embARC: add support

Signed-off-by: Yuguo Zou <[email protected]>

Author: YuguoWH

Ports/ARC/embARC/MetaWare/os_cpu.h

@@ -0,0 +1,109 @@
+/*
+*********************************************************************************************************
+*                                                uC/OS-III
+*                                          The Real-Time Kernel
+*
+*                         (c) Copyright 2009-2018; Silicon Laboratories Inc.,
+*                                400 W. Cesar Chavez, Austin, TX 78701
+*
+*                   All rights reserved. Protected by international copyright laws.
+*
+*                  Your use of this software is subject to your acceptance of the terms
+*                  of a Silicon Labs Micrium software license, which can be obtained by
+*                  contacting [email protected]. If you do not agree to the terms of this
+*                  license, you may not use this software.
+*
+*                  Please help us continue to provide the Embedded community with the finest
+*                  software available. Your honesty is greatly appreciated.
+*
+*                    You can find our product's documentation at: doc.micrium.com
+*
+*                          For more information visit us at: www.micrium.com
+*********************************************************************************************************
+*/
+
+/*
+*********************************************************************************************************
+*
+*                                         ARC
+*                                         MetaWare
+*
+* Filename     : os_cpu.h
+* Version      : V3.07.03
+*********************************************************************************************************
+*/
+
+#ifndef _OS_CPU_H
+#define _OS_CPU_H
+
+#ifdef  OS_CPU_GLOBALS
+#define OS_CPU_EXT
+#else
+#define OS_CPU_EXT  extern
+#endif
+
+#include "embARC.h"
+#ifdef __cplusplus
+extern  "C" {
+#endif
+
+/*
+*********************************************************************************************************
+*                                               MACROS
+*
+* Note(s): OS_TASK_SW()  invokes the task level context switch.
+*
+*          (1) On some processors, this corresponds to a call to OSCtxSw() which is an assemply language
+*              function that performs the context switch.
+*
+*          (2) On some processors, you need to simulate an interrupt using a 'sowfate interrupt' or a
+*              TRAP instruction.  Some compilers allow you to add in-line assembly language as shown.
+*********************************************************************************************************
+*/
+
+#define  OS_TASK_SW()                             OSCtxSw() /* Simulate interrupt                          */
+
+/*
+*********************************************************************************************************
+*                                       TIMESTAMP CONFIGURATION
+*
+* Note(s) : (1) OS_TS_GET() is generally defined as CPU_TS_Get32() to allow CPU timestamp timer to be of
+*               any data type size.
+*
+*           (2) For architectures that provide 32-bit or higher precision free running counters 
+*               (i.e. cycle count registers):
+*
+*               (a) OS_TS_GET() may be defined as CPU_TS_TmrRd() to improve performance when retrieving
+*                   the timestamp.  You would use CPU_TS_TmrRd() if this function returned the value of 
+*                   a 32-bit free running timer 0x00000000 to 0xFFFFFFFF then roll over to 0x00000000.
+*
+*               (b) CPU_TS_TmrRd() MUST be configured to be greater or equal to 32-bits to avoid
+*                   truncation of TS.
+*
+*               (c) The Timer must be an up counter.
+*********************************************************************************************************
+*/
+
+#if      OS_CFG_TS_EN == 1u
+#define  OS_TS_GET()               (CPU_TS)CPU_TS_Get32()   /* See Note #2a.   CPU_TS_TmrRd()                                       */
+#else
+#define  OS_TS_GET()               (CPU_TS)0u
+#endif
+
+
+/*
+*********************************************************************************************************
+*                                         FUNCTION PROTOTYPES
+*********************************************************************************************************
+*/
+
+void  OSCtxSw        (void);
+void  OSIntCtxSw     (void);
+void  OSStartHighRdy (void);
+int   OS_SysTickInit (void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif