www.pudn.com > ucos_vc0.1.rar > OS_CPU.H
/*
*********************************************************************************************************
* 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
*********************************************************************************************************
*/
//#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 int OS_STK; /* Each stack entry is 32-bit wide */ //change by wenjia
typedef unsigned int OS_CPU_SR; /* Define size of CPU status register (PSW = 32 bits) */ //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
#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 */
#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