specific.c

来自「bootloader源代码」· C语言 代码 · 共 116 行

/*****************************************
 Copyright (c) 2001-2002 
 Sigma Designs, Inc. All Rights Reserved
 Proprietary and Confidential
 *****************************************/

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

#include "config.h" 

#ifdef SUPPORT_BOOT_FROM_CD

#include "specific.h"
#include "atapi.h"
#include "uart.h"

unsigned char ATA_READ_UCHAR (IOPORT port)
{
	unsigned char c;
	c = (unsigned char) *(volatile unsigned char * const)port;
	DELAY(10);
	return c;
}

void ATA_WRITE_UCHAR (IOPORT port, unsigned char data)
{
	*(volatile unsigned char * const)port = data;
	DELAY(10); 
}

unsigned short ATA_READ_USHORT (IOPORT port)
{
	unsigned short s;
	s = (unsigned short) *(volatile unsigned short * const)port;
	DELAY(10);
	return s;
}

void ATA_WRITE_USHORT (IOPORT port, unsigned short data)
{
	*(volatile unsigned short * const)port = data;
	DELAY(10);
}

unsigned long ATA_READ_ULONG	(IOPORT port)
{
	unsigned long ul;
	ul = (unsigned long) *(volatile unsigned long * const)port;
	DELAY(10);
	return ul;
}

void ATA_WRITE_ULONG	(IOPORT port, unsigned long data)
{
	*(volatile unsigned long * const)port = data;
	DELAY(10);
}

void ATA_READ_USHORT_STRING (IOPORT port, short *data, int len)
{
	while (len--) {
		*data++ = *(volatile unsigned short * const)port;
		DELAY(10);
	}
//	PrintUart("\r\n",4);
//	unsigned long *p;
//	p = (unsigned long *)data;
//	len = len / 2;
//	while (len--)
//	{
//		*p++ = *(volatile unsigned long * const)port;		
//	}
}

void ATA_WRITE_USHORT_STRING (IOPORT port, short *data, int len)
{
	while (len--) {
		*(volatile unsigned short * const)port = *data++;
		DELAY(10);
	}
//	unsigned long *p;
//	p = (unsigned long *)data;
//	len = len / 2;
//	while (len--)
//	{
//		*(volatile unsigned long * const)port = *p++;
//	}
}

void ATA_READ_ULONG_STRING (IOPORT port, long *data, int len)
{
	while (len--){
		*data++ = *(volatile unsigned long * const)port;
		DELAY(10);
	}
}

void ATA_WRITE_ULONG_STRING (IOPORT port, long *data, int len)
{
	while (len--) {
		*(volatile unsigned long * const)port = *data++;
		DELAY(10);
	}
}

#endif // SUPPORT_BOOT_FROM_CD

void DELAY (int us)
{
	// one loop is about 3 cycles
	// @150Mhz 50 loops are about 1 microsecond
	unsigned long i;
	for (i=0; i<50*us; i++);
}