📄 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
*
*
* Texas Instruments TMS320C40 Specific Code
* SMALL MEMORY MODEL
*
* File : OS_CPU_C.C
* By : Jean J. Labrosse
* Modified by: Ran Cabell
*********************************************************************************************************
*/
#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
* ST to 0x0000 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!
*********************************************************************************************************
*/
void *OSTaskStkInit (void (*task)(void *pd), void *pdata, void *ptos, INT16U opt)
{
INT16U *stk;
stk = (INT16U *)ptos; /* Load stack pointer */
*stk++ = (INT16U)pdata; /* Argument 0 */
*stk++ = (INT16U)task; /* Return Address - should never get called */
*stk++ = (INT16U)task; /* Interrupt return address - the task entry point */
*stk++ = (INT16U)0x4C00; /* ST = PGIE, CE, CF high; GIE, PCF low */
*stk++ = (INT16U)0x0; /* AR0 */
*stk++ = (INT16U)0x1; /* AR1 */
*stk++ = (INT16U)0x2; /* AR2 */
*stk++ = (INT16U)0x3; /* AR3 */
*stk++ = (INT16U)0x4; /* AR4 */
*stk++ = (INT16U)0x5; /* AR5 */
*stk++ = (INT16U)0x6; /* AR6 */
*stk++ = (INT16U)0x7; /* AR7 */
*stk++ = (INT16U)0x0; /* IR0 */
*stk++ = (INT16U)0x0; /* IR1 */
*stk++ = (INT16U)0x0; /* BK */
*stk++ = (INT16U)0x0; /* RS */
*stk++ = (INT16U)0x0; /* RE */
*stk++ = (INT16U)0x0; /* RC */
*stk++ = (INT16U)0x0; /* R0 */
*stk++ = (INT16U)0x11; /* R1 */
*stk++ = (INT16U)0x22; /* R2 */
*stk++ = (INT16U)0x33; /* R3 */
*stk++ = (INT16U)0x44; /* R4 */
*stk++ = (INT16U)0x55; /* R5 */
*stk++ = (INT16U)0x66; /* R6 */
*stk++ = (INT16U)0x77; /* R7 */
*stk++ = (INT16U)0x0; /* F0 */
*stk++ = (INT16U)0x11; /* F1 */
*stk++ = (INT16U)0x22; /* F2 */
*stk++ = (INT16U)0x33; /* F3 */
*stk++ = (INT16U)0x44; /* F4 */
*stk++ = (INT16U)0x55; /* F5 */
*stk++ = (INT16U)0x66; /* F6 */
*stk++ = (INT16U)0x77; /* F7 */
*stk++ = (INT16U)0x88; /* R8 */
*stk++ = (INT16U)0x99; /* R9 */
*stk++ = (INT16U)0xAA; /* R10 */
*stk++ = (INT16U)0xBB; /* R11 */
*stk++ = (INT16U)0x88; /* F8 */
*stk++ = (INT16U)0x99; /* F9 */
*stk++ = (INT16U)0xAA; /* F10 */
*stk = (INT16U)0xBB; /* F11 */
/* Don't save the following: */
/* *stk++ = (INT16U)0x0; */ /* DP - small memory model */
/* *stk++ = (INT16U)0x0; */ /* DIE - assume these don't change from task to task */
/* *stk++ = (INT16U)0x0; */ /* IIE */
/* *stk++ = (INT16U)0x0; */ /* IIF */
return ((void *)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)
{
}
/*
*********************************************************************************************************
* 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)
{
}
#endif
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