?? os_cpu_c.c
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/*********************************************************************************************************** uC/OS-II* The Real-Time Kernel** (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL* All Rights Reserved** File : OS_CPU_C.C* By : Jean J. Labrosse**********************************************************************************************************//*********************************************************************************************************** ARM Port** Target : ARM (Includes ARM7, ARM9)* Ported by : Michael Anburaj* URL : http://geocities.com/michaelanburaj/ Email : michaelanburaj@hotmail.com***********************************************************************************************************/#define OS_CPU_GLOBALS#include "includes.h"#define SVCMODE 0x13/*********************************************************************************************************** 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 > 203void 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 > 203void 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.**********************************************************************************************************/#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 >= 251void 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/*********************************************************************************************************** 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. Also that the tasks run in SVC* mode.**********************************************************************************************************/OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, 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)pdata; /* r0 : argument */ *(--stk) = (INT32U)(SVCMODE|0x0); /* PSR */ *(--stk) = (INT32U)(SVCMODE|0x0); /* SPSR */ return (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) && (OS_TASK_SW_HOOK_EN > 0)void OSTaskSwHook (void){}#endif/*********************************************************************************************************** OS_TCBInit() 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 > 203void 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.**********************************************************************************************************/#if (OS_CPU_HOOKS_EN > 0) && (OS_TIME_TICK_HOOK_EN > 0)void OSTimeTickHook (void){}#endifINT32U OSIntCtxSwFlag = 0; /* Used to flag a context switch */ ?? 快捷鍵說明
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