os_cpu.h

ucos-IIv2.52在TMS320c6416上的移植

/*********************************************************************
*File:		OS_CPU.H -  V2.52 port for C6416
*Author: 	Jean J. Labrosse 
*Data:		
*modification history:
*	2006.04.20 rongjie revised contents referring to C6416 
*DESCRIPTION:
	little endian, C code in relation to processor.
*********************************************************************/

#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 short INT16U;                   /* Unsigned 16 bit quantity                           */
typedef signed   short INT16S;                   /* Signed   16 bit quantity                           */
typedef unsigned int   INT32U;                   /* Unsigned 32 bit quantity                           */
typedef signed   int   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 in C6711DSP        */

#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    1

#if      OS_CRITICAL_METHOD == 1
extern 	 cregister volatile unsigned int CSR ;
#define  OS_ENTER_CRITICAL()  CSR &= 0xfffe;//asm("	nop 4");	/* Disable interrupts */
#define  OS_EXIT_CRITICAL()   CSR |= 0x0001;//asm("	nop 4");	/* Enable  interrupts */
#endif

#if      OS_CRITICAL_METHOD == 2
#define  OS_ENTER_CRITICAL()  Disable_int()		/* Disable interrupts */
#define  OS_EXIT_CRITICAL()   Restore_int()		/* Enable  interrupts */
#endif

#if      OS_CRITICAL_METHOD == 3
#define  OS_ENTER_CRITICAL()      /* Disable interrupts                        */
#define  OS_EXIT_CRITICAL()       /* Enable  interrupts                        */
#endif

/* function prototypes */

#if      OS_CRITICAL_METHOD == 2
extern void Disable_int(void);	/* function for disable interrupt */
extern void Restore_int(void);	/* function for restore interrupt */
#endif

extern void ctwSave(void);		/* save registers */	
extern void ctwRest(void);		/* restore registers */

/*
*********************************************************************************************************
*               		TI C6416 DSP Miscellaneous
*********************************************************************************************************
*/

#define	OS_STK_GROWTH		1	/* Stack grows from HIGH to LOW memory */

#define	OS_TASK_SW()		OSCtxSw()