📄 os_cpu_c.c
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//**************adamdcg 2008-4-12
#define OS_CPU_GLOBALS
#include "includes.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 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)
{
INT32U *stk;//Q:C33209中SP是32位 必须保证OS_STK 也是32bit
opt = opt; /* 'opt' is not used, prevent warning */
stk = (INT32U *)ptos; /* Load stack pointer */
*--stk =(INT32U *)pdata; /* Simulate call to function with argument */
*--stk =(INT32U *) task;
//中断时 入栈顺序 PSW--PC
*--stk = 0x00000010; /* PSW = Interrupts enabled */
/*from r15 to r0 into stack */
*--stk =0xFFFFFFFF; /*r15=0xFFFFFFFFF*/
*--stk =0xEEEEEEEE; /*r14=0xEEEEEEEE*/
*--stk =0xDDDDDDDD; /*r13=0xDDDDDDD*/
*--stk =0xCCCCCCCC; /*r12=0xCCCCCCC*/
*--stk =0xBBBBBBBB; /*r11=0xBBBBBBBB*/
*--stk =0xAAAAAAAA; /*r10=0xAAAAAAAA*/
*--stk =0x99999999; /*r9=0x99999999*/
*--stk =0x88888888; /*r8=0x88888888*/
*--stk =0x77777777; /*r7=0x77777777*/
*--stk =0x66666666; /*r6=0x66666666*/
*--stk =0x55555555; /*r5=0x55555555*/
*--stk =0x44444444; /*r4=0x44444444*/
*--stk =0x33333333; /*r3=0x33333333*/
*--stk =0x22222222; /*r2=0x22222222*/
*--stk =0x11111111; /*r1=0x11111111*/
*--stk =0x00000000; /*r0=0x00000000*/
return ((OS_STK *)stk);/*Adamdcg adding*/
}
void OSStartHighRdy(void)//Adamdcg 08-04-12
{
OSTaskSwHook();
OSRunning=TRUE;
//SP=OSTCBHighRdy->OSTCBStkPtr
asm("xld.w %r0,[OSTCBHighRdy]");//load absolute address of OSTCBHighRdy
asm("ld.w %r1,[%r0]");
asm("ld.w %sp,%r1");
asm("popn %r15");//from r0 to r15 outoff stack
asm("reti");// 出栈顺序 PC -- PSW
}
void OSCtxSw (void)//Adamdcg 08-04-12
{
//PSW into stack
//PC into stack
asm("pushn %r15");//from r15 to r0 into stack
//OSTCBCur->OSTCBStkPtr=SP
asm("xld.w %r0,[OSTCBCur]");//load absolute address of OSTCBCur
asm("ld.w %r1,%sp");
asm("ld.w [%r0],%r1");
OSTaskSwHook();
OSTCBCur=OSTCBHighRdy;
OSPrioCur=OSPrioHighRdy;
//SP=OSTCBHighRdy->OSTCBStkPtr
asm("xld.w %r0,[OSTCBHighRdy]");//load absolute address of OSTCBHighRdy
asm("ld.w %r1,[%r0]");
asm("ld.w %sp,%r1");
asm("popn %r15");//from r0 to r15 outoff stack
asm("reti");// PSW PC
}
void OSIntCtxSw(void)//Adamdcg 2008-4-12
{
OSTaskSwHook();
OSTCBCur=OSTCBHighRdy;
OSPrioCur=OSPrioHighRdy;
//SP=OSTCBHighRdy->OSTCBStkPtr
asm("xld.w %r0,[OSTCBHighRdy]");//load absolute address of OSTCBHighRdy
asm("ld.w %r1,[%r0]");
asm("ld.w %sp,%r1");
asm("popn %r15");//from r0 to r15 outoff stack
asm("reti");// PSW PC
}
void OSCPUSaveSR(void)//Adamdcg
{
/*asm("pushn %r1");
asm("ld.w %r1,%psr"); // IE,disable interrupt 关中断嵌套
asm("and %r1,0b01111");
asm("ld.w %psr,%r1");
asm("popn %r1");*/
}
void OSCPURestoreSR(void)//Adamdcg
{
/*asm("pushn %r1");
asm("ld.w %r1,%psr"); // IE,enable interrupt
asm("or %r1,0x10");
asm("ld.w %psr,%r1");
asm("popn %r1");*/
}
/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
* 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_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_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif
/*
*********************************************************************************************************
* 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)
{
}
/*
*********************************************************************************************************
* OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() 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_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.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
}
/*
*********************************************************************************************************
* 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_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#endif
#endif
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