                       OS INITIALIZATION HOOK
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments  : None.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSInitHook (void)
{
    ICU_REG_IR027_SWINT   = 0u;                                 /* Ensure the software interrupt is clear.              */
    ICU_REG_IPR003_SWINT  = 1u;                                 /* Pended context switches must be level 1 IPL          */
    ICU_REG_IER03_SWINT  |= ICU_IER03_BIT_SWINT;                /* Enable the software interrupt.                       */

    OS_KA_IPL_Boundary = CPU_CFG_KA_IPL_BOUNDARY << 24u;        /* Set IPL boundary from the configuration.             */
}


/*
*********************************************************************************************************
*                                           REDZONE HIT HOOK
*
* Description: This function is called when a task's stack overflowed.
*
* Arguments  : p_tcb        Pointer to the task control block of the offending task. NULL if ISR.
*
* Note(s)    : None.
*********************************************************************************************************
*/
#if (OS_CFG_TASK_STK_REDZONE_EN > 0u)
void  OSRedzoneHitHook (OS_TCB  *p_tcb)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppRedzoneHitHookPtr != (OS_APP_HOOK_TCB)0) {
        (*OS_AppRedzoneHitHookPtr)(p_tcb);
    } else {
        CPU_SW_EXCEPTION(;);
    }
#else
    (void)p_tcb;                                                /* Prevent compiler warning                             */
    CPU_SW_EXCEPTION(;);
#endif
}
#endif


/*
*********************************************************************************************************
*                                         STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-III's statistics task.  This allows your
*              application to add functionality to the statistics task.
*
* Arguments  : None.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSStatTaskHook (void)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppStatTaskHookPtr != (OS_APP_HOOK_VOID)0) {
        (*OS_AppStatTaskHookPtr)();
    }
#endif
}


/*
*********************************************************************************************************
*                                          TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments  : p_tcb        Pointer to the task control block of the task being created.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSTaskCreateHook (OS_TCB  *p_tcb)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppTaskCreateHookPtr != (OS_APP_HOOK_TCB)0) {
        (*OS_AppTaskCreateHookPtr)(p_tcb);
    }
#else
    (void)p_tcb;                                                /* Prevent compiler warning                             */
#endif
}


/*
*********************************************************************************************************
*                                           TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments  : p_tcb        Pointer to the task control block of the task being deleted.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSTaskDelHook (OS_TCB  *p_tcb)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppTaskDelHookPtr != (OS_APP_HOOK_TCB)0) {
        (*OS_AppTaskDelHookPtr)(p_tcb);
    }
#else
    (void)p_tcb;                                                /* Prevent compiler warning                             */
#endif
}


/*
*********************************************************************************************************
*                                            TASK RETURN HOOK
*
* Description: This function is called if a task accidentally returns.  In other words, a task should
*              either be an infinite loop or delete itself when done.
*
* Arguments  : p_tcb        Pointer to the task control block of the task that is returning.
*
* Note(s)    : None.
*********************************************************************************************************
*/

void  OSTaskReturnHook (OS_TCB  *p_tcb)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppTaskReturnHookPtr != (OS_APP_HOOK_TCB)0) {
        (*OS_AppTaskReturnHookPtr)(p_tcb);
    }
#else
    (void)p_tcb;                                                /* Prevent compiler warning                             */
#endif
}


/*
**********************************************************************************************************
*                                       INITIALIZE A TASK'S STACK
*
* Description: This function is called by OS_Task_Create() or OSTaskCreateExt() to initialize the stack
*              frame of the task being created. This function is highly processor specific.
*
* Arguments  : p_task       Pointer to the task entry point address.
*
*              p_arg        Pointer to a user supplied data area that will be passed to the task
*                               when the task first executes.
*
*              p_stk_base   Pointer to the base address of the stack.
*
*              stk_size     Size of the stack, in number of CPU_STK elements.
*
*              opt          Options used to alter the behavior of OS_Task_StkInit().
*                            (see OS.H for OS_TASK_OPT_xxx).
*
* Returns    : Always returns the location of the new top-of-stack' once the processor registers have
*              been placed on the stack in the proper order.
*
* Note(s)    : 1) Interrupts are enabled when task starts executing.
**********************************************************************************************************
*/

CPU_STK  *OSTaskStkInit (OS_TASK_PTR    p_task,
                         void          *p_arg,
                         CPU_STK       *p_stk_base,
                         CPU_STK       *p_stk_limit,
                         CPU_STK_SIZE   stk_size,
                         OS_OPT         opt)
{
    CPU_STK  *p_stk;


