Os_cpu_c.c
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上传日期:2017-08-10
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- /*
- *********************************************************************************************************
- * uC/OS-II
- * The Real-Time Kernel
- *
- * (c) Copyright 1992-2003, Micrium, Inc., Weston, FL
- * All Rights Reserved
- *
- * ARM9 Port
- *
- * File : OS_CPU_C.C
- *********************************************************************************************************
- */
- //#define OS_CPU_GLOBALS
- #include "ucos_ii.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
- *
- * p_arg 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) Interrupts are enabled when your task starts executing.
- * 2) All tasks run in SVC mode.
- *********************************************************************************************************
- */
- OS_STK *OSTaskStkInit (void (*task)(void *pd), void *p_arg, OS_STK *ptos, INT16U opt)
- {
- OS_STK *stk;
- opt = opt; /* 'opt' is not used, prevent warning */
-
- stk = ptos; /* Load stack pointer */
-
- *(stk) = (OS_STK)task; /* Entry Point */
- *(--stk) = (INT32U)0; /* LR */
- *(--stk) = (INT32U)0; /* R12 */
- *(--stk) = (INT32U)0; /* R11 */
- *(--stk) = (INT32U)0; /* R10 */
- *(--stk) = (INT32U)0; /* R9 */
- *(--stk) = (INT32U)0; /* R8 */
- *(--stk) = (INT32U)0; /* R7 */
- *(--stk) = (INT32U)0; /* R6 */
- *(--stk) = (INT32U)0; /* R5 */
- *(--stk) = (INT32U)0; /* R4 */
- *(--stk) = (INT32U)0; /* R3 */
- *(--stk) = (INT32U)0; /* R2 */
- *(--stk) = (INT32U)0; /* R1 */
- *(--stk) = (INT32U)p_arg; /* R0 : argument */
- *(--stk) = (INT32U)0x00000013L; /* CPSR (SVC mode, Enable both IRQ and FIQ interrupts) */
-
- return (stk);
- }
- #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)
- {
- }
- /*
- *********************************************************************************************************
- * 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
- /*
- *********************************************************************************************************
- * 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)
- {
- }
- /*
- *********************************************************************************************************
- * 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