nios2.h

nios中自定义指令集实现三角函数的软件部分。

#ifndef __NIOS2_H__
#define __NIOS2_H__

/******************************************************************************
*                                                                             *
* License Agreement                                                           *
*                                                                             *
* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
* All rights reserved.                                                        *
*                                                                             *
* Permission is hereby granted, free of charge, to any person obtaining a     *
* copy of this software and associated documentation files (the "Software"),  *
* to deal in the Software without restriction, including without limitation   *
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* and/or sell copies of the Software, and to permit persons to whom the       *
* Software is furnished to do so, subject to the following conditions:        *
*                                                                             *
* The above copyright notice and this permission notice shall be included in  *
* all copies or substantial portions of the Software.                         *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
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* DEALINGS IN THE SOFTWARE.                                                   *
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* This agreement shall be governed in all respects by the laws of the State   *
* of California and by the laws of the United States of America.              *
*                                                                             *
******************************************************************************/

/*
 * This header provides processor specific macros for accessing the Nios2
 * control registers.
 */

#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */

/*
 * Macros for accessing selected processor registers
 */

#define NIOS2_READ_ET(et) \
	do { __asm ("mov %0, et" : "=r" (et) ); } while (0)

#define NIOS2_WRITE_ET(et) \
	do { __asm volatile ("mov et, %z0" : : "rM" (et)); } while (0)

#define NIOS2_READ_SP(sp) \
	do { __asm ("mov %0, sp" : "=r" (sp) ); } while (0)

/*
 * Macros for useful processor instructions
 */

#define NIOS2_BREAK() \
	do { __asm volatile ("break"); } while (0)

#define NIOS2_REPORT_STACK_OVERFLOW() \
	do { __asm volatile("break 3"); } while (0)

/*
 * Macros for accessing the control registers.
 */

#define NIOS2_READ_STATUS(dest) \
	do { dest = __builtin_rdctl(0); } while (0)

#define NIOS2_WRITE_STATUS(src) \
	do { __builtin_wrctl(0, src); } while (0)

#define NIOS2_READ_ESTATUS(dest) \
	do { dest = __builtin_rdctl(1); } while (0)

#define NIOS2_READ_BSTATUS(dest) \
	do { dest = __builtin_rdctl(2); } while (0)

#define NIOS2_READ_IENABLE(dest) \
	do { dest = __builtin_rdctl(3); } while (0)

#define NIOS2_WRITE_IENABLE(src) \
	do { __builtin_wrctl(3, src); } while (0)

#define NIOS2_READ_IPENDING(dest) \
	do { dest = __builtin_rdctl(4); } while (0)

#define NIOS2_READ_CPUID(dest) \
	do { dest = __builtin_rdctl(5); } while (0)

/*
 * Values of bits within control registers
 */

#define NIOS2_STATUS   status
#define NIOS2_ESTATUS  estatus
#define NIOS2_BSTATUS  bstatus
#define NIOS2_IENABLE  ienable
#define NIOS2_IPENDING ipending
#define NIOS2_CPUID cpuid

#define NIOS2_STATUS_PIE_MSK  0x1
#define NIOS2_STATUS_PIE_OFST 0
#define NIOS2_STATUS_U_MSK    0x2
#define NIOS2_STATUS_U_OFST   1

#define NIOS2_NIRQ 32

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __NIOS2_H__ */