www.pudn.com > test_megbox_vc.rar > OS_CPU.H, change:2006-02-13,size:6391b


/* 
********************************************************************************************************* 
*                                               uC/OS-II 
*                                        The Real-Time Kernel 
* 
*                         (c) Copyright 1992-1999, Jean J. Labrosse, Weston, FL 
*                                          All Rights Reserved 
* 
*                                       80x86/80x88 Specific code 
*                                          LARGE MEMORY MODEL 
* 
*                                          VC++6.0 
* 
* File         : OS_CPU.H 
* By           : Jean J. Labrosse 
  Changed by   : 文佳 Email: ganganwen@163.com 
包括用#define语句定义的、与处理器相关的常数、宏、类型。 
********************************************************************************************************* 
*/ 
 
#ifdef  OS_CPU_GLOBALS 
#define OS_CPU_EXT 
#else 
#define OS_CPU_EXT  extern 
#endif 
 
/* 
********************************************************************************************************* 
*                                              DATA TYPES数据类型 
*                                         (Compiler Specific)与编译器有关 
********************************************************************************************************* 
*/ 
 
typedef unsigned char  BOOLEAN; 
typedef unsigned char  INT8U;                    /* Unsigned  8 bit quantity无符号8位整数                           */ 
typedef signed   char  INT8S;                    /* Signed    8 bit quantity有符号8位整数                           */ 
typedef unsigned int   INT16U;                   /* Unsigned 16 bit quantity无符号16位整数                           */ 
typedef signed   int   INT16S;                   /* Signed   16 bit quantity有符号16位整数                           */ 
typedef unsigned long  INT32U;                   /* Unsigned 32 bit quantity无符号32位整数                           */ 
typedef signed   long  INT32S;                   /* Signed   32 bit quantity有符号32位整数                           */ 
typedef float          FP32;                     /* Single precision floating point单精度浮点数                    */ 
typedef double         FP64;                     /* Double precision floating point双精度浮点数                    */ 
 
typedef unsigned int   OS_STK;                   /* Each stack entry is 32-bit wide堆栈入口宽度              */ //change by wenjia   
typedef unsigned int OS_CPU_SR;                /* Define size of CPU status register (PSW = 32 bits)定义CPU状态寄存器的宽度 */ //change by wenjia   
 
#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 
 
 
/*  
********************************************************************************************************* 
*                              Intel 80x86 (Real-Mode, Large Model) 
* 
* Method #1:  这里采用简单的第一种方法,建立一个全局变量,通过这个全局变量来开关中断 
* 
* 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.  You MUST change the constant in OS_CPU_A.ASM, function  
*             OSIntCtxSw() from 8 to 10. 
* 
* 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. 
********************************************************************************************************* 
*/ 
extern BOOLEAN FlagEn; 
#define  OS_CRITICAL_METHOD    1 
 
#if      OS_CRITICAL_METHOD == 1 
#define  OS_ENTER_CRITICAL()  FlagEn=0                /* 禁止定时器 调度                  */ 
#define  OS_EXIT_CRITICAL()   FlagEn=1				//容许定时器调度                /* Enable  interrupts                        */ 
#endif       //临界段OS_ENTER_CRITICAL()和OS_EXIT_CRITICAL()  2个宏,用来开/关中断 
 
#if      OS_CRITICAL_METHOD == 2 
#define  OS_ENTER_CRITICAL()  _asm {PUSHF; CLI}            /* Disable interrupts                        */ 
#define  OS_EXIT_CRITICAL()   _asm  POPF                   /* Enable  interrupts                        */ 
#endif 
 
#if      OS_CRITICAL_METHOD == 3 
#define  OS_ENTER_CRITICAL()  (cpu_sr = OSCPUSaveSR())    /* Disable interrupts                        */ 
#define  OS_EXIT_CRITICAL()   (OSCPURestoreSR(cpu_sr))    /* Enable  interrupts                        */ 
#endif 
 
/* 
********************************************************************************************************* 
*                           Intel 80x86 (Real-Mode, Large Model) Miscellaneous 
********************************************************************************************************* 
*/ 
 
#define  OS_STK_GROWTH        1      /* Stack grows from HIGH to LOW memory on 80x86定义堆栈的方向:1=向下递减,0=向上递增  */ 
 
 
	 
#define OS_TASK_SW() OSCtxSw()		//保护模式下不能中断 
 
 
/* 
********************************************************************************************************* 
*                                            GLOBAL VARIABLES 
********************************************************************************************************* 
*/ 
 
 
 
/* 
********************************************************************************************************* 
*                                              PROTOTYPES 
********************************************************************************************************* 
*/ 
 
 
 
#if OS_CRITICAL_METHOD == 3                      /* Allocate storage for CPU status register           */ 
OS_CPU_SR  OSCPUSaveSR(void); 
void       OSCPURestoreSR(OS_CPU_SR cpu_sr); 
#endif