Ix86L.rar_os_cpu.h

/* ********************************************************************************************************* * uC/OS-II * The Real-Time Kernel * * (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL * All Rights Reserved * * * 80x86/80x88 Specific code * LARGE MEMORY MODEL * * Borland C/C++ V4.51 * * File : OS_CPU_C.C * By : Jean J. Labrosse ********************************************************************************************************* */ #define OS_CPU_GLOBALS #include "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) { INT16U *stk; opt = opt; /* 'opt' is not used, prevent warning */ stk = (INT16U *)ptos; /* Load stack pointer */ *stk-- = (INT16U)FP_SEG(pdata); /* Simulate call to function with argument */ *stk-- = (INT16U)FP_OFF(pdata); *stk-- = (INT16U)FP_SEG(task); *stk-- = (INT16U)FP_OFF(task); *stk-- = (INT16U)0x0202; /* SW = Interrupts enabled */ *stk-- = (INT16U)FP_SEG(task); /* Put pointer to task on top of stack */ *stk-- = (INT16U)FP_OFF(task); *stk-- = (INT16U)0xAAAA; /* AX = 0xAAAA */ *stk-- = (INT16U)0xCCCC; /* CX = 0xCCCC */ *stk-- = (INT16U)0xDDDD; /* DX = 0xDDDD */ *stk-- = (INT16U)0xBBBB; /* BX = 0xBBBB */ *stk-- = (INT16U)0x0000; /* SP = 0x0000