os_cpu.h

讲UC/OS的书

/*
*********************************************************************************************************
*                                               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.H
*********************************************************************************************************
*/
#include <hidef.h>       /* common defines and macros */
#include <MC9S12GC128.h> /* cpu register */ 

#ifdef  OS_CPU_GLOBALS
#define OS_CPU_EXT
#else
#define OS_CPU_EXT  extern
#endif

/*
*********************************************************************************************************
*                                              DATA TYPES
*                                         (Compiler Specific)
*********************************************************************************************************
*/

typedef unsigned char  BOOLEAN;
typedef unsigned char  INT8U;                    /* Unsigned  8 bit quantity                           */
typedef signed   char  INT8S;                    /* Signed    8 bit quantity                           */
typedef unsigned int   INT16U;                   /* Unsigned 16 bit quantity                           */
typedef signed   int   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 char  OS_STK;                   /* Each stack entry is 16-bit wide                    */

#define BYTE           INT8S                     /* Define data types for backward compatibility ...   */
#define UBYTE          INT8U                     /* ... to uC/OS V1.xx.  Not actually needed for ...   */
#define WORD           INT16S                    /* ... uC/OS-II.                                      */
#define UWORD          INT16U
#define LONG           INT32S
#define ULONG          INT32U

/* 
*********************************************************************************************************
*                              ARM, various architectures
*
*********************************************************************************************************
*/
#define OS_TASK_SW()            OSCtxSw()
#define	OS_ENTER_CRITICAL()			DisableInterrupts
#define	OS_EXIT_CRITICAL()      EnableInterrupts

/*
 * Definitions specific to Freescale 9S12
 */
/* stack stuff 堆栈增长方向*/
#define OS_STK_GROWTH    1

typedef struct{
   OS_STK *Sys_stack_ptr; 
}SYS_Stk;
extern SYS_Stk *Sys_sp;

#define OS_SAVE_SP() if(OSIntNesting==1){asm ldx OSTCBCur;asm sts 0,x;asm ldx Sys_sp;asm lds 0,x;}//保存第一层被中断打断任务的堆栈现场 切换到系统堆栈