📄 os_cpu_c.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1999, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
*
* 683xx Specific code
* SDS C V7.4
*
* File : OS_CPU_C.C
* By : Jean J. Labrosse
*********************************************************************************************************
*/
#ifndef OS_MASTER_FILE
#include "includes.h"
#endif
/*
*********************************************************************************************************
* REVISION HISTORY
*
* $Log: J:/software/ucos-ii/m683xx/sds/source/vc/os_cpu_c.c_v $
*
* Rev 1.4 01 May 1999 11:51:40 JJL
* ***************************** M683xx REL V1.05 ******************************
* - Added check of OSIntNesting in OSIntExit68K() (see OS_CPU_A.S).
*
* Rev 1.3 29 Jun 1999 22:04:02 JJL
* ***************************** M683xx REL V1.04 ******************************
* - Added function OSIntExit68K() (see OS_CPU_A.S) which must now be JUMPed to
* at the end of ALL ISRs. Your ISR code MUST now look as follows:
*
* _YourISR:
* ADDQ.B #1,_OSIntNesting ; OSIntNesting++
* MOVEM.L A0-A6/D0-D7,-(A7) ; Save ALL registers
* ; CLEAR the INTERRUPT source!
* JSR _YourISRHandler
* JMP _OSIntExit68K ; Exit through uC/OS-II at end of ISR
*
* As you can see, you MUST increment OSIntNesting at the beginning of the ISR
* and NOT call OSIntExit(). OSIntExit68K() knows to return to task level code
* because it examines the stack frame for the contents of the Status register
* (SR) that is pushed onto the stack when the CPU recognizes an interrupt.
*
* Rev 1.2 09 May 1999 11:13:30 JJL
* ***************************** M683xx REL V1.03 ******************************
* - The stack adjustment constant in OSIntCtxSw() was set incorrectly. The
* correct value needed to be 10 instead of 18 because the SDS compiler
* doesn't allocate local variables for OSIntExit().
*
* - The function OSSetVect() in OS_CPU_C.C didn't properly cast 'addr'. The
* correct statement is:
* *pvect = (INT32U)addr;
* instead of:
* *pvect = (INT32U *)addr;
*
* Rev 1.0 07 Feb 1999 21:25:32 JJL
* ***************************** M683xx REL V1.02 ******************************
* - Initial release of the SDS port for uC/OS-II. The revision number matches
* that of other M683xx or M680x0 ports.
*********************************************************************************************************
*/
/*$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) The initial value of the Status Register (SR) is OS_INITIAL_SR sets the 683xx processor
* to run in SUPERVISOR mode. It is assumed that all uC/OS-II tasks run in supervisor
* mode.
* 2) You can 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().
* 3) Registers are initialized to make them easy to differentiate with a debugger.
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
INT32U *pstk32;
INT16U *pstk16;
opt = opt; /* 'opt' is not used, prevent warning */
/* Load stack pointer and align on 32-bit bound */
pstk32 = (INT32U *)((INT32U)ptos & 0xFFFFFFFCL);
/* -- SIMULATE CALL TO FUNCTION WITH ARGUMENT -- */
*--pstk32 = (INT32U)pdata; /* pdata */
*--pstk32 = (INT32U)task; /* Task return address */
pstk16 = (INT16U *)pstk32; /* Switch to 16-bit wide stack */
/* ------ SIMULATE INTERRUPT STACK FRAME ------- */
*--pstk16 = (INT16U)(0x0080 + 4 * OS_TRAP_NBR); /* Format/Vector */
pstk32 = (INT32U *)pstk16; /* Switch to 32-bit wide stack */
*--pstk32 = (INT32U)task; /* Task return address */
pstk16 = (INT16U *)pstk32; /* Switch to 16-bit wide stack */
*--pstk16 = (INT16U)OS_INITIAL_SR; /* Initial Status Register value for the task */
pstk32 = (INT32U *)pstk16; /* Switch to 32-bit wide stack */
/* ------- SAVE ALL PROCESSOR REGISTERS -------- */
*--pstk32 = (INT32U)0x0000A6A6L; /* Register A6 */
*--pstk32 = (INT32U)0x0000A5A5L; /* Register A5 */
*--pstk32 = (INT32U)0x0000A4A4L; /* Register A4 */
*--pstk32 = (INT32U)0x0000A3A3L; /* Register A3 */
*--pstk32 = (INT32U)0x0000A2A2L; /* Register A2 */
*--pstk32 = (INT32U)0x0000A1A1L; /* Register A1 */
*--pstk32 = (INT32U)0x0000A0A0L; /* Register A0 */
*--pstk32 = (INT32U)0x0000D7D7L; /* Register D7 */
*--pstk32 = (INT32U)0x0000D6D6L; /* Register D6 */
*--pstk32 = (INT32U)0x0000D5D5L; /* Register D5 */
*--pstk32 = (INT32U)0x0000D4D4L; /* Register D4 */
*--pstk32 = (INT32U)0x0000D3D3L; /* Register D3 */
*--pstk32 = (INT32U)0x0000D2D2L; /* Register D2 */
*--pstk32 = (INT32U)0x0000D1D1L; /* Register D1 */
*--pstk32 = (INT32U)0x0000D0D0L; /* Register D0 */
return ((OS_STK *)pstk32); /* Return pointer to new top-of-stack */
}
/*$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)
{
}
/*
*********************************************************************************************************
* 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
/*$PAGE*/
/*
*********************************************************************************************************
* GET ISR VECTOR
*
* Description: This function is called to get the address of the exception handler specified by 'vect'.
* It is assumed that the VBR (Vector Base Register) is set to 0x00000000.
*
* Arguments : vect is the vector number
*
* Note(s) : 1) Interrupts are disabled during this call
* 2) It is assumed that the VBR (Vector Base Register) is set to 0x00000000.
*********************************************************************************************************
*/
void *OSVectGet (INT8U vect)
{
void *addr;
OS_ENTER_CRITICAL();
addr = (void *)(*(INT32U *)((INT16U)vect * 4));
OS_EXIT_CRITICAL();
return (addr);
}
/*
*********************************************************************************************************
* SET ISR VECTOR
*
* Description: This function is called to set the contents of an exception vector. The function assumes
* that the VBR (Vector Base Register) is set to 0x00000000.
*
* Arguments : vect is the vector number
* addr is the address of the ISR handler
*
* Note(s) : 1) Interrupts are disabled during this call
*********************************************************************************************************
*/
void OSVectSet (INT8U vect, void (*addr)(void))
{
INT32U *pvect;
pvect = (INT32U *)((INT16U)vect * 4);
OS_ENTER_CRITICAL();
*pvect = (INT32U)addr;
OS_EXIT_CRITICAL();
}
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