/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
* (c) Copyright 1992-2002, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
* 80x86/80x88 Specific code
* LARGE MEMORY MODEL
*
* Borland C/C++ V4.51
*
* File : OS_CPU.H
* By : Jean J. Labrosse
*********************************************************************************************************
*/
#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 16-bit wide */
typedef unsigned short OS_CPU_SR; /* Define size of CPU status register (PSW = 16 bits) */
#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: 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 2
#if OS_CRITICAL_METHOD == 1
#define OS_ENTER_CRITICAL() asm CLI /* Disable interrupts */
#define OS_EXIT_CRITICAL() asm STI /* 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 uCOS 0x80 /* Interrupt vector # used for context switch */
#define OS_TASK_SW() asm INT uCOS
/*
*********************************************************************************************************
* GLOBAL VARIABLES
*********************************************************************************************************
*/
OS_CPU_EXT INT8U OSTickDOSCtr; /* Counter used to invoke DOS's tick handler every 'n' ticks */
/*
*********************************************************************************************************
* PROTOTYPES
*********************************************************************************************************
*/
void OSTaskStkInit_FPE_x86(OS_STK **pptos, OS_STK **ppbos, INT32U *psize);
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR OSCPUSaveSR(void);
void OSCPURestoreSR(OS_CPU_SR cpu_sr);
#endif
