📄 os_cpu_c.c
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/*
*********************************************************************************************************
@ @
@ uC/OS-II ARM porting source @
@ version 2.52 @
@ @
@ CyberLab 2003.11.25 @
@ www.armkorea.com @
@ by redizi @
@ @
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include "..\..\sources\includes.h"
/*
*********************************************************************************************************
* 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_CPU_HOOKS_EN > 0 && 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_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* 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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void OSTaskCreateHook (OS_TCB *ptcb)
{
ptcb = ptcb; /* Prevent compiler warning */
}
#endif
/*
*********************************************************************************************************
* 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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void OSTaskDelHook (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_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#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
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void OSTaskStatHook (void)
{
}
#endif
/*$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) : 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)
{
INT32U *stk;
opt = opt; /* 'opt' is not used, prevent warning */
stk = (INT32U *)ptos; /* Load stack pointer */
*(stk-1) = (INT32U)task;
*(stk-2) = (INT32U)pdata;
return ((OS_STK*)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 '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).
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void OSTaskSwHook (void)
{
}
#endif
/*
*********************************************************************************************************
* OSTCBInit() HOOK
*
* Description: This function is called by OS_TCBInit() 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_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void OSTCBInitHook (OS_TCB *ptcb)
{
INT32U *stk;
stk = (INT32U*)ptcb->OSTCBStkPtr;
#ifdef OS_TASK_USERMODE
ptcb->armReg[ 0] = (INT32U)0x00000010; /* CPSR User mode */
#else
ptcb->armReg[ 0] = (INT32U)0x0000001f; /* CPSR System mode */
#endif
ptcb->armReg[ 1] = (INT32U)*(stk-1); /* Entry Point .. -> PC */
ptcb->armReg[ 2] = (INT32U)*(stk-2); /* r0 : argument */
ptcb->armReg[ 3] = (INT32U)0; /* r1 */
ptcb->armReg[ 4] = (INT32U)0; /* r2 */
ptcb->armReg[ 5] = (INT32U)0; /* r3 */
ptcb->armReg[ 6] = (INT32U)0; /* r4 */
ptcb->armReg[ 7] = (INT32U)0; /* r5 */
ptcb->armReg[ 8] = (INT32U)0; /* r6 */
ptcb->armReg[ 9] = (INT32U)0; /* r7 */
ptcb->armReg[10] = (INT32U)0; /* r8 */
ptcb->armReg[11] = (INT32U)0; /* r9 */
ptcb->armReg[12] = (INT32U)0; /* r10 */
ptcb->armReg[13] = (INT32U)0; /* r11 */
ptcb->armReg[14] = (INT32U)0; /* r12 */
ptcb->armReg[15] = (INT32U)stk; /* r13 */
ptcb->armReg[16] = (INT32U)*(stk-1); /* r14 */
}
#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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void OSTimeTickHook (void)
{
}
#endif
#ifdef OS_TASK_USERMODE
int SWI_Handler(unsigned int num, unsigned int* reg)
{
switch(num)
{
case 0x2:
reg[0] = UCOS_DisableIRQ();
break;
case 0x3:
UCOS_RestoreIRQ(reg[0]);
break;
}
}
#endif
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