自己动手写CPU.rar

/* ********************************************************************************************************* * uC/OS-II * The Real-Time Kernel * * (c) Copyright 2010, Micrium, Inc., Weston, FL * All Rights Reserved * * MIPS14K * MicroMips * * * File : os_cpu_c.c * Version : v2.90 * By : NB ********************************************************************************************************* */ #define OS_CPU_GLOBALS #include "includes.h" /* ********************************************************************************************************* * HARDWARE INTERRUPT VECTOR ********************************************************************************************************* */ extern char vec[], endvec[]; /* Create the hardware interrupt vector */ asm (".set push\n" ".set nomicromips\n" ".align 2\n" "vec:\n" "\tla $26,InterruptHandler\n" "\tjr $26\n" "endvec:\n" ".set pop\n"); /* ********************************************************************************************************* * EXCEPTION VECTOR ********************************************************************************************************* */ extern char vec2[], endvec2[]; /* Create the exception vector */ asm (".set push\n" ".set nomicromips\n" ".align 2\n" "vec2:\n" "\tla $26,ExceptionHandler\n" "\tjr $26\n" "endvec2:\n" ".set pop\n"); /* ********************************************************************************************************* * 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) { memcpy ((void *) 0x80000200, vec, endvec - vec); /* Install the hardware interrupt vector */ memcpy ((void *) 0x80000180, vec2, endvec2 - vec2); /* Install the exception vector */ mips_clean_cache (0x80000200, 0x80); /* Remove the old vectors from cache. */ } #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 /* ********************************************************************************************************* * TASK CREATION HOOK * * Description: This function is called whenever 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) { } #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 /* ********************************************************************************************************* * TASK RETURN HOOK * * Description: This function is called when a task returns without being properly deleted. * * Arguments : ptcb is a pointer to the task control block of the task that was accidently returned. * * Note(s) : 1) Interrupts are disabled during this call. ********************************************************************************************************* */ #if OS_CPU_HOOKS_EN > 0 void OSTaskReturnHook (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 /* ********************************************************************************************************* * 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 processor-specific. * * Arguments : task is a pointer to the task code. * * p_arg is a pointer to a user supplied data area * * ptos is a pointer to the top of stack. OSTaskStkInit() assumes that 'ptos' points to * a free entry on the 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, * 'ptos' will contain 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 : The location corresponding to the top of the stack * * Note(s) : 1) Interrupts are enabled when each task starts executing. * * 2) An initialized stack has the structure shown below. * * OSTCBHighRdy->OSTCBStkPtr + 0x00 Free Entry