📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 2000, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
*
* MCF5272 Specific code
*
* File : OS_CPU_C.C
* Modified By : Mark Medonis
* Sekidenko Inc - An Advanced Energy Company
* mark.medonis@aei.com
* 4/16/2002
*********************************************************************************************************
*/
#include "INCLUDES.H"
/*
*********************************************************************************************************
* REVISION HISTORY
* Rev 0.a
* Initial verison. Added new function OSTaskIdleHook, for version 2.51 of uC/OS.
* M. Medonis 4/16/2002
*
* $Log$
*
*********************************************************************************************************
*/
/*$PAGE*/
/*
*********************************************************************************************************
* 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) : 1) The initial value of the Status Register (SR) is OS_INITIAL_SR sets the 683xx processor
* to run in SUPERVISOR mode. It is assumed that all uC/OS-II tasks run in supervisor
* mode.
* 2) You can pass the above options in the 'opt' argument. You MUST only use the upper
* 8 bits of 'opt' because the lower bits are reserved by uC/OS-II. If you make changes
* to the code below, you will need to ensure that it doesn't affect the behaviour of
* OSTaskIdle() and OSTaskStat().
* 3) Registers are initialized to make them easy to differentiate with a debugger.
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
INT32U *pstk32;
INT32U stkframe;
opt = opt; /* 'opt' is not used, prevent compiler warning */
pstk32 = (INT32U *)((INT32U)ptos);
stkframe = 0x40000000; /* Start setting up format field of status word */
switch( (INT32U)ptos & 0x00000003 ) /* Align the stack on a longword boundary */
{
#define LOFFSETBY(src, o) (OS_STK *)((INT32U)(src) + (o))
case 0:
pstk32 = LOFFSETBY(pstk32, -0);
break;
case 1:
pstk32 = LOFFSETBY(pstk32, -1);
break;
case 2:
pstk32 = LOFFSETBY(pstk32, -2);
break;
case 3:
pstk32 = LOFFSETBY(pstk32, -3);
break;
#undef LOFFSETBY
}
stkframe |= OS_INITIAL_SR;
*pstk32 = 0; /* -- SIMULATE CALL TO FUNCTION WITH ARGUMENT -- */
*--pstk32 = (INT32U)pdata; /* pdata */
*--pstk32 = (INT32U)task; /* Task return address */
/* ------ SIMULATE INTERRUPT STACK FRAME ------- */
*--pstk32 = (INT32U)task; /* Task return address */
*--pstk32 = (INT32U)stkframe; /* format and status register */
/* ------- SAVE ALL PROCESSOR REGISTERS -------- */
*--pstk32 = (INT32U)0x00A600A6L; /* Register A6 */
*--pstk32 = (INT32U)0x00A500A5L; /* Register A5 */
*--pstk32 = (INT32U)0x00A400A4L; /* Register A4 */
*--pstk32 = (INT32U)0x00A300A3L; /* Register A3 */
*--pstk32 = (INT32U)0x00A200A2L; /* Register A2 */
*--pstk32 = (INT32U)0x00A100A1L; /* Register A1 */
*--pstk32 = (INT32U)0x00A000A0L; /* Register A0 */
*--pstk32 = (INT32U)0x00D700D7L; /* Register D7 */
*--pstk32 = (INT32U)0x00D600D6L; /* Register D6 */
*--pstk32 = (INT32U)0x00D500D5L; /* Register D5 */
*--pstk32 = (INT32U)0x00D400D4L; /* Register D4 */
*--pstk32 = (INT32U)0x00D300D3L; /* Register D3 */
*--pstk32 = (INT32U)0x00D200D2L; /* Register D2 */
*--pstk32 = (INT32U)0x00D100D1L; /* Register D1 */
*--pstk32 = (INT32U)0x00D000D0L; /* Register D0 */
return ((OS_STK *)pstk32); /* Return pointer to new top-of-stack */
}
/*$PAGE*/
/*
*********************************************************************************************************
* Set the CPU's Status Register
*
* Description: This function is used internally and may be called externally in order to set the CPU's
* Status Register (SR). This is called primarily when masking/unmasking interrupts.
*
* Arguments : value New Status Register value.
*
* Returns : None.
*
* Note : This function is INTERNAL/EXTERNAL to uC/OS-II and your application may call it.
*********************************************************************************************************
*/
INT16U CPUSetSR(INT16U value)
{
asm
{
move.w sr,d0 // get the current SR
move.w value,d1 // value in memory
move.w d1,sr // put in SR
}
}
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSInitHookBegin (void)
{
}
#endif
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (END)
*
* Description: This function is called by OSInit() at the end of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif
/*
*********************************************************************************************************
* 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)
{
}
/*
*********************************************************************************************************
* 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)
{
}
/*
*********************************************************************************************************
* 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)
{
}
/*
*********************************************************************************************************
* OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() after setting up most of the TCB.
*
* Arguments : ptcb is a pointer to the TCB of the task being created.
*
* Note(s) : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSTCBInitHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent Compiler warning */
}
#endif
/*
*********************************************************************************************************
* 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) : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#endif
#endif
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