os_cpu.h

ucos-ii 的完整代码

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                        The Real-Time Kernel
*
*                              (c) Copyright 2006, Micrium, Inc, Weston, FL
*                                          All Rights Reserved
*
*                                         Coldfile Specific code
*
* File  : OS_CPU.H
* By    : Jean J. Labrosse
*********************************************************************************************************
*/

#ifndef OS_CPU_H
#define OS_CPU_H

/*
*********************************************************************************************************
*                                              DATA TYPES
*********************************************************************************************************
*/

typedef unsigned  char  BOOLEAN;
typedef unsigned  char  INT8U;              /* Unsigned  8 bit quantity                                */
typedef signed    char  INT8S;              /* Signed    8 bit quantity                                */
typedef unsigned  short INT16U;             /* Unsigned 16 bit quantity                                */
typedef signed    short INT16S;             /* Signed   16 bit quantity                                */
typedef unsigned  long  INT32U;             /* Unsigned 32 bit quantity                                */
typedef signed    long  INT32S;             /* Signed   32 bit quantity                                */
typedef float           FP32;               /* Single precision floating point                         */
typedef double          FP64;               /* Double precision floating point                         */


typedef unsigned  long  OS_STK;             /* Each stack entry is 32-bit wide                         */
typedef unsigned  short OS_CPU_SR;          /* Define size of CPU status register, 16 bits on ColdFire */

/*
*********************************************************************************************************
*                                              CONSTANTS
*********************************************************************************************************
*/

#ifndef  FALSE
#define  FALSE    0
#endif

#ifndef  TRUE
#define  TRUE     1
#endif

/* 
*********************************************************************************************************
*                             Motorola ColdFire MCF5275 Inline Assembly
*
* Method #1:  Disable/Enable interrupts using simple instructions.  After critical section, interrupts
*             will be enabled even if they were disabled before entering the critical section.
*
* Method #2:  Disable/Enable interrupts by preserving the state of interrupts.  In other words, if 
*             interrupts were disabled before entering the critical section, they will be disabled when
*             leaving the critical section.
*
* Method #3:  Disable/Enable interrupts by preserving the state of interrupts.  Generally speaking you
*             would store the state of the interrupt disable flag in the local variable 'cpu_sr' and then
*             disable interrupts.  'cpu_sr' is allocated in all of uC/OS-II's functions that need to 
*             disable interrupts.  You would restore the interrupt disable state by copying back 'cpu_sr'
*             into the CPU's status register.
*********************************************************************************************************
*/

#define  OS_CRITICAL_METHOD    3
                                            

#if      OS_CRITICAL_METHOD == 3
#define  OS_ENTER_CRITICAL()  (cpu_sr = OS_CPU_SR_Save())	 /* Disable interrupts                     */

#define  OS_EXIT_CRITICAL()   (OS_CPU_SR_Restore(cpu_sr))    /* Enable  interrupts                     */

#endif
                                                       
#define  OS_TASK_SW()          asm(TRAP #14;)   /* Use Trap #14 to perform a Task Level Context Switch */
                          
#define  OS_STK_GROWTH         1                /* Define stack growth: 1 = Down, 0 = Up               */

/* 
*********************************************************************************************************
*                                          ColdFire Specifics
*********************************************************************************************************
*/

#define  OS_INITIAL_SR        0x2000            /* Supervisor mode, interrupts enabled                 */

#define  OS_TRAP_NBR              14            /* OSCtxSw() invoked through TRAP #14                  */

/*
*********************************************************************************************************
*                                              PROTOTYPES
*********************************************************************************************************
*/

#if OS_CRITICAL_METHOD == 3
OS_CPU_SR  OS_CPU_SR_Save(void);
void       OS_CPU_SR_Restore(OS_CPU_SR cpu_sr);
#endif

void 	   OSStartHighRdy(void); 
void 	   OSIntCtxSw(void); 
void 	   OSCtxSw(void);
void       OSInitVBR(void);

#endif