📄 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
*
*
* NIOS 32bits implementation
*
*
*
* File : OS_CPU_C.C
* By : Jean J. Labrosse
* Ported by : Farid LEZIAR (fleziar@yahoo.fr)
* : version 2.0
*
* This port is free. you can use it, redistribute it
* and/or modify it under the following terms:
*
* 1. You are not allowed to remove or modify this copyright notice
* and License paragraphs, even if parts of the software is used.
* 2. The improvements and/or extentions you make must be available
* for the community under THIS license, source code included.
* 4. You may NOT distribute this software under another license without
* explicit permission from farid LEZIAR (fleziar@yahoo.fr).
* 5. This software is free, and distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY.
* 6. Tou have you inform me whenever you use this software.
*
*********************************************************************************************************
*/
#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 */
#if NIOS_OSVIEW == 1
OSView_TaskCreateHook(ptcb);
#endif
}
#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)
{
OS_STK *stk;
opt = opt; /* 'opt' is not used, prevent warning */
stk = ptos; /* Load stack pointer*/
stk--; /* Let the top unused */
*stk-- = (OS_STK)(task); /* %o7 ( Interrupt Return Address ) */
*stk-- = (1<<15) | (63<<9) | (getHILIMIT()<<4); /* ISTATUS (IE=1, IPRI=63, CWP = HI_LIMIT, CC = 0); */
*stk-- = 7; /* %g7 */
*stk-- = 6; /* %g6 */
*stk-- = 5; /* %g5 */
*stk-- = 4; /* %g4 */
*stk-- = 3; /* %g3 */
*stk-- = 2; /* %g2 */
*stk-- = 1; /* %g1 */
*stk-- = 0; /* %g0 */
/* Task window (cwp = HI_LIMIT) */
*stk-- = 0x37; /* %o7 */
*stk-- = 0x36; /* %o6 ( %sp register ) overwritten in asm */
*stk-- = 0x35; /* %o5 */
*stk-- = 0x34; /* %o4 */
*stk-- = 0x33; /* %o3 */
*stk-- = 0x32; /* %o2 */
*stk-- = 0x31; /* %o1 */
*stk-- = (OS_STK)(pdata); /* %o0 ( arg0 for parameters passing from Asm to C : with save instruction ) */
*stk-- = 0x27; /* %L7 */
*stk-- = 0x26; /* %L6 */
*stk-- = 0x25; /* %L5 */
*stk-- = 0x24; /* %L4 */
*stk-- = 0x23; /* %L3 */
*stk-- = 0x22; /* %L2 */
*stk-- = 0x21; /* %L1 */
*stk-- = 0x20; /* %L0 */
*stk-- = 0x17; /* %i7 */
*stk-- = 0x16; /* %i6 */
*stk-- = 0x15; /* %i5 */
*stk-- = 0x14; /* %i4 */
*stk-- = 0x13; /* %i3 */
*stk-- = 0x12; /* %i2 */
*stk-- = 0x11; /* %i1 */
*stk-- = 0x10; /* %i0 */
*stk-- = (0<<15) | (63<<9) | ((getHILIMIT()-1)<<4); /* STATUS(ISR) */
stk -= 23; /* Compiler space */
/* stk points to a unused entry */
return ((OS_STK *)stk);
}
/*$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)
{
#if NIOS_OSVIEW == 1
OSView_TaskSwHook();
#endif
}
#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_TIME_TICK_HOOK_EN > 0
void OSTimeTickHook (void)
{
#if NIOS_OSVIEW == 1
OSView_TickHook();
#endif
}
#endif
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