    (void)p_stk_limit;                                          /* Prevent compiler warning                             */
    (void)opt;

    p_stk    = &p_stk_base[stk_size];                           /* Load stack pointer                                   */
    *--p_stk = (CPU_STK)PSW_INIT;                               /* PSW                                                  */
    *--p_stk = (CPU_STK)p_task;                                 /* PC of task                                           */
    *--p_stk = 0x15151515u;                                     /* R15                                                  */
    *--p_stk = 0x14141414u;                                     /* R14                                                  */
    *--p_stk = 0x13131313u;                                     /* R13                                                  */
    *--p_stk = 0x12121212u;                                     /* R12                                                  */
    *--p_stk = 0x11111111u;                                     /* R11                                                  */
    *--p_stk = 0x10101010u;                                     /* R10                                                  */
    *--p_stk = 0x09090909u;                                     /* R9                                                   */
    *--p_stk = 0x08080808u;                                     /* R8                                                   */
    *--p_stk = 0x07070707u;                                     /* R7                                                   */
    *--p_stk = 0x06060606u;                                     /* R6                                                   */
    *--p_stk = 0x05050505u;                                     /* R5                                                   */
    *--p_stk = 0x04040404u;                                     /* R4                                                   */
    *--p_stk = 0x03030303u;                                     /* R3                                                   */
    *--p_stk = 0x02020202u;                                     /* R2                                                   */
    *--p_stk = (CPU_STK)p_arg;                                  /* Pass p_arg in R1                                     */

#if (defined(__RX_FPU_INSNS__) && (__RX_FPU_INSNS__==1))
    *--p_stk = 0x00000100u;                                     /* FPSW                                                 */
#endif


    *--p_stk = 0x00009ABCu;                                     /* ACC (mid, lower word)                                */
    *--p_stk = 0x12345678u;                                     /* ACC (high)                                           */

    return (p_stk);
}


/*
*********************************************************************************************************
*                                           TASK SWITCH HOOK
*
* Description: This function is called when a task switch is performed.  This allows you to perform other
*              operations during a context switch.
*
* Arguments  : None.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*              2) It is assumed that the global pointer 'OSTCBHighRdyPtr' points to the TCB of the task
*                 that will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCurPtr' points
*                 to the task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/

void  OSTaskSwHook (void)
{
#if OS_CFG_TASK_PROFILE_EN > 0u
    CPU_TS  ts;
#endif
#ifdef  CPU_CFG_INT_DIS_MEAS_EN
    CPU_TS  int_dis_time;
#endif
#if (OS_CFG_TASK_STK_REDZONE_EN > 0u)
    CPU_BOOLEAN  stk_status;
#endif


#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppTaskSwHookPtr != (OS_APP_HOOK_VOID)0) {
        (*OS_AppTaskSwHookPtr)();
    }
#endif

    OS_TRACE_TASK_SWITCHED_IN(OSTCBHighRdyPtr);

#if OS_CFG_TASK_PROFILE_EN > 0u
    ts = OS_TS_GET();
    if (OSTCBCurPtr != OSTCBHighRdyPtr) {
        OSTCBCurPtr->CyclesDelta  = ts - OSTCBCurPtr->CyclesStart;
        OSTCBCurPtr->CyclesTotal += (OS_CYCLES)OSTCBCurPtr->CyclesDelta;
    }

    OSTCBHighRdyPtr->CyclesStart = ts;
#endif

#ifdef  CPU_CFG_INT_DIS_MEAS_EN
    int_dis_time = CPU_IntDisMeasMaxCurReset();                 /* Keep track of per-task interrupt disable time        */
    if (OSTCBCurPtr->IntDisTimeMax < int_dis_time) {
        OSTCBCurPtr->IntDisTimeMax = int_dis_time;
    }
#endif

#if OS_CFG_SCHED_LOCK_TIME_MEAS_EN > 0u
                                                                /* Keep track of per-task scheduler lock time           */
    if (OSTCBCurPtr->SchedLockTimeMax < OSSchedLockTimeMaxCur) {
        OSTCBCurPtr->SchedLockTimeMax = OSSchedLockTimeMaxCur;
    }
    OSSchedLockTimeMaxCur = (CPU_TS)0;                          /* Reset the per-task value                             */
#endif

#if (OS_CFG_TASK_STK_REDZONE_EN > 0u)
                                                                /* Check if stack overflowed.                           */
    stk_status = OSTaskStkRedzoneChk((OS_TCB *)0u);
    if (stk_status != OS_TRUE) {
        OSRedzoneHitHook(OSTCBCurPtr);
    }
#endif
}


/*
*********************************************************************************************************
*                                              TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments  : None.
*
* Note(s)    : 1) This function is assumed to be called from the Tick ISR.
*********************************************************************************************************
*/

void  OSTimeTickHook (void)
{
#if OS_CFG_APP_HOOKS_EN > 0u
    if (OS_AppTimeTickHookPtr != (OS_APP_HOOK_VOID)0) {
        (*OS_AppTimeTickHookPtr)();
    }
#endif
#if (CPU_CFG_TS_EN > 0u)
    CPU_TS_Update();
#endif
}


/*
*********************************************************************************************************
*                                            Context Switch
*
* Description: This function is called to switch task context (called from task)
*
* Arguments  : None.
*********************************************************************************************************
*/

void  OSCtxSw(void)
{
    ICU_REG_SWINTR = ICU_SWINTR_BIT_SWINT;                      /* Trigger the pended interrupt request                 */
}


/*
*********************************************************************************************************
*                                       Context Switch from ISR
*
* Description: This function is called to switch task context (called from isr)
*
* Arguments  : None.
*********************************************************************************************************
*/

void  OSIntCtxSw(void)
{
    ICU_REG_SWINTR = ICU_SWINTR_BIT_SWINT;                      /* Trigger the pended interrupt request                 */
}


#ifdef __cplusplus
}
#endif
