/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*
*                           (c) Copyright 1992-2001, Jean J. Labrosse, Weston, FL
*                                           All Rights Reserved
*
*                                  uC/OS-II Configuration File for V2.51
*
* File : OS_CPU.H
* By   : Jean J. Labrosse
* Ported by : Farid LEZIAR    (fleziar@yahoo.fr)
* version : 2.0
*
*
*    This port is free. you can use it, redistribute it
*    and/or modify it under the following terms:
*
*    1. You are not allowed to remove or modify this copyright notice
*       and License paragraphs, even if parts of the software is used.
*    2. The improvements and/or extentions you make must be available
*       for the community under THIS license, source code included.
*    4. You may NOT distribute this software under another license without
*       explicit permission from farid LEZIAR (fleziar@yahoo.fr).
*    5. This software is free, and distributed in the hope that it will be
*       useful, but WITHOUT ANY WARRANTY.
*    6. Tou have you inform me whenever you use this software.
*
*********************************************************************************************************
*/

#ifdef  OS_CPU_GLOBALS
  #define OS_CPU_EXT
#else
  #define OS_CPU_EXT  extern
#endif

/*
*********************************************************************************************************
*                                              DATA TYPES FOR NIOS 16/32 bits
*                                                  (Compiler Specific)
*********************************************************************************************************
*/

typedef unsigned char  	BOOLEAN;                  /* Unsigned 8 bit                                     */
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 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 long  	OS_STK;                   /* Each stack entry is 32-bit wide                    */
typedef unsigned short  OS_CPU_SR;                /* Define size of CPU status register (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

/*
*********************************************************************************************************
*
*
* 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
  #define  OS_ENTER_CRITICAL()  asm("PFX 8 \n WRCTL %g0;")        /* Disable interrupts                        */
  #define  OS_EXIT_CRITICAL()   asm("PFX 9 \n WRCTL %g0;")        /* Enable  interrupts                        */
#endif

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

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

/*
*********************************************************************************************************
*                           		NIOS 32bits
*********************************************************************************************************
*/

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

#define  OS_TASK_SW()         asm("TRAP 21");         /* Depends on Design : between 16-63 */
                                                      /* 21 is the first parameter of OSNiosInitContextSwitch (see OSNios.h) */

/*
*********************************************************************************************************
*                                            GLOBAL VARIABLES
*********************************************************************************************************
*/



/*
*********************************************************************************************************
*                                              PROTOTYPES
*********************************************************************************************************
*/

INT32U        getStatus();                          /* implemented in OS_CPU_A*.S */
INT32U        getFP();                              /* implemented in OS_CPU_A*.S */
INT32U        getSP();                              /* implemented in OS_CPU_A*.S */
INT32U        getReg();                             /* implemented in OS_CPU_A*.S */
OS_CPU_SR     getITStatus();                        /* implemented in OS_CPU_A*.S */
void          setITStatus(OS_CPU_SR status);        /* implemented in OS_CPU_A*.S */
INT16U        getHILIMIT();                         /* implemented in OS_CPU_A*.S */
INT16U        getIPRI();                            /* implemented in OS_CPU_A*.S */