📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 2002, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
* Revised by Jorgen Andersson for
* uBlaze Specific code
* (Xilinx C V2.2)
*
*
* File : OS_CPU_C.C
* By : Jean J. Labrosse
* Revised : Jorgen Andersson, Nohau Corporation (10/30/02)
* Port Version : V2.00 (for uC/OS-II V2.51 and higher)
*********************************************************************************************************
*/
#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) : 1) XIRQ interrupts are disabled when your task starts executing. You can change this by
* clearing BIT6 in the CCR.
* 2) The STOP instruction is disabled when your task starts executing. You can change this
* by clearing BIT7 in the CCR.
* 3) The other interrupts (i.e. maskable interrupts) are enabled when your task starts
* executing. You can change this by setting BIT4 in the CCR.
* 4) You can change pass the above options in the 'opt' argument. You MUST only use the
* upper 8 bits of 'opt' because the lower bits are reserved by uC/OS-II. If you make
* changes to the code below, you will need to ensure that it doesn't affect the behaviour
* of OSTaskIdle() and OSTaskStat().
* 5) Registers are initialized to make them easy to differentiate with a debugger.
*********************************************************************************************************
*/
extern void* _SDA_BASE_;
extern void* _SDA2_BASE_;
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
INT32U *dwstk;
opt = opt; /* 'opt' is not used, prevent warning */
dwstk = (INT32U *)ptos; /* Load stack pointer */
*--dwstk = (INT32U)pdata; /* Simulate call to function with argument not used for uBlaze */
*--dwstk = (INT32U)task; /* ??? remove not used for uBlaze? */
*--dwstk = (INT32U)task+1; /* Put pointer to task on top of stack */
*--dwstk = (INT32U)0x0000; /* R0 Register */
*--dwstk = (INT32U)0x1111; /* R1 Register */
*--dwstk = (INT32U)&_SDA2_BASE_; /* R2 Register */
*--dwstk = (INT32U)0x3333; /* R3 Register */
*--dwstk = (INT32U)0x4444; /* R4 Register */
*--dwstk = (INT32U)0x5555; /* R5 Register */
*--dwstk = (INT32U)0x6666; /* R6 Register */
*--dwstk = (INT32U)0x7777; /* R7 Register */
*--dwstk = (INT32U)0x8888; /* R8 Register */
*--dwstk = (INT32U)0x9999; /* R9 Register */
*--dwstk = (INT32U)0x0000; /* R10 Register */
*--dwstk = (INT32U)0x1111; /* R11 Register */
*--dwstk = (INT32U)0x2222; /* R12 Register */
*--dwstk = (INT32U)&_SDA_BASE_; /* R13 Register */
*--dwstk = (INT32U)0x4444; /* R14 Register */
*--dwstk = (INT32U)0x5555; /* R15 Register */
*--dwstk = (INT32U)0x6666; /* R16 Register */
*--dwstk = (INT32U)0x7777; /* R17 Register */
*--dwstk = (INT32U)0x8888; /* R18 Register */
*--dwstk = (INT32U)0x9999; /* R19 Register */
*--dwstk = (INT32U)0x0000; /* R20 Register */
*--dwstk = (INT32U)0x1111; /* R21 Register */
*--dwstk = (INT32U)0x2222; /* R22 Register */
*--dwstk = (INT32U)0x3333; /* R23 Register */
*--dwstk = (INT32U)0x4444; /* R24 Register */
*--dwstk = (INT32U)0x5555; /* R25 Register */
*--dwstk = (INT32U)0x6666; /* R26 Register */
*--dwstk = (INT32U)0x7777; /* R27 Register */
*--dwstk = (INT32U)0x8888; /* R28 Register */
*--dwstk = (INT32U)0x9999; /* R29 Register */
*--dwstk = (INT32U)0x0000; /* R30 Register */
*--dwstk = (INT32U)0x1111; /* R31 Register */
*--dwstk = (INT32U)0x0000; /* MSR Register */
return ((OS_STK *)dwstk); /* Return pointer to new top-of-stack */
}
/*$PAGE*/
/*
*********************************************************************************************************
* 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)
{
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
void OSTimeTickHook (void)
{
}
#endif
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