/*
*********************************************************************************************************
*                                              uC/OS-II
*                                        The Real-Time Kernel
*
*                    Copyright 1992-2020 Silicon Laboratories Inc. www.silabs.com
*
*                                 SPDX-License-Identifier: APACHE-2.0
*
*               This software is subject to an open source license and is distributed by
*                Silicon Laboratories Inc. pursuant to the terms of the Apache License,
*                    Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
*
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*
*                                          LATTICEMICO32 Port
*
* Filename  : os_cpu.h
* Version   : V2.93.00
*********************************************************************************************************
* For       : LatticeMico32
* Toolchain : GNU C/C++ Compiler
*********************************************************************************************************
*/

#ifndef  OS_CPU_H
#define  OS_CPU_H

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

/*
*********************************************************************************************************
*                                              DATA TYPES
*                                         (Compiler Specific)
*********************************************************************************************************
*/

typedef unsigned  int            BOOLEAN;       /* BOOLEAN   unsigned char                             */
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;
typedef double                   FP64;

typedef unsigned  int            OS_STK;        /* Each stack entry is 32-bits wide                    */
typedef unsigned  int  volatile  OS_CPU_SR;     /* The CPU Status Word is 32-bits wide.                */

/*
*********************************************************************************************************
*                                    CRITICAL SECTIONS MANAGEMENT
*
* 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 = OS_CPU_SR_Save();}
#define  OS_EXIT_CRITICAL()    {OS_CPU_SR_Restore(cpu_sr);}

#endif

/*
*********************************************************************************************************
*                                            MISCELLANEOUS
*********************************************************************************************************
*/

#define  OS_STK_GROWTH        1                 /* Stack grows from HIGH to LOW memory                 */
#define  OS_TASK_SW()         OSCtxSw()         /* See OS_CPU_A.S                                      */

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

void       OSCtxSw(void);
void       OSIntCtxSw(void);
void       OSStartHighRdy(void);

OS_CPU_SR  OS_CPU_SR_Save(void);                /* See OS_CPU_A.S                                      */
void       OS_CPU_SR_Restore(OS_CPU_SR);        /* See OS_CPU_A.S                                      */

#endif
