io.h

来自「em86xx 完整启动程序,支持网络下载与串通下载」· C头文件 代码 · 共 64 行

/*****************************************
 Copyright (c) 2002-2004
 Sigma Designs, Inc. All Rights Reserved
 Proprietary and Confidential
 *****************************************/

/* This file is part of the boot loader */

/*
 * io.h
 *
 * Raw I/O 
 *
 * first revision by Ho Lee 10/31/2002
 */

#ifndef __BOOTLOADER_IO_H
#define __BOOTLOADER_IO_H

#define mb()            __asm__ __volatile__ ("" : : : "memory")

//
// RAW I/O
//

static __inline__ unsigned char __raw_readb(unsigned long addr)
{
    volatile unsigned char *ptr = (volatile unsigned char *) (addr);
    return *ptr;
}

static __inline__ unsigned short __raw_readw(unsigned long addr)
{
    volatile unsigned short *ptr = (volatile unsigned short *) (addr);
    return *ptr;
}

static __inline__ unsigned int __raw_readl(unsigned long addr)
{
    volatile unsigned int *ptr = (volatile unsigned int *) (addr);
    return *ptr;
}

static __inline__ void __raw_writeb(unsigned int data, unsigned long addr)
{
    volatile unsigned char *ptr = (volatile unsigned char *) (addr);
    *ptr = (unsigned char) data;
}

static __inline__ void __raw_writew(unsigned int data, unsigned long addr)
{
    volatile unsigned short *ptr = (volatile unsigned short *) (addr);
    *ptr = (unsigned short) data;
}

static __inline__ void __raw_writel(unsigned int data, unsigned long addr)
{
    volatile unsigned int *ptr = (volatile unsigned int *) (addr);
    *ptr = data;
}

#endif