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/*

----------------------------------------------------------------------

    CHiPES Embedded RTR Systems Copyright (c) Tim Oliver 2002-2004

----------------------------------------------------------------------

 File   : os_cpu.h

 Author : Tim Oliver

 Email  : timtimoliver@yahoo.co.uk

---------------------------[Description]------------------------------

                Part of the OpenRISC Reference Platform Port of MicroC/OS-II

-------------------------[CVS Information]----------------------------

  $Id: os_cpu.h,v 1.1 2004/07/22 06:36:58 p014082819 Exp $

  $Revision: 1.1 $

----------------------------------------------------------------------

*/

/*

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef OS_CPU_H

#define OS_CPU_H

#ifdef  OS_CPU_GLOBALS

#define OS_CPU_EXT

#else

#define OS_CPU_EXT  extern

#endif

/* Register access macros */

#define REG8(add) *((volatile unsigned char *)(add))

#define REG16(add) *((volatile unsigned short *)(add))

#define REG32(add) *((volatile unsigned long *)(add))

/*$PAGE*/

/*

*********************************************************************************************************

*                                              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 unsigned long   OS_STK;                   /* Each stack entry is 32-bits wide                  */

typedef unsigned long volatile   OS_CPU_SR;       /* The CPU Status Word is 32-bits wide               */

                                                  /* This variable MUST be volatile for proper */

                                                  /* operation. Refer to os_cpu_a.s for more */

                                                  /* details. */

/*

*********************************************************************************************************

*                              OpenCores OpenRISC

*

* 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    3

#if      OS_CRITICAL_METHOD == 3

#define  OS_ENTER_CRITICAL() cpu_sr = OSDisableInterrupts();

#define  OS_EXIT_CRITICAL()  OSEnableInterrupts(cpu_sr);

#endif

/*

*********************************************************************************************************

*                           OpenCores OpenRISC

*********************************************************************************************************

*/

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

#define  OS_TASK_SW() __asm__ ("l.sys 0");\

                      __asm__ ("l.nop");

/*

*********************************************************************************************************

*                                            GLOBAL VARIABLES

*********************************************************************************************************

*/

/*

*********************************************************************************************************

*                                          FUNCTION PROTOTYPES

*********************************************************************************************************

*/

#if      OS_CRITICAL_METHOD == 3

OS_CPU_SR OSDisableInterrupts(void);

void OSEnableInterrupts(OS_CPU_SR cpu_sr);

#endif

/*

#ifdef  DEBUG

#define debug(fmt,args...) printf (fmt ,##args)

#else

#define debug(fmt,args...) __printf (fmt ,##args)

#endif

*/

extern void mtspr(unsigned long spr, unsigned long value);      /* For writing into SPR. */

extern unsigned long mfspr(unsigned long spr);                  /* For reading SPR. */

extern void report(unsigned long value);                        /* Prints out a value */

extern void exit (int i) __attribute__ ((__noreturn__));        /* return value by making a syscall */

//extern void __printf (const char *fmt, ...);                    /* simulator stdout */

extern void OSInitTick (void);                                  /* init ticker */

void main (void); /* Function to be called at entry point - not defined here.  */

/* stdio */

extern int getc (void);

extern int testc (void);

extern int ctrlc (void);

extern void putc (const char c);

#endif