📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
* All Rights Reserved
* (c) Copyright ARM Limited 1999. All rights reserved.
*
* ARM Specific code
*
*
* File : OS_CPU_C.C
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include "includes.h"
/*
*********************************************************************************************************
* INITIALIZE A TASK'S STACK
*
* Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the
* stack frame of the task being created. This function is highly processor specific.
*
* Arguments : task is a pointer to the task code
*
* pdata is a pointer to a user supplied data area that will be passed to the task
* when the task first executes.
*
* ptos is a pointer to the top of stack. It is assumed that 'ptos' points to
* a 'free' entry on the task stack. If OS_STK_GROWTH is set to 1 then
* 'ptos' will contain the HIGHEST valid address of the stack. Similarly, if
* OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address
* of the stack.
*
* opt specifies options that can be used to alter the behavior of OSTaskStkInit().
* (see uCOS_II.H for OS_TASK_OPT_???).
*
* 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) : Interrupts are enabled when your task starts executing. You can change this by setting the
* PSW to 0x0002 instead. In this case, interrupts would be disabled upon task startup. The
* application code would be responsible for enabling interrupts at the beginning of the task
* code. You will need to modify OSTaskIdle() and OSTaskStat() so that they enable
* interrupts. Failure to do this will make your system crash!
*********************************************************************************************************
*/
OS_STK * OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
unsigned int *stk;
opt = opt; /* 'opt' is not used, prevent warning */
stk = (unsigned int *)ptos; /* Load stack pointer */
/* build a context for the new task */
*--stk = (unsigned int) task; /* pc */
*--stk = (unsigned int) task; /* lr */
*--stk = 0; /* r12 */
*--stk = 0; /* r11 */
*--stk = 0; /* r10 */
*--stk = 0; /* r9 */
*--stk = 0; /* r8 */
*--stk = 0; /* r7 */
*--stk = 0; /* r6 */
*--stk = 0; /* r5 */
*--stk = 0; /* r4 */
*--stk = 0; /* r3 */
*--stk = 0; /* r2 */
*--stk = 0; /* r1 */
*--stk = (unsigned int) pdata; /* r0 */
*--stk = (SVC32MODE|0x40); /* cpsr FIQ disable*/
// *--stk = (SVC32MODE|0x40); /* spsr FIQ disable */
return ((OS_STK *)stk);
}
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments : ptcb is a pointer to the task control block of the task being created.
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
void OSTaskCreateHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
/*
*********************************************************************************************************
* TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments : ptcb is a pointer to the task control block of the task being deleted.
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
void OSTaskDelHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
/*
*********************************************************************************************************
* 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 'OSTCBHighRdy' points to the TCB of the task that
* will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
* task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
#if 0
printf("------------------------------------------\n");
printf("\t\tOSTCBCur\tOSTCBHighRdy\n");
printf("OSTCBPrio:\t%d\t\t%d\n",OSTCBCur->OSTCBPrio,OSTCBHighRdy->OSTCBPrio);
printf("OSTCBStkPtr:\t%p\t%p\n",OSTCBCur->OSTCBStkPtr,OSTCBHighRdy->OSTCBStkPtr);
// printf("OSTCBEventPtr:\t%p\t%p\n",OSTCBCur->OSTCBEventPtr,OSTCBHighRdy->OSTCBEventPtr);
// printf("OSTCBMsg:\t%p\t%p\n",OSTCBCur->OSTCBMsg,OSTCBHighRdy->OSTCBMsg);
printf("Point:\t\t%p\t%p\n",OSTCBCur,OSTCBHighRdy);
printf("OSTCBDly:\t%d\t\t%d\n",OSTCBCur->OSTCBDly,OSTCBHighRdy->OSTCBDly);
// printf("OSTCBStat:\t%d\t%d\n",OSTCBCur->OSTCBStat,OSTCBHighRdy->OSTCBStat);
// printf("OSTCBX:\t\t%d\t%d\n",OSTCBCur->OSTCBX,OSTCBHighRdy->OSTCBX);
// printf("OSTCBY:\t\t%d\t%d\n",OSTCBCur->OSTCBY,OSTCBHighRdy->OSTCBY);
// printf("OSTCBBitX:\t%d\t%d\n",OSTCBCur->OSTCBBitX,OSTCBHighRdy->OSTCBBitX);
// printf("OSTCBBitY:\t%d\t%d\n",OSTCBCur->OSTCBBitY,OSTCBHighRdy->OSTCBBitY);
#endif
}
/*
*********************************************************************************************************
* STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-II's statistics task. This allows your
* application to add functionality to the statistics task.
*
* Arguments : none
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
#if 0
printf ( "OSTaskStatHook \n" );
#endif
}
/*
*********************************************************************************************************
* TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments : none
*
* Note(s) : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
#if 0
OS_TCB *ptcb;
ptcb = OSTCBList; /* Point at first TCB in TCB list */
printf( "\n############### OSTimeTickHook ###################\n" );
printf( "*****************************************\n" );
while (ptcb->OSTCBPrio != OS_IDLE_PRIO)
{ /* Go through all TCBs in TCB list */
OS_ENTER_CRITICAL();
printf( "ptcb->OSTCBPrio = %d ", ptcb->OSTCBPrio );
printf("ptcb->OSTCBStkPtr = %p ",ptcb->OSTCBStkPtr);
printf( "ptcb->OSTCBDly = %d ", ptcb->OSTCBDly );
printf( "\n" );
ptcb = ptcb->OSTCBNext; /* Point at next TCB in TCB list */
OS_EXIT_CRITICAL();
}
printf( "\n*****************************************\n" );
#endif
}
#endif
void InitHookEnd (void)
{
}
void OSTCBInitHook (OS_TCB *ptcb)
{
#if 0
ptcb = ptcb; /* Prevent Compiler warning */
{ /* Go through all TCBs in TCB list */
printf( "\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ \n " );
printf( "ptcb->OSTCBPrio = %d ", ptcb->OSTCBPrio );
printf("ptcb->OSTCBStkPtr = %p ",ptcb->OSTCBStkPtr);
printf( "ptcb->OSTCBDly = %d ", ptcb->OSTCBDly );
ptcb = ptcb->OSTCBNext; /* Point at next TCB in TCB list */
printf( "\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ \n " );
}
#endif
}
void OSTaskIdleHook (void)
{
}
void OSInitHookBegin (void)
{
#if 0
printf ( "OSInitHookBegin \n" );
#endif
}
void OSInitHookEnd (void)
{
#if 0
printf ( "OSInitHookEnd \n" );
#endif
}
void OS_FlagInit(void)
{
}
void OS_FlagUnlink(OS_FLAG_NODE *pnode)
{
}
INT32U OSIntCtxSwFlag = 0; /* Used to flag a context switch */
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