os_cpu.h

ucos的源代码程序

/*////////////////////////////////////////
//2008-4-1
//Philip
*/////////////////////////////////////////

#ifndef __OS_CPU_H__
#define __OS_CPU_H__
///////////////////////////


#ifdef  OS_CPU_GLOBALS  
#define OS_CPU_EXT
#else
#define OS_CPU_EXT  extern    //export the defintion
#endif

////////////////////////////
//theae types are depedent on the ARM process

typedef unsigned char  BOOLEAN ;    // U -- Unsigned  S -- Signed
typedef unsigned char  INT8U;       //
typedef signed   char  INT8S;       //      
typedef unsigned int   INT16U;      //        
typedef signed   int   INT16S;      //        
typedef unsigned long  INT32U;      //          
typedef signed   long  INT32S; 	    //

////////////////////////////
typedef unsigned int   OS_STK;      // Each stack entry is 16-bit wide 
typedef unsigned int   OS_CPU_SR;   // The cpu stauts register , In arm it is 32 bit

#define OS_STK_GROWTH  1            // If 1 ,the task stack grows from high to low ,0 is low to high

////////////////////////////////////////////////////////
//Disable interrupt or enable interrupt 
extern int  INTS_OFF(void);
extern void INTS_ON(void);

#define  OS_ENTER_CRITICAL()  { cpu_sr = INTS_OFF(); }
#define  OS_EXIT_CRITICAL()   { if(cpu_sr == 0) INTS_ON(); }

//////////////////////////////////////////////////////////
#endif /*__OS_CPU_H__*/