📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
* All Rights Reserved
* (c) Copyright ARM Limited 1999. All rights reserved.
*
* ARM Specific code
*
*
* File : OS_CPU_C.C
*********************************************************************************************************
*/
#define OS_CPU_GLOBALS
#include "../../SOURCE/includes.h"
#include "..\..\..\..\uart.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
*
* 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 OSTaskStkit().
* (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.
*********************************************************************************************************
*/
#if OS_TASK_DEL_EN == 1
/* Called should a task ever try returning */
static void SelfDestruct(void)
{
OSTaskDel(OS_PRIO_SELF);
}
#endif
#if OS_STK_GROWTH == 1
/* Full descending stack */
#define STACKTHIS(stk, item) *--stk = (OS_STK) item
#else
/* Empty ascending stack */
#define STACKTHIS(stk, item) *stk++ = (OS_STK) item
#endif
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 = (OS_STK *)ptos; /* Load stack pointer */
/* Stuff a starting context frame onto the stack */
#if OS_TASK_DEL_EN ==1
STACKTHIS(stk, SelfDestruct); /* r14=addr of SelfDestruct routine in case of return */
#else
STACKTHIS(stk, 0); /* r14=Reset machine in case of return */
#endif
STACKTHIS(stk, ptos); /* r13=stack ptr */
STACKTHIS(stk, 0); /* r12=ip */
STACKTHIS(stk, 0); /* r11=fp */
STACKTHIS(stk, ptos); /* r10=sl */
STACKTHIS(stk, 0); /* r9=sb */
STACKTHIS(stk, 0); /* r8 */
STACKTHIS(stk, 0); /* r7 */
STACKTHIS(stk, 0); /* r6 */
STACKTHIS(stk, 0); /* r5 */
STACKTHIS(stk, 0); /* r4 */
STACKTHIS(stk, 0); /* r3 */
STACKTHIS(stk, 0); /* r2 */
STACKTHIS(stk, 0); /* r1 */
STACKTHIS(stk, pdata); /* r0 */
STACKTHIS(stk, task); /* pc */
STACKTHIS(stk, 0x1f); /* spsr=SYS_MODE, interrupts enabled, flags flattened */
return ((OS_STK *)stk);
}
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* 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)
{
//static char i=0;
//put_byte(i++);
}
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments : none
*
* Note(s) : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSInitHookBegin (void)
{
}
#endif
void OSTaskIdleHook()
{
}
void OSTCBInitHook(OS_TCB *ptcb)
{
ptcb=ptcb;
}
/*
*********************************************************************************************************
* OS INITIALIZATION HOOK
* (END)
* INITIALIZE FP SUPPORT
*
* Description: This function is called to initialize the memory partition needed to support context
* switching the Floating-Point registers. This function is called by OSInit() at the end of
* OSInit().
*
* Arguments : none
*
* Returns : none
*
* Note(s) : 1) Tasks that are to use FP support MUST be created with OSTaskCreateExt().
* 2) For the 80486 processor, 108 bytes are required to save the FPU context. I decided to
* allocate 128 bytes (i.e. 32 * INT32U) for future expansion. Also, I used INT32U to
* ensure that storage is located on a 32-bit boundary.
* 3) I decided to 'change' the 'Options' attribute for the statistic task in case you
* use OSTaskStatHook() and need to perform floating-point operations in this function.
* This only applies if OSTaskStat() was created with OSTaskCreateExt().
*********************************************************************************************************
*/
#if OS_VERSION > 203
void OSInitHookEnd (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
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
}
/*
*********************************************************************************************************
* 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)
{
}
#endif
#define BUILD_DATE "Build Date: " __DATE__ "\n"
/*
* Initialize an ARM Target board
*/
void
ARMTargetInit(void)
{
#if 0
/* ---- Tell the world who we are ---------------------------------- */
uHALr_printf("uCOS-II Running on a") ;
#if defined(EBSA285)
uHALr_printf("n EBSA-285 (21285 evaluation board)\n") ;
#elif defined(BRUTUS)
uHALr_printf(" Brutus (SA-1100 verification platform)\n") ;
#elif defined(INTEGRATOR)
uHALr_printf("n Integrator board\n") ;
#elif defined(PROSPECTOR)
uHALr_printf(" Prospector board\n") ;
#elif defined(SAMSUNG)
uHALr_printf(" SAMSUNG KS41100 board\n");
#else
uHALr_printf("n unknown ARM board\n") ;
#endif
uHALr_printf(uHAL_VERSION_STRING);
uHALr_printf("\n") ;
uHALr_printf(BUILD_DATE);
uHALr_printf("\n") ;
#ifdef DEBUG
uHALr_printf("Initialising target board\n");
#endif
/* ---- disable the MMU ------------------------------------- */
uHALr_ResetMMU();
/* ---- disable interrupts (IRQs) --------------------------------- */
ARMDisableInt();
/* ---- soft vectors ---------------------------------------------- */
#ifdef DEBUG
uHALr_printf("Setting up soft vectors\n");
#endif
/* Define pre & post-process routines for Interrupt */
uHALir_DefineIRQ((void *)IrqStart, (void *)IrqFinish, (void *) 0);
uHALr_InitInterrupts();
#ifdef DEBUG
uHALr_printf("Timer init\n");
#endif
uHALr_InitTimers();
#ifdef DEBUG
uHALr_printf("targetInit() complete\n");
#endif
#endif //#if 0
} /* targetInit */
/* start the ARM target running */
void
ARMTargetStart(void)
{
#if 0
#ifdef DEBUG
uHALr_printf("Starting target\n") ;
#endif
/* request the system timer */
if (uHALr_RequestSystemTimer(
(void *) OSTimeTick,
(const unsigned char *)"uCOS-II") <= 0)
uHALr_printf("Timer/IRQ busy\n");
/* Start system timer & enable the interrupt. */
uHALr_InstallSystemTimer();
#endif //#if 0
}
extern void IRQContextSwap(void); /* post DispatchIRQ processing (the _real_ one) */
/* just 'notice' that we need to change context [called in OSIntExit]*/
int need_to_swap_context = 0 ;
/*void OSIntCtxSw(void) {
need_to_swap_context = 1;
}
*/
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